/* ============================================
   CovePsy 团队介绍页 - 样式表
   ============================================ */

/* CSS 变量 */
:root {
    /* 主色调 - 心理主题渐变 */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #ec4899;
    --accent: #14b8a6;
    --accent-light: #2dd4bf;

    /* 中性色 */
    --bg: #f8fafc;
    --bg-alt: #f1f5f9;
    --surface: #ffffff;
    --text: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --border: #e2e8f0;

    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -1px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.03);
    --shadow-lg: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 25px 50px -12px rgba(0, 0, 0, 0.15);

    /* 间距 */
    --radius-sm: 8px;
    --radius: 12px;
    --radius-md: 16px;
    --radius-lg: 24px;
    --radius-full: 9999px;

    /* 过渡 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s ease;

    /* 布局 */
    --container-max: 1200px;
    --nav-height: 70px;
}

/* 重置 */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    scroll-padding-top: var(--nav-height);
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
                 "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue",
                 Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-fast);
}

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

/* 容器 */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 24px;
}

/* ============================================
   导航栏
   ============================================ */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--nav-height);
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid transparent;
    z-index: 1000;
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    border-bottom-color: var(--border);
    box-shadow: var(--shadow-sm);
}

/* 面包屑导航 */
.breadcrumb {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    height: 36px;
    background: rgba(248, 249, 251, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border);
    z-index: 999;
    overflow: hidden;
    max-height: 0;
    transition: max-height 0.3s ease, opacity 0.3s ease;
    opacity: 0;
}

.breadcrumb.visible {
    max-height: 36px;
    opacity: 1;
}

.breadcrumb-container {
    max-width: var(--container-max);
    height: 36px;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.8rem;
    color: var(--text-light);
}

.breadcrumb-item {
    color: var(--primary);
    text-decoration: none;
    transition: var(--transition);
}

.breadcrumb-item:hover {
    text-decoration: underline;
}

.breadcrumb-sep {
    color: var(--text-lighter, #cbd5e1);
}

.breadcrumb-current {
    color: var(--text);
    font-weight: 500;
}

.nav-container {
    max-width: var(--container-max);
    height: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: #fff;
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    font-weight: 800;
    letter-spacing: -0.5px;
}

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

.nav-menu {
    display: flex;
    list-style: none;
    gap: 4px;
}

.nav-link {
    padding: 8px 16px;
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
    color: var(--primary);
    background: rgba(99, 102, 241, 0.08);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text);
    border-radius: 2px;
    transition: var(--transition);
}

.nav-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}
.nav-toggle.active span:nth-child(2) {
    opacity: 0;
}
.nav-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* ============================================
   Hero 区域
   ============================================ */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    overflow: hidden;
    padding: 80px 24px 60px;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 0;
}

.hero-gradient {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
        radial-gradient(ellipse 80% 60% at 50% 0%, rgba(99, 102, 241, 0.12), transparent),
        radial-gradient(ellipse 60% 50% at 80% 50%, rgba(236, 72, 153, 0.08), transparent),
        radial-gradient(ellipse 60% 50% at 20% 80%, rgba(20, 184, 166, 0.08), transparent),
        linear-gradient(180deg, #f8fafc 0%, #f1f5f9 100%);
}

.hero-particles {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.particle {
    position: absolute;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    opacity: 0.15;
    animation: float-particle 15s infinite ease-in-out;
}

@keyframes float-particle {
    0%, 100% { transform: translateY(0) translateX(0); }
    25% { transform: translateY(-30px) translateX(20px); }
    50% { transform: translateY(-15px) translateX(-15px); }
    75% { transform: translateY(-40px) translateX(10px); }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 800px;
    animation: fadeInUp 0.8s ease;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-badge {
    display: inline-block;
    padding: 6px 18px;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.85rem;
    font-weight: 500;
    color: var(--primary);
    margin-bottom: 24px;
}

.hero-title {
    margin-bottom: 20px;
}

.title-line {
    display: block;
    font-size: clamp(2.5rem, 7vw, 4.5rem);
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -1px;
    line-height: 1.1;
}

.title-sub {
    display: block;
    font-size: clamp(1rem, 3vw, 1.5rem);
    font-weight: 600;
    color: var(--text);
    margin-top: 12px;
    letter-spacing: 0.5px;
}

.hero-desc {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--text-secondary);
    margin-bottom: 40px;
}

.hero-stats {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 20px;
    margin-bottom: 40px;
    flex-wrap: wrap;
}

.stat-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-num {
    font-size: clamp(1.8rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--primary);
    line-height: 1;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--text-light);
    margin-top: 6px;
}

.stat-divider {
    width: 1px;
    height: 40px;
    background: var(--border);
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 32px;
    border-radius: var(--radius);
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-outline {
    background: transparent;
    color: var(--text);
    border: 2px solid var(--border);
}

.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

/* ============================================
   通用 Section
   ============================================ */
.section {
    padding: 100px 0;
    position: relative;
    z-index: 1;
}

.section .container {
    position: relative;
    z-index: 2;
}

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

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

.section-tag {
    display: inline-block;
    font-size: 0.75rem;
    font-weight: 700;
    letter-spacing: 2px;
    color: var(--primary);
    text-transform: uppercase;
    margin-bottom: 12px;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--text);
    letter-spacing: -0.5px;
}

.section-line {
    width: 60px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    border-radius: 2px;
    margin: 16px auto 0;
}

.section-subtitle {
    font-size: 1.05rem;
    color: var(--text-secondary);
    margin-top: 16px;
}

/* ============================================
   关于我们
   ============================================ */
.about-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: start;
}

.about-text {
    font-size: 1.05rem;
    color: var(--text-secondary);
}

.about-text p {
    margin-bottom: 20px;
}

.about-lead {
    font-size: 1.2rem !important;
    color: var(--text) !important;
    font-weight: 500;
    line-height: 1.6;
}

.highlight {
    color: var(--primary);
    font-weight: 600;
}

.inline-link {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    border-bottom: 1px dashed var(--primary);
    transition: var(--transition);
}

.inline-link:hover {
    color: var(--primary-dark, #4f46e5);
    border-bottom-style: solid;
}

.about-features {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.feature-card {
    padding: 28px 24px;
    background: var(--surface);
    border-radius: var(--radius-md);
    border: 1px solid var(--border);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(99, 102, 241, 0.3);
}

.feature-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius);
    color: var(--primary);
    margin-bottom: 16px;
}

.feature-icon svg {
    width: 24px;
    height: 24px;
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 8px;
    color: var(--text);
}

.feature-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

/* ============================================
   团队成员
   ============================================ */
.members-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 28px;
}

.member-card {
    position: relative;
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 32px 28px;
    border: 1px solid var(--border);
    transition: var(--transition);
    overflow: hidden;
}

.member-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    opacity: 0;
    transition: var(--transition);
}

.member-card:hover {
    transform: translateY(-6px);
    box-shadow: var(--shadow-xl);
    border-color: rgba(99, 102, 241, 0.2);
}

.member-card:hover::before {
    opacity: 1;
}

.member-avatar {
    position: relative;
    width: 80px;
    height: 80px;
    margin-bottom: 20px;
}

.avatar-circle {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 700;
    color: #fff;
    position: relative;
    z-index: 1;
}

.avatar-circle-large {
    width: 120px;
    height: 120px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 3rem;
    font-weight: 700;
    color: #fff;
    position: relative;
    z-index: 1;
}

.avatar-glow {
    position: absolute;
    top: -4px;
    left: -4px;
    right: -4px;
    bottom: -4px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    opacity: 0;
    filter: blur(12px);
    transition: var(--transition);
}

.member-card:hover .avatar-glow,
.advisor-card:hover .avatar-glow {
    opacity: 0.3;
}

.member-name {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 4px;
}

.member-role {
    display: inline-block;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 12px;
}

.member-desc {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 16px;
}

.member-skills {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
}

.skill-tag {
    padding: 4px 12px;
    background: var(--bg-alt);
    border: 1px solid var(--border);
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

.member-card:hover .skill-tag {
    border-color: rgba(99, 102, 241, 0.2);
    background: rgba(99, 102, 241, 0.05);
    color: var(--primary);
}

.member-badge {
    position: absolute;
    top: 20px;
    right: 20px;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
}

.badge-lead {
    background: linear-gradient(135deg, #f59e0b, #ef4444);
    color: #fff;
}

.badge-tech {
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    color: #fff;
}

/* ============================================
   指导老师
   ============================================ */
.advisor-card {
    display: flex;
    gap: 48px;
    align-items: center;
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 48px;
    border: 1px solid var(--border);
    transition: var(--transition);
    max-width: 900px;
    margin: 0 auto;
}

.advisor-card:hover {
    box-shadow: var(--shadow-lg);
}

.advisor-avatar {
    position: relative;
    flex-shrink: 0;
}

.advisor-info {
    flex: 1;
}

.advisor-name {
    font-size: 1.75rem;
    font-weight: 800;
    color: var(--text);
    margin-bottom: 4px;
}

.advisor-title {
    display: inline-block;
    font-size: 1rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 16px;
}

.advisor-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 24px;
}

.advisor-responsibilities {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
}

.resp-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.9rem;
    color: var(--text);
}

.resp-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    background: rgba(20, 184, 166, 0.1);
    color: var(--accent);
    border-radius: 50%;
    font-size: 0.7rem;
    font-weight: 700;
}

/* ============================================
   项目展示
   ============================================ */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 28px;
}

.project-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--border);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
}

.project-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(99, 102, 241, 0.2);
}

.project-featured {
    grid-column: span 2;
    background: linear-gradient(135deg, #ffffff, #f8fafc);
    border: 2px solid rgba(99, 102, 241, 0.15);
}

.project-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}

.project-icon {
    width: 52px;
    height: 52px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, rgba(99, 102, 241, 0.1), rgba(236, 72, 153, 0.1));
    border-radius: var(--radius);
    color: var(--primary);
}

.project-icon svg {
    width: 26px;
    height: 26px;
}

.project-status {
    padding: 4px 14px;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
}

.status-active {
    background: rgba(20, 184, 166, 0.1);
    color: var(--accent);
}

.status-dev {
    background: rgba(245, 158, 11, 0.1);
    color: #d97706;
}

.project-name {
    font-size: 1.35rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 12px;
}

.project-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: 20px;
    flex: 1;
}

.project-features {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin-bottom: 20px;
}

.project-feature {
    padding: 4px 12px;
    background: var(--bg-alt);
    border-radius: var(--radius-sm);
    font-size: 0.8rem;
    color: var(--text-secondary);
}

.project-platforms {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
}

.platform {
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 0.9rem;
    color: var(--text);
    font-weight: 500;
}

.platform-icon {
    font-size: 1.2rem;
}

.project-link {
    margin-top: auto;
}

.project-cta {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--primary);
    transition: var(--transition-fast);
}

.project-cta:hover {
    gap: 8px;
    color: var(--primary-dark);
}

.project-cta.muted {
    color: var(--text-light);
    pointer-events: none;
}

/* ============================================
   技术栈
   ============================================ */
.tech-categories {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
}

.tech-category {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.tech-category:hover {
    box-shadow: var(--shadow-md);
}

.tech-cat-header {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 24px;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--border);
}

.tech-cat-icon {
    font-size: 1.5rem;
}

.tech-cat-header h3 {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--text);
}

.tech-items {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
}

.tech-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 16px 8px;
    border-radius: var(--radius);
    transition: var(--transition-fast);
    cursor: default;
}

.tech-item:hover {
    background: var(--bg-alt);
    transform: translateY(-2px);
}

.tech-logo {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-sm);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.85rem;
    font-weight: 800;
    margin-bottom: 10px;
    transition: var(--transition);
    box-shadow: var(--shadow-sm);
}

.tech-item:hover .tech-logo {
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

.tech-name {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text);
    margin-bottom: 2px;
}

.tech-detail {
    font-size: 0.75rem;
    color: var(--text-light);
}

/* ============================================
   基础设施
   ============================================ */
.infra-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr;
    gap: 40px;
    align-items: start;
}

.infra-servers {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.server-card {
    background: var(--surface);
    border-radius: var(--radius-md);
    padding: 24px;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.server-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.server-main {
    grid-column: span 2;
    border: 2px solid rgba(99, 102, 241, 0.15);
    background: linear-gradient(135deg, #ffffff, #fafbff);
}

.server-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 12px;
}

.server-name {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
}

.server-tag {
    padding: 3px 10px;
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
}

.server-spec {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 12px;
}

.spec-item {
    font-size: 0.85rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.spec-dot {
    color: var(--text-light);
}

.server-desc {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 16px;
    line-height: 1.5;
}

.server-services {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
}

.server-services span {
    padding: 3px 10px;
    background: var(--bg-alt);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    color: var(--text-secondary);
}

.infra-services {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 32px;
    border: 1px solid var(--border);
}

.infra-subtitle {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 20px;
    padding-bottom: 12px;
    border-bottom: 1px solid var(--border);
}

.domain-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.domain-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px 16px;
    background: var(--bg-alt);
    border-radius: var(--radius-sm);
    transition: var(--transition-fast);
}

a.domain-item:hover {
    background: rgba(99, 102, 241, 0.05);
    transform: translateX(4px);
}

.domain-planned {
    opacity: 0.6;
}

.domain-name {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text);
    font-family: "SF Mono", "Fira Code", "Consolas", monospace;
}

.domain-desc {
    font-size: 0.8rem;
    color: var(--text-light);
}

/* ============================================
   联系我们
   ============================================ */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.contact-card {
    background: var(--surface);
    border-radius: var(--radius-lg);
    padding: 32px 24px;
    border: 1px solid var(--border);
    text-align: center;
    transition: var(--transition);
}

.contact-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
    border-color: rgba(99, 102, 241, 0.2);
}

.contact-icon {
    width: 56px;
    height: 56px;
    margin: 0 auto 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(99, 102, 241, 0.1);
    border-radius: var(--radius);
    color: var(--primary);
}

.contact-icon svg {
    width: 28px;
    height: 28px;
}

.contact-card h3 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text);
    margin-bottom: 8px;
}

.contact-card p {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.contact-link {
    color: var(--primary);
    font-weight: 500;
}

.contact-link:hover {
    text-decoration: underline;
}

/* ============================================
   页脚
   ============================================ */
.footer {
    background: #0f172a;
    color: #cbd5e1;
    padding: 60px 0 24px;
}

.footer-top {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
    padding-bottom: 40px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 16px;
}

.footer-logo .logo-icon {
    background: linear-gradient(135deg, var(--primary-light), var(--secondary));
}

.footer-logo .logo-text {
    color: #fff;
    -webkit-text-fill-color: #fff;
    font-size: 1.25rem;
    font-weight: 700;
}

.footer-tagline {
    font-size: 0.9rem;
    color: #94a3b8;
    line-height: 1.6;
}

.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}

.footer-col h4 {
    color: #fff;
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 16px;
}

.footer-col a,
.footer-col span {
    display: block;
    font-size: 0.85rem;
    color: #94a3b8;
    margin-bottom: 10px;
    transition: var(--transition-fast);
}

.footer-col a:hover {
    color: var(--primary-light);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.footer-bottom p {
    font-size: 0.85rem;
    color: #64748b;
}

.footer-icp a {
    font-size: 0.85rem;
    color: #64748b;
    transition: var(--transition-fast);
}

.footer-icp a:hover {
    color: var(--primary-light);
}

/* ============================================
   回到顶部
   ============================================ */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: #fff;
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: var(--transition);
    z-index: 999;
}

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

.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

.back-to-top svg {
    width: 24px;
    height: 24px;
}

/* ============================================
   动画
   ============================================ */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 触屏设备：禁用 hover 位移，避免 sticky hover 导致重叠 */
@media (hover: none) and (pointer: coarse) {
    .member-card:hover,
    .feature-card:hover,
    .tech-category:hover,
    .project-card:hover,
    .server-card:hover,
    .domain-item:hover,
    .advisor-card:hover {
        transform: none !important;
    }
}

/* 触屏设备：减小 reveal 位移距离，避免动画期间元素重叠 */
@media (hover: none) and (pointer: coarse) {
    .reveal {
        transform: translateY(12px);
    }
}

/* ============================================
   响应式
   ============================================ */

/* 平板 (max-width: 1024px) */
@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .tech-categories {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .infra-grid {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .projects-grid {
        grid-template-columns: 1fr;
    }

    .project-featured {
        grid-column: span 1;
    }

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

    .footer-top {
        grid-template-columns: 1fr;
        gap: 40px;
    }
}

/* 手机 (max-width: 768px) */
@media (max-width: 768px) {
    :root {
        --nav-height: 60px;
    }

    .section {
        padding: 70px 0;
    }

    .section-header {
        margin-bottom: 40px;
    }

    /* 导航栏 */
    .nav-toggle {
        display: flex;
    }

    .nav-menu {
        position: fixed;
        top: var(--nav-height);
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        flex-direction: column;
        padding: 20px;
        gap: 4px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-link {
        display: block;
        padding: 12px 16px;
        font-size: 1rem;
    }

    /* Hero */
    .hero {
        padding: 60px 20px 40px;
    }

    /* Section padding 减小，避免移动端间距过大 */
    .section {
        padding: 60px 0;
    }

    .section-header {
        margin-bottom: 40px;
    }

    .hero-stats {
        gap: 12px;
    }

    .stat-divider {
        height: 30px;
    }

    .stat-num {
        font-size: 1.5rem;
    }

    .hero-actions {
        flex-direction: column;
        width: 100%;
    }

    .btn {
        width: 100%;
    }

    /* 关于 */
    .about-features {
        grid-template-columns: 1fr;
    }

    /* 成员 */
    .members-grid {
        grid-template-columns: 1fr;
    }

    /* 指导老师 */
    .advisor-card {
        flex-direction: column;
        text-align: center;
        padding: 32px 24px;
        gap: 24px;
    }

    .advisor-responsibilities {
        grid-template-columns: 1fr;
        text-align: left;
    }

    /* 技术栈 */
    .tech-items {
        grid-template-columns: repeat(2, 1fr);
    }

    .tech-category {
        padding: 24px;
    }

    /* 基础设施 */
    .infra-servers {
        grid-template-columns: 1fr;
    }

    .server-main {
        grid-column: span 1;
    }

    /* 联系 */
    .contact-grid {
        grid-template-columns: 1fr;
    }

    /* 页脚 */
    .footer-links {
        grid-template-columns: 1fr;
        gap: 28px;
    }

    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }

    /* 回到顶部 */
    .back-to-top {
        bottom: 20px;
        right: 20px;
        width: 42px;
        height: 42px;
    }
}

/* 小手机 (max-width: 480px) */
@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }

    .hero-badge {
        font-size: 0.75rem;
    }

    .stat-divider {
        display: none;
    }

    .hero-stats {
        gap: 20px;
    }

    .breadcrumb {
        display: none;
    }

    .member-card {
        padding: 24px 20px;
    }

    .project-card {
        padding: 24px 20px;
    }

    .tech-items {
        grid-template-columns: 1fr 1fr;
    }
}

/* 打印优化 */
@media print {
    .navbar,
    .back-to-top,
    .hero-particles {
        display: none !important;
    }

    .section {
        padding: 30px 0;
    }
}