/* 室内CAD整体方案设计 - 土木订单班建筑大地色系设计系统 */

/* ========== 设计变量 ========== */
:root {
    /* 建筑大地色主题 - 土木工程/室内设计风格 */
    --bg-dark: #faf8f5;              /* 米白背景 - 暖色调 */
    --bg-semi-dark: rgba(250, 248, 245, 0.95);  /* 半透明米白 */
    --bg-overlay: rgba(255, 255, 255, 0.85);    /* 白色遮罩 */
    --bg-card: rgba(255, 255, 255, 0.9);        /* 卡片背景 */
    --primary-dark: #78350f;         /* 深棕色 - 木质感 */
    --primary-brown: #a16207;        /* 主色大地棕 - 土木专业 */
    --accent-concrete: #57534e;      /* 混凝土灰强调 - 建筑材料 */
    --accent-gold: #d97706;          /* 古铜金色 */
    --text-light: #78350f;           /* 深棕色文字 */
    --text-gray: #57534e;            /* 灰色文字 */
    --border-light: rgba(161, 98, 7, 0.2);    /* 棕色边框 */
    --hover-bg: rgba(161, 98, 7, 0.12);       /* 悬停背景 */
    --active-bg: rgba(161, 98, 7, 0.18);      /* 激活背景 */

    /* 间距系统 - 针对大屏幕优化 */
    --spacing-xs: 0.75rem;    /* 12px */
    --spacing-sm: 1.25rem;    /* 20px */
    --spacing-md: 2rem;       /* 32px */
    --spacing-lg: 3rem;       /* 48px */
    --spacing-xl: 4rem;       /* 64px */
    --spacing-2xl: 6rem;      /* 96px */
    --spacing-3xl: 8rem;      /* 128px */

    /* 字体系统 */
    --font-primary: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Inter', sans-serif;

    /* 字体大小 - 针对大屏幕优化 */
    --text-xs: 0.875rem;      /* 14px */
    --text-sm: 1rem;          /* 16px */
    --text-base: 1.125rem;    /* 18px */
    --text-lg: 1.375rem;      /* 22px */
    --text-xl: 1.625rem;      /* 26px */
    --text-2xl: 2rem;         /* 32px */
    --text-3xl: 2.5rem;       /* 40px */
    --text-4xl: 3rem;         /* 48px */
    --text-5xl: 4rem;         /* 64px */

    /* 字重 */
    --font-light: 300;
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;

    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* 阴影 - 建筑专业主题 */
    --shadow-sm: 0 1px 2px rgba(120, 53, 15, 0.08);
    --shadow-md: 0 2px 4px rgba(120, 53, 15, 0.12);
    --shadow-lg: 0 4px 8px rgba(120, 53, 15, 0.15);
    --shadow-xl: 0 8px 16px rgba(120, 53, 15, 0.18);
    --shadow-brown: 0 2px 8px rgba(161, 98, 7, 0.2);

    /* 过渡 */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* 布局 */
    --container-max: 1600px;  /* 增加最大宽度适配1920屏幕 */
}

/* ========== 深色主题 - 深棕木质配色 ========== */
body.dark-theme {
    --bg-dark: #292524;                      /* 深棕背景 */
    --bg-semi-dark: rgba(41, 37, 36, 0.95);  /* 深棕半透明 */
    --bg-overlay: rgba(120, 53, 15, 0.85);   /* 深棕遮罩层 */
    --bg-card: rgba(68, 64, 60, 0.9);        /* 深灰卡片背景 */
    --primary-dark: #292524;                 /* 深棕 */
    --primary-brown: #d97706;                /* 明亮古铜金 */
    --accent-concrete: #a8a29e;              /* 亮混凝土灰 */
    --accent-gold: #fbbf24;                  /* 明亮金色 */
    --text-light: #fafaf9;                   /* 浅色文字 */
    --text-gray: #e7e5e4;                    /* 灰色文字 */
    --border-light: rgba(217, 119, 6, 0.3);  /* 金棕色边框 */
    --hover-bg: rgba(217, 119, 6, 0.15);     /* 悬停背景 */
    --active-bg: rgba(217, 119, 6, 0.25);    /* 激活背景 */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.4);
    --shadow-md: 0 2px 4px rgba(0,0,0,0.5);
    --shadow-lg: 0 4px 8px rgba(0,0,0,0.6);
    --shadow-xl: 0 8px 16px rgba(0,0,0,0.7);
    --shadow-brown: 0 2px 8px rgba(217, 119, 6, 0.3);
}

/* ========== 重置样式 ========== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--text-light);
    background-color: var(--bg-dark);
    overflow-x: hidden;
}

/* ========== Hero 区域 - 全屏图片背景 ========== */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background:
        linear-gradient(135deg, rgba(240, 249, 255, 0.9) 0%, rgba(224, 242, 254, 0.95) 100%),
        url('../images/室内平面设计图.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    position: relative;
    overflow: hidden;
}

/* 深色主题下的Hero渐变 */
body.dark-theme .hero {
    background:
        linear-gradient(135deg, rgba(120, 53, 15, 0.9) 0%, rgba(161, 98, 7, 0.8) 100%),
        url('../images/室内平面设计图.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.hero::before {
    content: '';
    position: absolute;
    width: 100%;
    height: 100%;
    background-image:
        radial-gradient(circle at 20% 50%, rgba(161, 98, 7, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(120, 53, 15, 0.05) 0%, transparent 50%);
    pointer-events: none;
    animation: glow 8s ease-in-out infinite;
}

@keyframes glow {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.6; }
}

.hero-content {
    text-align: center;
    color: var(--text-light);
    z-index: 1;
    position: relative;
    padding: var(--spacing-xl);
    max-width: 900px;
}

.hero-badge {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    background: rgba(161, 98, 7, 0.15);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-radius: var(--radius-full);
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-xl);
    border: 3px solid var(--primary-brown);
    box-shadow: var(--shadow-brown);
    text-transform: uppercase;
    transition: all var(--transition-base);
}

.hero-badge:hover {
    background: rgba(161, 98, 7, 0.25);
    transform: translateY(-2px);
}

.hero-title {
    font-size: clamp(3.5rem, 10vw, 6.5rem);
    font-weight: var(--font-bold);
    margin-bottom: var(--spacing-lg);
    letter-spacing: -0.02em;
    line-height: 1.1;
    color: var(--accent-gold);
    text-shadow: 0 6px 30px rgba(0,0,0,0.8), 0 0 60px rgba(161, 98, 7, 0.4);
}

.hero-subtitle {
    font-size: clamp(1.5rem, 4vw, 2.5rem);
    font-weight: var(--font-light);
    opacity: 0.95;
    margin-bottom: var(--spacing-xl);
    color: var(--text-light);
}

.hero-description {
    font-size: var(--text-xl);
    opacity: 0.85;
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
}

/* ========== 导航 - 深色玻璃态 ========== */
.nav {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--bg-semi-dark);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-light);
    padding: var(--spacing-md) 0;
    box-shadow: var(--shadow-md);
}

.nav-container {
    display: flex;
    justify-content: center;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    padding: 0 var(--spacing-md);
}

.nav-item {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-overlay);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-light);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-base);
    font-weight: var(--font-medium);
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    color: var(--text-gray);
}

.nav-item i {
    width: 20px;
    height: 20px;
    stroke-width: 2;
}

.nav-item span {
    font-size: var(--text-base);
}

.nav-item:hover {
    background: var(--hover-bg);
    color: var(--primary-brown);
    transform: translateY(-2px);
    box-shadow: var(--shadow-brown);
}

.nav-item.active {
    background: var(--active-bg);
    color: var(--primary-brown);
    border-color: var(--primary-brown);
    box-shadow: var(--shadow-brown);
}

/* ========== 内容区块 - 图片背景 ========== */
.section {
    padding: var(--spacing-2xl) 0;
    background: var(--bg-dark);
    position: relative;
}

/* 浅色图片背景 - 每个区块使用不同图片 */
.section:nth-child(2) {
    background-image:
        linear-gradient(to bottom, rgba(240, 249, 255, 0.9) 0%, rgba(224, 242, 254, 1) 100%),
        url('https://images.unsplash.com/photo-1600607687939-ce8a6c25118c?w=1920&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.section:nth-child(3) {
    background-image:
        linear-gradient(to bottom, rgba(240, 249, 255, 0.9) 0%, rgba(224, 242, 254, 1) 100%),
        url('https://images.unsplash.com/photo-1600566753190-17f0baa2a6c3?w=1920&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.section:nth-child(4) {
    background-image:
        linear-gradient(to bottom, rgba(240, 249, 255, 0.9) 0%, rgba(224, 242, 254, 1) 100%),
        url('https://images.unsplash.com/photo-1618221195710-dd6b41faaea6?w=1920&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.section:nth-child(5) {
    background-image:
        linear-gradient(to bottom, rgba(240, 249, 255, 0.9) 0%, rgba(224, 242, 254, 1) 100%),
        url('https://images.unsplash.com/photo-1600607687644-c7171b42498f?w=1920&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.section:nth-child(6) {
    background-image:
        linear-gradient(to bottom, rgba(240, 249, 255, 0.9) 0%, rgba(224, 242, 254, 1) 100%),
        url('https://images.unsplash.com/photo-1600607687920-4e2a09cf159d?w=1920&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

.section:nth-child(7) {
    background-image:
        linear-gradient(to bottom, rgba(240, 249, 255, 0.9) 0%, rgba(224, 242, 254, 1) 100%),
        url('https://images.unsplash.com/photo-1600210492486-724fe5c67fb0?w=1920&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

/* 深色主题下的区块背景 */
body.dark-theme .section:nth-child(2) {
    background-image:
        linear-gradient(to bottom, rgba(120, 53, 15, 0.92) 0%, rgba(161, 98, 7, 0.88) 100%),
        url('https://images.unsplash.com/photo-1600607687939-ce8a6c25118c?w=1920&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

body.dark-theme .section:nth-child(3) {
    background-image:
        linear-gradient(to bottom, rgba(161, 98, 7, 0.90) 0%, rgba(120, 53, 15, 0.88) 100%),
        url('https://images.unsplash.com/photo-1600566753190-17f0baa2a6c3?w=1920&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

body.dark-theme .section:nth-child(4) {
    background-image:
        linear-gradient(to bottom, rgba(120, 53, 15, 0.92) 0%, rgba(161, 98, 7, 0.88) 100%),
        url('https://images.unsplash.com/photo-1618221195710-dd6b41faaea6?w=1920&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

body.dark-theme .section:nth-child(5) {
    background-image:
        linear-gradient(to bottom, rgba(161, 98, 7, 0.90) 0%, rgba(120, 53, 15, 0.88) 100%),
        url('https://images.unsplash.com/photo-1600607687644-c7171b42498f?w=1920&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

body.dark-theme .section:nth-child(6) {
    background-image:
        linear-gradient(to bottom, rgba(161, 98, 7, 0.90) 0%, rgba(120, 53, 15, 0.88) 100%),
        url('https://images.unsplash.com/photo-1600607687920-4e2a09cf159d?w=1920&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

body.dark-theme .section:nth-child(7) {
    background-image:
        linear-gradient(to bottom, rgba(120, 53, 15, 0.92) 0%, rgba(161, 98, 7, 0.88) 100%),
        url('https://images.unsplash.com/photo-1600210492486-724fe5c67fb0?w=1920&q=80');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
}

/* 深色主题下的特定元素调整 */
body.dark-theme .stat-item {
    background: rgba(161, 98, 7, 0.8);
    backdrop-filter: blur(5px);
}

body.dark-theme .stat-item:hover {
    background: rgba(217, 119, 6, 0.15);
    border-color: var(--primary-brown);
}

body.dark-theme .stat-value {
    color: var(--accent-gold);
}

body.dark-theme th {
    background: rgba(217, 119, 6, 0.12);
    color: var(--accent-gold);
}

body.dark-theme tr:hover {
    background: rgba(217, 119, 6, 0.08);
}

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

.section-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-card);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-radius: var(--radius-xl);
    border: 2px solid var(--border-light);
    box-shadow: var(--shadow-md);
}

.agent-avatar {
    width: 100px;
    height: 100px;
    border-radius: var(--radius-xl);
    object-fit: cover;
    border: 3px solid var(--primary-brown);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.agent-avatar:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
    border-color: var(--accent-slate);
}

.agent-info {
    flex: 1;
}

.agent-name {
    font-size: var(--text-lg);
    color: var(--primary-brown);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: var(--spacing-sm);
    font-weight: var(--font-semibold);
}

.section-title {
    font-size: var(--text-4xl);
    font-weight: var(--font-bold);
    color: var(--text-light);
    letter-spacing: -0.01em;
    text-shadow: none;
    position: relative;
    padding-bottom: var(--spacing-sm);
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 180px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-brown), transparent);
    border-radius: 2px;
}

.section-content {
    max-width: 100%;
    margin: 0 auto;
}

.expert-intro {
    background: var(--bg-card);
    backdrop-filter: blur(15px);
    -webkit-backdrop-filter: blur(15px);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
    border: 2px solid var(--border-light);
    box-shadow: var(--shadow-md);
}

.expert-intro h3 {
    font-size: var(--text-2xl);
    color: var(--primary-brown);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.expert-intro p {
    color: var(--text-gray);
    line-height: 1.8;
    font-size: var(--text-lg);
}

/* ========== 网格布局 - 针对大屏幕优化 ========== */
.grid {
    display: grid;
    gap: var(--spacing-2xl);
}

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

.grid-3 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(3, 1fr);
}

/* ========== 卡片 - 图片优先布局 ========== */
.card {
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-radius: var(--radius-2xl);
    overflow: hidden;
    border: 2px solid var(--border-light);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    padding: 0;
    display: flex;
    flex-direction: column;
}

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

.card-header {
    padding: var(--spacing-xl);
    background: var(--bg-semi-dark);
    border-bottom: 2px solid var(--border-light);
    order: 2;
}

.card-title {
    font-size: var(--text-2xl);
    font-weight: var(--font-semibold);
    color: var(--primary-brown);
    margin-bottom: var(--spacing-sm);
}

.card-body {
    padding: var(--spacing-xl);
    order: 3;
    flex: 1;
}

/* ========== 图片容器 - 突出展示 ========== */
.image-container {
    width: 100%;
    aspect-ratio: 3/2;
    overflow: hidden;
    border-radius: 0;
    margin-bottom: 0;
    background: rgba(0,0,0,0.5);
    position: relative;
    box-shadow: none;
    border: none;
    transition: all var(--transition-base);
    order: 1;
    flex-shrink: 0;
}

.image-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-slow);
    filter: brightness(0.9);
}

.image-container:hover img {
    transform: scale(1.1);
    filter: brightness(1.1);
}

.image-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    padding: var(--spacing-md);
    background: linear-gradient(to top, rgba(0,0,0,0.9), transparent);
    color: var(--text-light);
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    text-align: center;
    transform: translateY(100%);
    transition: transform var(--transition-base);
}

.image-container:hover .image-caption {
    transform: translateY(0);
}

/* ========== 列表 ========== */
.feature-list {
    list-style: none;
    padding: 0;
}

.feature-list li {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-light);
    color: var(--text-gray);
    transition: all var(--transition-fast);
}

.feature-list li:hover {
    color: var(--primary-brown);
    padding-left: var(--spacing-sm);
}

.feature-list li:last-child {
    border-bottom: none;
}

/* ========== 统计数据 ========== */
.stats {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--bg-overlay);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
}

.stat-item {
    flex: 1;
    text-align: center;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    background: var(--bg-card);
    border: 1px solid transparent;
    transition: all var(--transition-base);
}

.stat-item:hover {
    background: var(--hover-bg);
    transform: translateY(-4px);
    border-color: var(--border-light);
    box-shadow: var(--shadow-md);
}

.stat-label {
    font-size: var(--text-sm);
    color: var(--text-gray);
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    font-size: var(--text-2xl);
    font-weight: var(--font-bold);
    color: var(--primary-brown);
    text-shadow: none;
}

/* ========== 表格 ========== */
.table-container {
    overflow-x: auto;
    margin: var(--spacing-xl) 0;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

table {
    width: 100%;
    border-collapse: collapse;
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    overflow: hidden;
}

th {
    background: var(--active-bg);
    color: var(--primary-brown);
    padding: var(--spacing-md);
    text-align: left;
    font-weight: var(--font-semibold);
    border-bottom: 2px solid var(--primary-brown);
}

td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-light);
    color: var(--text-gray);
}

tr:last-child td {
    border-bottom: none;
}

tr:hover {
    background: var(--hover-bg);
}

/* ========== 响应式 ========== */
@media (max-width: 768px) {
    :root {
        --spacing-sm: 0.75rem;
        --spacing-md: 1rem;
        --spacing-lg: 1.5rem;
        --spacing-xl: 2rem;
        --spacing-2xl: 3rem;
        --spacing-3xl: 4rem;
    }

    .hero {
        background-attachment: scroll;
    }

    .section:nth-child(odd),
    .section:nth-child(even) {
        background-attachment: scroll;
    }

    .hero-content {
        padding: var(--spacing-lg);
    }

    .nav-container {
        gap: var(--spacing-xs);
    }

    .nav-item {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: var(--text-sm);
    }

    .section {
        padding: var(--spacing-2xl) 0;
    }

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    .section-header {
        flex-direction: column;
        text-align: center;
    }

    .stats {
        flex-direction: column;
    }
}

/* ========== 动画 ========== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes shimmer {
    0% {
        background-position: -1000px 0;
    }
    100% {
        background-position: 1000px 0;
    }
}

.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

.slide-in {
    animation: slideIn 0.6s ease forwards;
}

/* ========== 工具类 ========== */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }

.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }

.hidden { display: none; }
.block { display: block; }
.flex { display: flex; }
.grid { display: grid; }

.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }

/* ========== 图片加载状态 ========== */
img {
    transition: opacity var(--transition-base);
}

img.loaded {
    opacity: 1;
}

img.error {
    opacity: 0.5;
    filter: grayscale(1);
}

/* ========== SVG图标尺寸统一管理 ========== */
.hero-description i[data-lucide] {
    width: 24px !important;
    height: 24px !important;
    display: inline-block !important;
    vertical-align: middle !important;
    margin-right: 8px !important;
}

.agent-name i[data-lucide] {
    width: 20px !important;
    height: 20px !important;
    display: inline-block !important;
    vertical-align: middle !important;
    margin-right: 8px !important;
}

.expert-intro h3 i[data-lucide] {
    width: 40px !important;
    height: 40px !important;
    display: inline-block !important;
    vertical-align: middle !important;
    margin-right: 10px !important;
}

.feature-list li i[data-lucide] {
    width: 18px !important;
    height: 18px !important;
    display: inline-block !important;
    vertical-align: middle !important;
    margin-right: 8px !important;
}

.nav-item i[data-lucide] {
    width: 20px !important;
    height: 20px !important;
    display: block !important;
    margin: 0 auto 4px !important;
}

/* ========== 主题切换按钮 ========== */
.theme-toggle {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 1000;
}

.theme-toggle-btn {
    position: relative;
    width: 64px;
    height: 32px;
    background: var(--bg-card);
    border: 2px solid var(--border-light);
    border-radius: var(--radius-full);
    cursor: pointer;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 6px;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.theme-toggle-btn:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.theme-toggle-btn:active {
    transform: scale(0.95);
}

.theme-icon {
    width: 18px !important;
    height: 18px !important;
    transition: all var(--transition-base);
    color: var(--text-gray);
}

body:not(.dark-theme) .theme-icon-light {
    color: var(--primary-brown);
    transform: scale(1.2);
}

body:not(.dark-theme) .theme-icon-dark {
    opacity: 0.5;
}

body.dark-theme .theme-icon-dark {
    color: var(--primary-brown);
    transform: scale(1.2);
}

body.dark-theme .theme-icon-light {
    opacity: 0.5;
}

/* ========== 图文交错布局 ========== */
.alternating-layout {
    display: flex;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    align-items: center;
}

.alternating-layout:last-child {
    margin-bottom: 0;
}

.alternating-layout.reverse {
    flex-direction: row-reverse;
}

.alternating-content {
    flex: 1;
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-2xl);
    padding: var(--spacing-xl);
    border: 2px solid var(--border-light);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
}

.alternating-content:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-brown);
}

.alternating-content h3 {
    color: var(--primary-brown);
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.alternating-content h3 i {
    width: 24px;
    height: 24px;
}

.alternating-image {
    flex: 1;
    aspect-ratio: 4/3;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
    border: 2px solid var(--border-light);
    transition: all var(--transition-base);
}

.alternating-image:hover {
    transform: scale(1.02);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-brown);
}

.alternating-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-base);
}

.alternating-image:hover img {
    transform: scale(1.05);
}

/* ========== 大图小卡片组合布局 ========== */
.hero-cards-layout {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.hero-image-container {
    width: 100%;
    aspect-ratio: 16/9;
    border-radius: var(--radius-2xl);
    overflow: hidden;
    box-shadow: var(--shadow-xl);
    border: 2px solid var(--border-light);
    position: relative;
    transition: all var(--transition-base);
}

.hero-image-container:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 40px rgba(120, 53, 15, 0.3);
    border-color: var(--primary-brown);
}

.hero-image-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-base);
}

.hero-image-container:hover img {
    transform: scale(1.05);
}

.hero-image-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(to top, rgba(120, 53, 15, 0.95), rgba(120, 53, 15, 0.7), transparent);
    padding: var(--spacing-2xl);
    color: white;
}

.hero-image-overlay h3 {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: white;
}

.hero-image-overlay h3 i {
    width: 28px;
    height: 28px;
}

.hero-image-overlay p {
    font-size: 1.1rem;
    opacity: 0.95;
}

.hero-cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
}

/* ========== 时间线布局 ========== */
.timeline-layout {
    position: relative;
    padding-left: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
}

.timeline-layout::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(to bottom, var(--primary-brown), var(--accent-slate));
    border-radius: var(--radius-full);
}

.timeline-item {
    position: relative;
    margin-bottom: var(--spacing-2xl);
    display: flex;
    gap: var(--spacing-xl);
    align-items: center;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-dot {
    position: absolute;
    left: calc(-1 * var(--spacing-2xl) - 8px);
    width: 20px;
    height: 20px;
    background: var(--primary-brown);
    border: 3px solid white;
    border-radius: var(--radius-full);
    box-shadow: 0 0 0 4px var(--bg-card);
    transition: all var(--transition-base);
}

body.dark-theme .timeline-dot {
    border-color: var(--bg-dark);
    box-shadow: 0 0 0 4px var(--bg-dark);
}

.timeline-item:hover .timeline-dot {
    background: var(--accent-slate);
    transform: scale(1.3);
}

.timeline-content {
    flex: 1;
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-xl);
    padding: var(--spacing-lg);
    border: 2px solid var(--border-light);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.timeline-content:hover {
    transform: translateX(8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-brown);
}

.timeline-content h4 {
    color: var(--primary-brown);
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.timeline-content p {
    color: var(--text-gray);
    line-height: 1.6;
}

.timeline-image {
    flex: 1;
    aspect-ratio: 3/2;
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border: 2px solid var(--border-light);
}

.timeline-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition-base);
}

.timeline-item:hover .timeline-image img {
    transform: scale(1.05);
}

/* ========== 响应式布局 ========== */
@media (max-width: 768px) {
    .alternating-layout,
    .alternating-layout.reverse {
        flex-direction: column;
    }

    .alternating-image {
        aspect-ratio: 16/9;
    }

    .hero-image-container {
        aspect-ratio: 4/3;
    }

    .hero-image-overlay h3 {
        font-size: 1.4rem;
    }

    .timeline-layout {
        padding-left: var(--spacing-lg);
    }

    .timeline-dot {
        left: calc(-1 * var(--spacing-lg) - 8px);
        width: 16px;
        height: 16px;
    }

    .timeline-item {
        flex-direction: column;
        align-items: flex-start;
    }

    .timeline-content:hover {
        transform: translateX(4px);
    }
}

/* ========== 统计数据图表样式 ========== */
.stats-chart {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--bg-card);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    border: 2px solid var(--border-light);
    box-shadow: var(--shadow-sm);
}

.stat-item-chart {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.stat-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.stat-header .stat-label {
    font-size: 1rem;
    font-weight: 600;
    color: var(--text-gray);
}

.stat-header .stat-value {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--primary-brown);
}

.stat-bar {
    width: 100%;
    height: 12px;
    background: var(--bg-dark);
    border-radius: var(--radius-full);
    overflow: hidden;
    position: relative;
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.1);
}

body.dark-theme .stat-bar {
    background: rgba(255, 255, 255, 0.1);
}

.stat-bar-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-brown), var(--accent-slate));
    border-radius: var(--radius-full);
    transition: width 1s ease-out;
    position: relative;
    animation: fillBar 1.5s ease-out;
    box-shadow: 0 0 8px rgba(161, 98, 7, 0.4);
}

@keyframes fillBar {
    from {
        width: 0;
        opacity: 0.6;
    }
    to {
        opacity: 1;
    }
}