/* ===== 全局变量 ===== */
:root {
    --primary: #00d4ff;
    --primary-dark: #0099cc;
    --accent: #7b2dff;
    --accent-light: #a855f7;
    --bg-dark: #0a0a0f;
    --bg-card: #111118;
    --bg-card-hover: #1a1a24;
    --bg-elevated: #15151e;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --text-muted: #606070;
    --border: #1f1f2e;
    --border-light: #2a2a3e;
    --gradient-primary: linear-gradient(135deg, #00d4ff 0%, #7b2dff 100%);
    --gradient-glow: linear-gradient(135deg, rgba(0,212,255,0.15) 0%, rgba(123,45,255,0.15) 100%);
    --shadow-glow: 0 0 40px rgba(0,212,255,0.15);
    --shadow-card: 0 8px 32px rgba(0,0,0,0.4);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
    font-family: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
    background: var(--bg-dark); color: var(--text-primary);
    line-height: 1.6; overflow-x: hidden; -webkit-font-smoothing: antialiased;
}
a { text-decoration: none; color: inherit; transition: var(--transition); }
img { max-width: 100%; display: block; }
ul { list-style: none; }

::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg-dark); }
::-webkit-scrollbar-thumb { background: var(--border-light); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--primary); }

#particles-canvas {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    z-index: 0; pointer-events: none;
}

.navbar {
    position: fixed; top: 0; left: 0; width: 100%; z-index: 1000;
    padding: 0 60px; height: 70px; display: flex; align-items: center;
    justify-content: space-between;
    background: rgba(10, 10, 15, 0.8); backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border); transition: var(--transition);
}
.navbar.scrolled { background: rgba(10, 10, 15, 0.95); box-shadow: 0 4px 30px rgba(0,0,0,0.3); }

.logo { display: flex; align-items: center; gap: 12px; font-size: 1.3rem; font-weight: 700; letter-spacing: 1px; }
.logo-icon {
    width: 40px; height: 40px; background: var(--gradient-primary);
    border-radius: 10px; display: flex; align-items: center; justify-content: center;
    font-size: 1.2rem; color: white;
}
.logo-text {
    background: var(--gradient-primary); -webkit-background-clip: text;
    -webkit-text-fill-color: transparent; background-clip: text;
}

.nav-links { display: flex; gap: 40px; }
.nav-links a {
    font-size: 0.9rem; font-weight: 500; color: var(--text-secondary);
    position: relative; padding: 5px 0;
}
.nav-links a::after {
    content: ''; position: absolute; bottom: 0; left: 0; width: 0; height: 2px;
    background: var(--gradient-primary); transition: var(--transition);
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.nav-links a:hover::after, .nav-links a.active::after { width: 100%; }

.nav-cta {
    padding: 10px 28px; background: var(--gradient-primary); border-radius: 8px;
    font-size: 0.85rem; font-weight: 600; color: white; border: none;
    cursor: pointer; transition: var(--transition);
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: var(--shadow-glow); }

.mobile-menu-btn { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 5px; }
.mobile-menu-btn span { display: block; width: 24px; height: 2px; background: var(--text-primary); transition: var(--transition); }

/* ===== Hero — 视频背景 + 点击切换 ===== */
.hero {
    position: relative; min-height: 100vh; display: flex; align-items: center;
    justify-content: center; overflow: hidden; padding-top: 70px;
}
.hero-bg {
    position: absolute; inset: 0; z-index: 1;
    background:
        radial-gradient(ellipse at 30% 30%, rgba(0,212,255,0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 70%, rgba(123,45,255,0.06) 0%, transparent 50%),
        radial-gradient(ellipse at 50% 50%, rgba(0,212,255,0.03) 0%, transparent 60%);
    pointer-events: none;
}
.hero-grid {
    position: absolute; inset: 0; z-index: 1;
    background-image:
        linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
    background-size: 80px 80px;
    mask-image: radial-gradient(ellipse at center, black 25%, transparent 65%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 25%, transparent 65%);
    pointer-events: none;
}
.hero-content {
    position: relative; z-index: 3; text-align: center;
    max-width: 800px; padding: 0 20px;
    pointer-events: none;
}
.hero-content .hero-buttons,
.hero-content .hero-buttons a {
    pointer-events: auto;
}
.hero-title {
    font-size: clamp(2.8rem, 6.5vw, 4.8rem); font-weight: 800;
    line-height: 1.15; margin-bottom: 28px; letter-spacing: -0.02em;
}
.hero-title .gradient-text {
    background: var(--gradient-primary); -webkit-background-clip: text;
    -webkit-text-fill-color: transparent; background-clip: text;
}
/* 英文模式下 hero 标题调小（英文句子更长） */
html[lang="en"] .hero-title { font-size: clamp(1.8rem, 4.2vw, 3.2rem); line-height: 1.2; }
.hero-subtitle {
    font-size: clamp(1.05rem, 2vw, 1.25rem); color: var(--text-secondary);
    max-width: 560px; margin: 0 auto 44px; line-height: 1.7;
}
.hero-buttons { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }
.hero-tagline {
    margin-top: 48px; font-size: 0.8rem; color: var(--text-muted);
    letter-spacing: 3px; text-transform: uppercase;
}

/* Buttons */
.btn-primary {
    padding: 14px 38px; background: var(--gradient-primary); border-radius: 10px;
    font-size: 0.95rem; font-weight: 600; color: white; border: none; cursor: pointer;
    transition: var(--transition); display: inline-flex; align-items: center; gap: 8px;
    letter-spacing: 0.01em;
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 0 50px rgba(0,212,255,0.3); }
.btn-outline {
    padding: 14px 38px; background: transparent; border: 1px solid rgba(255,255,255,0.2);
    border-radius: 10px; font-size: 0.95rem; font-weight: 500; color: var(--text-primary);
    cursor: pointer; transition: var(--transition); display: inline-flex; align-items: center; gap: 8px;
    letter-spacing: 0.01em;
}
.btn-outline:hover {
    border-color: rgba(255,255,255,0.5); background: rgba(255,255,255,0.04);
    transform: translateY(-2px);
}
.btn-secondary {
    padding: 14px 36px; background: transparent; border: 1px solid var(--border-light);
    border-radius: 10px; font-size: 1rem; font-weight: 600; color: var(--text-primary);
    cursor: pointer; transition: var(--transition); display: inline-flex; align-items: center; gap: 8px;
}
.btn-secondary:hover { border-color: var(--primary); background: rgba(0,212,255,0.05); }

/* Card link */
.card-link {
    display: inline-flex; align-items: center; gap: 6px;
    font-size: 0.85rem; font-weight: 600; color: var(--primary);
    margin-top: 16px; transition: var(--transition);
}
.card-link:hover { gap: 10px; color: #fff; }

/* ===== 产品平台横幅 — Lightwheel 风格 ===== */
.platform-banner {
    position: relative; z-index: 2; padding: 60px 0 80px;
    background: var(--bg-dark); overflow: hidden;
}
.platform-banner-bg {
    position: absolute; inset: 0; z-index: 0;
    background: linear-gradient(180deg, var(--bg-card) 0%, var(--bg-dark) 100%);
}
.platform-banner-grid {
    position: absolute; inset: 0; z-index: 0; opacity: 0.4;
    background-image:
        linear-gradient(rgba(0,212,255,0.04) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,212,255,0.04) 1px, transparent 1px);
    background-size: 60px 60px;
    mask-image: radial-gradient(ellipse at center, black 0%, transparent 75%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 75%);
}
.platform-banner-glow {
    position: absolute; border-radius: 50%; filter: blur(100px); pointer-events: none; z-index: 0;
}
.platform-banner-glow-1 {
    width: 500px; height: 500px;
    background: radial-gradient(circle, rgba(0,212,255,0.18) 0%, transparent 70%);
    top: 20%; left: -10%;
}
.platform-banner-glow-2 {
    width: 400px; height: 400px;
    background: radial-gradient(circle, rgba(123,45,255,0.18) 0%, transparent 70%);
    bottom: -10%; right: -5%;
}
.platform-banner-inner {
    position: relative; z-index: 1;
    border-radius: 24px; overflow: hidden;
    background:
        linear-gradient(135deg, rgba(17,17,24,0.9) 0%, rgba(21,21,30,0.9) 100%);
    border: 1px solid var(--border);
    box-shadow: 0 30px 80px rgba(0,0,0,0.4);
    min-height: 380px;
    display: flex; flex-direction: column; justify-content: flex-end;
    padding: 0;
    transition: var(--transition);
}
.platform-banner-inner:hover {
    border-color: rgba(0,212,255,0.3);
    box-shadow: 0 30px 80px rgba(0,212,255,0.1);
}
.platform-banner-inner::before {
    content: ''; position: absolute; inset: 0; z-index: 0;
    background:
        radial-gradient(ellipse at 80% 30%, rgba(123,45,255,0.12) 0%, transparent 50%),
        radial-gradient(ellipse at 20% 80%, rgba(0,212,255,0.1) 0%, transparent 50%);
    pointer-events: none;
}
.platform-banner-tag {
    position: absolute; top: 24px; right: 24px; z-index: 2;
    display: inline-flex; align-items: center; gap: 8px;
    padding: 8px 18px;
    background: rgba(255,255,255,0.06);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 50px; backdrop-filter: blur(10px);
    font-size: 0.8rem; font-weight: 500; color: var(--text-primary);
    letter-spacing: 0.5px;
}
.platform-tag-dot {
    width: 6px; height: 6px; border-radius: 50%;
    background: var(--primary);
    box-shadow: 0 0 10px var(--primary);
    animation: pulse 2s ease-in-out infinite;
}
.platform-banner-content {
    position: relative; z-index: 1;
    padding: 60px 50px 50px;
    max-width: 700px;
}
.platform-banner-title {
    font-size: clamp(2rem, 4vw, 3rem); font-weight: 700;
    line-height: 1.15; margin-bottom: 18px; letter-spacing: -0.02em;
    color: var(--text-primary);
}
.platform-banner-title-accent {
    background: var(--gradient-primary);
    -webkit-background-clip: text; -webkit-text-fill-color: transparent;
    background-clip: text;
}
.platform-banner-desc {
    font-size: 1.05rem; color: var(--text-secondary);
    line-height: 1.7; margin-bottom: 32px; max-width: 560px;
}
.platform-banner-cta {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 12px 24px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 50px;
    font-size: 0.9rem; font-weight: 500; color: var(--text-primary);
    transition: var(--transition); backdrop-filter: blur(10px);
}
.platform-banner-cta:hover {
    background: var(--primary); border-color: var(--primary);
    transform: translateY(-2px); box-shadow: 0 0 30px rgba(0,212,255,0.4);
}
.platform-banner-arrow {
    display: inline-block;
    transition: transform 0.3s ease;
}
.platform-banner-cta:hover .platform-banner-arrow { transform: translateX(4px); }

@media (max-width: 768px) {
    .platform-banner-content { padding: 100px 30px 40px; }
    .platform-banner-tag { top: 16px; right: 16px; font-size: 0.7rem; padding: 6px 14px; }
}

.data-bar { position: relative; z-index: 2; background: var(--bg-card); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); padding: 50px 0; }
.data-bar-inner { max-width: 1200px; margin: 0 auto; padding: 0 20px; display: grid; grid-template-columns: repeat(4, 1fr); gap: 40px; }
.data-item { text-align: center; position: relative; }
.data-item:not(:last-child)::after {
    content: ''; position: absolute; right: -20px; top: 50%; transform: translateY(-50%);
    width: 1px; height: 50px; background: var(--border);
}
.data-number { font-size: 2.5rem; font-weight: 800; background: var(--gradient-primary); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; line-height: 1; }
.data-label { font-size: 0.85rem; color: var(--text-secondary); margin-top: 8px; }

/* ===== Trusted By — Lightwheel 风格 ===== */
.trusted-section { padding-top: 60px; padding-bottom: 80px; }
.trusted-section .section-header { margin-bottom: 40px; }
.trusted-section .section-title { font-size: 1.5rem; font-weight: 600; }
.trusted-grid {
    display: grid; grid-template-columns: repeat(6, 1fr); gap: 24px;
}
.trusted-logo {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: 12px; height: 80px; display: flex; align-items: center;
    justify-content: center; transition: var(--transition); position: relative; overflow: hidden;
}
.trusted-logo::before {
    content: ''; position: absolute; inset: 0;
    background: radial-gradient(circle at center, rgba(0,212,255,0.06) 0%, transparent 70%);
    opacity: 0; transition: opacity 0.4s;
}
.trusted-logo:hover {
    border-color: var(--border-light); transform: translateY(-4px);
    box-shadow: 0 12px 40px rgba(0,0,0,0.3);
}
.trusted-logo:hover::before { opacity: 1; }
.trusted-logo-text {
    font-size: 1rem; font-weight: 700; color: var(--text-secondary);
    letter-spacing: 1px; position: relative; z-index: 1; transition: var(--transition);
}
.trusted-logo:hover .trusted-logo-text { color: var(--text-primary); }

.section { position: relative; z-index: 2; padding: 100px 0; }
.section-header { text-align: center; max-width: 700px; margin: 0 auto 60px; padding: 0 20px; }
.section-tag {
    display: inline-block; padding: 6px 16px; background: rgba(0,212,255,0.1);
    border: 1px solid rgba(0,212,255,0.2); border-radius: 50px;
    font-size: 0.8rem; color: var(--primary); margin-bottom: 16px;
    text-transform: uppercase; letter-spacing: 2px;
}
.section-title { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 700; margin-bottom: 16px; line-height: 1.2; }
.section-desc { font-size: 1rem; color: var(--text-secondary); line-height: 1.8; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

.services-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.service-card {
    background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px;
    padding: 36px 28px; transition: var(--transition); position: relative;
    display: flex; flex-direction: column;
}
.service-card:hover {
    transform: translateY(-6px); border-color: var(--border-light);
    box-shadow: 0 20px 50px rgba(0,0,0,0.3); background: var(--bg-card-hover);
}
.service-icon {
    width: 48px; height: 48px; background: rgba(0,212,255,0.08); border-radius: 12px;
    display: flex; align-items: center; justify-content: center;
    margin-bottom: 20px; color: var(--primary);
    border: 1px solid rgba(0,212,255,0.12);
}
.service-card h3 {
    font-size: 1.1rem; font-weight: 600; margin-bottom: 10px; line-height: 1.3;
}
.service-card p {
    font-size: 0.88rem; color: var(--text-secondary); line-height: 1.7;
    flex: 1;
}
.service-card .card-link { margin-top: auto; padding-top: 16px; }

.solutions-section { background: var(--bg-elevated); }
.solutions-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.solution-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 20px; overflow: hidden; transition: var(--transition); display: flex; flex-direction: column; }
.solution-card:hover { transform: translateY(-6px); border-color: var(--border-light); box-shadow: 0 20px 50px rgba(0,0,0,0.3); }
.solution-img {
    height: 180px; background: linear-gradient(135deg, rgba(0,212,255,0.08), rgba(123,45,255,0.06));
    display: flex; align-items: center; justify-content: center; font-size: 3rem;
    position: relative; overflow: hidden;
}
.solution-img::after { content: ''; position: absolute; inset: 0; background: linear-gradient(to bottom, transparent 50%, var(--bg-card) 100%); }
.solution-content { padding: 28px; display: flex; flex-direction: column; flex: 1; }
.solution-content h3 { font-size: 1.25rem; font-weight: 600; margin-bottom: 8px; }
.solution-content p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 16px; flex: 1; }
.solution-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 16px; }
.solution-tag { padding: 4px 12px; background: rgba(0,212,255,0.08); border: 1px solid rgba(0,212,255,0.15); border-radius: 20px; font-size: 0.75rem; color: var(--primary); }
.solution-content .card-link { margin-top: 0; }

.tech-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.tech-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px; padding: 32px; display: flex; gap: 20px; transition: var(--transition); align-items: flex-start; }
.tech-card:hover { border-color: var(--border-light); background: var(--bg-card-hover); transform: translateY(-4px); box-shadow: 0 12px 40px rgba(0,0,0,0.2); }
.tech-icon { width: 52px; height: 52px; min-width: 52px; background: rgba(0,212,255,0.08); border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 1.3rem; border: 1px solid rgba(0,212,255,0.12); }
.tech-info h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
.tech-info p { font-size: 0.88rem; color: var(--text-secondary); line-height: 1.7; }
.tech-highlight { display: inline-block; margin-top: 12px; padding: 4px 14px; background: rgba(0,212,255,0.1); border-radius: 6px; font-size: 0.85rem; color: var(--primary); font-weight: 600; }

.clients-section { background: var(--bg-elevated); }
.clients-grid { display: grid; grid-template-columns: repeat(6, 1fr); gap: 20px; margin-bottom: 60px; }
.client-logo { background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; height: 80px; display: flex; align-items: center; justify-content: center; font-size: 1.1rem; font-weight: 700; color: var(--text-secondary); transition: var(--transition); cursor: pointer; }
.client-logo:hover { border-color: var(--primary); color: var(--primary); transform: translateY(-4px); box-shadow: 0 10px 30px rgba(0,212,255,0.1); }

.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.about-visual-inner { background: var(--bg-card); border: 1px solid var(--border); border-radius: 20px; padding: 40px; position: relative; overflow: hidden; }
.about-visual-inner::before { content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%; background: radial-gradient(circle, rgba(0,212,255,0.05) 0%, transparent 60%); animation: rotate 30s linear infinite; }
.about-visual-content { position: relative; z-index: 1; }
.about-visual-content h3 { font-size: 1.5rem; margin-bottom: 20px; }
.timeline-item { display: flex; gap: 16px; align-items: flex-start; margin-bottom: 20px; }
.timeline-dot { width: 12px; height: 12px; min-width: 12px; background: var(--gradient-primary); border-radius: 50%; margin-top: 6px; position: relative; }
.timeline-dot::after { content: ''; position: absolute; top: 12px; left: 50%; transform: translateX(-50%); width: 2px; height: 40px; background: var(--border); }
.timeline-item:last-child .timeline-dot::after { display: none; }
.timeline-content h4 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
.timeline-content p { font-size: 0.85rem; color: var(--text-secondary); }
.about-text h2 { font-size: 2.2rem; font-weight: 700; margin-bottom: 20px; line-height: 1.3; }
.about-text > p { color: var(--text-secondary); margin-bottom: 30px; line-height: 1.8; }
.about-features { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.about-feature { display: flex; gap: 12px; align-items: flex-start; }
.about-feature-icon { width: 40px; height: 40px; min-width: 40px; background: var(--gradient-glow); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 1rem; }
.about-feature h4 { font-size: 0.95rem; font-weight: 600; margin-bottom: 4px; }
.about-feature p { font-size: 0.8rem; color: var(--text-secondary); }

/* ===== CTA — Lightwheel 风格 ===== */
.cta-section { position: relative; padding: 140px 0; overflow: hidden; }
.cta-bg {
    position: absolute; inset: 0;
    background: radial-gradient(ellipse at center, rgba(0,212,255,0.06) 0%, transparent 70%);
}
.cta-content { position: relative; z-index: 2; text-align: center; max-width: 650px; margin: 0 auto; padding: 0 20px; }
.cta-content h2 { font-size: clamp(2rem, 4vw, 2.8rem); font-weight: 700; margin-bottom: 18px; line-height: 1.2; }
.cta-content p { font-size: 1.05rem; color: var(--text-secondary); margin-bottom: 40px; line-height: 1.7; }

/* CTA video (removed from usage) */
.cta-video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: 0; opacity: 0.3; }

.footer { background: var(--bg-elevated); border-top: 1px solid var(--border); padding: 80px 0 30px; position: relative; z-index: 2; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 50px; margin-bottom: 60px; }
.footer-brand .logo { margin-bottom: 20px; }
.footer-brand p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 20px; }
.footer-social { display: flex; gap: 12px; }
.footer-social a { width: 40px; height: 40px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 1rem; transition: var(--transition); }
.footer-social a:hover { background: var(--gradient-primary); border-color: transparent; transform: translateY(-3px); }
.footer-col h4 { font-size: 1rem; font-weight: 600; margin-bottom: 20px; color: var(--text-primary); }
.footer-col ul li { margin-bottom: 12px; }
.footer-col ul li a { font-size: 0.9rem; color: var(--text-secondary); transition: var(--transition); }
.footer-col ul li a:hover { color: var(--primary); padding-left: 4px; }
.footer-bottom { border-top: 1px solid var(--border); padding-top: 30px; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 20px; }
.footer-bottom p { font-size: 0.85rem; color: var(--text-muted); }

@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes fadeInDown { from { opacity: 0; transform: translateY(-20px); } to { opacity: 1; transform: translateY(0); } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.5; } }
@keyframes rotate { from { transform: translate(-50%, -50%) rotate(0deg); } to { transform: translate(-50%, -50%) rotate(360deg); } }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-20px); } }
@keyframes spin { to { transform: rotate(360deg); } }

.reveal { opacity: 0; transform: translateY(40px); transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1); }
.reveal.active { opacity: 1; transform: translateY(0); }

.page-transition { position: fixed; inset: 0; background: var(--bg-dark); z-index: 9999; display: flex; align-items: center; justify-content: center; transition: opacity 0.5s ease; }
.page-transition.hidden { opacity: 0; pointer-events: none; }
.loader { width: 48px; height: 48px; border: 3px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin 1s linear infinite; }

/* ===== 子页面通用 ===== */
.page-hero { padding-top: 140px; padding-bottom: 60px; text-align: center; }
.page-hero h1 { font-size: clamp(2rem, 5vw, 3.5rem); font-weight: 800; margin-bottom: 16px; }
.page-hero p { font-size: 1.1rem; color: var(--text-secondary); max-width: 600px; margin: 0 auto; }

/* ===== 服务页面 ===== */
.service-detail-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 30px; }
.service-detail-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 20px; padding: 40px; transition: var(--transition); }
.service-detail-card:hover { border-color: var(--primary); transform: translateY(-4px); }
.icon-large { width: 70px; height: 70px; background: var(--gradient-glow); border-radius: 16px; display: flex; align-items: center; justify-content: center; font-size: 2rem; margin-bottom: 24px; border: 1px solid rgba(0,212,255,0.1); }
.service-detail-card h3 { font-size: 1.4rem; font-weight: 600; margin-bottom: 12px; }
.service-detail-card p { color: var(--text-secondary); line-height: 1.7; margin-bottom: 20px; }
.service-features-list { display: flex; flex-direction: column; gap: 10px; }
.service-features-list li { display: flex; align-items: center; gap: 10px; font-size: 0.9rem; color: var(--text-secondary); }
.service-features-list li::before { content: '✓'; color: var(--primary); font-weight: 700; }

/* ===== 解决方案页面 ===== */
.solution-category { margin-bottom: 80px; }
.solution-category-header { display: flex; align-items: center; gap: 16px; margin-bottom: 30px; }
.solution-category-header .icon { width: 50px; height: 50px; background: var(--gradient-glow); border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; }
.solution-category-header h3 { font-size: 1.5rem; font-weight: 600; }
.solution-category-header p { color: var(--text-secondary); font-size: 0.9rem; }

/* ===== 关于页面 ===== */
.about-values-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; margin-top: 60px; }
.about-value-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 16px; padding: 40px 30px; text-align: center; transition: var(--transition); }
.about-value-card:hover { border-color: var(--primary); transform: translateY(-6px); }
.value-icon { width: 60px; height: 60px; background: var(--gradient-glow); border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 1.5rem; margin: 0 auto 20px; }
.about-value-card h4 { font-size: 1.2rem; font-weight: 600; margin-bottom: 10px; }
.about-value-card p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; }

.timeline { position: relative; padding-left: 30px; }
.timeline::before { content: ''; position: absolute; left: 0; top: 0; bottom: 0; width: 2px; background: var(--gradient-primary); }
.timeline-node { position: relative; padding-bottom: 50px; }
.timeline-node:last-child { padding-bottom: 0; }
.timeline-node::before { content: ''; position: absolute; left: -36px; top: 4px; width: 14px; height: 14px; background: var(--bg-dark); border: 3px solid var(--primary); border-radius: 50%; }
.timeline-year { font-size: 0.85rem; color: var(--primary); font-weight: 600; margin-bottom: 8px; }
.timeline-title { font-size: 1.2rem; font-weight: 600; margin-bottom: 8px; }
.timeline-desc { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; }

/* ===== 案例页面 ===== */
.case-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.case-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 20px; overflow: hidden; transition: var(--transition); }
.case-card:hover { border-color: var(--primary); transform: translateY(-6px); box-shadow: 0 20px 60px rgba(0,212,255,0.1); }
.case-card-img { height: 180px; background: var(--gradient-glow); display: flex; align-items: center; justify-content: center; font-size: 2.5rem; }
.case-card-content { padding: 30px; }
.case-card-content h3 { font-size: 1.2rem; font-weight: 600; margin-bottom: 10px; }
.case-card-content p { font-size: 0.9rem; color: var(--text-secondary); line-height: 1.7; margin-bottom: 16px; }
.case-card-stats { display: flex; gap: 20px; padding-top: 16px; border-top: 1px solid var(--border); }
.case-stat { text-align: center; }
.case-stat-value { font-size: 1.3rem; font-weight: 700; color: var(--primary); }
.case-stat-label { font-size: 0.75rem; color: var(--text-muted); margin-top: 2px; }

/* ===== 联系页面 ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start; }
.contact-info-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: 20px; padding: 40px; }
.contact-info-item { display: flex; gap: 16px; margin-bottom: 30px; }
.contact-info-item:last-child { margin-bottom: 0; }
.contact-info-icon { width: 50px; height: 50px; min-width: 50px; background: var(--gradient-glow); border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 1.2rem; }
.contact-info-text h4 { font-size: 1rem; font-weight: 600; margin-bottom: 4px; }
.contact-info-text p { font-size: 0.9rem; color: var(--text-secondary); }
.contact-form { background: var(--bg-card); border: 1px solid var(--border); border-radius: 20px; padding: 40px; }
.form-group { margin-bottom: 24px; }
.form-group label { display: block; font-size: 0.9rem; font-weight: 500; margin-bottom: 8px; color: var(--text-secondary); }
.form-group input, .form-group textarea, .form-group select { width: 100%; padding: 14px 18px; background: var(--bg-dark); border: 1px solid var(--border); border-radius: 10px; color: var(--text-primary); font-size: 0.95rem; font-family: inherit; transition: var(--transition); }
.form-group input:focus, .form-group textarea:focus, .form-group select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(0,212,255,0.1); }
.form-group textarea { min-height: 120px; resize: vertical; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }

/* ===== 移动端菜单 ===== */
.mobile-menu { position: fixed; top: 0; right: -100%; width: 80%; max-width: 350px; height: 100vh; background: var(--bg-card); border-left: 1px solid var(--border); z-index: 1001; padding: 80px 30px 30px; transition: right 0.3s ease; }
.mobile-menu.active { right: 0; }
.mobile-menu-overlay { position: fixed; inset: 0; background: rgba(0,0,0,0.5); z-index: 1000; opacity: 0; pointer-events: none; transition: opacity 0.3s ease; }
.mobile-menu-overlay.active { opacity: 1; pointer-events: all; }
.mobile-menu a { display: block; padding: 16px 0; font-size: 1.1rem; font-weight: 500; border-bottom: 1px solid var(--border); color: var(--text-secondary); }
.mobile-menu a:hover { color: var(--primary); }

.glow-orb { position: absolute; border-radius: 50%; filter: blur(80px); opacity: 0.3; pointer-events: none; }
.glow-orb-1 { width: 400px; height: 400px; background: rgba(0,212,255,0.2); top: 10%; left: -10%; animation: float 8s ease-in-out infinite; }
.glow-orb-2 { width: 300px; height: 300px; background: rgba(123,45,255,0.2); bottom: 20%; right: -5%; animation: float 10s ease-in-out infinite 2s; }

.back-to-top { position: fixed; bottom: 30px; right: 30px; width: 48px; height: 48px; background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px; display: flex; align-items: center; justify-content: center; cursor: pointer; z-index: 100; opacity: 0; transform: translateY(20px); transition: var(--transition); font-size: 1.2rem; }
.back-to-top.visible { opacity: 1; transform: translateY(0); }
.back-to-top:hover { background: var(--gradient-primary); border-color: transparent; color: white; }

/* ===== Hero 视频轮播展示卡片 ===== */
/* ===== Hero 视频背景轮播 ===== */
.hero-video-carousel {
    position: absolute; inset: 0; z-index: 0;
    background: var(--bg-dark); overflow: hidden;
}
.hero-video {
    position: absolute; top: 0; left: 0; width: 100%; height: 100%;
    object-fit: cover; opacity: 0;
    transition: opacity 1.4s cubic-bezier(0.4, 0, 0.2, 1);
    pointer-events: none;
}
.hero-video.active {
    opacity: 1;
    z-index: 1;
}
.hero-video-overlay {
    position: absolute; inset: 0; z-index: 2;
    background: rgba(10,10,15,0.6);
    cursor: pointer;
    transition: background 0.3s ease;
    pointer-events: none;
}
.hero-video-overlay:hover {
    background: linear-gradient(180deg, rgba(10,10,15,0.65) 0%, rgba(10,10,15,0.35) 50%, rgba(10,10,15,0.78) 100%);
}
.hero-video-hint {
    position: absolute;
    bottom: 90px; left: 50%;
    z-index: 4;
    padding: 10px 22px;
    background: rgba(0,0,0,0.4);
    border: 1px solid rgba(255,255,255,0.12);
    border-radius: 50px;
    backdrop-filter: blur(10px);
    font-size: 0.8rem;
    color: rgba(255,255,255,0.7);
    pointer-events: none;
    opacity: 0;
    transform: translateX(-50%) translateY(8px);
    transition: opacity 0.4s ease, transform 0.4s ease;
}
.hero-video-carousel:hover .hero-video-hint {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
}
.hero-video-indicators {
    position: absolute; bottom: 40px; left: 50%; transform: translateX(-50%);
    display: flex; gap: 10px; z-index: 5; pointer-events: auto;
}
.hero-video-dot {
    width: 32px; height: 4px; border-radius: 2px;
    background: rgba(255,255,255,0.2); cursor: pointer;
    transition: var(--transition); position: relative; border: none; padding: 0;
}
.hero-video-dot:hover {
    background: rgba(255,255,255,0.4);
}
.hero-video-dot.active {
    background: var(--primary); width: 48px; box-shadow: 0 0 12px rgba(0,212,255,0.5);
}
.hero-video-nav {
    position: absolute; top: 50%; transform: translateY(-50%);
    width: 48px; height: 48px; border-radius: 50%;
    background: rgba(255,255,255,0.08); border: 1px solid rgba(255,255,255,0.15);
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; z-index: 5; pointer-events: auto;
    transition: var(--transition); backdrop-filter: blur(8px);
    color: var(--text-secondary);
}
.hero-video-nav:hover {
    background: rgba(0,212,255,0.15); border-color: rgba(0,212,255,0.4);
    color: var(--primary); transform: translateY(-50%) scale(1.1);
}
.hero-video-nav-prev { left: 30px; }
.hero-video-nav-next { right: 30px; }
@media (max-width: 768px) {
    .hero-video-hint { display: none; }
    .hero-video-nav { width: 40px; height: 40px; }
    .hero-video-nav-prev { left: 16px; }
    .hero-video-nav-next { right: 16px; }
}
.section-video-wrapper {
    position: absolute; inset: 0; overflow: hidden; z-index: 0;
}
.section-video {
    position: absolute; top: 50%; left: 50%; min-width: 100%; min-height: 100%;
    width: auto; height: auto; transform: translate(-50%, -50%);
    object-fit: cover; opacity: 0.25;
}
.section-video-overlay {
    position: absolute; inset: 0; z-index: 1;
    background: linear-gradient(180deg, rgba(10,10,15,0.85) 0%, rgba(10,10,15,0.5) 50%, rgba(10,10,15,0.85) 100%);
}

/* ===== 三层架构区域 ===== */
.layers-section {
    position: relative; padding: 120px 0; overflow: hidden;
    background: var(--bg-dark);
}
.layers-section .container { position: relative; z-index: 3; }
.layers-header { text-align: center; max-width: 700px; margin: 0 auto 80px; }
.layers-header .section-tag { margin-bottom: 16px; }
.layers-header h2 { font-size: clamp(1.8rem, 4vw, 2.8rem); font-weight: 700; margin-bottom: 16px; }
.layers-header p { color: var(--text-secondary); font-size: 1rem; line-height: 1.8; }
.layers-grid { position: relative; }
.layers-connector {
    display: flex; flex-direction: column; align-items: center; gap: 0;
    position: relative;
}
.layer-node {
    display: grid; grid-template-columns: 1fr 1fr; gap: 60px;
    align-items: center; padding: 60px 40px; border-radius: 20px;
    background: rgba(17,17,24,0.7); backdrop-filter: blur(10px);
    border: 1px solid var(--border); transition: var(--transition);
    position: relative; overflow: hidden;
}
.layer-node:hover { border-color: var(--primary); transform: translateY(-4px); box-shadow: 0 20px 60px rgba(0,212,255,0.1); }
.layer-node::before {
    content: ''; position: absolute; top: -50%; left: -50%; width: 200%; height: 200%;
    background: radial-gradient(circle, rgba(0,212,255,0.03) 0%, transparent 60%);
    pointer-events: none;
}
.layer-number {
    position: absolute; top: 20px; right: 30px;
    font-size: 8rem; font-weight: 900; line-height: 1;
    background: var(--gradient-primary); -webkit-background-clip: text;
    -webkit-text-fill-color: transparent; background-clip: text;
    opacity: 0.08; pointer-events: none;
}
.layer-content h3 {
    font-size: 1.8rem; font-weight: 700; margin-bottom: 12px;
    color: var(--text-primary);
}
.layer-content .layer-subtitle {
    font-size: 0.95rem; color: var(--primary); font-weight: 600; margin-bottom: 16px;
}
.layer-content p {
    font-size: 0.95rem; color: var(--text-secondary); line-height: 1.8; margin-bottom: 24px;
}
.layer-features { display: flex; flex-direction: column; gap: 12px; }
.layer-feature {
    display: flex; align-items: center; gap: 12px;
    font-size: 0.9rem; color: var(--text-secondary);
    padding: 10px 16px; background: rgba(0,212,255,0.04);
    border-radius: 8px; border: 1px solid rgba(0,212,255,0.08);
    transition: var(--transition);
}
.layer-feature:hover { background: rgba(0,212,255,0.08); border-color: rgba(0,212,255,0.2); color: var(--text-primary); }
.layer-feature::before { content: '✦'; color: var(--primary); font-size: 0.7rem; }
.layer-visual {
    display: flex; align-items: center; justify-content: center;
    position: relative;
}
.layer-visual-inner {
    width: 200px; height: 200px; border-radius: 30px;
    background: var(--gradient-glow); display: flex;
    align-items: center; justify-content: center;
    border: 2px solid rgba(0,212,255,0.15);
    position: relative; animation: float 6s ease-in-out infinite;
    overflow: hidden;
}
.layer-visual-inner svg {
    width: 90px; height: 90px;
    position: relative; z-index: 1;
    filter: drop-shadow(0 0 20px rgba(0,212,255,0.4));
}
.layer-visual-inner::after {
    content: ''; position: absolute; inset: -8px;
    border-radius: 38px; border: 1px solid rgba(0,212,255,0.1);
    animation: rotate 15s linear infinite;
}
.layer-visual-inner.delay-1 { animation-delay: 1s; }
.layer-visual-inner.delay-2 { animation-delay: 2s; }

/* 层级色彩编码 — Lightwheel 风格（青/蓝紫/紫品红） */
.layer-node[data-layer="1"] .layer-visual-inner {
    background: radial-gradient(circle, rgba(0,212,255,0.18) 0%, rgba(59,130,246,0.06) 70%, transparent 100%);
    border-color: rgba(0,212,255,0.3);
    box-shadow: 0 0 50px rgba(0,212,255,0.15);
}
.layer-node[data-layer="1"] .layer-visual-inner::after { border-color: rgba(0,212,255,0.2); }
.layer-node[data-layer="1"] .layer-visual-inner svg { filter: drop-shadow(0 0 20px rgba(0,212,255,0.5)); }
.layer-node[data-layer="1"]:hover { border-color: rgba(0,212,255,0.4); box-shadow: 0 20px 60px rgba(0,212,255,0.18); }

.layer-node[data-layer="2"] .layer-visual-inner {
    background: radial-gradient(circle, rgba(123,45,255,0.18) 0%, rgba(59,130,246,0.06) 70%, transparent 100%);
    border-color: rgba(123,45,255,0.3);
    box-shadow: 0 0 50px rgba(123,45,255,0.15);
}
.layer-node[data-layer="2"] .layer-visual-inner::after { border-color: rgba(123,45,255,0.2); }
.layer-node[data-layer="2"] .layer-visual-inner svg { filter: drop-shadow(0 0 20px rgba(123,45,255,0.5)); }
.layer-node[data-layer="2"]:hover { border-color: rgba(123,45,255,0.4); box-shadow: 0 20px 60px rgba(123,45,255,0.18); }

.layer-node[data-layer="3"] .layer-visual-inner {
    background: radial-gradient(circle, rgba(232,121,249,0.18) 0%, rgba(123,45,255,0.06) 70%, transparent 100%);
    border-color: rgba(232,121,249,0.3);
    box-shadow: 0 0 50px rgba(232,121,249,0.15);
}
.layer-node[data-layer="3"] .layer-visual-inner::after { border-color: rgba(232,121,249,0.2); }
.layer-node[data-layer="3"] .layer-visual-inner svg { filter: drop-shadow(0 0 20px rgba(232,121,249,0.5)); }
.layer-node[data-layer="3"]:hover { border-color: rgba(232,121,249,0.4); box-shadow: 0 20px 60px rgba(232,121,249,0.18); }
.layer-visual-inner.delay-1 { animation-delay: 1s; }
.layer-visual-inner.delay-2 { animation-delay: 2s; }
.layer-arrow {
    text-align: center; padding: 10px 0; position: relative; z-index: 5;
}
.layer-arrow svg { width: 32px; height: 32px; stroke: var(--primary); opacity: 0.6; animation: pulse 2s infinite; }

/* ===== CTA 视频背景 ===== */
.cta-video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; z-index: 0; opacity: 0.3; }
.cta-section { position: relative; overflow: hidden; }

/* ===== 视频展示区 ===== */
.video-section { position: relative; z-index: 2; padding: 100px 0; background: var(--bg-elevated); }
.video-section::before {
    content: ''; position: absolute; inset: 0; z-index: 0;
    background-image:
        linear-gradient(rgba(0,212,255,0.015) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,212,255,0.015) 1px, transparent 1px);
    background-size: 80px 80px;
    pointer-events: none;
}
.video-section .container { position: relative; z-index: 1; }
.video-showcase-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 30px; }
.video-card {
    background: var(--bg-card); border: 1px solid var(--border);
    border-radius: 20px; overflow: hidden; transition: var(--transition);
    position: relative;
}
.video-card::after {
    content: ''; position: absolute; inset: 0; border-radius: 20px;
    pointer-events: none; z-index: 2;
    background: linear-gradient(180deg, transparent 60%, rgba(0,0,0,0.4) 100%);
    opacity: 0; transition: opacity 0.3s;
}
.video-card:hover { transform: translateY(-8px); border-color: var(--primary); box-shadow: 0 20px 60px rgba(0,212,255,0.15); }
.video-card:hover::after { opacity: 1; }
.video-card-media {
    position: relative; width: 100%; height: 220px; overflow: hidden;
    background: var(--gradient-glow);
}
.video-card-media iframe,
.video-card-media video {
    width: 100%; height: 100%; object-fit: cover; border: none;
}
.video-card-poster {
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    background: linear-gradient(135deg, rgba(0,212,255,0.08), rgba(123,45,255,0.08));
    cursor: pointer; transition: var(--transition);
}
.video-card-poster::before {
    content: ''; position: absolute; inset: 0;
    background: radial-gradient(ellipse at center, rgba(0,0,0,0.2) 0%, rgba(0,0,0,0.5) 100%);
}
.video-card-poster .play-icon {
    width: 64px; height: 64px; border-radius: 50%;
    background: rgba(255,255,255,0.15); backdrop-filter: blur(10px);
    border: 2px solid rgba(255,255,255,0.3);
    display: flex; align-items: center; justify-content: center;
    transition: var(--transition); position: relative; z-index: 1;
}
.video-card-poster .play-icon::after {
    content: ''; display: block; width: 0; height: 0;
    border-style: solid;
    border-width: 12px 0 12px 20px;
    border-color: transparent transparent transparent white;
    margin-left: 4px;
}
.video-card:hover .video-card-poster .play-icon {
    background: var(--primary); border-color: var(--primary);
    transform: scale(1.1); box-shadow: 0 0 30px rgba(0,212,255,0.4);
}
.video-card-poster.playing { opacity: 0; pointer-events: none; }

/* 视频播放/暂停控制按钮（始终可点击） */
.video-card-media { position: relative; }
.video-card-media .video-control-btn {
    position: absolute; top: 12px; right: 12px;
    width: 40px; height: 40px; border-radius: 50%;
    background: rgba(0, 0, 0, 0.6);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; z-index: 5;
    pointer-events: auto;
    transition: opacity 0.3s ease, background 0.2s ease;
}
.video-card-media .video-control-btn:hover { background: rgba(0, 212, 255, 0.7); }
.video-card-media .video-control-btn svg { width: 18px; height: 18px; fill: white; }
.video-card-info { padding: 24px; }
.video-card-info h4 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
.video-card-info p { font-size: 0.85rem; color: var(--text-secondary); line-height: 1.7; }
.video-card-tag {
    display: inline-block; padding: 4px 12px;
    background: rgba(0,212,255,0.1);
    border: 1px solid rgba(0,212,255,0.2); border-radius: 20px;
    font-size: 0.75rem; color: var(--primary); margin-bottom: 12px;
}

/* 视频卡片色彩变化 */
.video-card[data-color="purple"] .video-card-tag {
    background: rgba(123,45,255,0.1);
    border-color: rgba(123,45,255,0.25); color: #a855f7;
}
.video-card[data-color="blue"] .video-card-tag {
    background: rgba(59,130,246,0.1);
    border-color: rgba(59,130,246,0.3); color: #60a5fa;
}

/* 第三张视频卡片高亮（参考截图1） */
.video-card-featured {
    border-color: rgba(0,212,255,0.5);
    box-shadow: 0 0 0 1px rgba(0,212,255,0.3), 0 20px 50px rgba(0,212,255,0.12);
    background:
        linear-gradient(180deg, rgba(0,212,255,0.04) 0%, var(--bg-card) 30%);
}
.video-card-featured::before {
    content: ''; position: absolute; inset: -1px; border-radius: 20px; z-index: 0;
    padding: 1px;
    background: linear-gradient(135deg, rgba(0,212,255,0.6) 0%, rgba(59,130,246,0.3) 50%, transparent 80%);
    -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    -webkit-mask-composite: xor; mask-composite: exclude;
    pointer-events: none;
}
.video-card-featured .video-card-poster {
    background: linear-gradient(135deg, rgba(0,212,255,0.12) 0%, rgba(59,130,246,0.08) 100%);
}
.video-card-featured .play-icon {
    background: rgba(0,212,255,0.25);
    border-color: var(--primary);
    box-shadow: 0 0 20px rgba(0,212,255,0.4);
    animation: pulse 2.4s ease-in-out infinite;
}
.video-card-featured:hover {
    border-color: var(--primary);
    box-shadow: 0 0 0 1px var(--primary), 0 25px 70px rgba(0,212,255,0.25);
    transform: translateY(-10px);
}

/* ===== 视频加载状态 ===== */
.video-loading {
    position: absolute; inset: 0;
    display: flex; align-items: center; justify-content: center;
    background: var(--bg-card);
}

/* ===== 关于我们 — 介绍视频 ===== */
.about-video-wrapper {
    max-width: 1000px; margin: 0 auto;
}
.about-video-player {
    position: relative; border-radius: 20px; overflow: hidden;
    border: 1px solid var(--border); background: var(--bg-card);
    box-shadow: 0 20px 60px rgba(0,0,0,0.4);
}
.about-video-player video {
    display: block; width: 100%; height: auto;
    aspect-ratio: 16 / 9; object-fit: cover;
}
/* Poster 封面层 */
.about-video-poster {
    position: absolute; inset: 0; z-index: 2;
    display: flex; align-items: center; justify-content: center;
    cursor: pointer; transition: opacity 0.5s ease;
}
.about-video-poster.hidden { opacity: 0; pointer-events: none; }
.about-video-poster-bg {
    position: absolute; inset: 0;
    background:
        radial-gradient(ellipse at 30% 40%, rgba(0,212,255,0.12) 0%, transparent 50%),
        radial-gradient(ellipse at 70% 60%, rgba(123,45,255,0.12) 0%, transparent 50%),
        linear-gradient(135deg, #0d0d14 0%, #15151e 100%);
}
.about-video-poster-bg::after {
    content: ''; position: absolute; inset: 0;
    background-image:
        linear-gradient(rgba(255,255,255,0.025) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255,255,255,0.025) 1px, transparent 1px);
    background-size: 50px 50px;
    mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
    -webkit-mask-image: radial-gradient(ellipse at center, black 20%, transparent 70%);
}
.about-video-play-btn {
    position: relative; z-index: 1;
    width: 80px; height: 80px; border-radius: 50%;
    background: rgba(0,212,255,0.15); border: 2px solid rgba(0,212,255,0.4);
    backdrop-filter: blur(12px); cursor: pointer;
    display: flex; align-items: center; justify-content: center;
    transition: var(--transition);
}
.about-video-play-btn:hover {
    background: var(--primary); border-color: var(--primary);
    transform: scale(1.12); box-shadow: 0 0 40px rgba(0,212,255,0.5);
}
.about-video-play-btn svg { margin-left: 4px; }
.about-video-poster-text {
    position: absolute; bottom: 30px; left: 0; right: 0;
    text-align: center; z-index: 1;
}
.about-video-poster-text span {
    font-size: 0.85rem; color: var(--text-secondary);
    letter-spacing: 2px; text-transform: uppercase;
}
/* 控制条 */
.about-video-controls {
    position: absolute; bottom: 0; left: 0; right: 0; z-index: 3;
    display: flex; align-items: center; gap: 14px;
    padding: 14px 20px;
    background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
    opacity: 0; transform: translateY(10px);
    transition: opacity 0.3s ease, transform 0.3s ease;
}
.about-video-player:hover .about-video-controls,
.about-video-controls.visible {
    opacity: 1; transform: translateY(0);
}
.about-video-ctrl-btn {
    background: none; border: none; cursor: pointer;
    color: rgba(255,255,255,0.8); padding: 4px;
    display: flex; align-items: center; justify-content: center;
    transition: var(--transition); flex-shrink: 0;
}
.about-video-ctrl-btn:hover { color: var(--primary); }
.about-video-progress {
    flex: 1; height: 4px; border-radius: 2px;
    background: rgba(255,255,255,0.15); cursor: pointer;
    position: relative; transition: height 0.2s ease;
}
.about-video-progress:hover { height: 6px; }
.about-video-progress-bar {
    height: 100%; border-radius: 2px;
    background: var(--gradient-primary); width: 0%;
    transition: width 0.1s linear;
}
.about-video-time {
    font-size: 0.75rem; color: rgba(255,255,255,0.7);
    font-variant-numeric: tabular-nums; white-space: nowrap; flex-shrink: 0;
}
@media (max-width: 768px) {
    .about-video-play-btn { width: 60px; height: 60px; }
    .about-video-controls { gap: 8px; padding: 10px 12px; }
    .about-video-time { display: none; }
}
.video-loading-spinner {
    width: 40px; height: 40px; border: 3px solid var(--border);
    border-top-color: var(--primary); border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
    .services-grid { grid-template-columns: repeat(2, 1fr); }
    .solutions-grid { grid-template-columns: repeat(2, 1fr); }
    .trusted-grid { grid-template-columns: repeat(3, 1fr); }
    .footer-grid { grid-template-columns: repeat(2, 1fr); }
    .about-grid { grid-template-columns: 1fr; }
    .contact-grid { grid-template-columns: 1fr; }
    .case-grid { grid-template-columns: repeat(2, 1fr); }
    .service-detail-grid { grid-template-columns: 1fr; }
    .about-values-grid { grid-template-columns: repeat(2, 1fr); }
    .layer-node { grid-template-columns: 1fr; gap: 40px; padding: 40px 30px; }
    .layer-visual { display: none; }
    .video-showcase-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
    .navbar { padding: 0 20px; }
    .nav-links, .nav-cta { display: none; }
    .mobile-menu-btn { display: flex; }
    .hero-title { font-size: clamp(2rem, 8vw, 3rem); }
    .data-bar-inner { grid-template-columns: repeat(2, 1fr); }
    .data-item:nth-child(2)::after { display: none; }
    .trusted-grid { grid-template-columns: repeat(2, 1fr); }
    .services-grid, .solutions-grid, .tech-grid, .footer-grid, .about-features, .case-grid, .about-values-grid, .video-showcase-grid { grid-template-columns: 1fr; }
    .hero-buttons { flex-direction: column; align-items: center; }
    .btn-primary, .btn-outline, .btn-secondary { width: 100%; max-width: 280px; justify-content: center; }
    .form-row { grid-template-columns: 1fr; }
    .page-hero { padding-top: 120px; }
}

/* ===== 科技感增强 - 滚动条指示器 ===== */
.section-tag {
    position: relative; overflow: hidden;
}
.section-tag::before {
    content: ''; position: absolute; top: 0; left: -100%;
    width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0,212,255,0.4), transparent);
    animation: shimmer 3s ease-in-out infinite;
}
@keyframes shimmer {
    0% { left: -100%; }
    50%, 100% { left: 100%; }
}

/* ===== 三层架构节点 — 装饰元素 ===== */
.layer-node::after {
    content: ''; position: absolute; top: 0; left: 0; right: 0; height: 1px; z-index: 1;
    background: linear-gradient(90deg, transparent, var(--primary), transparent);
    opacity: 0.3;
}
.layer-node[data-layer="1"]::after { background: linear-gradient(90deg, transparent, #00d4ff, transparent); }
.layer-node[data-layer="2"]::after { background: linear-gradient(90deg, transparent, #7b2dff, transparent); }
.layer-node[data-layer="3"]::after { background: linear-gradient(90deg, transparent, #e879f9, transparent); }

/* ===== CTA 增强 - 滚动指示器 ===== */
.cta-section::before {
    content: ''; position: absolute; top: 0; left: 50%; transform: translateX(-50%);
    width: 80%; max-width: 600px; height: 1px;
    background: linear-gradient(90deg, transparent, rgba(0,212,255,0.4), transparent);
    z-index: 3;
}

/* ===== 全局光标强调 ===== */
.btn-primary { position: relative; overflow: hidden; }
.btn-primary::before {
    content: ''; position: absolute; top: 0; left: -100%;
    width: 100%; height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.3), transparent);
    transition: left 0.5s ease;
}
.btn-primary:hover::before { left: 100%; }

/* ===== Hero 视频指示器 — 增强 ===== */
.hero-video-dot.active {
    box-shadow: 0 0 12px rgba(0,212,255,0.6), 0 0 20px rgba(0,212,255,0.3);
}

/* ===== 滚动平滑 + 选区颜色 ===== */
::selection { background: rgba(0,212,255,0.3); color: var(--text-primary); }
::-moz-selection { background: rgba(0,212,255,0.3); color: var(--text-primary); }

/* ===== 连续三个视频板块（Lightwheel 风格） ===== */
.video-layers-section {
    position: relative;
    z-index: 2;
    padding: 100px 0;
    background: var(--bg-dark);
    overflow: hidden;
}
.video-layers-section::before {
    content: '';
    position: absolute;
    inset: 0;
    background-image:
        linear-gradient(rgba(0,212,255,0.015) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0,212,255,0.015) 1px, transparent 1px);
    background-size: 80px 80px;
    pointer-events: none;
    z-index: 0;
}
.video-layers-section .container { position: relative; z-index: 1; }
.video-layers-grid {
    display: flex;
    flex-direction: column;
    gap: 40px;
}
.video-layer-card {
    position: relative;
    border-radius: 24px;
    overflow: hidden;
    min-height: 480px;
    border: 1px solid var(--border);
    box-shadow: 0 30px 80px rgba(0,0,0,0.4);
    transition: var(--transition);
}
.video-layer-card:hover {
    border-color: rgba(0,212,255,0.4);
    box-shadow: 0 30px 80px rgba(0,212,255,0.12);
    transform: translateY(-6px);
}
.video-layer-media {
    position: absolute;
    inset: 0;
    z-index: 0;
    background: var(--bg-card);
}
.video-layer-media video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.video-layer-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        180deg,
        rgba(10,10,15,0.35) 0%,
        rgba(10,10,15,0.2) 40%,
        rgba(10,10,15,0.85) 100%
    );
    z-index: 1;
}
.video-layer-tag {
    position: absolute;
    top: 24px;
    right: 24px;
    z-index: 3;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 8px 18px;
    background: rgba(255,255,255,0.08);
    border: 1px solid rgba(255,255,255,0.15);
    border-radius: 50px;
    backdrop-filter: blur(10px);
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-primary);
    letter-spacing: 0.5px;
}
.video-layer-content {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 3;
    padding: 50px;
    max-width: 650px;
}
.video-layer-content h3 {
    font-size: clamp(1.8rem, 3vw, 2.6rem);
    font-weight: 700;
    margin-bottom: 14px;
    line-height: 1.15;
}
.video-layer-content p {
    font-size: 1rem;
    color: rgba(255,255,255,0.75);
    line-height: 1.7;
    margin-bottom: 28px;
    max-width: 520px;
}
.video-layer-cta {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    border-radius: 50px;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-primary);
    transition: var(--transition);
    backdrop-filter: blur(10px);
}
.video-layer-cta:hover {
    background: var(--primary);
    border-color: var(--primary);
    transform: translateY(-2px);
    box-shadow: 0 0 30px rgba(0,212,255,0.4);
}
.video-layer-cta span {
    display: inline-block;
    transition: transform 0.3s ease;
}
.video-layer-cta:hover span { transform: translateX(4px); }

/* 层级色彩编码 */
.video-layer-card[data-layer="collection"]:hover { border-color: rgba(0,212,255,0.5); box-shadow: 0 30px 80px rgba(0,212,255,0.18); }
.video-layer-card[data-layer="annotation"]:hover { border-color: rgba(123,45,255,0.5); box-shadow: 0 30px 80px rgba(123,45,255,0.18); }
.video-layer-card[data-layer="evaluation"]:hover { border-color: rgba(232,121,249,0.5); box-shadow: 0 30px 80px rgba(232,121,249,0.18); }
.video-layer-card[data-layer="collection"] .video-layer-cta:hover { background: #00d4ff; border-color: #00d4ff; box-shadow: 0 0 30px rgba(0,212,255,0.5); }
.video-layer-card[data-layer="annotation"] .video-layer-cta:hover { background: #7b2dff; border-color: #7b2dff; box-shadow: 0 0 30px rgba(123,45,255,0.5); }
.video-layer-card[data-layer="evaluation"] .video-layer-cta:hover { background: #e879f9; border-color: #e879f9; box-shadow: 0 0 30px rgba(232,121,249,0.5); }

@media (max-width: 768px) {
    .video-layer-card { min-height: 420px; }
    .video-layer-content { padding: 30px; }
    .video-layer-tag { top: 16px; right: 16px; font-size: 0.7rem; padding: 6px 14px; }
}

/* ===== 双语切换器 Language Switcher ===== */
.lang-switch {
    display: flex; align-items: center; gap: 4px;
    padding: 4px 8px; margin-left: 24px;
    background: rgba(255,255,255,0.04);
    border: 1px solid var(--border-light, rgba(255,255,255,0.1));
    border-radius: 999px;
    transition: var(--transition, all 0.3s ease);
}
.lang-switch:hover { border-color: var(--primary, #00d4ff); }
.lang-switch button {
    background: transparent; border: none; cursor: pointer;
    color: var(--text-secondary, rgba(255,255,255,0.6)); font-size: 0.82rem; font-weight: 600;
    padding: 4px 12px; border-radius: 999px; line-height: 1;
    transition: var(--transition, all 0.3s ease); font-family: inherit;
}
.lang-switch button:hover { color: var(--text-primary, #fff); }
.lang-switch button.active {
    background: var(--gradient-primary, linear-gradient(135deg, #00d4ff, #0099ff)); color: #fff;
    box-shadow: 0 2px 12px rgba(0,212,255,0.35);
}
.lang-switch .lang-sep { color: var(--text-muted, rgba(255,255,255,0.3)); font-size: 0.75rem; user-select: none; }

/* 移动端菜单内的切换器 */
.mobile-menu .lang-switch {
    margin: 0 0 24px 0; align-self: flex-start;
    background: rgba(255,255,255,0.06);
}

@media (max-width: 968px) {
    .navbar > .lang-switch { display: flex; margin-left: auto; margin-right: 16px; }
}