/* Album Radar 官网 —— 暗色音乐杂志风
 * 配色取自 App 图标：近黑背景 + 青绿雷达光
 * 标题衬线（杂志感），正文系统无衬线
 */
:root {
  --bg: #0a0c10;
  --bg-soft: #0d1117;
  --card: #10151d;
  --line: #1e2633;
  --txt: #f2f5f9;
  --mut: #97a1b0;
  --dim: #5d6875;
  --accent: #00f5cc;
  --accent-dim: #00c9a7;
  --radius: 14px;
  --maxw: 1080px;
  --serif: "Georgia", "Songti SC", "Hiragino Mincho ProN", "Noto Serif SC", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans", "Noto Sans SC", "Yu Gothic UI", "Meiryo", sans-serif;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--txt);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(10, 12, 16, 0.82);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(30, 38, 51, 0.6);
}
.site-header .container {
  display: flex;
  align-items: center;
  gap: 16px;
  height: 60px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--txt);
  font-weight: 700;
  letter-spacing: 0.01em;
}
.brand:hover { text-decoration: none; }
.brand img { width: 28px; height: 28px; border-radius: 7px; }
.brand em {
  font-style: normal;
  color: var(--accent);
  font-size: 0.82em;
}
.site-nav {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 22px;
}
.site-nav a {
  color: var(--mut);
  font-size: 0.92rem;
  font-weight: 500;
}
.site-nav a:hover { color: var(--txt); text-decoration: none; }

.lang-switch {
  display: inline-flex;
  border: 1px solid var(--line);
  border-radius: 999px;
  overflow: hidden;
  flex: none;
}
.lang-switch button {
  background: transparent;
  border: 0;
  color: var(--mut);
  font-size: 0.82rem;
  padding: 4px 12px;
  cursor: pointer;
  font-family: var(--sans);
  transition: background 0.15s, color 0.15s;
}
.lang-switch button:hover { color: var(--txt); }
.lang-switch button.is-active {
  background: var(--accent);
  color: #06231d;
  font-weight: 700;
}

/* ---------- Hero ---------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 96px 0 72px;
  background:
    radial-gradient(1100px 500px at 75% -10%, rgba(0, 245, 204, 0.10), transparent 60%),
    radial-gradient(800px 420px at 10% 110%, rgba(10, 30, 60, 0.55), transparent 65%),
    var(--bg);
}
/* 氛围雷达圆环（装饰，非截图 mock） */
.radar-deco {
  position: absolute;
  right: -160px;
  top: 50%;
  transform: translateY(-50%);
  width: 520px;
  height: 520px;
  pointer-events: none;
  opacity: 0.5;
}
.radar-deco .ring {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  border: 1px solid rgba(0, 245, 204, 0.22);
}
.radar-deco .ring.r2 { inset: 24%; }
.radar-deco .ring.r3 { inset: 48%; }
.radar-deco .ring.r4 { inset: 72%; }
.radar-deco .sweep {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(from 0deg, rgba(0, 245, 204, 0.22), transparent 22%);
  animation: radar-sweep 7s linear infinite;
}
.radar-deco .blip {
  position: absolute;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #fff;
  box-shadow: 0 0 12px 3px rgba(0, 245, 204, 0.9);
  animation: radar-blink 2.6s ease-in-out infinite;
}
@keyframes radar-sweep { to { transform: rotate(360deg); } }
@keyframes radar-blink {
  0%, 100% { opacity: 0.25; }
  50% { opacity: 1; }
}

.hero-inner { position: relative; z-index: 1; max-width: 720px; }
.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 700;
  margin: 0 0 18px;
}
.hero h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(2.4rem, 6vw, 4.1rem);
  line-height: 1.15;
  margin: 0 0 22px;
  letter-spacing: -0.01em;
}
.hero h1 .accent-text {
  color: var(--accent);
  font-style: italic;
}
.hero-sub {
  color: var(--mut);
  font-size: clamp(1.02rem, 2vw, 1.18rem);
  margin: 0 0 34px;
  max-width: 620px;
}
.cta-row { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.btn {
  display: inline-block;
  border-radius: 999px;
  padding: 14px 30px;
  font-size: 1rem;
  font-weight: 700;
  cursor: pointer;
  border: 1px solid var(--line);
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}
.btn-primary {
  background: var(--accent);
  color: #06231d;
  border-color: var(--accent);
}
.btn-primary:hover {
  background: #2dffd6;
  transform: translateY(-1px);
  text-decoration: none;
  box-shadow: 0 6px 24px rgba(0, 245, 204, 0.25);
}
.btn-disabled {
  background: transparent;
  color: var(--mut);
  cursor: not-allowed;
  border-style: dashed;
}
.cta-note { color: var(--dim); font-size: 0.85rem; }

/* ---------- 通用区块 ---------- */
.section { padding: 84px 0; }
.section-alt { background: var(--bg-soft); border-block: 1px solid rgba(30, 38, 51, 0.5); }
.section-head { max-width: 680px; margin-bottom: 44px; }
.section-head h2 {
  font-family: var(--serif);
  font-size: clamp(1.7rem, 3.4vw, 2.4rem);
  font-weight: 600;
  margin: 0 0 14px;
  letter-spacing: -0.01em;
}
.section-head p { color: var(--mut); margin: 0; }

/* ---------- RADAR Score ---------- */
.score-grid {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 56px;
  align-items: start;
}
.score-big {
  position: relative;
  aspect-ratio: 1 / 1;
  max-width: 280px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 50% 40%, rgba(0, 245, 204, 0.12), transparent 62%),
    var(--card);
  border: 1px solid rgba(0, 245, 204, 0.3);
}
.score-big::before,
.score-big::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  border: 1px solid rgba(0, 245, 204, 0.16);
}
.score-big::before { inset: 12%; }
.score-big::after { inset: 26%; }
.score-big .num {
  font-family: var(--serif);
  font-size: 6.4rem;
  font-weight: 700;
  line-height: 1;
  color: var(--accent);
  text-shadow: 0 0 32px rgba(0, 245, 204, 0.45);
}
.score-big .unit {
  position: absolute;
  bottom: 17%;
  font-size: 0.72rem;
  letter-spacing: 0.28em;
  color: var(--mut);
  font-weight: 700;
}
.score-info p { color: var(--mut); margin: 0 0 22px; }
.factors {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  list-style: none;
  padding: 0;
  margin: 0 0 14px;
}
.factors li {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
  background: var(--card);
}
.factors .f-name {
  display: block;
  font-size: 0.8rem;
  color: var(--dim);
  letter-spacing: 0.06em;
}
.factors .f-val {
  display: block;
  font-weight: 700;
  font-size: 1.02rem;
  margin-top: 3px;
}
.score-note {
  font-size: 0.88rem;
  color: var(--dim);
  font-style: italic;
}

/* ---------- 功能卡片 ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 16px;
}
.feature {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 26px;
  background: var(--card);
  transition: border-color 0.2s, transform 0.2s;
}
.feature:hover {
  border-color: rgba(0, 245, 204, 0.45);
  transform: translateY(-2px);
}
.feature .f-icon {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 11px;
  background: rgba(0, 245, 204, 0.1);
  border: 1px solid rgba(0, 245, 204, 0.3);
  color: var(--accent);
  font-size: 1.15rem;
  margin-bottom: 16px;
}
.feature h3 {
  font-family: var(--serif);
  font-size: 1.16rem;
  margin: 0 0 8px;
  font-weight: 600;
}
.feature p { color: var(--mut); font-size: 0.95rem; margin: 0; }

/* ---------- 数据来源 ---------- */
.sources-list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  list-style: none;
  padding: 0;
  margin: 0;
}
.sources-list li {
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 10px 22px;
  font-weight: 600;
  font-size: 0.98rem;
  background: var(--card);
  color: var(--txt);
}

/* ---------- FAQ ---------- */
.faq-list { max-width: 760px; }
.faq-list details {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  margin-bottom: 12px;
  overflow: hidden;
}
.faq-list summary {
  cursor: pointer;
  padding: 18px 22px;
  font-weight: 600;
  font-size: 1.02rem;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
}
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after {
  content: "+";
  font-size: 1.4rem;
  color: var(--accent);
  line-height: 1;
  transition: transform 0.2s;
  flex: none;
}
.faq-list details[open] summary::after { transform: rotate(45deg); }
.faq-list details p {
  margin: 0;
  padding: 0 22px 20px;
  color: var(--mut);
  font-size: 0.96rem;
}

/* ---------- 页脚 CTA ---------- */
.cta-band {
  text-align: center;
  padding: 96px 0;
  background:
    radial-gradient(760px 340px at 50% 0%, rgba(0, 245, 204, 0.09), transparent 70%),
    var(--bg);
}
.cta-band h2 {
  font-family: var(--serif);
  font-size: clamp(1.9rem, 4vw, 2.8rem);
  margin: 0 0 12px;
  font-weight: 600;
}
.cta-band p { color: var(--mut); margin: 0 0 28px; }

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid rgba(30, 38, 51, 0.6);
  padding: 44px 0 56px;
  background: var(--bg-soft);
}
.site-footer .container {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 24px;
  align-items: start;
}
.footer-brand { font-weight: 700; margin-bottom: 6px; }
.footer-tagline { color: var(--dim); font-size: 0.9rem; margin: 0 0 14px; max-width: 460px; }
.footer-links a { color: var(--mut); font-size: 0.9rem; }
.footer-links a:hover { color: var(--txt); }
.footer-legal {
  grid-column: 1 / -1;
  border-top: 1px solid rgba(30, 38, 51, 0.5);
  padding-top: 18px;
  color: var(--dim);
  font-size: 0.82rem;
}

/* ---------- 隐私页 ---------- */
.privacy-hero { padding: 72px 0 36px; }
.privacy-hero h1 {
  font-family: var(--serif);
  font-size: clamp(2rem, 4.5vw, 3rem);
  margin: 0 0 10px;
  font-weight: 600;
}
.privacy-meta { color: var(--dim); font-size: 0.88rem; margin-bottom: 8px; }
.privacy-body {
  max-width: 760px;
  padding-bottom: 90px;
}
.privacy-body .lead {
  font-size: 1.06rem;
  color: var(--txt);
  border-left: 3px solid var(--accent);
  padding-left: 18px;
  margin: 26px 0 40px;
}
.privacy-body h2 {
  font-family: var(--serif);
  font-size: 1.35rem;
  margin: 42px 0 12px;
  font-weight: 600;
}
.privacy-body p { color: var(--mut); margin: 0 0 16px; }
.privacy-body ul {
  color: var(--mut);
  padding-left: 22px;
  margin: 0 0 16px;
}
.privacy-body li { margin-bottom: 6px; }
.privacy-back {
  display: inline-block;
  margin-bottom: 34px;
  color: var(--mut);
  font-size: 0.92rem;
}
.privacy-back:hover { color: var(--txt); text-decoration: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 860px) {
  .score-grid { grid-template-columns: 1fr; gap: 34px; }
  .score-big { max-width: 230px; }
  .radar-deco { right: -240px; opacity: 0.32; }
  .site-footer .container { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  body { font-size: 16px; }
  .container { padding: 0 20px; }
  .hero { padding: 64px 0 56px; }
  .section { padding: 64px 0; }
  .site-nav a.nav-link { display: none; } /* 移动端隐藏长导航，仅保留语言切换 */
  .site-header .container { height: 56px; }
  .brand { gap: 8px; }
  .brand span { font-size: 0.95rem; }
  .site-nav { gap: 10px; }
  .lang-switch button { padding: 4px 9px; font-size: 0.78rem; }
  .factors { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr; }
  .cta-band { padding: 72px 0; }
  .privacy-hero { padding: 52px 0 28px; }
}