/* ========== 基础变量 ========== */
:root {
    --primary: #3b82f6;
    --primary-dark: #2563eb;
    --primary-light: #93bbfd;
    --primary-glow: rgba(59,130,246,0.35);
    --accent: #06b6d4;
    --bg: #f8fafc;
    --bg-alt: #f1f5f9;
    --bg-card: #ffffff;
    --text: #0f172a;
    --text-secondary: #475569;
    --text-muted: #94a3b8;
    --border: #e2e8f0;
    --shadow: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
    --shadow-glow: 0 0 30px var(--primary-glow);
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
    --primary: #60a5fa;
    --primary-dark: #3b82f6;
    --primary-light: #1e3a5f;
    --primary-glow: rgba(96,165,250,0.25);
    --accent: #22d3ee;
    --bg: #0a0f1a;
    --bg-alt: #111827;
    --bg-card: #1a2234;
    --text: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border: #1e293b;
    --shadow: 0 1px 3px rgba(0,0,0,0.4);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.4);
    --shadow-lg: 0 10px 25px rgba(0,0,0,0.5);
}

/* ========== Reset ========== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.7;
    overflow-x: hidden;
    transition: background var(--transition), color var(--transition);
}
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { border: none; background: none; cursor: pointer; font-family: inherit; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 24px; }

/* ========== 粒子画布 ========== */
.particles-canvas {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    z-index: 0; pointer-events: none;
}

/* ========== Header ========== */
.header {
    position: fixed; top: 0; left: 0; right: 0; z-index: 100;
    background: transparent;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.header.scrolled {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}
.header-inner {
    display: flex; align-items: center; justify-content: space-between;
    height: 72px;
}
.logo {
    display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 1.1rem;
    position: relative; z-index: 101;
    color: var(--text); transition: color 0.4s;
}
.logo-img {
    height: 36px; width: auto;
    transition: transform 0.3s;
}
.logo:hover .logo-img { transform: rotate(10deg) scale(1.05); }
.nav { display: flex; gap: 4px; }
.nav-link {
    padding: 8px 16px; border-radius: 50px;
    font-size: 0.9rem; font-weight: 500;
    color: var(--text-secondary);
    transition: all var(--transition); position: relative;
}
.nav-link::after {
    content: ''; position: absolute; bottom: 4px; left: 50%; width: 0; height: 2px;
    background: var(--primary); border-radius: 2px;
    transition: all 0.3s; transform: translateX(-50%);
}
.nav-link:hover, .nav-link.active { color: var(--primary); }
.nav-link:hover::after, .nav-link.active::after { width: 24px; }

.header-actions { display: flex; align-items: center; gap: 4px; }
.theme-toggle {
    width: 42px; height: 42px; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem; transition: all var(--transition);
    color: var(--text-secondary);
}
.theme-toggle:hover { background: var(--bg-alt); transform: rotate(30deg); }
.icon-sun { display: none; }
.icon-moon { display: inline; }
[data-theme="dark"] .icon-sun { display: inline; }
[data-theme="dark"] .icon-moon { display: none; }

.menu-toggle {
    display: none; flex-direction: column; gap: 5px;
    width: 42px; height: 42px; align-items: center; justify-content: center;
    position: relative; z-index: 101;
}
.menu-toggle span {
    display: block; width: 22px; height: 2px;
    background: var(--text); border-radius: 2px;
    transition: all 0.3s;
}
.menu-toggle.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.menu-toggle.active span:nth-child(2) { opacity: 0; }
.menu-toggle.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* 移动端遮罩 */
.mobile-overlay {
    position: fixed; inset: 0; background: rgba(0,0,0,0.5);
    z-index: 99; opacity: 0; pointer-events: none;
    transition: opacity 0.3s;
    backdrop-filter: blur(4px);
}
.mobile-overlay.active { opacity: 1; pointer-events: auto; }

/* ========== Hero ========== */
.hero {
    position: relative; overflow: hidden;
    padding: 140px 0 100px;
    background: linear-gradient(135deg, #f0f4ff 0%, #e0e8f5 40%, #eae4f6 70%, #f0f4ff 100%);
    color: var(--text);
    min-height: 100vh;
    display: flex; align-items: center;
    transition: background 0.4s, color 0.4s;
}
[data-theme="dark"] .hero {
    background: linear-gradient(135deg, #0a0f1a 0%, #0f2847 40%, #1a1040 70%, #0a0f1a 100%);
    color: #fff;
}
.hero-bg { position: absolute; inset: 0; }
.hero-grid {
    width: 100%; height: 100%;
    background-image:
        linear-gradient(rgba(59,130,246,0.18) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59,130,246,0.18) 1px, transparent 1px);
    background-size: 60px 60px;
    animation: gridMove 25s linear infinite;
    mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 100%);
    -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 40%, black 30%, transparent 100%);
}
[data-theme="dark"] .hero-grid {
    background-image:
        linear-gradient(rgba(59,130,246,0.12) 1px, transparent 1px),
        linear-gradient(90deg, rgba(59,130,246,0.12) 1px, transparent 1px);
}
@keyframes gridMove { to { transform: translate(60px, 60px); } }
.hero-glow {
    position: absolute; top: 20%; left: 50%; transform: translateX(-50%);
    width: 600px; height: 600px;
    background: radial-gradient(circle, rgba(59,130,246,0.12) 0%, rgba(6,182,212,0.06) 40%, transparent 70%);
    animation: glowPulse 6s ease-in-out infinite;
}
[data-theme="dark"] .hero-glow {
    background: radial-gradient(circle, rgba(59,130,246,0.15) 0%, rgba(6,182,212,0.08) 40%, transparent 70%);
}
@keyframes glowPulse {
    0%, 100% { opacity: 0.6; transform: translateX(-50%) scale(1); }
    50% { opacity: 1; transform: translateX(-50%) scale(1.15); }
}

.hero-content { position: relative; z-index: 1; text-align: center; }
.hero-logo-wrap { margin-bottom: 20px; }
.hero-logo {
    height: 100px; width: auto; margin: 0 auto;
    filter: drop-shadow(0 4px 20px rgba(59,130,246,0.3));
    animation: heroLogoFloat 4s ease-in-out infinite;
}
@keyframes heroLogoFloat {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}
.hero-badge {
    display: inline-block; padding: 8px 24px;
    background: rgba(59,130,246,0.1); border: 1px solid rgba(59,130,246,0.2);
    border-radius: 50px; font-size: 0.85rem; color: var(--primary);
    margin-bottom: 28px;
    backdrop-filter: blur(8px);
}
[data-theme="dark"] .hero-badge {
    background: rgba(59,130,246,0.12); border-color: rgba(59,130,246,0.25);
    color: #93c5fd;
}
.hero-title {
    font-size: clamp(2.4rem, 6vw, 4rem); font-weight: 900;
    letter-spacing: -0.03em; margin-bottom: 20px; min-height: 1.2em;
    background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 50%, #3b82f6 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
[data-theme="dark"] .hero-title {
    background: linear-gradient(135deg, #fff 0%, #93bbfd 50%, #60a5fa 100%);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.typing-cursor {
    -webkit-text-fill-color: var(--primary);
    animation: blink 1s step-end infinite;
    font-weight: 300;
}
@keyframes blink { 50% { opacity: 0; } }
.hero-subtitle {
    font-size: clamp(0.95rem, 1.5vw, 1.1rem);
    color: var(--text-secondary); max-width: 800px; margin: 0 auto 48px;
    line-height: 1.8;
    white-space: nowrap;
}
[data-theme="dark"] .hero-subtitle {
    color: rgba(255,255,255,0.6);
}
.hero-stats { display: flex; justify-content: center; gap: 56px; margin-bottom: 48px; }
.stat-item { text-align: center; }
.stat-number {
    display: block; font-size: 2.8rem; font-weight: 900;
    background: linear-gradient(135deg, #60a5fa, #06b6d4);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.stat-label { font-size: 0.85rem; color: var(--text-muted); letter-spacing: 0.02em; }
[data-theme="dark"] .stat-label { color: rgba(255,255,255,0.5); }
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 48px; }
.btn {
    display: inline-flex; align-items: center; gap: 10px;
    padding: 14px 36px; border-radius: 50px;
    font-size: 1rem; font-weight: 600;
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative; overflow: hidden;
}
.btn::before {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(135deg, transparent, rgba(255,255,255,0.1), transparent);
    transform: translateX(-100%);
    transition: transform 0.5s;
}
.btn:hover::before { transform: translateX(100%); }
.btn-primary {
    background: linear-gradient(135deg, var(--primary), #2563eb);
    color: #fff; box-shadow: 0 4px 20px rgba(59,130,246,0.3);
}
.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 30px rgba(59,130,246,0.45);
}
.btn-outline {
    border: 2px solid var(--primary); color: var(--primary);
    backdrop-filter: blur(4px);
}
.btn-outline:hover {
    background: var(--primary); color: #fff;
    transform: translateY(-3px);
}
[data-theme="dark"] .btn-outline {
    border-color: rgba(255,255,255,0.25); color: #fff;
}
[data-theme="dark"] .btn-outline:hover {
    border-color: rgba(255,255,255,0.6);
    background: rgba(255,255,255,0.08);
}

/* 滚动提示 */
.scroll-hint {
    display: flex; flex-direction: column; align-items: center; gap: 10px;
    color: var(--text-secondary); font-size: 0.8rem;
}
[data-theme="dark"] .scroll-hint { color: rgba(255,255,255,0.4); }
.scroll-mouse {
    width: 24px; height: 38px; border: 2px solid var(--text-secondary);
    border-radius: 12px; position: relative;
    opacity: 0.5;
}
[data-theme="dark"] .scroll-mouse { border-color: rgba(255,255,255,0.3); opacity: 1; }
.scroll-dot {
    width: 3px; height: 8px; background: var(--text-secondary);
    border-radius: 3px; position: absolute; top: 6px; left: 50%;
    transform: translateX(-50%);
    animation: scrollDown 1.8s ease-in-out infinite;
}
[data-theme="dark"] .scroll-dot { background: rgba(255,255,255,0.6); }
@keyframes scrollDown {
    0% { opacity: 1; transform: translateX(-50%) translateY(0); }
    100% { opacity: 0; transform: translateX(-50%) translateY(16px); }
}

/* 入场动画 */
.anim-fade-up {
    opacity: 0; transform: translateY(30px);
    animation: fadeUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
@keyframes fadeUp {
    to { opacity: 1; transform: translateY(0); }
}

/* ========== Section 通用 ========== */
.section { padding: 100px 0; position: relative; z-index: 1; }
.section-alt { background: var(--bg-alt); }
.section-header { text-align: center; margin-bottom: 64px; }
.section-tag {
    display: inline-block; padding: 6px 16px;
    background: rgba(59,130,246,0.08); color: var(--primary);
    border-radius: 50px; font-size: 0.8rem; font-weight: 600;
    text-transform: uppercase; letter-spacing: 0.08em;
    margin-bottom: 14px;
}
.section-title {
    font-size: clamp(1.8rem, 4vw, 2.6rem); font-weight: 900;
    margin-bottom: 14px; letter-spacing: -0.02em;
}
.section-desc { color: var(--text-secondary); max-width: 560px; margin: 0 auto; font-size: 1.05rem; }

/* 滚动入场 */
.reveal { opacity: 0; transition: all 0.8s cubic-bezier(0.16, 1, 0.3, 1); }
.reveal.reveal-up { transform: translateY(40px); }
.reveal.reveal-left { transform: translateX(-40px); }
.reveal.reveal-right { transform: translateX(40px); }
.reveal.visible { opacity: 1; transform: translate(0); }

/* 卡片光泽 */
.card-shine {
    position: absolute; top: 0; left: -100%; width: 50%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.06), transparent);
    transition: left 0.6s; pointer-events: none;
}
*:hover > .card-shine { left: 100%; }

/* ========== Services ========== */
.services-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 28px; }
.service-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 40px 32px;
    text-align: center; transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative; overflow: hidden;
}
.service-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0); transform-origin: left;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}
.service-card:hover::before { transform: scaleX(1); }
.service-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg), 0 0 40px var(--primary-glow);
    border-color: transparent;
}
.service-icon-wrap {
    width: 80px; height: 80px; margin: 0 auto 20px;
    background: linear-gradient(135deg, rgba(59,130,246,0.1), rgba(6,182,212,0.1));
    border-radius: 20px; display: flex; align-items: center; justify-content: center;
    transition: all 0.4s;
}
.service-card:hover .service-icon-wrap {
    transform: scale(1.1) rotate(5deg);
    background: linear-gradient(135deg, rgba(59,130,246,0.2), rgba(6,182,212,0.2));
}
.service-icon { font-size: 2.4rem; }
.service-card h3 { font-size: 1.25rem; font-weight: 700; margin-bottom: 10px; }
.service-card p { color: var(--text-secondary); font-size: 0.95rem; line-height: 1.7; }
.service-slogan {
    display: inline-block; margin-top: 14px; padding: 4px 14px;
    background: rgba(59,130,246,0.08); color: var(--primary);
    border-radius: 50px; font-size: 0.8rem; font-weight: 600;
}

/* ========== About Intro ========== */
.about-intro {
    max-width: 800px; margin: 0 auto 48px;
    text-align: center;
}
.about-intro p {
    color: var(--text-secondary); font-size: 1.05rem; line-height: 1.9;
    margin-bottom: 14px;
}
.about-intro strong { color: var(--text); }

/* ========== Groups ========== */
.groups-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.group-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 36px 30px;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative; overflow: hidden;
}
.group-bg-icon {
    position: absolute; top: -20px; right: -20px;
    font-size: 8rem; opacity: 0.04;
    transition: all 0.5s;
    pointer-events: none;
}
.group-card:hover .group-bg-icon { transform: scale(1.2) rotate(10deg); opacity: 0.08; }
.group-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0); transform-origin: left;
    transition: transform 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}
.group-card:hover::before { transform: scaleX(1); }
.group-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
}
.group-card-featured { border-color: var(--primary); }
.group-card-featured::before { transform: scaleX(1); }
.group-header { display: flex; align-items: center; justify-content: space-between; margin-bottom: 18px; }
.group-icon {
    font-size: 2.4rem;
    transition: transform 0.4s;
}
.group-card:hover .group-icon { transform: scale(1.15) rotate(-5deg); }
.group-badge {
    padding: 5px 14px; background: var(--bg-alt); border-radius: 50px;
    font-size: 0.72rem; font-weight: 600; color: var(--text-muted);
    text-transform: uppercase; letter-spacing: 0.06em;
}
.group-title { font-size: 1.35rem; font-weight: 700; margin-bottom: 12px; }
.group-desc { color: var(--text-secondary); font-size: 0.95rem; margin-bottom: 22px; line-height: 1.7; }
.group-features { display: flex; flex-direction: column; gap: 10px; }
.group-features li {
    position: relative; padding-left: 22px; font-size: 0.9rem; color: var(--text-secondary);
    transition: all 0.3s;
}
.group-features li::before {
    content: '›'; position: absolute; left: 0; color: var(--primary);
    font-weight: 700; transition: transform 0.3s;
}
.group-features li:hover { color: var(--text); padding-left: 26px; }
.group-features li:hover::before { transform: translateX(2px); }
.group-target {
    margin-top: 18px; padding: 12px 16px;
    background: rgba(59,130,246,0.06); border-radius: var(--radius-sm);
    font-size: 0.85rem; color: var(--text-muted);
    border-left: 3px solid var(--primary);
}

/* ========== Horizontal Timeline ========== */
.timeline-scroll-wrap {
    overflow-x: auto; overflow-y: hidden;
    padding: 20px 0 30px; margin: 0 -24px; padding-left: 24px; padding-right: 24px;
    scrollbar-width: thin; scrollbar-color: var(--primary) var(--bg-alt);
    -webkit-overflow-scrolling: touch;
    cursor: grab;
}
.timeline-scroll-wrap:active { cursor: grabbing; }
.timeline-scroll-wrap::-webkit-scrollbar { height: 6px; }
.timeline-scroll-wrap::-webkit-scrollbar-track { background: var(--bg-alt); border-radius: 3px; }
.timeline-scroll-wrap::-webkit-scrollbar-thumb { background: var(--primary); border-radius: 3px; }
.timeline-track {
    display: flex; align-items: flex-start;
    position: relative; min-width: max-content;
    padding-top: 20px; padding-bottom: 10px;
}
.timeline-line {
    position: absolute; top: 29px; left: 0; right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--border), var(--primary) 20%, var(--accent) 80%, var(--border));
    border-radius: 2px;
}
.timeline-node {
    display: flex; flex-direction: column; align-items: center;
    position: relative; min-width: 180px; padding: 0 12px;
}
.timeline-dot {
    width: 16px; height: 16px; border-radius: 50%;
    background: var(--primary); border: 3px solid var(--bg);
    box-shadow: 0 0 0 3px rgba(59,130,246,0.2);
    position: relative; z-index: 2;
    transition: all 0.3s;
}
.dot-highlight {
    width: 20px; height: 20px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    box-shadow: 0 0 0 4px rgba(59,130,246,0.25), 0 0 20px rgba(59,130,246,0.2);
    animation: dotPulse 2s ease-in-out infinite;
}
@keyframes dotPulse {
    0%, 100% { box-shadow: 0 0 0 4px rgba(59,130,246,0.25), 0 0 20px rgba(59,130,246,0.2); }
    50% { box-shadow: 0 0 0 6px rgba(59,130,246,0.15), 0 0 30px rgba(59,130,246,0.3); }
}
.timeline-node:hover .timeline-dot { transform: scale(1.3); }
.timeline-year-label {
    margin-top: 10px; font-size: 1rem; font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.timeline-cards {
    display: flex; flex-direction: column; gap: 10px;
    margin-top: 14px; width: 100%;
}
.timeline-card {
    display: block; padding: 16px;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    transition: all 0.3s; text-decoration: none;
    position: relative; overflow: hidden;
}
.timeline-card::before {
    content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
    background: linear-gradient(to bottom, var(--primary), var(--accent));
    transform: scaleY(0); transition: transform 0.3s;
}
.timeline-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-md); }
.timeline-card:hover::before { transform: scaleY(1); }
.timeline-card-featured { border-color: var(--primary); }
.timeline-card-featured::before { transform: scaleY(1); }
.tc-tag {
    display: inline-block; padding: 2px 8px;
    background: rgba(59,130,246,0.1); color: var(--primary);
    border-radius: 50px; font-size: 0.7rem; font-weight: 600;
    margin-bottom: 6px;
}
.tc-tag-gold {
    background: linear-gradient(135deg, rgba(234,179,8,0.15), rgba(245,158,11,0.15));
    color: #b45309;
}
[data-theme="dark"] .tc-tag-gold { color: #fbbf24; }
.timeline-card h4 { font-size: 0.9rem; font-weight: 700; margin-bottom: 4px; color: var(--text); }
.timeline-card p { font-size: 0.8rem; color: var(--text-secondary); line-height: 1.5; margin-bottom: 6px; }
.tc-link {
    font-size: 0.72rem; color: var(--primary); font-weight: 600;
    opacity: 0; transition: opacity 0.3s;
}
.timeline-card:hover .tc-link { opacity: 1; }

.honor-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 28px;
    transition: all 0.4s;
}
.honor-card:hover { box-shadow: var(--shadow-md); transform: translateX(4px); }
.honor-card-featured { border-color: var(--primary); }
.honor-card-featured .honor-tag {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
}
.honor-tag {
    display: inline-block; padding: 4px 12px;
    background: linear-gradient(135deg, rgba(59,130,246,0.1), rgba(6,182,212,0.1));
    color: var(--primary);
    border-radius: 50px; font-size: 0.75rem; font-weight: 600;
    margin-bottom: 10px;
}
.honor-card h4 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.honor-card p { color: var(--text-secondary); font-size: 0.95rem; }
.honor-awards { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 14px; }
.award {
    padding: 5px 14px; border-radius: 50px;
    font-size: 0.8rem; font-weight: 600;
    background: var(--bg-alt); color: var(--text-secondary);
    transition: all 0.3s;
}
.award:hover { transform: translateY(-2px); }
.award-gold { background: linear-gradient(135deg, #fef3c7, #fde68a); color: #92400e; }
.award-silver { background: linear-gradient(135deg, #dbeafe, #bfdbfe); color: #1e40af; }
.award-bronze { background: linear-gradient(135deg, #fce7f3, #fbcfe8); color: #9d174d; }
[data-theme="dark"] .award-gold { background: linear-gradient(135deg, #78350f, #92400e); color: #fef3c7; }
[data-theme="dark"] .award-silver { background: linear-gradient(135deg, #1e3a5f, #1e40af); color: #93bbfd; }
[data-theme="dark"] .award-bronze { background: linear-gradient(135deg, #831843, #9d174d); color: #fce7f3; }

/* ========== Recruit ========== */
.recruit-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: stretch; }
.recruit-item {
    display: flex; gap: 18px; padding: 22px;
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); transition: all 0.4s;
    position: relative; overflow: hidden;
}
.recruit-item::before {
    content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 3px;
    background: linear-gradient(to bottom, var(--primary), var(--accent));
    transform: scaleY(0); transition: transform 0.4s;
}
.recruit-item:hover::before { transform: scaleY(1); }
.recruit-item:hover { box-shadow: var(--shadow-md); transform: translateX(4px); }
.recruit-icon { font-size: 2rem; flex-shrink: 0; transition: transform 0.3s; }
.recruit-item:hover .recruit-icon { transform: scale(1.15); }
.recruit-item h4 { font-weight: 700; margin-bottom: 4px; }
.recruit-item p { color: var(--text-secondary); font-size: 0.95rem; }
.text-muted { color: var(--text-muted); font-size: 0.85rem; }
.recruit-info { display: flex; flex-direction: column; gap: 16px; }
.cta-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 36px; text-align: center;
    display: flex; flex-direction: column; justify-content: center; height: 100%;
    position: sticky; top: 100px;
}
.qr-box {
    width: 180px; height: 180px; margin: 0 auto 14px;
    background: var(--bg-alt); border: 2px dashed var(--border);
    border-radius: var(--radius-sm);
    display: flex; align-items: center; justify-content: center;
    color: var(--text-muted); font-size: 0.85rem;
    transition: all 0.3s;
}
.qr-box:hover { border-color: var(--primary); transform: scale(1.03); }
.cta-qr-label { font-weight: 600; margin-bottom: 28px; }
.cta-platforms h4 { font-weight: 700; margin-bottom: 16px; }
.platform-links { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.platform-link {
    display: flex; align-items: center; gap: 10px;
    padding: 14px 18px; background: var(--bg-alt);
    border-radius: var(--radius-sm); font-size: 0.9rem; font-weight: 500;
    transition: all 0.3s; position: relative; overflow: hidden;
}
.platform-link::before {
    content: ''; position: absolute; inset: 0;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    opacity: 0; transition: opacity 0.3s;
}
.platform-link:hover::before { opacity: 1; }
.platform-link:hover { color: #fff; transform: translateY(-2px); }
.platform-link span { position: relative; z-index: 1; }
.platform-icon { font-size: 1.2rem; }

/* ========== Culture ========== */
.culture-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.culture-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 28px 24px; text-align: center;
    transition: all 0.4s;
}
.culture-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.culture-emoji { font-size: 2.4rem; display: block; margin-bottom: 12px; }
.culture-card h4 { font-weight: 700; margin-bottom: 8px; }
.culture-card p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.6; }

/* ========== Recruit Flow ========== */
.cta-flow { margin-bottom: 24px; text-align: left; }
.cta-flow h4 { font-weight: 700; margin-bottom: 14px; }
.flow-steps { display: flex; flex-direction: column; gap: 10px; }
.flow-step {
    display: flex; align-items: center; gap: 10px;
    padding: 10px 14px; background: var(--bg-alt);
    border-radius: var(--radius-sm); font-size: 0.9rem;
    transition: all 0.3s;
}
.flow-step:hover { background: rgba(59,130,246,0.08); transform: translateX(4px); }
.flow-num {
    width: 28px; height: 28px; flex-shrink: 0;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff; border-radius: 50%;
    display: flex; align-items: center; justify-content: center;
    font-size: 0.78rem; font-weight: 700;
}
.cta-expect { margin-bottom: 24px; text-align: left; }
.cta-expect h4 { font-weight: 700; margin-bottom: 14px; font-size: 1.15rem; }
.expect-list { display: flex; flex-direction: column; gap: 12px; }
.expect-list li { font-size: 1rem; color: var(--text-secondary); line-height: 1.6; }

/* ========== Repair Scope ========== */
.repair-scope {
    margin-top: 36px; text-align: center;
}
.repair-scope h4 { font-weight: 700; margin-bottom: 16px; }
.scope-tags { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; }
.scope-tag {
    padding: 10px 20px; background: var(--bg-card);
    border: 1px solid var(--border); border-radius: 50px;
    font-size: 0.9rem; color: var(--text-secondary);
    transition: all 0.3s;
}
.scope-tag:hover { border-color: var(--primary); color: var(--primary); }

/* ========== Repair ========== */
.repair-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.repair-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: var(--radius); padding: 40px 28px; text-align: center;
    transition: all 0.4s; position: relative; overflow: hidden;
}
.repair-card::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    transform: scaleX(0); transform-origin: left;
    transition: transform 0.5s;
}
.repair-card:hover::before { transform: scaleX(1); }
.repair-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.repair-card-featured { border-color: var(--primary); }
.repair-card-featured::before { transform: scaleX(1); }
.repair-icon-wrap {
    width: 72px; height: 72px; margin: 0 auto 18px;
    background: linear-gradient(135deg, rgba(59,130,246,0.1), rgba(6,182,212,0.1));
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    transition: all 0.4s;
}
.repair-card:hover .repair-icon-wrap { transform: scale(1.1) rotate(5deg); }
.repair-icon { font-size: 2rem; }
.repair-card h3 { font-weight: 700; margin-bottom: 8px; }
.repair-value {
    font-size: 1.3rem; font-weight: 700;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 6px;
}
.repair-note { color: var(--text-muted); font-size: 0.9rem; }

/* ========== Footer ========== */
.footer {
    background: var(--bg-card); border-top: 1px solid var(--border);
    padding: 56px 0 28px; position: relative; z-index: 1;
    transition: all var(--transition);
}
.footer-inner {
    display: flex; justify-content: space-between; align-items: center;
    flex-wrap: wrap; gap: 24px; margin-bottom: 36px;
}
.footer-brand { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.footer-logo-img { height: 32px; width: auto; }
.footer-tagline { width: 100%; color: var(--text-muted); font-size: 0.85rem; margin-top: 6px; }
.footer-links { display: flex; gap: 28px; flex-wrap: wrap; }
.footer-links a {
    color: var(--text-secondary); font-size: 0.9rem;
    transition: all 0.3s; position: relative;
}
.footer-links a::after {
    content: ''; position: absolute; bottom: -2px; left: 0;
    width: 0; height: 1px; background: var(--primary);
    transition: width 0.3s;
}
.footer-links a:hover { color: var(--primary); }
.footer-links a:hover::after { width: 100%; }
.footer-bottom {
    text-align: center; padding-top: 28px;
    border-top: 1px solid var(--border);
    color: var(--text-muted); font-size: 0.85rem;
}

/* ========== Back to Top ========== */
.back-to-top {
    position: fixed; bottom: 32px; right: 32px; z-index: 90;
    width: 50px; height: 50px; border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: #fff;
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 4px 20px rgba(59,130,246,0.3);
    opacity: 0; pointer-events: none; transform: translateY(20px);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}
.back-to-top.visible { opacity: 1; pointer-events: auto; transform: translateY(0); }
.back-to-top:hover { transform: translateY(-4px); box-shadow: 0 8px 30px rgba(59,130,246,0.45); }

/* ========== 响应式 ========== */
@media (max-width: 1024px) {
    .groups-grid { grid-template-columns: 1fr; max-width: 520px; margin: 0 auto; }
    .recruit-grid { grid-template-columns: 1fr; }
}

/* ========== 平板 (≤1024px) ========== */
@media (max-width: 1024px) {
    .groups-grid { grid-template-columns: 1fr 1fr; }
    .recruit-grid { grid-template-columns: 1fr; }
    .cta-card { position: static; }
}

/* ========== 手机 (≤768px) ========== */
@media (max-width: 768px) {
    /* 导航 - 侧边抽屉 */
    .nav {
        position: fixed; top: 0; right: 0; bottom: 0;
        width: 280px; background: var(--bg-card);
        flex-direction: column; padding: 90px 28px 40px;
        transform: translateX(100%);
        transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
        box-shadow: -8px 0 30px rgba(0,0,0,0.15);
        z-index: 100;
        overflow-y: auto;
    }
    .nav.open { transform: translateX(0); }
    .nav.open .nav-link {
        color: var(--text) !important;
        padding: 16px 0; font-size: 1.1rem;
        border-bottom: 1px solid var(--border);
    }
    .nav.open .nav-link:hover { color: var(--primary) !important; }
    .nav-link::after { display: none; }
    .menu-toggle { display: flex; }

    /* Header */
    .header-inner { height: 60px; }
    .logo-img { height: 30px; }
    .logo-text { font-size: 0.95rem; }

    /* Hero */
    .hero { padding: 90px 0 56px; min-height: auto; }
    .hero-logo { height: 72px; }
    .hero-grid { background-size: 40px 40px; }
    .hero-stats { gap: 20px; flex-wrap: wrap; justify-content: center; }
    .stat-item { min-width: 80px; }
    .stat-number { font-size: 2rem; }
    .stat-label { font-size: 0.78rem; }
    .hero-subtitle { font-size: 0.85rem; padding: 0 8px; white-space: normal; }
    .hero-buttons { flex-direction: column; align-items: center; gap: 12px; }
    .btn { width: 100%; max-width: 280px; justify-content: center; padding: 14px 28px; }
    .scroll-hint { display: none; }

    /* Section */
    .section { padding: 56px 0; }
    .section-header { margin-bottom: 36px; }
    .section-title { font-size: 1.6rem; }
    .section-desc { font-size: 0.9rem; }

    /* Services */
    .services-grid { grid-template-columns: 1fr; gap: 16px; }
    .service-card { padding: 28px 20px; }
    .service-icon-wrap { width: 64px; height: 64px; border-radius: 16px; }
    .service-icon { font-size: 2rem; }

    /* Groups */
    .groups-grid { grid-template-columns: 1fr; gap: 16px; }
    .group-card { padding: 24px 20px; }
    .group-icon { font-size: 2rem; }
    .group-bg-icon { font-size: 5rem; }

    /* Timeline */
    .timeline-node { min-width: 150px; padding: 0 8px; }
    .timeline-card { padding: 12px; }
    .timeline-card h4 { font-size: 0.85rem; }
    .timeline-card p { font-size: 0.75rem; }
    .honor-card { padding: 20px; }
    .honor-card h4 { font-size: 1rem; }
    .honor-card p { font-size: 0.9rem; }
    .honor-awards { gap: 6px; }
    .award { padding: 4px 10px; font-size: 0.75rem; }

    /* Recruit */
    .recruit-grid { grid-template-columns: 1fr; gap: 24px; }
    .recruit-info { gap: 12px; }
    .recruit-item { padding: 16px; gap: 14px; }
    .recruit-icon { font-size: 1.6rem; }
    .recruit-item h4 { font-size: 0.95rem; }
    .recruit-item p { font-size: 0.9rem; }
    .cta-card { padding: 24px; position: static; }
    .qr-box { width: 140px; height: 140px; font-size: 0.78rem; }
    .platform-links { grid-template-columns: 1fr 1fr; gap: 8px; }
    .platform-link { padding: 12px 14px; font-size: 0.85rem; }

    /* Culture */
    .culture-grid { grid-template-columns: repeat(2, 1fr); gap: 14px; }
    .culture-card { padding: 22px 16px; }
    .culture-emoji { font-size: 2rem; }

    /* Recruit Flow */
    .flow-step { padding: 8px 12px; font-size: 0.85rem; }
    .flow-num { width: 24px; height: 24px; font-size: 0.7rem; }
    .expect-list li { font-size: 0.85rem; }

    /* Repair */
    .repair-grid { grid-template-columns: 1fr; gap: 14px; }
    .repair-card { padding: 28px 20px; }
    .repair-icon-wrap { width: 60px; height: 60px; }
    .repair-icon { font-size: 1.6rem; }
    .repair-value { font-size: 1.1rem; }
    .scope-tags { flex-direction: column; align-items: center; }
    .scope-tag { font-size: 0.85rem; text-align: left; }

    /* Footer */
    .footer { padding: 40px 0 20px; }
    .footer-inner { flex-direction: column; text-align: center; gap: 20px; }
    .footer-links { justify-content: center; gap: 16px; }
    .footer-links a { font-size: 0.85rem; }
    .footer-logo-img { height: 28px; }

    /* Back to top */
    .back-to-top { bottom: 20px; right: 20px; width: 44px; height: 44px; }
}

/* ========== 小手机 (≤480px) ========== */
@media (max-width: 480px) {
    .container { padding: 0 14px; }
    .hero { padding: 80px 0 44px; }
    .hero-logo { height: 60px; }
    .hero-title { font-size: 1.7rem; }
    .hero-stats { flex-direction: column; gap: 12px; }
    .stat-number { font-size: 1.6rem; }
    .section { padding: 44px 0; }
    .section-title { font-size: 1.4rem; }
    .service-card, .group-card, .repair-card { padding: 22px 16px; }
    .group-features li { font-size: 0.85rem; }
    .timeline-item { padding-left: 48px; }
    .honor-awards { flex-direction: column; align-items: flex-start; }
    .platform-links { grid-template-columns: 1fr; }
    .culture-grid { grid-template-columns: 1fr; }
    .about-intro p { font-size: 0.95rem; }
    .qr-box { width: 120px; height: 120px; }
}