/* 树洞恋人官网：星幕暗黑背景与星幕玻璃视觉系统 */
:root {
    --bg-top: #3a3d4f;
    --bg-middle: #2a2c3a;
    --bg-bottom: #17181f;
    --text-primary: rgba(255, 255, 255, 0.96);
    --text-secondary: rgba(255, 255, 255, 0.68);
    --text-muted: rgba(255, 255, 255, 0.46);
    --glass: rgba(0, 0, 0, 0.30);
    --glass-strong: rgba(0, 0, 0, 0.46);
    --glass-border: rgba(255, 255, 255, 0.10);
    --glass-border-hover: rgba(255, 255, 255, 0.22);
    --primary: #afb6e0;
    --primary-bright: #d9dcff;
    --nebula-blue: rgba(175, 182, 224, 0.18);
    --nebula-violet: rgba(201, 184, 232, 0.13);
    --shadow: 0 24px 80px rgba(0, 0, 0, 0.30);
    --font: 'Outfit', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --transition: 260ms cubic-bezier(.2, .8, .2, 1);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; background: var(--bg-bottom); }
body {
    min-height: 100vh;
    overflow-x: hidden;
    color: var(--text-primary);
    font-family: var(--font);
    line-height: 1.65;
    background:
        linear-gradient(180deg, rgba(0,0,0,.12) 0%, rgba(0,0,0,.42) 50%, rgba(0,0,0,.76) 100%),
        linear-gradient(180deg, var(--bg-top) 0%, var(--bg-middle) 50%, var(--bg-bottom) 100%);
    background-attachment: fixed;
}
body::before {
    content: '';
    position: fixed;
    inset: 0;
    pointer-events: none;
    z-index: 0;
    opacity: .55;
    background-image:
        radial-gradient(circle at 12% 18%, rgba(255,255,255,.65) 0 1px, transparent 1.5px),
        radial-gradient(circle at 78% 12%, rgba(255,255,255,.42) 0 1px, transparent 1.5px),
        radial-gradient(circle at 54% 38%, rgba(255,255,255,.34) 0 1px, transparent 1.5px),
        radial-gradient(circle at 20% 72%, rgba(255,255,255,.28) 0 1px, transparent 1.5px),
        radial-gradient(circle at 88% 66%, rgba(255,255,255,.36) 0 1px, transparent 1.5px);
    background-size: 210px 210px, 280px 280px, 360px 360px, 430px 430px, 520px 520px;
}
a { color: inherit; }
.container { width: min(1200px, calc(100% - 48px)); margin: 0 auto; }
.ambient-glow { position: fixed; pointer-events: none; z-index: 0; border-radius: 50%; filter: blur(85px); }
.glow-1 { width: 360px; height: 360px; top: -120px; left: -80px; background: var(--nebula-blue); }
.glow-2 { width: 420px; height: 420px; right: -100px; bottom: -140px; background: var(--nebula-violet); }

.app-header {
    position: fixed; inset: 0 0 auto; z-index: 100; height: 76px;
    display: flex; align-items: center;
    background: rgba(12, 13, 18, .58);
    border-bottom: 1px solid var(--glass-border);
    backdrop-filter: blur(22px) saturate(135%);
    -webkit-backdrop-filter: blur(22px) saturate(135%);
}
.header-container, .brand-logo, .main-nav, .hero-actions, .app-sim-status,
.app-sim-nav, .app-sim-tags, .app-sim-controls, .showcase-metric,
.download-buttons, .footer-bottom-container, .regulatory-info { display: flex; align-items: center; }
.header-container, .footer-bottom-container { justify-content: space-between; }
.brand-logo { gap: 12px; text-decoration: none; }
.logo-img { width: 42px; height: 42px; object-fit: contain; border-radius: 13px; box-shadow: 0 8px 28px rgba(0,0,0,.34); }
.brand-text { display: flex; flex-direction: column; font-size: 19px; line-height: 1.15; font-weight: 700; }
.brand-sub { margin-top: 4px; color: var(--text-muted); font-size: 9px; letter-spacing: 1.8px; font-weight: 500; }
.main-nav { gap: 34px; }
.nav-link { color: var(--text-secondary); font-size: 14px; text-decoration: none; transition: color var(--transition); }
.nav-link:hover { color: #fff; }

.hero-section, .features-section, .showcase-section, .download-section, .app-footer { position: relative; z-index: 2; }
.hero-section { min-height: 100vh; display: flex; align-items: center; padding: 132px 0 80px; }
.hero-container { display: grid; grid-template-columns: 1.04fr .96fr; align-items: center; gap: 74px; }
.badge-tag {
    display: inline-flex; padding: 8px 15px; margin-bottom: 24px; border-radius: 999px;
    color: rgba(255,255,255,.82); background: rgba(0,0,0,.26); border: 1px solid var(--glass-border);
    backdrop-filter: blur(16px); font-size: 13px; letter-spacing: .4px;
}
.hero-title { font-size: clamp(46px, 6vw, 76px); line-height: 1.08; letter-spacing: -3px; font-weight: 700; }
.gradient-text { color: transparent; background: linear-gradient(110deg, #fff 5%, #cdd2fb 45%, #b7a8d6 95%); background-clip: text; -webkit-background-clip: text; }
.hero-subtitle { max-width: 640px; margin: 28px 0 36px; color: var(--text-secondary); font-size: 17px; }
.hero-actions { gap: 14px; }
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 9px;
    min-height: 48px; padding: 0 23px; border-radius: 16px; text-decoration: none;
    border: 1px solid var(--glass-border); font-weight: 600; transition: all var(--transition);
}
.btn-primary { color: #17181f; background: rgba(255,255,255,.92); box-shadow: 0 12px 30px rgba(0,0,0,.22); }
.btn-secondary { color: #fff; background: var(--glass); backdrop-filter: blur(18px); }
.btn:hover { transform: translateY(-2px); border-color: var(--glass-border-hover); box-shadow: 0 16px 38px rgba(0,0,0,.34); }

.hero-visual { display: flex; justify-content: center; perspective: 1000px; }
.phone-mockup {
    width: 310px; height: 632px; position: relative; padding: 10px; border-radius: 48px;
    background: linear-gradient(145deg, rgba(255,255,255,.22), rgba(255,255,255,.06));
    border: 1px solid rgba(255,255,255,.24); box-shadow: 0 42px 110px rgba(0,0,0,.48), inset 0 0 0 2px rgba(0,0,0,.46);
    transform: rotateY(-5deg) rotateX(2deg);
}
.phone-notch { position: absolute; z-index: 5; width: 108px; height: 28px; top: 17px; left: 50%; transform: translateX(-50%); border-radius: 20px; background: #08090c; }
.phone-screen {
    height: 100%; overflow: hidden; border-radius: 39px; position: relative;
    background:
        radial-gradient(circle at 12% 5%, rgba(175,182,224,.25), transparent 36%),
        radial-gradient(circle at 88% 88%, rgba(201,184,232,.16), transparent 34%),
        linear-gradient(180deg, #353847, #242630 52%, #111217);
}
.phone-screen::after { content: ''; position: absolute; inset: 0; pointer-events: none; background: linear-gradient(180deg, rgba(0,0,0,.06), rgba(0,0,0,.60)); }
.app-sim-header, .app-sim-content { position: relative; z-index: 2; }
.app-sim-header { padding: 18px 18px 0; }
.app-sim-status, .app-sim-nav { justify-content: space-between; }
.app-sim-status { font-size: 10px; color: rgba(255,255,255,.75); }
.app-sim-nav { margin-top: 25px; }
.app-sim-logo-text { font-size: 15px; font-weight: 700; }
.app-sim-badge, .status-badge, .app-sim-tag { border: 1px solid var(--glass-border); background: rgba(0,0,0,.28); color: rgba(255,255,255,.76); }
.app-sim-badge { padding: 4px 8px; border-radius: 999px; font-size: 9px; }
.app-sim-content { padding: 26px 17px; }
.app-sim-card {
    min-height: 412px; display: flex; align-items: flex-end; overflow: hidden; position: relative;
    border-radius: 28px; border: 1px solid rgba(255,255,255,.12); box-shadow: 0 20px 50px rgba(0,0,0,.36);
    background:
        linear-gradient(180deg, transparent 25%, rgba(5,6,9,.92) 100%),
        radial-gradient(circle at 65% 26%, rgba(202,184,156,.45), transparent 20%),
        linear-gradient(145deg, #4a4c58, #23252e 58%, #14151b);
}
.app-sim-card::before { content: ''; position: absolute; width: 170px; height: 240px; left: 50%; top: 36px; transform: translateX(-50%); border-radius: 90px 90px 28px 28px; background: linear-gradient(160deg, rgba(255,255,255,.18), rgba(0,0,0,.22)); filter: blur(.2px); }
.app-sim-card-info { position: relative; z-index: 2; width: 100%; padding: 22px 18px; }
.app-sim-card-name { font-size: 17px; font-weight: 700; }
.status-badge { margin-left: 5px; padding: 3px 6px; border-radius: 8px; font-size: 8px; }
.app-sim-card-meta { margin: 5px 0 11px; color: rgba(255,255,255,.57); font-size: 10px; }
.app-sim-tags { gap: 6px; flex-wrap: wrap; }
.app-sim-tag { padding: 3px 7px; border-radius: 8px; font-size: 8px; }
.app-sim-whisper { margin-top: 13px; padding: 10px 11px; border-radius: 12px; color: rgba(255,255,255,.70); background: rgba(0,0,0,.30); border: 1px solid var(--glass-border); font-size: 9px; }
.app-sim-controls { justify-content: center; gap: 14px; margin-top: 18px; }
.app-sim-btn { width: 43px; height: 43px; display: grid; place-items: center; border-radius: 50%; background: var(--glass); border: 1px solid var(--glass-border); box-shadow: 0 8px 20px rgba(0,0,0,.24); }

.features-section { padding: 110px 0; }
.section-header { max-width: 700px; margin: 0 auto 52px; text-align: center; }
.section-pretitle { display: block; margin-bottom: 10px; color: var(--primary); font-size: 11px; font-weight: 700; letter-spacing: 2.4px; }
.section-title, .showcase-title, .download-title { font-size: clamp(32px, 4vw, 46px); line-height: 1.2; letter-spacing: -1.2px; }
.section-subtitle { margin-top: 16px; color: var(--text-secondary); }
.features-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.feature-card, .download-card {
    background: var(--glass); border: 1px solid var(--glass-border); backdrop-filter: blur(24px) saturate(120%);
    -webkit-backdrop-filter: blur(24px) saturate(120%); box-shadow: var(--shadow);
}
.feature-card { min-height: 280px; padding: 30px 26px; border-radius: 24px; transition: all var(--transition); }
.feature-card:hover { transform: translateY(-7px); border-color: var(--glass-border-hover); background: rgba(0,0,0,.38); }
.feature-icon-wrapper { width: 48px; height: 48px; display: grid; place-items: center; margin-bottom: 27px; border-radius: 16px; color: var(--primary-bright); background: rgba(255,255,255,.08); border: 1px solid var(--glass-border); }
.feature-card-title { margin-bottom: 12px; font-size: 19px; }
.feature-card-desc { color: var(--text-secondary); font-size: 14px; }

.showcase-section { padding: 110px 0; overflow: hidden; }
.showcase-container { display: grid; grid-template-columns: 1fr .8fr; gap: 90px; align-items: center; }
.showcase-text { max-width: 650px; margin: 24px 0 38px; color: var(--text-secondary); font-size: 16px; }
.showcase-metric { gap: 48px; }
.metric-item { display: flex; flex-direction: column; }
.metric-num { font-size: 32px; font-weight: 700; color: var(--primary-bright); }
.metric-label { color: var(--text-muted); font-size: 12px; }
.showcase-visual { display: flex; justify-content: center; }
.galaxy-orb-wrapper { width: 320px; height: 320px; position: relative; display: grid; place-items: center; }
.galaxy-orb { width: 220px; height: 220px; position: relative; display: grid; place-items: center; border-radius: 50%; background: radial-gradient(circle at 36% 30%, rgba(255,255,255,.35), rgba(175,182,224,.12) 34%, rgba(0,0,0,.48) 72%); border: 1px solid rgba(255,255,255,.18); box-shadow: 0 0 80px rgba(175,182,224,.20), inset 0 0 45px rgba(255,255,255,.08); }
.orb-inner { position: absolute; inset: 34px; border-radius: 50%; border: 1px solid rgba(255,255,255,.14); }
.orb-stars { font-size: 36px; filter: drop-shadow(0 0 18px rgba(255,255,255,.48)); }
.orb-ring { position: absolute; width: 300px; height: 90px; border-radius: 50%; border: 1px solid rgba(255,255,255,.18); transform: rotate(-16deg); }
.orb-reflection { position: absolute; width: 190px; height: 30px; bottom: 4px; border-radius: 50%; background: rgba(175,182,224,.12); filter: blur(18px); }

.download-section { padding: 100px 0 130px; }
.download-card { overflow: hidden; position: relative; padding: 76px 36px; border-radius: 30px; text-align: center; }
.download-card-glow { position: absolute; width: 520px; height: 300px; top: -180px; left: 50%; transform: translateX(-50%); border-radius: 50%; background: rgba(175,182,224,.14); filter: blur(70px); }
.download-content { position: relative; z-index: 2; }
.download-subtitle { max-width: 600px; margin: 17px auto 38px; color: var(--text-secondary); }
.download-buttons { justify-content: center; gap: 14px; flex-wrap: wrap; }
.btn-download { min-width: 210px; display: flex; align-items: center; gap: 13px; padding: 14px 22px; color: #fff; text-align: left; text-decoration: none; border-radius: 17px; background: rgba(0,0,0,.44); border: 1px solid var(--glass-border); box-shadow: 0 12px 26px rgba(0,0,0,.25); transition: all var(--transition); }
.btn-download:hover { transform: translateY(-3px); border-color: var(--glass-border-hover); background: rgba(0,0,0,.56); }
.btn-download-text { display: flex; flex-direction: column; }
.btn-dl-small { color: var(--text-muted); font-size: 9px; letter-spacing: .7px; text-transform: uppercase; }
.btn-dl-large { font-size: 15px; font-weight: 600; }
.btn-download-disabled { cursor: default; opacity: .48; }
.btn-download-disabled:hover { transform: none; border-color: var(--glass-border); background: rgba(0,0,0,.44); }

.app-footer { padding-top: 78px; background: rgba(7,8,11,.38); border-top: 1px solid var(--glass-border); backdrop-filter: blur(20px); }
.footer-container { display: grid; grid-template-columns: 1.6fr .8fr 1.1fr 1.15fr; gap: 44px; padding-bottom: 58px; }
.footer-desc { max-width: 330px; margin-top: 18px; color: var(--text-secondary); font-size: 13px; }
.footer-title { margin-bottom: 16px; color: var(--text-primary); font-size: 13px; }
.footer-link-group { display: flex; flex-direction: column; align-items: flex-start; gap: 10px; }
.footer-link, .footer-email { color: var(--text-secondary); font-size: 12px; text-decoration: none; transition: color var(--transition); }
.footer-link:hover, .footer-email:hover, .regulatory-link:hover { color: #fff; }
.footer-contact-item { color: var(--text-secondary); font-size: 12px; }
.footer-bottom { padding: 24px 0; border-top: 1px solid var(--glass-border); }
.copyright, .regulatory-info { color: var(--text-muted); font-size: 11px; }
.regulatory-info { gap: 18px; }
.regulatory-link { color: inherit; text-decoration: none; }

.legal-overlay[hidden] { display: none; }
.legal-overlay { position: fixed; inset: 0; z-index: 1000; display: flex; flex-direction: column; background: #17181f; }
.legal-overlay-header { flex: 0 0 58px; display: grid; grid-template-columns: 48px 1fr 48px; align-items: center; padding: 0 12px; color: #fff; background: rgba(12,13,18,.92); border-bottom: 1px solid var(--glass-border); backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px); }
.legal-overlay-back { width: 40px; height: 40px; border: 1px solid var(--glass-border); border-radius: 14px; color: #fff; background: var(--glass); cursor: pointer; font-size: 22px; }
.legal-overlay-back:hover { border-color: var(--glass-border-hover); background: rgba(255,255,255,.08); }
.legal-overlay-title { text-align: center; font-size: 16px; }
.legal-overlay-frame { flex: 1 1 auto; width: 100%; min-height: 0; border: 0; background: #fff; }

.animate-fade-in { animation: fadeIn .8s both; }
.animate-slide-up { animation: slideUp .85s both; }
.animate-scale-in { animation: scaleIn .9s both; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(22px); } to { opacity: 1; transform: translateY(0); } }
@keyframes scaleIn { from { opacity: 0; transform: scale(.94); } to { opacity: 1; transform: scale(1); } }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; scroll-behavior: auto !important; transition: none !important; } }

@media (max-width: 980px) {
    .hero-container, .showcase-container { grid-template-columns: 1fr; text-align: center; }
    .hero-content { display: flex; flex-direction: column; align-items: center; }
    .hero-visual { margin-top: 20px; }
    .features-grid { grid-template-columns: repeat(2, 1fr); }
    .showcase-metric { justify-content: center; }
    .footer-container { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 680px) {
    .container { width: min(100% - 32px, 1200px); }
    .app-header { height: 68px; }
    .main-nav { display: none; }
    .hero-section { padding: 108px 0 58px; }
    .hero-container { gap: 42px; }
    .hero-title { font-size: 43px; letter-spacing: -2px; }
    .hero-subtitle { font-size: 15px; }
    .hero-actions { width: 100%; }
    .btn { flex: 1; padding-inline: 14px; }
    .phone-mockup { width: 278px; height: 570px; transform: none; }
    .app-sim-card { min-height: 365px; }
    .features-section, .showcase-section { padding: 78px 0; }
    .features-grid { grid-template-columns: 1fr; }
    .feature-card { min-height: 0; }
    .galaxy-orb-wrapper { transform: scale(.82); }
    .download-section { padding: 72px 0 90px; }
    .download-card { padding: 54px 18px; }
    .btn-download { min-width: min(100%, 260px); }
    .footer-container { grid-template-columns: 1fr; gap: 32px; }
    .footer-bottom-container, .regulatory-info { flex-direction: column; align-items: flex-start; gap: 8px; }
}