/* ================================================
   爱尚轩全屋定制 - 高端视觉设计系统 V2.0
   设计参考：苹果官网 + 华为/小米 + 欧派/索菲亚
   ================================================ */

/* ===== CSS设计系统核心变量 ===== */
:root {
    /* ========== 色彩系统（5级高级灰+黑金） ========== */
    /* 品牌主色 */
    --color-primary-900: #0f0f1a;    /* 最深色 */
    --color-primary-800: #1a1a2e;    /* 主深色 */
    --color-primary-700: #252542;    /* 次深色 */
    --color-primary-600: #2f2f55;    /* 中深色 */
    
    /* 金色系（轻奢） */
    --color-gold-500: #c9a962;       /* 主金色 */
    --color-gold-400: #d4bc7e;       /* 浅金色 */
    --color-gold-300: #dfcf9a;       /* 更浅金 */
    --color-gold-200: #e9e2b6;       /* 极浅金 */
    --color-gold-100: #f4f5d2;       /* 最浅金 */
    
    /* 5级高级灰色阶 */
    --color-gray-050: #fafbfc;       /* 极浅灰（背景） */
    --color-gray-100: #f5f7fa;       /* 浅灰（卡片背景） */
    --color-gray-200: #e4e7ed;       /* 边框灰 */
    --color-gray-300: #d0d3d9;       /* 浅分割线 */
    --color-gray-400: #a8abb2;       /* 次要文字 */
    --color-gray-500: #868a93;       /* 辅助文字 */
    --color-gray-600: #606266;       /* 常规文字 */
    --color-gray-700: #303133;       /* 主要文字 */
    --color-gray-800: #1e1e1e;       /* 标题文字 */
    --color-gray-900: #0a0a0a;       /* 纯黑文字 */
    
    /* 纯白 */
    --color-white: #ffffff;
    
    /* 功能色 */
    --color-success: #00b42a;
    --color-warning: #ff7d00;
    --color-danger: #f53f3f;
    --color-info: #165dff;
    
    /* ========== 间距系统（8px栅格） ========== */
    --spacing-01: 4px;    /* 0.5x */
    --spacing-02: 8px;    /* 1x */
    --spacing-03: 12px;   /* 1.5x */
    --spacing-04: 16px;   /* 2x */
    --spacing-05: 20px;   /* 2.5x */
    --spacing-06: 24px;   /* 3x */
    --spacing-08: 32px;   /* 4x */
    --spacing-10: 40px;   /* 5x */
    --spacing-12: 48px;   /* 6x */
    --spacing-15: 60px;   /* 7.5x */
    --spacing-20: 80px;   /* 10x */
    --spacing-25: 100px;  /* 12.5x */
    --spacing-30: 120px;  /* 15x */
    
    /* ========== 圆角系统 ========== */
    --radius-xs: 4px;
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-2xl: 24px;
    --radius-full: 9999px;
    
    /* ========== 阴影系统（多层次） ========== */
    --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.03);
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 12px 40px rgba(0, 0, 0, 0.15);
    --shadow-2xl: 0 20px 60px rgba(0, 0, 0, 0.2);
    --shadow-gold: 0 8px 30px rgba(201, 169, 98, 0.25);
    
    /* ========== 动画时间系统 ========== */
    --duration-fast: 150ms;
    --duration-normal: 300ms;
    --duration-slow: 500ms;
    --duration-slower: 800ms;
    
    /* ========== 字体系统（苹果/华为风格） ========== */
    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* 字体大小层级（H1 - H6） */
    --font-size-h1: clamp(40px, 5vw, 72px);
    --font-size-h2: clamp(32px, 4vw, 56px);
    --font-size-h3: clamp(28px, 3.5vw, 44px);
    --font-size-h4: clamp(24px, 3vw, 36px);
    --font-size-h5: clamp(20px, 2.5vw, 28px);
    --font-size-h6: clamp(18px, 2vw, 24px);
    
    /* 正文字号 */
    --font-size-xl: 20px;
    --font-size-lg: 18px;
    --font-size-base: 16px;
    --font-size-sm: 14px;
    --font-size-xs: 12px;
    
    /* 字重 */
    --font-weight-light: 300;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* 行高 */
    --line-height-tight: 1.1;
    --font-line-height-heading: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* 字间距 */
    --letter-spacing-tight: -0.02em;
    --letter-spacing-normal: 0;
    --letter-spacing-wide: 0.02em;
    --letter-spacing-wider: 0.08em;
}

/* ===== 基础重置与全局样式 ===== */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-regular);
    line-height: var(--line-height-normal);
    color: var(--color-gray-700);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}

/* ===== 滚动条美化（苹果风格） ===== */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: var(--color-gray-100);
}

::-webkit-scrollbar-thumb {
    background: var(--color-gray-300);
    border-radius: var(--radius-full);
    transition: background var(--duration-fast) ease;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-gold-500);
}

/* ===== 字体层级系统（H1-H6） ===== */
h1, .h1 {
    font-size: var(--font-size-h1);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    letter-spacing: var(--letter-spacing-tight);
    color: var(--color-gray-900);
}

h2, .h2 {
    font-size: var(--font-size-h2);
    font-weight: var(--font-weight-bold);
    line-height: var(--font-line-height-heading);
    letter-spacing: var(--letter-spacing-tight);
    color: var(--color-gray-900);
}

h3, .h3 {
    font-size: var(--font-size-h3);
    font-weight: var(--font-weight-semibold);
    line-height: var(--font-line-height-heading);
    color: var(--color-gray-800);
}

h4, .h4 {
    font-size: var(--font-size-h4);
    font-weight: var(--font-weight-semibold);
    line-height: var(--font-line-height-heading);
    color: var(--color-gray-800);
}

h5, .h5 {
    font-size: var(--font-size-h5);
    font-weight: var(--font-weight-semibold);
    line-height: var(--line-height-normal);
    color: var(--color-gray-800);
}

h6, .h6 {
    font-size: var(--font-size-h6);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-normal);
    color: var(--color-gray-700);
}

/* ===== 按钮设计系统（三级按钮） ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-02);
    padding: var(--spacing-03) var(--spacing-06);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    line-height: 1;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    transition: all var(--duration-normal) cubic-bezier(0.4, 0, 0.2, 1);
    user-select: none;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left var(--duration-slow) ease;
}

.btn:hover::before {
    left: 100%;
}

/* 主按钮 - 金色渐变 */
.btn-primary {
    background: linear-gradient(135deg, var(--color-gold-500), var(--color-gold-400));
    color: var(--color-white);
    box-shadow: var(--shadow-gold);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(201, 169, 98, 0.35);
}

.btn-primary:active {
    transform: translateY(0);
}

/* 次按钮 - 白色描边 */
.btn-secondary {
    background: transparent;
    color: var(--color-white);
    border: 2px solid rgba(255, 255, 255, 0.5);
}

.btn-secondary:hover {
    background: var(--color-white);
    color: var(--color-primary-800);
    border-color: var(--color-white);
    transform: translateY(-2px);
}

/* 文字按钮 - 极简风格 */
.btn-text {
    background: transparent;
    color: var(--color-gold-500);
    padding: var(--spacing-02) var(--spacing-04);
}

.btn-text:hover {
    background: rgba(201, 169, 98, 0.08);
}

/* 按钮尺寸变体 */
.btn-large {
    padding: var(--spacing-05) var(--spacing-10);
    font-size: var(--font-size-base);
}

.btn-small {
    padding: var(--spacing-02) var(--spacing-04);
    font-size: var(--font-size-xs);
}

/* ===== 通用动画类（苹果风格渐入） ===== */
.animate-fade-in {
    opacity: 0;
    transform: translateY(40px);
    transition: opacity var(--duration-slower) cubic-bezier(0.4, 0, 0.2, 1), 
                transform var(--duration-slower) cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-fade-in.is-visible {
    opacity: 1;
    transform: translateY(0);
}

.animate-fade-left {
    opacity: 0;
    transform: translateX(-60px);
    transition: opacity var(--duration-slower) cubic-bezier(0.4, 0, 0.2, 1), 
                transform var(--duration-slower) cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-fade-left.is-visible {
    opacity: 1;
    transform: translateX(0);
}

.animate-fade-right {
    opacity: 0;
    transform: translateX(60px);
    transition: opacity var(--duration-slower) cubic-bezier(0.4, 0, 0.2, 1), 
                transform var(--duration-slower) cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-fade-right.is-visible {
    opacity: 1;
    transform: translateX(0);
}

.animate-scale-in {
    opacity: 0;
    transform: scale(0.92);
    transition: opacity var(--duration-slower) cubic-bezier(0.4, 0, 0.2, 1), 
                transform var(--duration-slower) cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-scale-in.is-visible {
    opacity: 1;
    transform: scale(1);
}

/* 延迟动画 */
.delay-1 { transition-delay: 100ms; }
.delay-2 { transition-delay: 200ms; }
.delay-3 { transition-delay: 300ms; }
.delay-4 { transition-delay: 400ms; }
.delay-5 { transition-delay: 500ms; }

/* ===== 导航栏（华为/小米风格毛玻璃） ===== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    padding: var(--spacing-06) 0;
    transition: all var(--duration-normal) cubic-bezier(0.4, 0, 0.2, 1);
    background: transparent;
}

/* 滚动时毛玻璃效果 */
.navbar.is-scrolled {
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-04) 0;
}

.navbar-container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--spacing-10);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-03);
    text-decoration: none;
}

.logo-icon {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--color-gold-500), var(--color-gold-400));
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--color-white);
    font-weight: var(--font-weight-bold);
    box-shadow: var(--shadow-gold);
}

.logo-text-group {
    display: flex;
    flex-direction: column;
}

.logo-text {
    font-size: 22px;
    font-weight: var(--font-weight-bold);
    color: var(--color-white);
    letter-spacing: 1px;
    transition: color var(--duration-normal) ease;
}

.navbar.is-scrolled .logo-text {
    color: var(--color-primary-800);
}

.logo-subtitle {
    font-size: 11px;
    color: var(--color-gold-400);
    letter-spacing: 0.5px;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-10);
    align-items: center;
}

.nav-link {
    text-decoration: none;
    color: rgba(255, 255, 255, 0.9);
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    letter-spacing: 0.3px;
    position: relative;
    transition: color var(--duration-normal) ease;
}

.navbar.is-scrolled .nav-link {
    color: var(--color-gray-600);
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -6px;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--color-gold-500);
    transition: all var(--duration-normal) ease;
    transform: translateX(-50%);
    border-radius: var(--radius-full);
}

.nav-link:hover::after,
.nav-link.is-active::after {
    width: 100%;
}

.nav-link:hover,
.nav-link.is-active {
    color: var(--color-gold-500) !important;
}

.nav-cta-btn {
    background: linear-gradient(135deg, var(--color-gold-500), var(--color-gold-400));
    color: var(--color-white);
    padding: var(--spacing-03) var(--spacing-06);
    border-radius: var(--radius-full);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
    transition: all var(--duration-normal) ease;
    box-shadow: var(--shadow-gold);
}

.nav-cta-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 35px rgba(201, 169, 98, 0.4);
}

.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: var(--spacing-02);
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--color-white);
    border-radius: var(--radius-full);
    transition: all var(--duration-normal) ease;
}

.navbar.is-scrolled .mobile-menu-toggle span {
    background: var(--color-primary-800);
}

/* ===== Hero区域（苹果风格超大视觉） ===== */
.hero {
    height: 100vh;
    min-height: 760px;
    position: relative;
    display: flex;
    align-items: center;
    overflow: hidden;
    background: var(--color-primary-900);
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

.hero-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    animation: hero-kenburns 25s ease-in-out infinite;
}

@keyframes hero-kenburns {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.08); }
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        135deg, 
        rgba(15, 15, 26, 0.85) 0%, 
        rgba(15, 15, 26, 0.4) 50%,
        rgba(15, 15, 26, 0.6) 100%
    );
}

.hero-content {
    position: relative;
    z-index: 10;
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--spacing-10);
    width: 100%;
}

.hero-eyebrow {
    display: inline-block;
    color: var(--color-gold-400);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    letter-spacing: 4px;
    text-transform: uppercase;
    margin-bottom: var(--spacing-05);
    opacity: 0;
    animation: hero-fade-up 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.2s forwards;
}

.hero-title {
    font-size: var(--font-size-h1);
    font-weight: var(--font-weight-bold);
    color: var(--color-white);
    line-height: 1.05;
    letter-spacing: -0.03em;
    margin-bottom: var(--spacing-06);
    max-width: 800px;
    opacity: 0;
    animation: hero-fade-up 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.4s forwards;
}

.hero-title .highlight {
    color: var(--color-gold-400);
    position: relative;
}

.hero-description {
    font-size: var(--font-size-lg);
    color: rgba(255, 255, 255, 0.75);
    line-height: var(--line-height-relaxed);
    max-width: 560px;
    margin-bottom: var(--spacing-10);
    opacity: 0;
    animation: hero-fade-up 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.6s forwards;
}

@keyframes hero-fade-up {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-actions {
    display: flex;
    gap: var(--spacing-05);
    opacity: 0;
    animation: hero-fade-up 0.8s cubic-bezier(0.4, 0, 0.2, 1) 0.8s forwards;
}

.hero-scroll-indicator {
    position: absolute;
    bottom: var(--spacing-10);
    left: 50%;
    transform: translateX(-50%);
    z-index: 10;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-02);
    color: rgba(255, 255, 255, 0.5);
    font-size: 10px;
    letter-spacing: 2px;
    text-transform: uppercase;
    animation: hero-bounce 2s ease-in-out infinite;
}

@keyframes hero-bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(12px); }
}

.scroll-mouse {
    width: 26px;
    height: 42px;
    border: 2px solid rgba(255, 255, 255, 0.4);
    border-radius: 13px;
    position: relative;
}

.scroll-mouse::before {
    content: '';
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 8px;
    background: var(--color-gold-400);
    border-radius: 2px;
    animation: hero-scroll-wheel 1.5s ease-in-out infinite;
}

@keyframes hero-scroll-wheel {
    0%, 100% { opacity: 1; top: 8px; }
    50% { opacity: 0.3; top: 22px; }
}

/* ===== 通用区块容器 ===== */
.section {
    padding: var(--spacing-30) 0;
}

.section-header {
    text-align: center;
    max-width: 720px;
    margin: 0 auto var(--spacing-20);
}

.section-eyebrow {
    display: inline-block;
    color: var(--color-gold-500);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-medium);
    letter-spacing: 3px;
    text-transform: uppercase;
    margin-bottom: var(--spacing-04);
}

.section-title {
    font-size: var(--font-size-h2);
    font-weight: var(--font-weight-bold);
    color: var(--color-gray-900);
    line-height: var(--font-line-height-heading);
    margin-bottom: var(--spacing-04);
}

.section-description {
    font-size: var(--font-size-base);
    color: var(--color-gray-500);
    line-height: var(--line-height-relaxed);
}

.container {
    max-width: 1440px;
    margin: 0 auto;
    padding: 0 var(--spacing-10);
}

/* ===== 服务优势卡片（苹果风格） ===== */
.features-section {
    background: var(--color-gray-050);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--spacing-06);
}

.feature-card {
    background: var(--color-white);
    padding: var(--spacing-10) var(--spacing-08);
    border-radius: var(--radius-xl);
    text-align: center;
    transition: all var(--duration-normal) cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    border: 1px solid var(--color-gray-100);
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--color-gold-500), var(--color-gold-400));
    transform: scaleX(0);
    transition: transform var(--duration-normal) ease;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: transparent;
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon-wrapper {
    width: 88px;
    height: 88px;
    margin: 0 auto var(--spacing-06);
    background: linear-gradient(135deg, rgba(201, 169, 98, 0.08), rgba(201, 169, 98, 0.03));
    border-radius: var(--radius-2xl);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    transition: all var(--duration-normal) ease;
}

.feature-card:hover .feature-icon-wrapper {
    background: linear-gradient(135deg, var(--color-gold-500), var(--color-gold-400));
    color: var(--color-white);
    transform: scale(1.08);
    box-shadow: var(--shadow-gold);
}

.feature-title {
    font-size: var(--font-size-h6);
    font-weight: var(--font-weight-semibold);
    color: var(--color-gray-800);
    margin-bottom: var(--spacing-04);
}

.feature-description {
    font-size: var(--font-size-sm);
    color: var(--color-gray-500);
    line-height: var(--line-height-relaxed);
}

/* ===== 产品展示卡片（手机厂商风格） ===== */
.products-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-08);
}

.product-card {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    cursor: pointer;
    aspect-ratio: 4/5;
    background: var(--color-gray-100);
}

.product-image-wrapper {
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.product-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.product-card:hover .product-image {
    transform: scale(1.12);
}

.product-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        to top, 
        rgba(15, 15, 26, 0.95) 0%, 
        rgba(15, 15, 26, 0.4) 50%, 
        transparent 100%
    );
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: var(--spacing-10);
    transition: background var(--duration-normal) ease;
}

.product-card:hover .product-overlay {
    background: linear-gradient(
        to top, 
        rgba(15, 15, 26, 0.98) 0%, 
        rgba(201, 169, 98, 0.15) 100%
    );
}

.product-category-tag {
    display: inline-block;
    color: var(--color-gold-400);
    font-size: 11px;
    font-weight: var(--font-weight-medium);
    letter-spacing: 2px;
    text-transform: uppercase;
    margin-bottom: var(--spacing-03);
}

.product-name {
    font-size: var(--font-size-h5);
    font-weight: var(--font-weight-semibold);
    color: var(--color-white);
    margin-bottom: var(--spacing-04);
}

.product-cta {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-02);
    color: var(--color-white);
    text-decoration: none;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-medium);
    opacity: 0;
    transform: translateX(-20px);
    transition: all var(--duration-normal) ease;
}

.product-card:hover .product-cta {
    opacity: 1;
    transform: translateX(0);
}

.product-cta svg {
    transition: transform var(--duration-fast) ease;
}

.product-card:hover .product-cta svg {
    transform: translateX(4px);
}

/* ===== 案例展示（轻奢风格） ===== */
.cases-section {
    background: var(--color-primary-900);
}

.cases-section .section-title {
    color: var(--color-white);
}

.cases-section .section-description {
    color: rgba(255, 255, 255, 0.6);
}

.cases-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-08);
}

.case-card {
    position: relative;
    border-radius: var(--radius-xl);
    overflow: hidden;
    cursor: pointer;
    background: rgba(255, 255, 255, 0.03);
    transition: all var(--duration-normal) cubic-bezier(0.4, 0, 0.2, 1);
}

.case-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-2xl);
}

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

.case-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.case-card:hover .case-image {
    transform: scale(1.08);
}

.case-content {
    padding: var(--spacing-08);
    background: rgba(255, 255, 255, 0.03);
    backdrop-filter: blur(10px);
}

.case-badge {
    display: inline-block;
    background: linear-gradient(135deg, var(--color-gold-500), var(--color-gold-400));
    color: var(--color-white);
    padding: var(--spacing-01) var(--spacing-04);
    border-radius: var(--radius-full);
    font-size: 11px;
    font-weight: var(--font-weight-medium);
    margin-bottom: var(--spacing-04);
}

.case-title {
    font-size: var(--font-size-h5);
    font-weight: var(--font-weight-semibold);
    color: var(--color-white);
    margin-bottom: var(--spacing-03);
}

.case-meta {
    display: flex;
    gap: var(--spacing-06);
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--font-size-sm);
}

.case-view-btn {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%) scale(0.8);
    width: 64px;
    height: 64px;
    background: linear-gradient(135deg, var(--color-gold-500), var(--color-gold-400));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-white);
    font-size: 20px;
    opacity: 0;
    transition: all var(--duration-normal) ease;
    box-shadow: var(--shadow-gold);
}

.case-card:hover .case-view-btn {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1);
}

/* ===== 页脚（高端风格） ===== */
.footer {
    background: var(--color-primary-900);
    padding: var(--spacing-20) 0 var(--spacing-10);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1.5fr;
    gap: var(--spacing-12);
    margin-bottom: var(--spacing-12);
}

.footer-brand .logo-text {
    color: var(--color-white);
    margin-bottom: var(--spacing-04);
}

.footer-description {
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--font-size-sm);
    line-height: var(--line-height-relaxed);
    margin-bottom: var(--spacing-06);
    max-width: 320px;
}

.footer-title {
    color: var(--color-white);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-06);
}

.footer-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-04);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.5);
    text-decoration: none;
    font-size: var(--font-size-sm);
    transition: color var(--duration-fast) ease;
}

.footer-links a:hover {
    color: var(--color-gold-400);
}

.footer-contact li {
    color: rgba(255, 255, 255, 0.5);
    font-size: var(--font-size-sm);
    margin-bottom: var(--spacing-03);
}

.footer-bottom {
    padding-top: var(--spacing-08);
    border-top: 1px solid rgba(255, 255, 255, 0.08);
    text-align: center;
}

.footer-copyright {
    color: rgba(255, 255, 255, 0.35);
    font-size: var(--font-size-xs);
}

/* ===== 响应式断点系统 ===== */
@media (max-width: 1200px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .products-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .navbar-container {
        padding: 0 var(--spacing-06);
    }
    
    .nav-menu {
        display: none;
    }
    
    .mobile-menu-toggle {
        display: flex;
    }
    
    .container {
        padding: 0 var(--spacing-06);
    }
    
    .hero-content {
        padding: 0 var(--spacing-06);
    }
    
    .cases-grid {
        grid-template-columns: 1fr;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .products-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-08);
    }
    
    .hero-actions {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .section {
        padding: var(--spacing-20) 0;
    }
    
    .hero-title {
        font-size: 36px;
    }
}