/* 全局样式与变量 */
:root {
    --primary: #00d4ff;
    --primary-dark: #0099cc;
    --bg-dark: #0a0e27;
    --bg-card: rgba(15, 20, 45, 0.7);
    --text: #e8ecff;
    --glass-border: rgba(0, 212, 255, 0.3);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', 'Poppins', system-ui, -apple-system, sans-serif;
    background: linear-gradient(135deg, #0a0e27 0%, #1a1f3a 100%);
    color: var(--text);
    overflow-x: hidden;
    line-height: 1.6;
}

/* 玻璃卡片效果 - 优化过渡性能 */
.glass-card {
    background: var(--bg-card);
    backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
    transition: transform 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
    will-change: transform;
}

.glass-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: 0 20px 40px rgba(0, 212, 255, 0.15);
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 20px;
    left: 5%;
    right: 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 30px;
    z-index: 1000;
    background: rgba(10, 14, 39, 0.85);
}

.logo-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-icon {
    font-size: 28px;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #fff, var(--primary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.nav-link {
    color: var(--text);
    text-decoration: none;
    margin-left: 28px;
    transition: color 0.2s;
    font-weight: 500;
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
}

/* 英雄区域 */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 100px 20px;
}

.model-hero {
    min-height: 80vh;
}

.hero-content {
    text-align: center;
    max-width: 1000px;
    z-index: 2;
}

.hero-title {
    font-size: 5rem;
    font-weight: 800;
    margin-bottom: 20px;
    background: linear-gradient(135deg, #ffffff, #00d4ff, #7c3aed);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    animation: fadeInUp 0.8s ease;
}

.gradient-text {
    font-size: 1.8rem;
    font-weight: 600;
    background: linear-gradient(135deg, #00d4ff, #a855f7);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 20px;
}

.hero-subtitle {
    font-size: 1.2rem;
    opacity: 0.8;
    max-width: 600px;
    margin: 0 auto;
}

/* 模型徽章 */
.model-badge {
    display: inline-block;
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    margin-bottom: 15px;
    text-transform: uppercase;
}

.model-badge.flagship {
    background: linear-gradient(135deg, #ffd700, #ffaa00);
    color: #000;
}

.model-badge.speed {
    background: linear-gradient(135deg, #00ff88, #00cc6a);
    color: #000;
}

.model-badge.pro {
    background: linear-gradient(135deg, #a855f7, #7c3aed);
    color: #fff;
}

.model-badge.open {
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    color: #fff;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-top: 50px;
    flex-wrap: wrap;
}

.stat-card {
    padding: 20px 30px;
    text-align: center;
    min-width: 180px;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary);
    display: block;
}

.stat-label {
    font-size: 0.9rem;
    opacity: 0.8;
}

/* 动画 - 使用 GPU 加速 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 架构分层 */
.section {
    padding: 80px 5%;
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 2.8rem;
    margin-bottom: 16px;
    background: linear-gradient(135deg, #fff, var(--primary));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: inline-block;
}

.architecture-stack {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.arch-layer {
    padding: 25px;
    margin: 20px 0;
    position: relative;
    transition: transform 0.3s ease;
}

.connector {
    width: 2px;
    height: 20px;
    background: linear-gradient(to bottom, var(--primary), transparent);
    margin: 0 auto;
}

.layer-badge {
    display: inline-block;
    background: rgba(0, 212, 255, 0.2);
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    margin-top: 12px;
}

/* 能力网格 */
.capability-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
}

.capability-card {
    padding: 30px;
    text-align: center;
}

.capability-icon {
    font-size: 3rem;
    margin-bottom: 15px;
}

.capability-meter {
    height: 6px;
    background: rgba(255,255,255,0.2);
    border-radius: 3px;
    margin-top: 20px;
    position: relative;
    overflow: hidden;
}

.capability-meter::after {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    width: var(--level, 0%);
    background: linear-gradient(90deg, var(--primary), #a855f7);
    border-radius: 3px;
    transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 应用场景 */
.app-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.app-card {
    padding: 25px;
    text-align: center;
}

/* 模型分类网格 - 新增样式 */
.model-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}

.model-category-card {
    padding: 30px;
}

.category-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 15px;
}

.category-icon {
    font-size: 2rem;
}

.category-header h3 {
    font-size: 1.4rem;
    font-weight: 700;
}

.category-desc {
    font-size: 0.95rem;
    opacity: 0.8;
    margin-bottom: 20px;
}

.model-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.model-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    text-decoration: none;
    color: var(--text);
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.model-item:hover {
    background: rgba(0, 212, 255, 0.1);
    border-color: var(--primary);
    transform: translateX(5px);
}

.model-item.placeholder {
    opacity: 0.6;
    cursor: not-allowed;
}

.model-item.placeholder:hover {
    transform: none;
    border-color: transparent;
}

.model-name {
    font-weight: 600;
}

.model-tag {
    font-size: 0.75rem;
    padding: 4px 10px;
    border-radius: 12px;
    font-weight: 600;
}

.model-tag.flagship {
    background: linear-gradient(135deg, #ffd700, #ffaa00);
    color: #000;
}

.model-tag.speed {
    background: linear-gradient(135deg, #00ff88, #00cc6a);
    color: #000;
}

.model-tag.pro {
    background: linear-gradient(135deg, #a855f7, #7c3aed);
    color: #fff;
}

.model-tag.open {
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    color: #fff;
}

.model-tag {
    background: rgba(255, 255, 255, 0.2);
    color: var(--text);
}

/* 时间线 */
.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
}

.timeline-item {
    display: flex;
    margin: 30px 0;
    padding: 20px;
    gap: 20px;
    flex-wrap: wrap;
}

.timeline-year {
    font-weight: 800;
    font-size: 1.5rem;
    color: var(--primary);
    min-width: 120px;
}

.timeline-content h4 {
    margin-bottom: 8px;
}

.highlight {
    border-color: var(--primary);
    background: rgba(0, 212, 255, 0.15);
}

/* 深色背景区域 */
.dark-bg {
    background: rgba(0, 0, 0, 0.3);
}

/* 页脚 */
.footer {
    text-align: center;
    padding: 40px;
    border-top: 1px solid rgba(255,255,255,0.1);
}

/* 响应式 - 优化断点 */
@media (max-width: 768px) {
    .hero-title {
        font-size: 2.5rem;
    }
    .navbar {
        flex-direction: column;
        gap: 12px;
    }
    .nav-link {
        margin: 0 12px;
        font-size: 0.9rem;
    }
    .timeline-item {
        flex-direction: column;
    }
    .model-grid {
        grid-template-columns: 1fr;
    }
}

/* 减少动画对性能敏感设备的影响 */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}