/* ============================================================
 * 51cg精选视频 - Modern UI Stylesheet
 * Glassmorphism · Responsive · 高性能
 * ============================================================ */

:root {
    --c-bg-1: #0b0d1a;
    --c-bg-2: #1a1240;
    --c-bg-3: #2b0a4a;
    --c-text: #e9ecff;
    --c-muted: #9aa3c7;
    --c-accent-1: #ff3ea5;
    --c-accent-2: #3edcff;
    --c-accent-3: #b46bff;
    --c-glass: rgba(255, 255, 255, 0.07);
    --c-glass-strong: rgba(255, 255, 255, 0.14);
    --c-border: rgba(255, 255, 255, 0.14);
    --c-shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
    --r-md: 14px;
    --r-lg: 22px;
    --t-fast: 180ms cubic-bezier(.2,.8,.2,1);
    --t-mid: 320ms cubic-bezier(.2,.8,.2,1);
    --max-w: 1240px;
    --header-h: 72px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB",
                 "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
    color: var(--c-text);
    background:
        radial-gradient(1200px 800px at 10% -10%, rgba(255,62,165,.25), transparent 60%),
        radial-gradient(900px 700px at 100% 10%, rgba(62,220,255,.20), transparent 60%),
        radial-gradient(800px 600px at 50% 110%, rgba(180,107,255,.25), transparent 60%),
        linear-gradient(180deg, var(--c-bg-1), var(--c-bg-2) 60%, var(--c-bg-3));
    background-attachment: fixed;
    min-height: 100vh;
    line-height: 1.7;
    overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--t-fast); }
a:hover { color: var(--c-accent-2); }
button { font: inherit; cursor: pointer; }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }
.visually-hidden {
    position: absolute !important; width: 1px; height: 1px; padding: 0;
    margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.skip-link {
    position: absolute; left: -9999px; top: 0;
    background: var(--c-accent-1); color: #fff; padding: 8px 14px; border-radius: 8px;
}
.skip-link:focus { left: 12px; top: 12px; z-index: 999; }

/* =============== Header =============== */
.site-header {
    position: sticky; top: 0; z-index: 100;
    height: var(--header-h);
    backdrop-filter: blur(18px) saturate(140%);
    -webkit-backdrop-filter: blur(18px) saturate(140%);
    background: rgba(11, 13, 26, 0.55);
    border-bottom: 1px solid var(--c-border);
    transition: background var(--t-mid), box-shadow var(--t-mid);
}
.site-header.is-scrolled { background: rgba(11, 13, 26, 0.78); box-shadow: 0 6px 30px rgba(0,0,0,.4); }
.header-inner {
    height: 100%; display: flex; align-items: center; gap: 18px;
}
.brand { flex: 0 0 auto; }
.brand-link { display: inline-flex; align-items: center; gap: 12px; }
.brand-logo { width: 40px; height: 40px; display: inline-block; }
.brand-logo svg { width: 100%; height: 100%; filter: drop-shadow(0 4px 12px rgba(255,62,165,.35)); }
.brand-name {
    font-size: 1.15rem; margin: 0; letter-spacing: .5px;
    background: linear-gradient(90deg, var(--c-accent-1), var(--c-accent-2));
    -webkit-background-clip: text; background-clip: text; color: transparent;
    font-weight: 800;
}

.site-nav { flex: 1 1 auto; }
.nav-list {
    display: flex; gap: 6px; list-style: none; margin: 0; padding: 0;
    justify-content: center; flex-wrap: wrap;
}
.nav-link {
    display: inline-block; padding: 8px 14px; border-radius: 999px;
    font-size: .95rem; color: var(--c-text); position: relative;
    transition: background var(--t-fast), color var(--t-fast), transform var(--t-fast);
}
.nav-link:hover { background: var(--c-glass); transform: translateY(-1px); }
.nav-link.is-active {
    background: linear-gradient(90deg, rgba(255,62,165,.25), rgba(62,220,255,.25));
    color: #fff;
}

.search-box {
    flex: 0 0 280px; display: flex; align-items: center;
    background: var(--c-glass); border: 1px solid var(--c-border);
    border-radius: 999px; padding: 4px 6px 4px 16px;
    transition: box-shadow var(--t-mid), border-color var(--t-mid), background var(--t-mid);
}
.search-box:focus-within {
    box-shadow: 0 0 0 4px rgba(255, 62, 165, .15), 0 0 20px rgba(62,220,255,.2);
    border-color: rgba(255,62,165,.6);
    background: rgba(255,255,255,.1);
}
.search-box input {
    flex: 1 1 auto; background: transparent; border: 0; outline: 0;
    color: var(--c-text); padding: 8px 0; font-size: .9rem;
}
.search-box input::placeholder { color: var(--c-muted); }
.search-box button {
    border: 0; width: 36px; height: 36px; border-radius: 50%;
    background: linear-gradient(135deg, var(--c-accent-1), var(--c-accent-3));
    color: #fff; display: inline-flex; align-items: center; justify-content: center;
    transition: transform var(--t-fast);
}
.search-box button:hover { transform: rotate(-8deg) scale(1.06); }

.nav-toggle {
    display: none; width: 40px; height: 40px; border: 1px solid var(--c-border);
    background: var(--c-glass); border-radius: 10px; padding: 8px;
    flex-direction: column; gap: 4px; align-items: center; justify-content: center;
}
.nav-toggle span { display: block; width: 20px; height: 2px; background: #fff; border-radius: 2px; }

@media (max-width: 1024px) {
    .search-box { flex: 0 0 200px; }
}
@media (max-width: 860px) {
    .nav-toggle { display: inline-flex; }
    .site-nav {
        position: fixed; top: var(--header-h); left: 0; right: 0;
        background: rgba(11,13,26,.95); backdrop-filter: blur(20px);
        padding: 16px; border-top: 1px solid var(--c-border);
        transform: translateY(-12px); opacity: 0; pointer-events: none;
        transition: transform var(--t-mid), opacity var(--t-mid);
    }
    .site-nav.is-open { transform: translateY(0); opacity: 1; pointer-events: auto; }
    .nav-list { flex-direction: column; gap: 4px; }
    .search-box { flex: 1 1 auto; }
    .brand-name { font-size: 1rem; }
}

/* =============== Breadcrumb =============== */
.breadcrumb {
    padding: 16px 0; font-size: .85rem; color: var(--c-muted);
}
.breadcrumb ol { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 6px; }
.breadcrumb li::after { content: "›"; margin-left: 8px; opacity: .6; }
.breadcrumb li:last-child::after { content: ""; }
.breadcrumb a:hover { color: var(--c-accent-2); }

/* =============== Hero =============== */
.hero {
    position: relative; padding: 70px 0 50px; text-align: center;
}
.hero h2 {
    font-size: clamp(1.8rem, 4vw, 3rem); margin: 0 0 18px;
    background: linear-gradient(90deg, #fff, var(--c-accent-1) 40%, var(--c-accent-2));
    -webkit-background-clip: text; background-clip: text; color: transparent;
    font-weight: 800; letter-spacing: 1px;
}
.hero p { font-size: 1.05rem; color: var(--c-muted); max-width: 760px; margin: 0 auto 28px; }
.hero-cta { display: inline-flex; gap: 14px; flex-wrap: wrap; justify-content: center; }
.btn {
    display: inline-flex; align-items: center; gap: 8px; padding: 12px 24px;
    border-radius: 999px; border: 1px solid var(--c-border); color: #fff;
    background: var(--c-glass); transition: transform var(--t-fast), box-shadow var(--t-fast), background var(--t-fast);
    font-weight: 600;
}
.btn:hover { transform: translateY(-2px); background: var(--c-glass-strong); box-shadow: var(--c-shadow); color: #fff; }
.btn.btn-primary {
    background: linear-gradient(135deg, var(--c-accent-1), var(--c-accent-3));
    border-color: transparent;
    box-shadow: 0 10px 30px rgba(255,62,165,.35);
}
.btn.btn-primary:hover { box-shadow: 0 16px 40px rgba(255,62,165,.5); }

/* =============== Section =============== */
.section { padding: 50px 0; }
.section-head { display: flex; align-items: end; justify-content: space-between; gap: 16px; margin-bottom: 26px; flex-wrap: wrap; }
.section-head h3 {
    font-size: clamp(1.35rem, 2.4vw, 1.8rem); margin: 0;
    display: inline-flex; align-items: center; gap: 12px;
}
.section-head h3::before {
    content: ""; width: 6px; height: 26px; border-radius: 3px;
    background: linear-gradient(180deg, var(--c-accent-1), var(--c-accent-2));
    display: inline-block;
}
.section-head .more { font-size: .9rem; color: var(--c-muted); }
.section-head .more:hover { color: var(--c-accent-2); }

/* =============== Video Cards Grid =============== */
.cards {
    display: grid; gap: 22px;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
}
.card {
    position: relative; background: var(--c-glass); border: 1px solid var(--c-border);
    border-radius: var(--r-lg); overflow: hidden; backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    transition: transform var(--t-mid), box-shadow var(--t-mid), border-color var(--t-mid);
    will-change: transform;
}
.card:hover {
    transform: translateY(-6px);
    box-shadow: 0 20px 50px rgba(0,0,0,.45), 0 0 0 1px rgba(255,62,165,.2);
    border-color: rgba(255,62,165,.4);
}
.card .thumb {
    position: relative; aspect-ratio: 16/9; overflow: hidden; background: #111527;
}
.card .thumb img {
    width: 100%; height: 100%; object-fit: cover;
    transition: transform 600ms ease;
}
.card:hover .thumb img { transform: scale(1.08); }
.card .mask {
    position: absolute; inset: 0;
    background: linear-gradient(180deg, rgba(0,0,0,0) 40%, rgba(0,0,0,.6) 100%),
                radial-gradient(circle at center, rgba(255,62,165,0) 30%, rgba(11,13,26,.55));
    opacity: 0; transition: opacity var(--t-mid);
    display: flex; align-items: center; justify-content: center;
}
.card:hover .mask { opacity: 1; }
.play-btn {
    width: 64px; height: 64px; border-radius: 50%; border: 0;
    background: linear-gradient(135deg, var(--c-accent-1), var(--c-accent-2));
    box-shadow: 0 0 30px rgba(255,62,165,.55), 0 0 60px rgba(62,220,255,.35);
    display: inline-flex; align-items: center; justify-content: center;
    transform: scale(.6); transition: transform var(--t-mid);
    color: #fff;
}
.card:hover .play-btn { transform: scale(1); }
.play-btn svg { width: 26px; height: 26px; margin-left: 4px; }

.card .badge {
    position: absolute; top: 10px; left: 10px; z-index: 2;
    background: rgba(0,0,0,.5); color: #fff; padding: 4px 10px;
    border-radius: 999px; font-size: .72rem; backdrop-filter: blur(8px);
    border: 1px solid var(--c-border);
}
.card .duration {
    position: absolute; bottom: 10px; right: 10px; z-index: 2;
    background: rgba(0,0,0,.65); color: #fff; padding: 2px 8px;
    border-radius: 6px; font-size: .72rem; font-variant-numeric: tabular-nums;
}
.card-body { padding: 14px 16px 16px; }
.card-title {
    font-size: 1rem; font-weight: 700; margin: 0 0 6px;
    line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2;
    -webkit-box-orient: vertical; overflow: hidden;
}
.card-desc {
    font-size: .82rem; color: var(--c-muted); margin: 0 0 10px;
    display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
}
.card-meta { display: flex; justify-content: space-between; font-size: .75rem; color: var(--c-muted); }
.card-tags { display: flex; gap: 6px; flex-wrap: wrap; margin-top: 8px; }
.card-tag {
    font-size: .7rem; color: var(--c-accent-2);
    border: 1px solid rgba(62,220,255,.3); border-radius: 6px;
    padding: 2px 8px; background: rgba(62,220,255,.08);
}

/* =============== Reviews =============== */
.reviews {
    display: grid; gap: 20px;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
}
.review {
    background: var(--c-glass); border: 1px solid var(--c-border);
    border-radius: var(--r-lg); padding: 22px; backdrop-filter: blur(14px);
    transition: transform var(--t-fast);
}
.review:hover { transform: translateY(-3px); }
.review-head { display: flex; gap: 12px; align-items: center; margin-bottom: 12px; }
.review-head img {
    width: 48px; height: 48px; border-radius: 50%; object-fit: cover;
    border: 2px solid rgba(255,255,255,.2);
}
.review-meta strong { display: block; font-size: .95rem; }
.review-meta span { font-size: .75rem; color: var(--c-muted); }
.stars { color: #ffd166; letter-spacing: 2px; }
.review p { margin: 8px 0 0; color: #d6daf5; font-size: .92rem; }

/* =============== Contact =============== */
.contact-grid {
    display: grid; gap: 24px;
    grid-template-columns: 1.4fr 1fr;
}
@media (max-width: 860px) { .contact-grid { grid-template-columns: 1fr; } }
.contact-card, .qr-card {
    background: var(--c-glass); border: 1px solid var(--c-border);
    border-radius: var(--r-lg); padding: 26px; backdrop-filter: blur(14px);
}
.store-photos {
    display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 10px; margin: 16px 0;
}
.store-photos img { aspect-ratio: 4/3; object-fit: cover; border-radius: 12px; }
@media (max-width: 600px) { .store-photos { grid-template-columns: 1fr 1fr; } }

.qr-card { display: flex; flex-direction: column; gap: 14px; }
.qr-list { display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; }
.qr-item { text-align: center; background: rgba(255,255,255,.05); padding: 10px; border-radius: 12px; }
.qr-item img { width: 100%; aspect-ratio: 1/1; border-radius: 8px; background: #fff; }
.qr-item span { display: block; margin-top: 6px; font-size: .8rem; color: var(--c-muted); }

.contact-info { list-style: none; padding: 0; margin: 0; display: grid; gap: 8px; font-size: .92rem; }
.contact-info li { display: flex; gap: 8px; }
.contact-info li b { min-width: 80px; color: var(--c-accent-2); font-weight: 600; }

/* =============== Share =============== */
.share-row {
    display: flex; gap: 12px; margin-top: 18px; flex-wrap: wrap;
    justify-content: center;
}
.share-btn {
    width: 44px; height: 44px; border-radius: 50%;
    background: var(--c-glass); border: 1px solid var(--c-border);
    display: inline-flex; align-items: center; justify-content: center;
    color: #fff; transition: transform var(--t-fast), background var(--t-fast);
}
.share-btn:hover { transform: translateY(-2px) scale(1.06); background: var(--c-glass-strong); }
.share-btn svg { width: 20px; height: 20px; }

/* =============== FAQ =============== */
.faq { display: grid; gap: 12px; max-width: 920px; margin: 0 auto; }
.faq details {
    background: var(--c-glass); border: 1px solid var(--c-border);
    border-radius: var(--r-md); padding: 14px 18px; transition: background var(--t-fast);
}
.faq details[open] { background: var(--c-glass-strong); }
.faq summary {
    list-style: none; cursor: pointer; font-weight: 600; display: flex;
    align-items: center; justify-content: space-between; gap: 10px;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
    content: "+"; font-size: 1.2rem; color: var(--c-accent-1);
    transition: transform var(--t-fast);
}
.faq details[open] summary::after { content: "−"; }
.faq .faq-body {
    margin-top: 10px; color: var(--c-muted); font-size: .92rem;
    animation: faqIn .25s ease;
}
@keyframes faqIn { from { opacity: 0; transform: translateY(-4px); } to { opacity: 1; transform: translateY(0); } }

/* =============== Footer =============== */
.site-footer {
    margin-top: 60px; border-top: 1px solid var(--c-border);
    background: rgba(7, 8, 18, 0.55); backdrop-filter: blur(18px);
    padding: 40px 0 16px;
}
.footer-grid {
    display: grid; grid-template-columns: 1.5fr 1fr 1.2fr; gap: 30px;
}
@media (max-width: 800px) { .footer-grid { grid-template-columns: 1fr; } }
.footer-title {
    margin: 0 0 12px; font-size: 1rem;
    color: #fff; position: relative; padding-left: 14px;
}
.footer-title::before {
    content: ""; position: absolute; left: 0; top: 50%; transform: translateY(-50%);
    width: 4px; height: 16px; border-radius: 2px;
    background: linear-gradient(180deg, var(--c-accent-1), var(--c-accent-2));
}
.footer-col p, .footer-links li { color: var(--c-muted); font-size: .88rem; line-height: 1.8; }
.footer-links { list-style: none; margin: 0; padding: 0; }
.footer-links a:hover { color: var(--c-accent-2); }
.footer-copy {
    text-align: center; color: var(--c-muted); font-size: .8rem; padding-top: 24px;
    border-top: 1px dashed var(--c-border); margin-top: 28px;
}

/* =============== Misc =============== */
.glass-panel {
    background: var(--c-glass); border: 1px solid var(--c-border);
    border-radius: var(--r-lg); padding: 26px; backdrop-filter: blur(14px);
}
.tag-cloud { display: flex; flex-wrap: wrap; gap: 8px; }
.tag-cloud .tag {
    font-size: .8rem; color: #fff; padding: 6px 12px; border-radius: 999px;
    background: linear-gradient(90deg, rgba(255,62,165,.18), rgba(62,220,255,.18));
    border: 1px solid var(--c-border);
}

@media (prefers-reduced-motion: reduce) {
    *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}