/**
 * 洲华科技 - 数字工业·深空脉冲 主题样式
 * Brand Colors:
 * - 深空灰背�? #0D1117
 * - 极客�? #8B949E
 * - 脉冲�? #00D4FF
 * - 警示�? #FF8C00
 */

/* ============================================
   CSS 变量定义
   ============================================ */
:root {
    /* 品牌色彩 */
    --color-bg-primary: #0D1117;
    --color-bg-secondary: #161B22;
    --color-bg-tertiary: #21262D;
    --color-bg-glass: rgba(13, 17, 23, 0.8);
    
    --color-text-primary: #F0F6FC;
    --color-text-secondary: #8B949E;
    --color-text-tertiary: #484F58;
    
    /* 辅助色变量 - 用于统一替换硬编码值 */
    --color-grey-medium: #8B949E;
    --color-grey-dark: #4a5568;
    --color-blue-dark: #1a365d;
    --color-blue-medium: #2d5a87;
    --color-blue-deep: #0d47a1;
    
    --color-accent-primary: #00D4FF;
    --color-accent-secondary: #00A8CC;
    --color-accent-glow: rgba(0, 212, 255, 0.4);
    
    --color-cta: #FF8C00;
    --color-cta-hover: #FFA500;
    
    --color-border: #30363D;
    --color-border-light: #21262D;
    
    /* 字体 */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    --font-mono: 'SF Mono', 'Fira Code', Consolas, monospace;
    
    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    --spacing-4xl: 6rem;
    
    /* 布局 */
    --container-max: 1280px;
    --navbar-height: 72px;
    
    /* 动画 */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    --transition-bounce: 0.5s cubic-bezier(0.68, -0.55, 0.265, 1.55);
    
    /* 发光效果 */
    --glow-accent: 0 0 20px rgba(0, 212, 255, 0.5), 0 0 40px rgba(0, 212, 255, 0.3);
    --glow-cta: 0 0 20px rgba(255, 140, 0, 0.4);
}

/* ============================================
   重置与基础样式
   ============================================ */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    background-color: var(--color-bg-primary);
    color: var(--color-text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* 选择文本颜色 */
::selection {
    background: var(--color-accent-primary);
    color: var(--color-bg-primary);
}

/* 滚动条样�?*/
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-secondary);
}

/* ============================================
   导航�?
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--navbar-height);
    z-index: 1000;
    background: rgba(13, 17, 23, 0.7);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--color-border-light);
    transition: var(--transition-base);
}

.navbar.scrolled {
    background: rgba(13, 17, 23, 0.95);
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-primary);
    transition: var(--transition-base);
}

.logo:hover {
    color: var(--color-accent-primary);
}

.logo-icon {
    width: 40px;
    height: 40px;
    color: var(--color-accent-primary);
}

.logo-icon svg {
    width: 100%;
    height: 100%;
}

.logo-path {
    stroke-dasharray: 200;
    stroke-dashoffset: 200;
    animation: drawLogo 2s ease forwards;
}

@keyframes drawLogo {
    to { stroke-dashoffset: 0; }
}

.logo-dot {
    opacity: 0;
    animation: fadeIn 0.5s ease 1.5s forwards;
}

@keyframes fadeIn {
    to { opacity: 1; }
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: 0.05em;
}

/* 导航菜单 */
.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: 6px;
    transition: var(--transition-fast);
}

.nav-link:hover {
    color: var(--color-text-primary);
    background: var(--color-bg-tertiary);
}

.nav-link .dropdown-icon {
    transition: transform var(--transition-fast);
}

.nav-item:hover .dropdown-icon {
    transform: rotate(180deg);
}

.cta-nav {
    background: transparent;
    color: var(--color-text-primary) !important;
    border: 1px solid var(--color-text-secondary);
    margin-left: var(--spacing-sm);
}

.cta-nav:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--color-accent-primary);
    color: var(--color-accent-primary) !important;
}

/* 导航CTA按钮 - 光波环绕效果 */
.nav-item:last-child {
    position: relative;
}

.nav-item:last-child::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 8px;
    padding: 2px;
    background: linear-gradient(90deg, 
        transparent, 
        var(--color-accent-primary), 
        transparent
    );
    background-size: 200% 100%;
    animation: lightWave 3s linear infinite;
    opacity: 0;
    transition: opacity var(--transition-base);
    pointer-events: none;
}

.nav-item:last-child:hover::before {
    opacity: 0.6;
}

@keyframes lightWave {
    0% { background-position: 200% 0; }
    100% { background-position: -200% 0; }
}

/* 下拉菜单 */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%) translateY(10px);
    min-width: 280px;
    padding: var(--spacing-sm);
    background: var(--color-bg-glass);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.4);
}

.nav-item:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.dropdown-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-radius: 8px;
    transition: var(--transition-fast);
}

.dropdown-item:hover {
    background: var(--color-bg-tertiary);
}

.dropdown-icon-wrapper {
    font-size: 1.5rem;
    line-height: 1;
    font-family: "Segoe UI Emoji", "Apple Color Emoji", "Noto Color Emoji", sans-serif;
}

.dropdown-content {
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.dropdown-title {
    color: var(--color-text-primary);
    font-weight: 600;
    font-size: 0.9375rem;
}

.dropdown-desc {
    color: var(--color-text-secondary);
    font-size: 0.8125rem;
}

/* 移动端导航切�?*/
.nav-toggle {
    display: none;
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    color: var(--color-text-primary);
}

.hamburger {
    position: relative;
    width: 24px;
    height: 2px;
    background: currentColor;
    transition: var(--transition-base);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    left: 0;
    width: 100%;
    height: 2px;
    background: currentColor;
    transition: var(--transition-base);
}

.hamburger::before { top: -7px; }
.hamburger::after { top: 7px; }

.nav-toggle.active .hamburger {
    background: transparent;
}

.nav-toggle.active .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.nav-toggle.active .hamburger::after {
    top: 0;
    transform: rotate(-45deg);
}

/* ============================================
   3D 英雄区域 - 左右分栏布局
   ============================================ */
.hero-3d {
    position: relative;
    height: 100vh;
    min-height: 700px;
    overflow: visible;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
}

.hero-canvas-container {
    position: relative;
    width: 100%;
    height: 100%;
    z-index: 1;
    background: radial-gradient(ellipse at center, rgba(0, 212, 255, 0.05) 0%, transparent 70%);
    order: 2; /* 3D模型在右�?*/
}

.hero-canvas-container canvas {
    width: 100% !important;
    height: 100% !important;
    display: block;
}

/* 3D加载状�?*/
.hero-canvas-container.loading::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 40px;
    height: 40px;
    margin: -20px 0 0 -20px;
    border: 3px solid var(--color-border);
    border-top-color: var(--color-accent-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    z-index: 5;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 3D 热点 */
.hotspots-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 100;
    pointer-events: none;
}

.hotspot {
    position: absolute;
    left: var(--x);
    top: var(--y);
    width: 48px;
    height: 48px;
    pointer-events: auto;
    cursor: pointer;
    transform: translate(-50%, -50%);
    z-index: 100;
}

.hotspot-pulse {
    position: absolute;
    inset: -4px;
    border-radius: 50%;
    opacity: 0.3;
    animation: pulse 2s ease-out infinite;
}

.hotspot-core {
    position: absolute;
    inset: 10px;
    border-radius: 50%;
    transition: var(--transition-base);
}

/* 热点内图�?*/
.hotspot-core::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 50%;
    border: 2px solid rgba(255, 255, 255, 0.5);
    transform: scale(1.2);
    opacity: 0;
    transition: all var(--transition-base);
}

.hotspot:hover .hotspot-core::after,
.hotspot.active .hotspot-core::after {
    transform: scale(1.5);
    opacity: 1;
}

/* 不同类型热点的颜�?*/
.hotspot-energy .hotspot-core {
    background: var(--color-accent-primary);
    box-shadow: 0 0 15px rgba(0, 212, 255, 0.6);
}

.hotspot-mep .hotspot-core {
    background: var(--color-cta);
    box-shadow: 0 0 15px rgba(255, 140, 0, 0.6);
}

.hotspot-engineering .hotspot-core {
    background: var(--color-text-secondary);
    box-shadow: 0 0 15px rgba(139, 148, 158, 0.6);
}

/* Hover状�?*/
.hotspot:hover .hotspot-core,
.hotspot.active .hotspot-core {
    transform: scale(1.4);
}

.hotspot:hover .hotspot-pulse,
.hotspot.active .hotspot-pulse {
    animation-duration: 1s;
}

.hotspot-energy:hover .hotspot-pulse,
.hotspot-energy.active .hotspot-pulse {
    background: var(--color-accent-primary);
}

.hotspot-mep:hover .hotspot-pulse,
.hotspot-mep.active .hotspot-pulse {
    background: var(--color-cta);
}

.hotspot-engineering:hover .hotspot-pulse,
.hotspot-engineering.active .hotspot-pulse {
    background: #8B949E;
}

@keyframes pulse {
    0% { transform: scale(0.8); opacity: 0.6; }
    100% { transform: scale(2.2); opacity: 0; }
}

/* Tooltip基础样式 */
.hotspot-tooltip {
    position: absolute;
    min-width: 180px;
    max-width: 220px;
    padding: 14px 18px;
    background: rgba(13, 17, 23, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--color-accent-primary);
    border-radius: 12px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    box-shadow: 0 0 40px rgba(0, 212, 255, 0.4), 0 10px 30px rgba(0, 0, 0, 0.4);
    z-index: 1000;
    pointer-events: none;
}

/* Tooltip在左侧 */
.hotspot-tooltip.tooltip-left {
    right: 100%;
    top: 50%;
    left: auto;
    transform: translateY(-50%) translateX(-15px);
    margin-right: 10px;
}

.hotspot-tooltip.tooltip-left::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 100%;
    transform: translateY(-50%);
    border: 10px solid transparent;
    border-left-color: var(--color-accent-primary);
}

/* Tooltip在上方 */
.hotspot-tooltip.tooltip-top {
    bottom: 100%;
    left: 50%;
    top: auto;
    transform: translateX(-50%) translateY(-15px);
    margin-bottom: 10px;
}

.hotspot-tooltip.tooltip-top::after {
    content: '';
    position: absolute;
    top: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 10px solid transparent;
    border-top-color: var(--color-accent-primary);
}

/* Tooltip在下方 */
.hotspot-tooltip.tooltip-bottom {
    top: 100%;
    bottom: auto;
    left: 50%;
    transform: translateX(-50%) translateY(15px);
    margin-top: 10px;
}

.hotspot-tooltip.tooltip-bottom::after {
    content: '';
    position: absolute;
    top: auto;
    bottom: 100%;
    left: 50%;
    transform: translateX(-50%);
    border: 10px solid transparent;
    border-bottom-color: var(--color-accent-primary);
}

/* 显示状态 */
.hotspot:hover .hotspot-tooltip,
.hotspot.active .hotspot-tooltip {
    opacity: 1;
    visibility: visible;
}

.hotspot:hover .hotspot-tooltip.tooltip-left,
.hotspot.active .hotspot-tooltip.tooltip-left {
    transform: translateY(-50%) translateX(-20px);
}

.hotspot:hover .hotspot-tooltip.tooltip-top,
.hotspot.active .hotspot-tooltip.tooltip-top {
    transform: translateX(-50%) translateY(-20px);
}

.hotspot:hover .hotspot-tooltip.tooltip-bottom,
.hotspot.active .hotspot-tooltip.tooltip-bottom {
    transform: translateX(-50%) translateY(20px);
}

.hotspot-tooltip h4 {
    font-size: 1rem;
    font-weight: 700;
    color: #ffffff;
    margin-bottom: 8px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
    white-space: nowrap;
}

.hotspot-tooltip p {
    font-size: 0.8125rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: 10px;
    line-height: 1.5;
}

.tooltip-cta {
    font-size: 0.8125rem;
    color: var(--color-accent-primary);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 4px;
    transition: all 0.3s;
}

/* 英雄文案 - 左栏布局 */
.hero-content {
    position: relative;
    z-index: 20;
    text-align: left;
    max-width: 600px;
    padding: 0 var(--spacing-xl);
    padding-left: var(--spacing-2xl);
    order: 1; /* 文字在左侧 */
}

.hero-content .hero-tag {
    justify-content: flex-start;
}

.hero-content .hero-actions {
    justify-content: flex-start;
}

.hero-tag {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.tag-line {
    width: 40px;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-accent-primary));
}

.tag-text {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-accent-primary);
    letter-spacing: 0.1em;
    text-transform: uppercase;
}

.hero-title {
    font-size: clamp(2.5rem, 8vw, 5rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--spacing-lg);
}

.title-line {
    display: block;
    position: relative;
}

.title-line.highlight {
    background: linear-gradient(135deg, var(--color-accent-primary) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
    filter: drop-shadow(0 0 30px rgba(0, 212, 255, 0.3)) 
            drop-shadow(0 0 60px rgba(0, 212, 255, 0.15))
            drop-shadow(0 4px 8px rgba(0, 0, 0, 0.5));
}

.title-line.highlight::before {
    content: attr(data-text);
    position: absolute;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-accent-primary) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: blur(20px);
    opacity: 0.4;
    z-index: -1;
    pointer-events: none;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.8;
}

.hero-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    flex-wrap: wrap;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 0.9375rem;
    font-weight: 600;
    border-radius: 8px;
    transition: all var(--transition-base);
}

.btn-primary {
    background: var(--color-accent-primary);
    color: var(--color-bg-primary);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent, 
        rgba(255, 255, 255, 0.3), 
        transparent
    );
    animation: shimmer 3s infinite;
}

@keyframes shimmer {
    0%, 100% { left: -100%; }
    50% { left: 100%; }
}

.btn-primary:hover {
    background: var(--color-accent-secondary);
    box-shadow: var(--glow-accent);
    transform: translateY(-2px);
}

.btn-secondary {
    background: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--color-text-secondary);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--color-accent-primary);
    color: var(--color-accent-primary);
}

/* 滚动指示�?- 页面底部中央 */
.scroll-indicator {
    position: absolute;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    z-index: 20;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}

.scroll-mouse {
    width: 24px;
    height: 38px;
    border: 2px solid var(--color-text-secondary);
    border-radius: 12px;
    display: flex;
    justify-content: center;
    padding-top: 8px;
}

.scroll-wheel {
    width: 4px;
    height: 8px;
    background: var(--color-accent-primary);
    border-radius: 2px;
    animation: scrollWheel 2s infinite;
}

@keyframes scrollWheel {
    0% { transform: translateY(0); opacity: 1; }
    100% { transform: translateY(12px); opacity: 0; }
}

.scroll-text {
    font-size: 0.75rem;
    color: var(--color-text-secondary);
    letter-spacing: 0.05em;
}

/* 3D 控制面板 - 重新设计 */
.scene-controls-wrapper {
    position: absolute;
    left: 50%;
    bottom: 8rem;
    transform: translateX(-50%);
    z-index: 20;
    display: flex;
    flex-direction: row;
    gap: var(--spacing-md);
    background: var(--color-bg-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--color-border);
    border-radius: 50px;
    padding: 0.5rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
}

.control-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.125rem;
    background: transparent;
    border: none;
    border-radius: 50px;
    color: var(--color-text-secondary);
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.control-btn svg {
    flex-shrink: 0;
}

.control-btn:hover {
    background: var(--color-bg-tertiary);
    color: var(--color-accent-primary);
}

.control-btn.active {
    background: var(--color-accent-primary);
    color: var(--color-bg-primary);
}

/* ============================================
   跳过链接 - 无障�?
   ============================================ */
.skip-link {
    position: absolute;
    top: -100%;
    left: 50%;
    transform: translateX(-50%);
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--color-accent-primary);
    color: var(--color-bg-primary);
    font-weight: 600;
    z-index: 10000;
    border-radius: 0 0 8px 8px;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 0;
}

/* Hero降级内容 */
.hero-fallback {
    position: absolute;
    inset: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.3;
}

.fallback-svg {
    width: 80%;
    max-width: 800px;
    height: auto;
}

/* ============================================
   问题洞察区域
   ============================================ */
.problem-section {
    padding: var(--spacing-4xl) 0;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
}

.section-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

.problem-content {
    text-align: center;
}

.problem-statement {
    max-width: 700px;
    margin: 0 auto var(--spacing-3xl);
}

.problem-text {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
}

.problem-text strong {
    color: var(--color-text-primary);
    font-weight: 600;
}

.problem-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-top: var(--spacing-3xl);
}

.problem-card {
    padding: var(--spacing-2xl);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    text-align: center;
    transition: var(--transition-base);
}

.problem-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent-primary);
    box-shadow: 0 20px 40px rgba(0, 212, 255, 0.1);
}

.problem-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-lg);
    color: var(--color-accent-primary);
}

.problem-icon svg {
    width: 100%;
    height: 100%;
}

.problem-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.problem-card p {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ============================================
   叙事滚动区域
   ============================================ */
.narrative-section {
    position: relative;
    padding: var(--spacing-4xl) 0;
}

.section-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 3px;
    height: 0%;
    background: linear-gradient(180deg, var(--color-accent-primary), transparent);
    z-index: 100;
    transition: height 0.1s linear;
}

.narrative-chapter {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
    align-items: center;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: var(--spacing-4xl) var(--spacing-xl);
    min-height: 80vh;
}

.narrative-chapter:nth-child(even) .chapter-visual {
    order: 2;
}

.chapter-visual {
    position: relative;
}

.visual-frame {
    position: relative;
    aspect-ratio: 4/3;
    background: var(--color-bg-secondary);
    border-radius: 20px;
    overflow: hidden;
    border: 1px solid var(--color-border);
}

/* CAD 网格背景 */
.cad-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(var(--color-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
    background-size: 40px 40px;
    opacity: 0.3;
}

/* 蓝图线条 */
.blueprint-lines {
    position: absolute;
    inset: 20%;
}

.bp-line {
    position: absolute;
    background: var(--color-accent-primary);
    opacity: 0.5;
}

.bp-line.bp-h {
    height: 1px;
    width: 100%;
}

.bp-line.bp-h:nth-child(1) { top: 0; }
.bp-line.bp-h:nth-child(2) { bottom: 0; }

.bp-line.bp-v {
    width: 1px;
    height: 100%;
}

.bp-line.bp-v:nth-child(3) { left: 0; }
.bp-line.bp-v:nth-child(4) { right: 0; }

/* 浮动元素 */
.floating-elements {
    position: absolute;
    inset: 10%;
}

.float-el {
    position: absolute;
    width: 80px;
    height: 80px;
    animation: float 6s ease-in-out infinite;
    animation-delay: var(--delay);
}

.float-el:nth-child(1) { top: 10%; left: 15%; }
.float-el:nth-child(2) { top: 50%; left: 60%; }
.float-el:nth-child(3) { top: 70%; left: 25%; }

@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(5deg); }
}

.arch-icon {
    width: 100%;
    height: 100%;
    color: var(--color-accent-primary);
    filter: drop-shadow(0 0 10px var(--color-accent-glow));
}

/* MEP 可视�?*/
.mep-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.mep-system {
    position: relative;
    width: 200px;
    height: 200px;
}

.pipe-system {
    position: absolute;
    inset: 0;
}

.pipe {
    position: absolute;
    background: var(--color-accent-primary);
    box-shadow: 0 0 10px var(--color-accent-glow);
    animation: pipePulse 3s ease-in-out infinite;
    animation-delay: var(--delay);
}

.pipe-h {
    height: 4px;
    left: 10%;
    right: 10%;
}

.pipe-h:nth-child(1) { top: 25%; }
.pipe-h:nth-child(3) { top: 75%; }

.pipe-v {
    width: 4px;
    top: 10%;
    bottom: 10%;
}

.pipe-v:nth-child(2) { left: 25%; }
.pipe-v:nth-child(4) { left: 75%; }

@keyframes pipePulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; box-shadow: 0 0 20px var(--color-accent-primary); }
}

.system-nodes {
    position: absolute;
    inset: 0;
}

.node {
    position: absolute;
    width: 20px;
    height: 20px;
}

.node:nth-child(1) { top: 20%; left: 20%; }
.node:nth-child(2) { top: 20%; left: 70%; }
.node:nth-child(3) { top: 70%; left: 45%; }

.node-core {
    position: absolute;
    inset: 0;
    background: var(--color-accent-primary);
    border-radius: 50%;
    box-shadow: 0 0 15px var(--color-accent-glow);
}

.node-ring {
    position: absolute;
    inset: -10px;
    border: 2px solid var(--color-accent-primary);
    border-radius: 50%;
    opacity: 0;
    animation: nodeRing 2s ease-out infinite;
    animation-delay: var(--delay);
}

@keyframes nodeRing {
    0% { transform: scale(0.8); opacity: 1; }
    100% { transform: scale(1.5); opacity: 0; }
}

.data-flow {
    position: absolute;
    inset: 0;
}

.flow-particle {
    position: absolute;
    width: 8px;
    height: 8px;
    background: var(--color-cta);
    border-radius: 50%;
    box-shadow: 0 0 10px var(--color-cta);
    animation: flowMove 3s linear infinite;
    animation-delay: var(--delay);
}

@keyframes flowMove {
    0% { top: 25%; left: 10%; opacity: 0; }
    10% { opacity: 1; }
    45% { top: 25%; left: 90%; }
    50% { top: 75%; left: 90%; }
    95% { top: 75%; left: 10%; opacity: 1; }
    100% { top: 75%; left: 10%; opacity: 0; }
}

/* 能源可视�?*/
.energy-visual {
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

.sun-core {
    position: absolute;
    width: 100px;
    height: 100px;
    top: 15%;
    right: 15%;
}

.sun-inner {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle, var(--color-cta) 0%, transparent 70%);
    border-radius: 50%;
    animation: sunPulse 3s ease-in-out infinite;
}

@keyframes sunPulse {
    0%, 100% { transform: scale(1); opacity: 0.8; }
    50% { transform: scale(1.1); opacity: 1; }
}

.sun-rays {
    position: absolute;
    inset: -50%;
    animation: sunRotate 20s linear infinite;
}

@keyframes sunRotate {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

.ray {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 2px;
    height: 100%;
    background: linear-gradient(180deg, var(--color-cta), transparent);
    transform-origin: center;
    transform: translate(-50%, -50%) rotate(var(--angle));
    opacity: 0.3;
}

.energy-panels {
    position: absolute;
    bottom: 20%;
    left: 15%;
    display: flex;
    gap: 10px;
    transform: perspective(500px) rotateX(20deg);
}

.panel {
    width: 60px;
    height: 80px;
    position: relative;
}

.panel-surface {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #1a365d, #2d5a87);
    border: 2px solid var(--color-accent-primary);
    transform: skewX(-10deg);
    animation: panelGlow 4s ease-in-out infinite;
    animation-delay: calc(var(--i) * 0.3s);
}

@keyframes panelGlow {
    0%, 100% { box-shadow: 0 0 5px var(--color-accent-glow); }
    50% { box-shadow: 0 0 20px var(--color-accent-primary); }
}

.energy-particles {
    position: absolute;
    inset: 0;
}

.e-particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--color-cta);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--color-cta);
    animation: energyFloat 4s ease-in-out infinite;
    animation-delay: var(--delay);
}

.e-particle:nth-child(1) { top: 30%; left: 20%; }
.e-particle:nth-child(2) { top: 50%; left: 60%; }
.e-particle:nth-child(3) { top: 70%; left: 40%; }
.e-particle:nth-child(4) { top: 40%; left: 80%; }

@keyframes energyFloat {
    0%, 100% { transform: translateY(0); opacity: 0.3; }
    50% { transform: translateY(-30px); opacity: 1; }
}

/* 章节内容 */
.chapter-content {
    padding: var(--spacing-xl);
}

.chapter-number {
    font-family: var(--font-mono);
    font-size: 5rem;
    font-weight: 800;
    color: transparent;
    -webkit-text-stroke: 1px var(--color-border);
    line-height: 1;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.chapter-title {
    font-size: clamp(2rem, 4vw, 3rem);
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
}

.title-primary {
    display: block;
    color: var(--color-text-primary);
}

.title-secondary {
    display: block;
    color: var(--color-accent-primary);
}

.chapter-intro {
    font-size: 1.125rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--color-border);
}

.chapter-problems {
    margin-bottom: var(--spacing-xl);
}

.chapter-problems h4,
.chapter-capabilities h4,
.chapter-value h4,
.delivery-flow h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: var(--spacing-md);
}

.chapter-problems ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.chapter-problems li {
    position: relative;
    padding-left: var(--spacing-lg);
    color: var(--color-text-secondary);
    font-size: 0.9375rem;
}

.chapter-problems li::before {
    content: '×';
    position: absolute;
    left: 0;
    color: #f85149;
    font-weight: 600;
}

.chapter-capabilities {
    margin-bottom: var(--spacing-xl);
}

.chapter-value {
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: rgba(0, 212, 255, 0.05);
    border-left: 3px solid var(--color-accent-primary);
    border-radius: 0 8px 8px 0;
}

.value-text {
    font-size: 1rem;
    color: var(--color-text-primary);
    font-style: italic;
    line-height: 1.6;
}

.delivery-flow {
    margin-bottom: var(--spacing-xl);
}

.flow-steps {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.flow-step {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.step-dot {
    width: 8px;
    height: 8px;
    background: var(--color-accent-primary);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--color-accent-glow);
}

.step-label {
    font-size: 0.875rem;
    color: var(--color-text-primary);
    font-weight: 500;
}

.flow-arrow {
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
}

.chapter-desc {
    font-size: 1.0625rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-xl);
}

.feature-list {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.feature-list li {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-primary);
    font-size: 0.9375rem;
}

.feature-icon {
    font-size: 1.25rem;
}

.chapter-link {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-accent-primary);
    font-weight: 600;
    font-size: 0.9375rem;
    transition: var(--transition-fast);
}

.chapter-link:hover {
    gap: var(--spacing-md);
    text-shadow: 0 0 10px var(--color-accent-glow);
}

.chapter-link svg {
    transition: transform var(--transition-fast);
}

.chapter-link:hover svg {
    transform: translateX(4px);
}

/* ============================================
   数据统计区域
   ============================================ */
.stats-section {
    padding: var(--spacing-4xl) 0;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
    border-bottom: 1px solid var(--color-border);
}

.stats-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

.section-header {
    margin-bottom: var(--spacing-3xl);
}

.section-header.centered {
    text-align: center;
}

.section-tag {
    display: inline-block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-accent-primary);
    letter-spacing: 0.1em;
    text-transform: uppercase;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--color-text-primary);
}

.section-subtitle {
    font-size: 1.0625rem;
    color: var(--color-text-secondary);
    margin-top: var(--spacing-sm);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
}

.stat-card {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-xl);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    transition: var(--transition-base);
}

.stat-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent-primary);
    box-shadow: 0 20px 40px rgba(0, 212, 255, 0.1);
}

.stat-icon {
    width: 48px;
    height: 48px;
    margin: 0 auto var(--spacing-md);
    color: var(--color-accent-primary);
}

.stat-icon svg {
    width: 100%;
    height: 100%;
}

.stat-value {
    font-size: 3rem;
    font-weight: 800;
    color: var(--color-text-primary);
    line-height: 1;
    margin-bottom: var(--spacing-sm);
}

.stat-value span {
    background: linear-gradient(135deg, var(--color-accent-primary), var(--color-cta));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.stat-label {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
}

/* ============================================
   项目案例预览
   ============================================ */
.projects-preview {
    padding: var(--spacing-4xl) 0;
}

.projects-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

.projects-preview .section-header {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.view-all {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--color-accent-primary);
    font-size: 0.9375rem;
    font-weight: 500;
    transition: var(--transition-fast);
}

.view-all:hover {
    gap: var(--spacing-sm);
}

.view-all svg {
    transition: transform var(--transition-fast);
}

.view-all:hover svg {
    transform: translateX(4px);
}

.projects-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: var(--spacing-xl);
}

.project-card {
    position: relative;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    overflow: hidden;
    transition: var(--transition-base);
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent-primary);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
}

.project-card.featured {
    grid-row: span 1;
}

.project-image {
    position: relative;
    aspect-ratio: 16/10;
    overflow: hidden;
}

.project-placeholder {
    width: 100%;
    height: 100%;
    background: var(--bg-gradient);
    display: flex;
    align-items: center;
    justify-content: center;
}

.placeholder-content {
    text-align: center;
    color: rgba(255, 255, 255, 0.9);
}

.building-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-sm);
    opacity: 0.8;
}

.placeholder-content span {
    font-size: 0.875rem;
    font-weight: 500;
}

.project-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 0%, var(--color-bg-secondary) 100%);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.project-card:hover .project-overlay {
    opacity: 1;
}

.project-info {
    padding: var(--spacing-lg);
}

.project-tags {
    display: flex;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-sm);
    flex-wrap: wrap;
}

.tag {
    padding: 4px 10px;
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-size: 0.75rem;
    color: var(--color-text-secondary);
}

.project-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.project-desc {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-md);
}

.project-link {
    font-size: 0.875rem;
    color: var(--color-accent-primary);
    font-weight: 500;
}

/* ============================================
   技术展示区�?
   ============================================ */
.tech-showcase {
    padding: var(--spacing-4xl) 0;
    background: var(--color-bg-secondary);
}

.tech-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

.tech-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    margin-top: var(--spacing-3xl);
}

.tech-card {
    padding: var(--spacing-2xl);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    text-align: center;
    transition: var(--transition-base);
}

.tech-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent-primary);
    box-shadow: 0 20px 40px rgba(0, 212, 255, 0.1);
}

.tech-icon {
    position: relative;
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-accent-primary);
}

.tech-icon svg {
    width: 48px;
    height: 48px;
    position: relative;
    z-index: 1;
}

.icon-glow {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle, var(--color-accent-glow) 0%, transparent 70%);
    opacity: 0.5;
    animation: iconGlow 3s ease-in-out infinite;
}

@keyframes iconGlow {
    0%, 100% { transform: scale(1); opacity: 0.5; }
    50% { transform: scale(1.1); opacity: 0.8; }
}

.tech-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.tech-desc {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.tech-link {
    font-size: 0.875rem;
    color: var(--color-accent-primary);
    font-weight: 500;
    transition: var(--transition-fast);
}

.tech-link:hover {
    text-shadow: 0 0 10px var(--color-accent-glow);
}

/* ============================================
   CTA 区域
   ============================================ */
.cta-section {
    padding: var(--spacing-4xl) 0;
    position: relative;
    overflow: hidden;
}

.cta-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-4xl);
    align-items: center;
}

.cta-content {
    position: relative;
    z-index: 1;
}

.cta-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.cta-desc {
    font-size: 1.0625rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

.cta-actions {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.btn-cta-primary {
    background: var(--color-cta);
    color: var(--color-bg-primary);
}

.btn-cta-primary:hover {
    background: var(--color-cta-hover);
    box-shadow: var(--glow-cta);
    transform: translateY(-2px);
}

.btn-cta-secondary {
    background: transparent;
    color: #ffffff;
    border: 1px solid rgba(255, 255, 255, 0.6);
}

.btn-cta-secondary:hover {
    background: #ffffff;
    color: var(--color-bg-primary);
    border-color: #ffffff;
}

/* CTA 装饰 */
.cta-decoration {
    position: relative;
    height: 300px;
}

.deco-circle {
    position: absolute;
    width: 200px;
    height: 200px;
    border: 2px solid var(--color-accent-primary);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.3;
    animation: decoPulse 4s ease-in-out infinite;
}

.deco-ring {
    position: absolute;
    width: 280px;
    height: 280px;
    border: 1px dashed var(--color-accent-primary);
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.2;
    animation: decoRotate 20s linear infinite;
}

@keyframes decoPulse {
    0%, 100% { transform: translate(-50%, -50%) scale(1); }
    50% { transform: translate(-50%, -50%) scale(1.1); }
}

@keyframes decoRotate {
    from { transform: translate(-50%, -50%) rotate(0deg); }
    to { transform: translate(-50%, -50%) rotate(360deg); }
}

.deco-dots {
    position: absolute;
    inset: 0;
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 60px;
    place-items: center;
}

.deco-dots span {
    width: 6px;
    height: 6px;
    background: var(--color-accent-primary);
    border-radius: 50%;
    opacity: 0.4;
}

/* ============================================
   合作伙伴区域
   ============================================ */
.partners-section {
    padding: var(--spacing-4xl) 0;
    background: var(--color-bg-primary);
    border-top: 1px solid var(--color-border);
}

.partners-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

.partners-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.partners-title {
    font-size: clamp(1.75rem, 3vw, 2.5rem);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.partners-desc {
    font-size: 1rem;
    color: var(--color-text-secondary);
    max-width: 500px;
    margin: 0 auto;
}

.partners-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
}

.partner-logo {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: var(--spacing-xl);
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    transition: all 0.3s ease;
}

.partner-logo:hover {
    border-color: var(--color-accent-primary);
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 212, 255, 0.1);
}

.logo-placeholder {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    font-family: "Segoe UI Emoji", "Apple Color Emoji", "Noto Color Emoji", sans-serif;
}

.partner-logo span {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    font-weight: 500;
}

@media (max-width: 1024px) {
    .partners-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

@media (max-width: 768px) {
    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-md);
    }
    
    .partner-logo {
        padding: var(--spacing-md);
    }
    
    .logo-placeholder {
        font-size: 2rem;
    }
}

/* ============================================
   页脚
   ============================================ */
.footer {
    padding: var(--spacing-4xl) 0 0;
    background: var(--color-bg-secondary);
    border-top: 1px solid var(--color-border);
}

.footer-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

.footer-main {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: var(--spacing-4xl);
    padding-bottom: var(--spacing-3xl);
    border-bottom: 1px solid var(--color-border);
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.footer-logo .logo-icon {
    width: 36px;
    height: 36px;
    color: var(--color-accent-primary);
}

.footer-slogan {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

.footer-contact {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--color-text-secondary);
    font-size: 0.875rem;
}

.contact-item svg {
    color: var(--color-accent-primary);
    flex-shrink: 0;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
}

.column-title {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-lg);
}

.link-column ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.link-column a {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    transition: var(--transition-fast);
}

.link-column a:hover {
    color: var(--color-accent-primary);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-xl) 0;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.copyright {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
}

.footer-legal {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-legal a {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    transition: var(--transition-fast);
}

.footer-legal a:hover {
    color: var(--color-accent-primary);
}

/* ============================================
   返回顶部按钮
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-bg-glass);
    backdrop-filter: blur(10px);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    color: var(--color-text-secondary);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-base);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--color-accent-primary);
    color: var(--color-bg-primary);
    border-color: var(--color-accent-primary);
}

/* ============================================
   响应式设�?
   ============================================ */
@media (max-width: 1024px) {
    /* Hero区域响应�?- 恢复上下布局 */
    .hero-3d {
        grid-template-columns: 1fr;
        grid-template-rows: auto 1fr;
    }
    
    .hero-content {
        order: 1;
        text-align: center;
        padding: calc(var(--navbar-height) + var(--spacing-xl)) var(--spacing-xl) var(--spacing-xl);
        max-width: 100%;
    }
    
    .hero-content .hero-tag {
        justify-content: center;
    }
    
    .hero-canvas-container {
        order: 2;
        min-height: 50vh;
    }
    
    .hotspots-container {
        width: 100%;
        left: 0;
        right: 0;
    }
    
    /* 平板端：tooltip改为下方显示 */
    .hotspot-tooltip.tooltip-left {
        right: auto;
        left: 50%;
        top: 100%;
        transform: translateX(-50%) translateY(10px);
        margin-right: 0;
        margin-top: 10px;
    }
    
    .hotspot-tooltip.tooltip-left::after {
        left: 50%;
        top: auto;
        bottom: 100%;
        transform: translateX(-50%);
        border: 10px solid transparent;
        border-bottom-color: var(--color-accent-primary);
        border-left-color: transparent;
    }
    
    .hotspot:hover .hotspot-tooltip.tooltip-left,
    .hotspot.active .hotspot-tooltip.tooltip-left {
        transform: translateX(-50%) translateY(15px);
    }
    
    .scene-controls-wrapper {
        left: 50%;
        right: auto;
        bottom: 7rem;
        gap: 0.25rem;
        padding: 0.375rem;
    }
    
    .control-btn {
        padding: 0.5rem 0.875rem;
        font-size: 0.75rem;
    }
    
    .problem-cards {
        grid-template-columns: 1fr;
    }
    
    .flow-steps {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .flow-arrow {
        transform: rotate(90deg);
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-menu {
        position: fixed;
        top: var(--navbar-height);
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--color-bg-primary);
        flex-direction: column;
        padding: var(--spacing-xl);
        gap: var(--spacing-sm);
        opacity: 0;
        visibility: hidden;
        transform: translateY(-10px);
        transition: all var(--transition-base);
    }
    
    .nav-menu.active {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }
    
    .nav-item {
        width: 100%;
    }
    
    .nav-link {
        padding: var(--spacing-md);
        font-size: 1.125rem;
    }
    
    .dropdown-menu {
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
        background: transparent;
        backdrop-filter: none;
        border: none;
        box-shadow: none;
        padding: var(--spacing-sm) 0;
        min-width: auto;
    }
    
    .dropdown-item {
        padding: var(--spacing-sm) var(--spacing-md);
    }
    
    .cta-nav {
        margin-left: 0;
        margin-top: var(--spacing-md);
    }
    
    .narrative-chapter {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .narrative-chapter:nth-child(even) .chapter-visual {
        order: 0;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .projects-grid {
        grid-template-columns: 1fr 1fr;
    }
    
    .project-card.featured {
        grid-column: span 2;
    }
    
    .tech-grid {
        grid-template-columns: 1fr;
    }
    
    .cta-container {
        grid-template-columns: 1fr;
    }
    
    .cta-decoration {
        display: none;
    }
    
    .footer-main {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .footer-links {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    :root {
        --navbar-height: 64px;
    }
    
    .hero-3d {
        min-height: auto;
    }
    
    .hero-content {
        padding: calc(var(--navbar-height) + var(--spacing-lg)) var(--spacing-md) var(--spacing-lg);
    }
    
    .hero-title {
        font-size: clamp(1.75rem, 6vw, 2.5rem);
    }
    
    .hero-canvas-container {
        min-height: 45vh;
    }
    
    .scene-controls-wrapper {
        bottom: 5rem;
        padding: 0.25rem;
    }
    
    /* 小屏幕：调整热点位置和tooltip大小 */
    .hotspots-container {
        display: block;
    }
    
    .hotspot {
        transform: translate(-50%, -50%) scale(0.8);
    }
    
    /* 小屏幕：tooltip改为上方显示，避免被底部遮挡 */
    .hotspot-tooltip.tooltip-left {
        right: auto;
        left: 50%;
        top: auto;
        bottom: 100%;
        transform: translateX(-50%) translateY(-10px);
        margin-right: 0;
        margin-bottom: 10px;
    }
    
    .hotspot-tooltip.tooltip-left::after {
        left: 50%;
        top: 100%;
        bottom: auto;
        transform: translateX(-50%);
        border: 8px solid transparent;
        border-top-color: var(--color-accent-primary);
        border-left-color: transparent;
    }
    
    .hotspot:hover .hotspot-tooltip.tooltip-left,
    .hotspot.active .hotspot-tooltip.tooltip-left {
        transform: translateX(-50%) translateY(-15px);
    }
    
    .hotspot-tooltip {
        min-width: 150px;
        max-width: 180px;
        padding: 10px 12px;
    }
    
    .hotspot-tooltip h4 {
        font-size: 0.875rem;
        margin-bottom: 4px;
    }
    
    .hotspot-tooltip p {
        font-size: 0.75rem;
        margin-bottom: 6px;
    }
    
    .tooltip-cta {
        font-size: 0.75rem;
    }
    
    .chapter-number {
        font-size: 3rem;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .projects-grid {
        grid-template-columns: 1fr;
    }
    
    .project-card.featured {
        grid-column: span 1;
    }
    
    .footer-links {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .back-to-top {
        right: var(--spacing-md);
        bottom: var(--spacing-md);
    }
}

/* ============================================
   无障碍支�?
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    html {
        scroll-behavior: auto;
    }
}

/* 焦点样式 */
a:focus-visible,
button:focus-visible {
    outline: 2px solid var(--color-accent-primary);
    outline-offset: 2px;
}

/* 高对比度模式支持 */
@media (prefers-contrast: high) {
    :root {
        --color-border: #666;
        --color-text-secondary: #ccc;
    }
}
/* ============================================
   图片懒加载样式
   ============================================ */

/* 图片容器 */
.img-wrapper {
    position: relative;
    overflow: hidden;
    border-radius: 12px;
    background: var(--color-bg-tertiary);
}

.img-wrapper::before {
    content: '';
    display: block;
    padding-top: 56.25%;  /* 16:9 比例 */
}

.img-wrapper img {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease, opacity 0.4s ease;
}

/* Hover 效果 */
.img-wrapper:hover img {
    transform: scale(1.05);
}

/* 图片覆盖层 */
.img-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(180deg, transparent 0%, rgba(13, 17, 23, 0.8) 100%);
    opacity: 0;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: var(--spacing-lg);
    transition: opacity 0.3s ease;
}

.img-wrapper:hover .img-overlay {
    opacity: 1;
}

.view-project {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--color-text-primary);
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--color-accent-primary);
    border-radius: 20px;
}

/* 懒加载状态 */
.lazy-img {
    opacity: 0;
    transition: opacity 0.4s ease;
}

.lazy-img.loaded {
    opacity: 1;
}

/* LQIP 加载中效果 */
.img-wrapper.loading {
    filter: blur(10px);
    transform: scale(1.02);
}

.img-wrapper.loaded {
    filter: blur(0);
    transform: scale(1);
    transition: filter 0.3s ease, transform 0.3s ease;
}

/* 骨架屏 loading 效果 */
.img-wrapper::after {
    content: '';
    position: absolute;
    inset: 0;
    background: linear-gradient(
        90deg,
        transparent 0%,
        rgba(255, 255, 255, 0.03) 50%,
        transparent 100%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s infinite;
    pointer-events: none;
}

@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.img-wrapper.loaded::after,
.img-wrapper.error::after {
    display: none;
}

/* 加载错误状态 */
.img-wrapper.error {
    background: var(--color-bg-secondary);
}

.img-wrapper.error::before {
    content: '图片加载失败';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--color-text-tertiary);
    font-size: 0.875rem;
}

/* ============================================
   解决方案页面样式
   ============================================ */

/* 解决方案Hero区域 */
.solution-hero {
    position: relative;
    min-height: 80vh;
    display: flex;
    align-items: center;
    padding: calc(var(--navbar-height) + var(--spacing-2xl)) 0 var(--spacing-2xl);
    overflow: hidden;
}

.solution-hero-bg {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.solution-hero-bg .cad-grid {
    position: absolute;
    inset: 0;
    background: 
        /* 中心区域为纯色背景，无网�?*/
        radial-gradient(ellipse at 30% 50%, 
            rgba(13, 17, 23, 0.98) 0%, 
            rgba(13, 17, 23, 0.98) 30%,
            transparent 70%
        ),
        /* 四周渐隐的网�?*/
        linear-gradient(var(--color-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
    background-size: 
        100% 100%,
        80px 80px,
        80px 80px;
    opacity: 0.15;
    mask-image: radial-gradient(ellipse at 30% 50%, 
        transparent 0%, 
        transparent 25%,
        black 60%
    );
    -webkit-mask-image: radial-gradient(ellipse at 30% 50%, 
        transparent 0%, 
        transparent 25%,
        black 60%
    );
}

.solution-hero-bg .blueprint-lines {
    position: absolute;
    inset: 15%;
}

.solution-hero-bg .floating-elements {
    position: absolute;
    inset: 10%;
    z-index: 0;
    pointer-events: none;
}

.solution-hero-bg .floating-elements .float-el {
    opacity: 0.4;
}

.solution-hero-content {
    position: relative;
    z-index: 2;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
    width: 100%;
}

.solution-hero .hero-tag {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

.solution-hero .hero-tag .tag-text {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-accent-primary);
    letter-spacing: 0.1em;
}

.solution-title {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-lg);
    color: var(--color-text-primary);
}

.solution-title .highlight {
    background: linear-gradient(90deg, #ffffff 0%, var(--color-accent-primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.3));
}

.solution-subtitle {
    font-size: 1.25rem;
    color: var(--color-text-secondary);
    max-width: 600px;
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
}

.solution-nav {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.solution-nav-link {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    transition: color var(--transition-fast);
}

.solution-nav-link:hover {
    color: var(--color-accent-primary);
}

.nav-separator {
    color: var(--color-border);
}

/* 解决方案页面通用部分 */
.solution-section {
    padding: var(--spacing-4xl) 0;
}

.solution-section.alt-bg {
    background: var(--color-bg-secondary);
}

.section-container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

.section-header {
    margin-bottom: var(--spacing-3xl);
}

.section-header.centered {
    text-align: center;
}

.section-desc {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-top: var(--spacing-sm);
    font-style: italic;
}

/* 问题卡片 */
.problems-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
}

.problems-grid.two-columns {
    grid-template-columns: repeat(2, 1fr);
}

.problem-card-large {
    padding: var(--spacing-2xl);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    transition: transform var(--transition-base), border-color var(--transition-base);
}

.problem-card-large:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent-primary);
}

.problem-card-large.featured {
    background: linear-gradient(135deg, var(--color-bg-tertiary) 0%, rgba(0, 212, 255, 0.05) 100%);
    border-color: var(--color-accent-primary);
}

.problem-number {
    font-family: var(--font-mono);
    font-size: 3rem;
    font-weight: 800;
    color: transparent;
    -webkit-text-stroke: 1px var(--color-border);
    line-height: 1;
    margin-bottom: var(--spacing-md);
    opacity: 0.5;
}

.problem-card-large h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.problem-card-large > p {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.problem-impact {
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.problem-impact .impact-label {
    display: block;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-accent-primary);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
}

.problem-impact ul {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
}

.problem-impact li {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    position: relative;
    padding-left: var(--spacing-md);
}

.problem-impact li::before {
    content: '�?;
    position: absolute;
    left: 0;
    color: var(--color-accent-primary);
}

.problem-stats {
    display: flex;
    gap: var(--spacing-xl);
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--color-border);
}

.stat-item {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.stat-num {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-accent-primary);
}

.stat-label {
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
}

.problem-icon-large {
    width: 64px;
    height: 64px;
    margin-bottom: var(--spacing-md);
    color: var(--color-accent-primary);
}

.problem-icon-large svg {
    width: 100%;
    height: 100%;
}

/* 能力展示 */
.capabilities-showcase {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-3xl);
}

.capability-main {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: var(--spacing-3xl);
    align-items: center;
    padding: var(--spacing-2xl);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    transition: border-color var(--transition-base);
}

.capability-main:hover {
    border-color: var(--color-accent-primary);
}

.capability-main:nth-child(even) {
    grid-template-columns: 2fr 1fr;
}

.capability-main:nth-child(even) .capability-visual {
    order: 2;
}

.capability-visual {
    display: flex;
    align-items: center;
    justify-content: center;
}

.capability-icon-large {
    width: 120px;
    height: 120px;
    color: var(--color-accent-primary);
}

.capability-icon-large svg {
    width: 100%;
    height: 100%;
}

.capability-content h3 {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.capability-content > p {
    font-size: 1rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-lg);
}

.capability-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
}

.feature-tag {
    padding: 6px 14px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-border);
    border-radius: 20px;
    font-size: 0.8125rem;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
}

.feature-tag:hover {
    border-color: var(--color-accent-primary);
    color: var(--color-accent-primary);
}

/* 交付流程 */
.delivery-flow-horizontal {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-xl);
    position: relative;
}

.delivery-step {
    text-align: center;
    position: relative;
}

.delivery-step .step-number {
    font-family: var(--font-mono);
    font-size: 2.5rem;
    font-weight: 800;
    color: transparent;
    -webkit-text-stroke: 1px var(--color-border);
    line-height: 1;
    margin-bottom: var(--spacing-md);
}

.delivery-step .step-icon {
    width: 64px;
    height: 64px;
    margin: 0 auto var(--spacing-md);
    color: var(--color-accent-primary);
}

.delivery-step .step-icon svg {
    width: 100%;
    height: 100%;
}

.delivery-step h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-sm);
}

.delivery-step p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

.step-connector {
    position: absolute;
    top: 60px;
    right: -50%;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, var(--color-border), var(--color-accent-primary), var(--color-border));
}

.delivery-step:last-child .step-connector {
    display: none;
}

/* EMC流程 */
.emc-flow {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-top: var(--spacing-lg);
    flex-wrap: wrap;
}

.emc-step {
    padding: 8px 16px;
    background: var(--color-bg-secondary);
    border: 1px solid var(--color-accent-primary);
    border-radius: 20px;
    font-size: 0.8125rem;
    color: var(--color-accent-primary);
}

.emc-arrow {
    color: var(--color-accent-primary);
}

/* 价值区�?*/
.value-section {
    text-align: center;
}

.value-content-centered {
    max-width: 800px;
    margin: 0 auto;
}

.value-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.3;
}

.value-desc {
    font-size: 1.0625rem;
    color: var(--color-text-secondary);
    line-height: 1.8;
    margin-bottom: var(--spacing-2xl);
}

.value-metrics {
    display: flex;
    justify-content: center;
    gap: var(--spacing-3xl);
    flex-wrap: wrap;
}

.metric-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
}

.metric-value {
    font-size: 2.5rem;
    font-weight: 800;
    background: linear-gradient(135deg, var(--color-accent-primary), var(--color-cta));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.metric-label {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
}

/* CTA区域 */
.solution-cta {
    padding: var(--spacing-4xl) 0;
    background: var(--color-bg-secondary);
    text-align: center;
}

.solution-cta-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 0 var(--spacing-xl);
}

.solution-cta h2 {
    font-size: clamp(1.5rem, 3vw, 2rem);
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

.solution-cta p {
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--spacing-xl);
}

/* 相关解决方案 */
.related-solutions {
    padding: var(--spacing-4xl) 0;
}

.solutions-grid-small {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-xl);
    max-width: 800px;
    margin: 0 auto;
}

.solution-card-link {
    display: block;
}

.solution-card-small {
    padding: var(--spacing-xl);
    background: var(--color-bg-tertiary);
    border: 1px solid var(--color-border);
    border-radius: 16px;
    transition: all var(--transition-base);
    position: relative;
}

.solution-card-small:hover {
    transform: translateY(-5px);
    border-color: var(--color-accent-primary);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.2);
}

.solution-card-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-md);
    font-family: "Segoe UI Emoji", "Apple Color Emoji", "Noto Color Emoji", sans-serif;
}

.solution-card-small h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-xs);
}

.solution-card-small p {
    font-size: 0.875rem;
    color: var(--color-text-secondary);
}

.card-arrow {
    position: absolute;
    right: var(--spacing-lg);
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.5rem;
    color: var(--color-accent-primary);
    opacity: 0;
    transition: opacity var(--transition-fast);
}

.solution-card-small:hover .card-arrow {
    opacity: 1;
}

/* MEP主题样式 */
.mep-theme .mep-tag .tag-text,
.mep-theme .mep-highlight {
    color: var(--color-cta);
}

.mep-theme .highlight {
    background: linear-gradient(135deg, var(--color-cta) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.mep-theme .section-tag.mep-tag {
    color: var(--color-cta);
}

.mep-card {
    background: linear-gradient(135deg, var(--color-bg-tertiary) 0%, rgba(255, 140, 0, 0.05) 100%);
}

.mep-card:hover {
    border-color: var(--color-cta);
}

.mep-icon {
    color: var(--color-cta);
}

.mep-feature {
    border-color: rgba(255, 140, 0, 0.3);
    color: var(--color-cta);
}

.mep-feature:hover {
    border-color: var(--color-cta);
    background: rgba(255, 140, 0, 0.1);
}

.mep-cta {
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, rgba(255, 140, 0, 0.05) 100%);
}

.mep-btn {
    background: var(--color-cta);
}

.mep-btn:hover {
    background: var(--color-cta-hover);
    box-shadow: var(--glow-cta);
}

.problem-card-large.featured.energy-card {
    background: linear-gradient(135deg, var(--color-bg-tertiary) 0%, rgba(0, 212, 255, 0.05) 100%);
}

/* Energy主题样式 */
.energy-theme .energy-tag .tag-text,
.energy-theme .energy-highlight {
    color: var(--color-accent-primary);
}

.energy-theme .highlight {
    background: linear-gradient(135deg, var(--color-accent-primary) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.energy-theme .section-tag.energy-tag {
    color: var(--color-accent-primary);
}

.energy-card {
    background: linear-gradient(135deg, var(--color-bg-tertiary) 0%, rgba(0, 212, 255, 0.05) 100%);
}

.energy-card:hover {
    border-color: var(--color-accent-primary);
}

.energy-num {
    -webkit-text-stroke-color: var(--color-accent-primary);
}

.energy-icon {
    color: var(--color-accent-primary);
}

.energy-icon-bg {
    color: var(--color-accent-primary);
}

.energy-feature {
    border-color: rgba(0, 212, 255, 0.3);
    color: var(--color-accent-primary);
}

.energy-feature:hover {
    border-color: var(--color-accent-primary);
    background: rgba(0, 212, 255, 0.1);
}

.energy-cap:hover {
    border-color: var(--color-accent-primary);
}

.energy-value {
    background: linear-gradient(180deg, var(--color-bg-primary) 0%, rgba(0, 212, 255, 0.03) 100%);
}

.energy-val {
    background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.energy-cta {
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, rgba(0, 212, 255, 0.05) 100%);
}

.energy-btn {
    background: var(--color-accent-primary);
}

/* Engineering主题样式 */
.engineering-theme .engineering-tag .tag-text,
.engineering-theme .engineering-highlight {
    color: var(--color-accent-primary);
}

.engineering-theme .highlight {
    background: linear-gradient(135deg, var(--color-accent-primary) 0%, var(--color-text-secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.engineering-theme .section-tag.engineering-tag {
    color: var(--color-accent-primary);
}

.engineering-card {
    background: linear-gradient(135deg, var(--color-bg-tertiary) 0%, rgba(0, 212, 255, 0.05) 100%);
}

.engineering-card:hover {
    border-color: var(--color-accent-primary);
}

.engineering-num {
    -webkit-text-stroke-color: var(--color-accent-primary);
}

.engineering-icon {
    color: var(--color-accent-primary);
}

.engineering-icon-bg {
    color: var(--color-accent-primary);
}

.engineering-feature {
    border-color: rgba(0, 212, 255, 0.3);
    color: var(--color-accent-primary);
}

.engineering-feature:hover {
    border-color: var(--color-accent-primary);
    background: rgba(0, 212, 255, 0.1);
}

.engineering-cap:hover {
    border-color: var(--color-accent-primary);
}

.engineering-value {
    background: linear-gradient(180deg, var(--color-bg-primary) 0%, rgba(0, 212, 255, 0.03) 100%);
}

.engineering-val {
    background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.engineering-cta {
    background: linear-gradient(135deg, var(--color-bg-secondary) 0%, rgba(0, 212, 255, 0.05) 100%);
}

.engineering-btn {
    background: var(--color-accent-primary);
}

.engineering-btn:hover {
    background: var(--color-accent-secondary);
    box-shadow: var(--glow-accent);
}

/* Engineering背景视觉效果 */
.engineering-bg {
    background: radial-gradient(ellipse at 70% 50%, rgba(0, 212, 255, 0.08) 0%, transparent 50%);
}

.engineering-bg .engineering-visual {
    position: absolute;
    right: 10%;
    top: 50%;
    transform: translateY(-50%);
    width: 350px;
    height: 350px;
    opacity: 0.4;
}

.engineering-bg .cad-grid {
    position: absolute;
    inset: 0;
    background-image: 
        linear-gradient(var(--color-border) 1px, transparent 1px),
        linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
    background-size: 40px 40px;
    opacity: 0.2;
}

.engineering-bg .blueprint-lines {
    position: absolute;
    inset: 20%;
}

.engineering-bg .bp-line {
    position: absolute;
    background: var(--color-accent-primary);
    opacity: 0.4;
}

.engineering-bg .bp-line.bp-h {
    height: 1px;
    width: 100%;
}

.engineering-bg .bp-line.bp-h:nth-child(1) { top: 0; }
.engineering-bg .bp-line.bp-h:nth-child(2) { bottom: 0; }

.engineering-bg .bp-line.bp-v {
    width: 1px;
    height: 100%;
}

.engineering-bg .bp-line.bp-v:nth-child(3) { left: 0; }
.engineering-bg .bp-line.bp-v:nth-child(4) { right: 0; }

.engineering-bg .floating-elements {
    position: absolute;
    inset: 10%;
}

.engineering-bg .float-el {
    position: absolute;
    width: 60px;
    height: 60px;
    animation: float 6s ease-in-out infinite;
    animation-delay: var(--delay);
}

.engineering-bg .float-el:nth-child(1) { top: 10%; left: 15%; }
.engineering-bg .float-el:nth-child(2) { top: 50%; left: 60%; }
.engineering-bg .float-el:nth-child(3) { top: 70%; left: 25%; }

.engineering-bg .arch-icon {
    width: 100%;
    height: 100%;
    color: var(--color-accent-primary);
    filter: drop-shadow(0 0 10px rgba(0, 212, 255, 0.3));
}

.engineering-bg .structure-lines {
    position: absolute;
    inset: 15%;
}

.engineering-bg .struct-line {
    position: absolute;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--color-accent-primary), transparent);
    opacity: 0;
    animation: structLineAnim 3s ease-in-out infinite;
    animation-delay: var(--delay);
}

.engineering-bg .struct-line:nth-child(1) {
    top: 30%;
    left: 10%;
    width: 80%;
}

.engineering-bg .struct-line:nth-child(2) {
    top: 50%;
    left: 5%;
    width: 90%;
}

.engineering-bg .struct-line:nth-child(3) {
    top: 70%;
    left: 15%;
    width: 70%;
}

@keyframes structLineAnim {
    0%, 100% { opacity: 0; transform: scaleX(0.8); }
    50% { opacity: 0.6; transform: scaleX(1); }
}

/* 紧凑交付流程 */
.delivery-flow-compact {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-2xl);
    flex-wrap: wrap;
}

.flow-step-compact {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.flow-step-compact .step-dot {
    width: 10px;
    height: 10px;
    background: var(--color-accent-primary);
    border-radius: 50%;
    box-shadow: 0 0 10px rgba(0, 212, 255, 0.5);
}

.flow-step-compact .step-label {
    font-size: 0.875rem;
    color: var(--color-text-primary);
    font-weight: 500;
}

/* MEP背景视觉效果 */
.mep-bg {
    background: radial-gradient(ellipse at 70% 50%, rgba(255, 140, 0, 0.08) 0%, transparent 50%);
}

.mep-bg .mep-system-visual {
    position: absolute;
    right: 10%;
    top: 50%;
    transform: translateY(-50%);
    width: 300px;
    height: 300px;
    opacity: 0.3;
}

.mep-bg .pipe-system {
    position: absolute;
    inset: 20%;
}

.mep-bg .pipe {
    position: absolute;
    background: var(--color-cta);
    box-shadow: 0 0 10px rgba(255, 140, 0, 0.5);
    animation: pipePulse 3s ease-in-out infinite;
    animation-delay: var(--delay);
}

.mep-bg .pipe-h {
    height: 3px;
    left: 10%;
    right: 10%;
}

.mep-bg .pipe-h:nth-child(1) { top: 25%; }
.mep-bg .pipe-h:nth-child(3) { top: 75%; }

.mep-bg .pipe-v {
    width: 3px;
    top: 10%;
    bottom: 10%;
}

.mep-bg .pipe-v:nth-child(2) { left: 25%; }
.mep-bg .pipe-v:nth-child(4) { left: 75%; }

.mep-bg .system-nodes {
    position: absolute;
    inset: 0;
}

.mep-bg .node {
    position: absolute;
    width: 16px;
    height: 16px;
}

.mep-bg .node:nth-child(1) { top: 20%; left: 20%; }
.mep-bg .node:nth-child(2) { top: 20%; left: 70%; }
.mep-bg .node:nth-child(3) { top: 70%; left: 45%; }

.mep-bg .node-core {
    position: absolute;
    inset: 0;
    background: var(--color-cta);
    border-radius: 50%;
    box-shadow: 0 0 15px rgba(255, 140, 0, 0.6);
}

.mep-bg .node-ring {
    position: absolute;
    inset: -8px;
    border: 2px solid var(--color-cta);
    border-radius: 50%;
    opacity: 0;
    animation: nodeRing 2s ease-out infinite;
    animation-delay: var(--delay);
}

.mep-bg .data-flow {
    position: absolute;
    inset: 0;
}

.mep-bg .flow-particle {
    position: absolute;
    width: 6px;
    height: 6px;
    background: var(--color-cta);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--color-cta);
    animation: flowMove 3s linear infinite;
    animation-delay: var(--delay);
}

/* Energy背景视觉效果 */
.energy-bg {
    background: radial-gradient(ellipse at 70% 30%, rgba(0, 212, 255, 0.1) 0%, transparent 50%);
}

.energy-bg .energy-visual {
    position: absolute;
    right: 15%;
    top: 20%;
    width: 250px;
    height: 350px;
    opacity: 0.4;
}

.energy-bg .sun-core {
    position: absolute;
    width: 80px;
    height: 80px;
    top: 0;
    right: 0;
}

.energy-bg .sun-inner {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle, var(--color-cta) 0%, transparent 70%);
    border-radius: 50%;
    animation: sunPulse 3s ease-in-out infinite;
}

.energy-bg .sun-rays {
    position: absolute;
    inset: -40%;
    animation: sunRotate 20s linear infinite;
}

.energy-bg .ray {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 2px;
    height: 100%;
    background: linear-gradient(180deg, var(--color-cta), transparent);
    transform-origin: center;
    transform: translate(-50%, -50%) rotate(var(--angle));
    opacity: 0.4;
}

.energy-bg .energy-panels {
    position: absolute;
    bottom: 10%;
    left: 0;
    display: flex;
    gap: 8px;
    transform: perspective(500px) rotateX(20deg);
}

.energy-bg .panel {
    width: 50px;
    height: 70px;
    position: relative;
}

.energy-bg .panel-surface {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #1a365d, #2d5a87);
    border: 2px solid var(--color-accent-primary);
    transform: skewX(-10deg);
    animation: panelGlow 4s ease-in-out infinite;
    animation-delay: calc(var(--i) * 0.3s);
}

.energy-bg .energy-particles {
    position: absolute;
    inset: 0;
}

.energy-bg .e-particle {
    position: absolute;
    width: 4px;
    height: 4px;
    background: var(--color-cta);
    border-radius: 50%;
    box-shadow: 0 0 8px var(--color-cta);
    animation: energyFloat 4s ease-in-out infinite;
    animation-delay: var(--delay);
}

.energy-bg .e-particle:nth-child(1) { top: 30%; left: 20%; }
.energy-bg .e-particle:nth-child(2) { top: 50%; left: 60%; }
.energy-bg .e-particle:nth-child(3) { top: 70%; left: 40%; }
.energy-bg .e-particle:nth-child(4) { top: 40%; left: 80%; }

/* 响应�?*/
@media (max-width: 1024px) {
    .solution-hero {
        min-height: 60vh;
    }
    
    .problems-grid,
    .problems-grid.two-columns {
        grid-template-columns: 1fr;
    }
    
    .capability-main,
    .capability-main:nth-child(even) {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .capability-main:nth-child(even) .capability-visual {
        order: 0;
    }
    
    .delivery-flow-horizontal {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }
    
    .step-connector {
        display: none;
    }
    
    .solutions-grid-small {
        grid-template-columns: 1fr;
    }
    
    .mep-bg .mep-system-visual,
    .energy-bg .energy-visual,
    .engineering-bg .engineering-visual {
        display: none;
    }
}

@media (max-width: 640px) {
    .solution-title {
        font-size: 2rem;
    }
    
    .value-metrics {
        gap: var(--spacing-xl);
    }
    
    .metric-value {
        font-size: 2rem;
    }
}