/* 奈音 Nevtune · 官网样式（与 App 黑金主题一致） */
:root {
  --ink: #070707;
  --ink-2: #101010;
  --ink-3: #161616;
  --line: rgba(245, 245, 245, 0.09);
  --gold: #d8b26a;
  --gold-deep: #9c7626;
  --gold-soft: rgba(216, 178, 106, 0.14);
  --text: #f5f5f5;
  --dim: #9a9a9a;
  --faint: #686868;
  --on-gold: #171104;
  --danger: #e0544b;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--ink);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
  line-height: 1.65;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.wrap { width: min(1120px, calc(100% - 40px)); margin: 0 auto; }

/* 顶部导航 */
header.nav {
  position: sticky; top: 0; z-index: 20;
  background: rgba(7, 7, 7, 0.78);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-inner { display: flex; align-items: center; gap: 28px; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; letter-spacing: 1px; white-space: nowrap; }
.brand-logo { width: 30px; height: 30px; border-radius: 9px; object-fit: cover; flex: none; }
.brand .dot {
  width: 26px; height: 26px; border-radius: 9px;
  background: linear-gradient(135deg, var(--gold), var(--gold-deep));
  color: var(--on-gold); font-size: 14px; font-weight: 800;
  display: grid; place-items: center;
}
.nav-links { display: flex; gap: 22px; margin-left: auto; font-size: 14px; color: var(--dim); }
.nav-links a:hover { color: var(--text); }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  border-radius: 999px; padding: 11px 22px; font-size: 14px; font-weight: 600;
  border: 1px solid var(--line); background: rgba(245, 245, 245, 0.05); color: var(--text);
  cursor: pointer; transition: transform .15s ease, background .15s ease, opacity .15s;
}
.btn:hover { transform: translateY(-1px); }
.btn.gold { background: linear-gradient(135deg, var(--gold), var(--gold-deep)); color: var(--on-gold); border: none; }
.btn.ghost { background: transparent; }
.btn.small { padding: 8px 16px; font-size: 13px; }

/* 首屏 */
.hero { position: relative; overflow: hidden; padding: 84px 0 68px; }
.hero::before {
  content: ""; position: absolute; inset: -20% -10% auto -10%; height: 620px;
  background:
    radial-gradient(600px 320px at 18% 12%, rgba(216, 178, 106, 0.20), transparent 70%),
    radial-gradient(520px 300px at 82% 0%, rgba(216, 178, 106, 0.10), transparent 72%);
  pointer-events: none;
}
.hero-grid { position: relative; display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; }
.pill {
  display: inline-flex; align-items: center; gap: 8px; font-size: 12px; letter-spacing: .5px;
  color: var(--gold); background: var(--gold-soft); border: 1px solid rgba(216, 178, 106, .28);
  border-radius: 999px; padding: 5px 12px;
}
h1 {
  font-size: clamp(34px, 5vw, 56px); line-height: 1.15; margin: 18px 0 14px;
  letter-spacing: 2px; font-weight: 800;
}
h1 em { font-style: normal; background: linear-gradient(120deg, var(--gold), #f3dfb3 55%, var(--gold-deep)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.lead { color: var(--dim); font-size: 16px; max-width: 480px; }
.hero-actions { display: flex; gap: 14px; margin-top: 28px; flex-wrap: wrap; }
.hero-meta { display: flex; gap: 26px; margin-top: 30px; color: var(--faint); font-size: 13px; flex-wrap: wrap; }
.hero-meta b { color: var(--text); font-size: 18px; display: block; font-weight: 700; }
.hero-art {
  border-radius: 26px; overflow: hidden; border: 1px solid var(--line);
  box-shadow: 0 30px 80px rgba(0, 0, 0, .65), inset 0 0 0 1px rgba(216, 178, 106, .12);
}
.hero-art svg { display: block; width: 100%; height: auto; }

/* 通用区块 */
section { padding: 72px 0; }
.sec-head { margin-bottom: 34px; }
.sec-head .kicker { color: var(--gold); font-size: 13px; letter-spacing: 3px; text-transform: uppercase; }
.sec-head h2 { font-size: clamp(24px, 3.2vw, 34px); margin: 10px 0 8px; letter-spacing: 1px; }
.sec-head p { color: var(--dim); margin: 0; max-width: 620px; }

.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.card {
  background: linear-gradient(180deg, rgba(245,245,245,.045), rgba(245,245,245,.015));
  border: 1px solid var(--line); border-radius: 20px; padding: 24px;
}
.card .ico {
  width: 40px; height: 40px; border-radius: 12px; display: grid; place-items: center;
  background: var(--gold-soft); border: 1px solid rgba(216, 178, 106, .25); color: var(--gold);
  font-size: 18px; margin-bottom: 14px;
}
.card h3 { margin: 0 0 8px; font-size: 17px; letter-spacing: .5px; }
.card p { margin: 0; color: var(--dim); font-size: 14px; }

/* 邀请奖励 */
.rewards { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 18px; }
.reward {
  position: relative; border-radius: 22px; padding: 26px 22px; text-align: center;
  background: radial-gradient(280px 160px at 50% 0%, rgba(216,178,106,.16), transparent 70%), var(--ink-2);
  border: 1px solid rgba(216, 178, 106, .22);
}
.reward .num { font-size: 40px; font-weight: 800; letter-spacing: 1px;
  background: linear-gradient(120deg, var(--gold), #f6e6c2); -webkit-background-clip: text; background-clip: text; color: transparent; }
.reward .unit { color: var(--dim); font-size: 13px; margin-top: 2px; }
.reward .days { margin-top: 14px; font-size: 15px; color: var(--text); }
.reward .days b { color: var(--gold); font-size: 20px; }
.reward .tag { position: absolute; top: -11px; left: 50%; transform: translateX(-50%);
  font-size: 11px; padding: 3px 10px; border-radius: 999px; background: var(--gold); color: var(--on-gold); font-weight: 700; }

/* 下载区 */
.download {
  border-radius: 26px; padding: 40px; border: 1px solid rgba(216,178,106,.24);
  background:
    radial-gradient(520px 260px at 12% 0%, rgba(216,178,106,.18), transparent 70%),
    linear-gradient(180deg, #12100c, #0b0b0b);
  display: grid; grid-template-columns: 1.2fr .8fr; gap: 30px; align-items: center;
}
.download h2 { margin: 0 0 10px; font-size: 30px; letter-spacing: 1px; }
.download p { color: var(--dim); margin: 0 0 20px; }
.download .steps { color: var(--faint); font-size: 13px; margin-top: 14px; }
.qr-box { background: #fff; border-radius: 18px; padding: 14px; width: 168px; margin-left: auto; }
.qr-box img { width: 140px; height: 140px; }
.qr-cap { color: var(--dim); font-size: 12px; text-align: center; margin-top: 10px; }

/* FAQ */
.faq { display: grid; gap: 12px; }
details {
  border: 1px solid var(--line); border-radius: 16px; padding: 16px 20px;
  background: rgba(245,245,245,.03);
}
details summary { cursor: pointer; font-weight: 600; list-style: none; }
details summary::-webkit-details-marker { display: none; }
details p { color: var(--dim); margin: 10px 0 0; font-size: 14px; }

footer {
  border-top: 1px solid var(--line); padding: 34px 0 44px; color: var(--faint); font-size: 13px;
}
.foot-inner { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.foot-inner a:hover { color: var(--text); }

/* 邀请落地页 */
.landing { min-height: 100vh; display: grid; place-items: center; padding: 40px 20px;
  background:
    radial-gradient(680px 380px at 50% -8%, rgba(216,178,106,.22), transparent 70%),
    var(--ink); }
.landing-card {
  width: min(460px, 100%); border-radius: 26px; padding: 34px 26px; text-align: center;
  background: linear-gradient(180deg, rgba(245,245,245,.06), rgba(245,245,245,.015));
  border: 1px solid rgba(216,178,106,.26); box-shadow: 0 40px 90px rgba(0,0,0,.6);
}
.landing-card .logo { width: 62px; height: 62px; border-radius: 20px; margin: 0 auto 16px;
  display: grid; place-items: center; font-size: 28px; font-weight: 800; color: var(--on-gold);
  background: linear-gradient(135deg, var(--gold), var(--gold-deep)); }
.landing-card h1 { font-size: 24px; letter-spacing: 1px; margin: 0 0 8px; }
.landing-card .sub { color: var(--dim); font-size: 14px; margin: 0 0 22px; }
.code-box {
  border: 1px dashed rgba(216,178,106,.5); border-radius: 16px; padding: 16px;
  background: var(--gold-soft); margin-bottom: 8px;
}
.code-box .label { color: var(--gold); font-size: 12px; letter-spacing: 2px; }
.code-box .code { font-size: 34px; font-weight: 800; letter-spacing: 8px; margin-top: 4px; }
.hint { color: var(--faint); font-size: 12px; min-height: 18px; margin-bottom: 16px; }
.landing-card .btn { width: 100%; margin-top: 6px; }
.landing-steps { text-align: left; margin: 22px 0 0; padding: 16px 18px; border-radius: 16px;
  background: rgba(245,245,245,.04); color: var(--dim); font-size: 13px; }
.landing-steps li { margin: 6px 0; }
.landing-steps b { color: var(--text); }

@media (max-width: 900px) {
  .hero-grid, .download { grid-template-columns: 1fr; }
  .cards, .rewards { grid-template-columns: 1fr; }
  .qr-box { margin: 0 auto; }
  .nav-links { display: none; }
  .hero { padding: 48px 0 40px; }
  section { padding: 52px 0; }
  .download { padding: 26px; }
}