/* SociaMus —— 专为年轻一代设计的音乐社交平台 */
:root {
  --bg: #07060e;
  --bg-2: #0d0b1a;
  --panel: rgba(255, 255, 255, .045);
  --panel-2: rgba(255, 255, 255, .07);
  --line: rgba(255, 255, 255, .1);
  --text: #f2f0ff;
  --muted: #9c97bd;
  --violet: #7c5cff;
  --pink: #ff4d9d;
  --cyan: #22d3ee;
  --grad: linear-gradient(100deg, #7c5cff, #ff4d9d 55%, #22d3ee);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
  line-height: 1.75; -webkit-font-smoothing: antialiased; overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.wrap { width: 100%; max-width: 1140px; margin: 0 auto; padding: 0 22px; }

/* 背景光斑 */
.orb { position: fixed; border-radius: 50%; filter: blur(110px); pointer-events: none; z-index: 0; }
.orb.a { width: 460px; height: 460px; background: rgba(124, 92, 255, .30); top: -160px; left: -120px; }
.orb.b { width: 420px; height: 420px; background: rgba(255, 77, 157, .22); top: 12%; right: -140px; }
.orb.c { width: 380px; height: 380px; background: rgba(34, 211, 238, .16); bottom: 6%; left: 26%; }

/* 头部 */
.hd {
  position: sticky; top: 0; z-index: 30;
  background: rgba(7, 6, 14, .74); backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.hd-in { display: flex; align-items: center; justify-content: space-between; height: 66px; gap: 16px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 18px; letter-spacing: .4px; }
.logo .mark {
  width: 30px; height: 30px; border-radius: 9px; background: var(--grad);
  display: flex; align-items: center; justify-content: center; color: #fff; font-size: 16px; font-weight: 800;
}
.nav { display: flex; align-items: center; gap: 6px; }
.nav a { padding: 8px 14px; border-radius: 9px; font-size: 14.5px; color: var(--muted); }
.nav a:hover { color: var(--text); background: var(--panel); }
.nav a.cta { background: var(--grad); color: #fff; font-weight: 600; margin-left: 6px; }
.nav a.cta:hover { filter: brightness(1.12); }

/* Hero */
.hero { position: relative; z-index: 1; padding: 78px 0 70px; }
.hero-in { display: grid; grid-template-columns: 1.15fr .85fr; gap: 44px; align-items: center; }
.pill {
  display: inline-flex; align-items: center; gap: 8px; margin-bottom: 20px;
  padding: 6px 14px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--panel); color: var(--muted); font-size: 12.5px;
}
.pill i { width: 6px; height: 6px; border-radius: 50%; background: var(--cyan); box-shadow: 0 0 10px var(--cyan); }
h1 { margin: 0 0 18px; font-size: 50px; line-height: 1.14; letter-spacing: -1.2px; font-weight: 800; }
h1 em { font-style: normal; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { margin: 0 0 28px; color: var(--muted); font-size: 16px; max-width: 520px; }
.cta { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.btn {
  display: inline-flex; align-items: center; gap: 8px; padding: 13px 24px; border-radius: 12px;
  border: 1px solid var(--line); background: var(--panel); color: var(--text);
  font-size: 14.5px; cursor: pointer; transition: .2s;
}
.btn:hover { border-color: rgba(255,255,255,.28); transform: translateY(-1px); }
.btn.primary { background: var(--grad); border: 0; font-weight: 700; color: #fff; }
.btn.primary:hover { filter: brightness(1.12); }
.hero-note { margin-top: 20px; color: var(--muted); font-size: 12.5px; }

/* 手机模型 */
.phone {
  width: 258px; margin: 0 auto; border-radius: 34px; padding: 12px;
  background: linear-gradient(160deg, rgba(255,255,255,.16), rgba(255,255,255,.04));
  border: 1px solid var(--line); box-shadow: 0 34px 90px rgba(0,0,0,.6), 0 0 0 6px rgba(255,255,255,.02);
}
.screen { border-radius: 24px; background: #0b0918; padding: 18px 16px 16px; overflow: hidden; }
.scr-top { display: flex; justify-content: space-between; align-items: center; color: var(--muted); font-size: 10.5px; margin-bottom: 14px; }
.cover {
  height: 150px; border-radius: 16px; background: var(--grad); position: relative; overflow: hidden;
  display: flex; align-items: flex-end; padding: 12px; color: #fff; font-weight: 700; font-size: 13px;
}
.cover::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 35%, rgba(0,0,0,.45)); }
.cover span { position: relative; z-index: 1; }
.song-t { margin: 14px 0 2px; font-size: 14.5px; font-weight: 700; }
.song-s { color: var(--muted); font-size: 11.5px; }
.bar { height: 4px; border-radius: 99px; background: rgba(255,255,255,.14); margin: 14px 0 8px; }
.bar i { display: block; height: 100%; width: 42%; border-radius: 99px; background: var(--grad); }
.times { display: flex; justify-content: space-between; color: var(--muted); font-size: 10px; }
.ctrl { display: flex; align-items: center; justify-content: center; gap: 18px; margin: 16px 0 6px; font-size: 17px; }
.ctrl .play {
  width: 42px; height: 42px; border-radius: 50%; background: var(--grad);
  display: flex; align-items: center; justify-content: center; color: #fff; font-size: 15px;
}
.chips { display: flex; gap: 6px; margin-top: 16px; flex-wrap: wrap; }
.chip { font-size: 10.5px; padding: 3px 8px; border-radius: 999px; border: 1px solid var(--line); color: var(--muted); background: var(--panel); white-space: nowrap; }

/* 区块 */
.sec { position: relative; z-index: 1; padding: 72px 0; }
/* 锚点跳转时预留吸顶导航高度，避免标题被遮挡 */
.sec[id], .card[id], [id] { scroll-margin-top: 84px; }
.sec.alt { background: linear-gradient(180deg, rgba(255,255,255,.022), transparent); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); }
.sec-hd { margin-bottom: 34px; }
.sec-hd h2 { margin: 0 0 10px; font-size: 30px; letter-spacing: -.6px; font-weight: 800; }
.sec-hd p { margin: 0; color: var(--muted); font-size: 15px; max-width: 620px; }
.sec-hd .en { display: block; color: rgba(255,255,255,.22); font-size: 12px; letter-spacing: 3px; text-transform: uppercase; margin-bottom: 8px; }

.grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(268px, 1fr)); }
.card {
  border: 1px solid var(--line); border-radius: 16px; padding: 22px;
  background: linear-gradient(180deg, var(--panel-2), var(--panel));
  transition: .25s;
}
.card:hover { transform: translateY(-4px); border-color: rgba(255,255,255,.22); }
.card .ic {
  width: 40px; height: 40px; border-radius: 12px; display: flex; align-items: center; justify-content: center;
  background: var(--grad); font-size: 18px; margin-bottom: 14px;
}
.card h3 { margin: 0 0 8px; font-size: 16.5px; }
.card p { margin: 0; color: var(--muted); font-size: 13.8px; }

.hl { display: grid; gap: 16px; grid-template-columns: repeat(auto-fill, minmax(258px, 1fr)); }
.hl .item { border: 1px solid var(--line); border-radius: 16px; padding: 24px; background: var(--panel); position: relative; overflow: hidden; }
.hl .item::before { content: ""; position: absolute; inset: 0 auto 0 0; width: 3px; background: var(--grad); }
.hl .item b { display: block; font-size: 17px; margin-bottom: 8px; }
.hl .item p { margin: 0; color: var(--muted); font-size: 13.8px; }

.quote {
  border: 1px solid var(--line); border-radius: 18px; padding: 30px 32px;
  background: linear-gradient(120deg, rgba(124,92,255,.14), rgba(255,77,157,.09));
}
.quote p { margin: 0; font-size: 17px; line-height: 1.9; }

/* 页脚 */
.ft { position: relative; z-index: 1; border-top: 1px solid var(--line); padding: 46px 0 30px; background: var(--bg-2); }
.ft-grid { display: grid; grid-template-columns: 1.7fr 1fr 1fr 1.2fr; gap: 26px; }
.ft h4 { margin: 0 0 12px; font-size: 13.5px; }
.ft a { display: block; color: var(--muted); font-size: 13.5px; margin: 7px 0; }
.ft a:hover { color: var(--text); }
.ft p { color: var(--muted); font-size: 13px; margin: 7px 0; }
.ft .cp { margin-top: 26px; padding-top: 18px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12.5px; display: flex; justify-content: space-between; gap: 14px; flex-wrap: wrap; }

/* 法务页 */
.doc-wrap { position: relative; z-index: 1; padding: 48px 0 64px; }
.doc { max-width: 880px; margin: 0 auto; }
.doc h1 { font-size: 32px; margin: 0 0 8px; }
.doc .meta { color: var(--muted); font-size: 13px; margin-bottom: 26px; }
.doc h2 { font-size: 18px; margin: 30px 0 10px; padding-left: 12px; border-left: 3px solid var(--violet); }
.doc p, .doc li { color: #c9c5e2; font-size: 14.5px; }
.doc ul, .doc ol { padding-left: 22px; }
.doc li { margin: 6px 0; }
.doc table { width: 100%; border-collapse: collapse; margin: 12px 0; }
.doc th, .doc td { border: 1px solid var(--line); padding: 10px 12px; font-size: 13.5px; text-align: left; color: #c9c5e2; }
.doc th { background: var(--panel); }
.doc .box { border: 1px solid var(--line); border-radius: 12px; padding: 16px 18px; background: var(--panel); margin: 16px 0; }
.doc .box p { margin: 5px 0; }

@media (max-width: 900px) {
  .hero-in { grid-template-columns: 1fr; gap: 34px; }
  h1 { font-size: 34px; }
  .lead { font-size: 15px; }
  .ft-grid { grid-template-columns: 1fr 1fr; }
  .nav a:not(.cta) { display: none; }
  .sec { padding: 54px 0; }
  .sec-hd h2 { font-size: 23px; }
  .phone { width: 232px; }
}
@media (max-width: 560px) {
  .ft-grid { grid-template-columns: 1fr; }
  .doc h1 { font-size: 25px; }
}