/* 音兔音乐 · 四页静态站样式表
   基调：#0e0f10 近黑底 + #ecece6 暖白 + intooo 播放器主题蓝 #5b9ce7；强调色取自播放器暗色主题的主色，与页面里的真实截图一致；标题与正文同为无衬线（标题加粗、字距收紧），
   品牌标识使用 intoo 播放器的官方 logo 图；层次靠细线网格与 1px 分隔线，不用霓虹渐变和大面积光晕。 */

:root {
  --bg: #0e0f10;
  --bg-raised: #15161a;
  --bg-sunk: #101113;
  --line: #26282d;
  --line-strong: #33363c;
  --text: #ecece6;
  --text-muted: #b5b1a8;
  --text-dim: #8f8d88;
  --accent: #5b9ce7;          /* intooo 播放器暗色主题 --color-primary */
  --accent-hi: #6ea8ee;       /* 播放器 --color-primary-hover */
  --accent-soft: #4d8ad4;     /* 深一档，用于描边/次要标记 */
  --accent-line: rgba(91, 156, 231, 0.34);
  --accent-tint: rgba(91, 156, 231, 0.09);
  --ink: #0e1722;             /* 蓝底上的深色文字 */

  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Noto Sans CJK SC", "Source Han Sans SC", system-ui, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;

  --measure: 74rem;
  --narrow: 46rem;
  --radius: 4px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 5.5rem;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 400 1.0625rem/1.72 var(--sans);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

h1, h2, h3, h4 { font-family: var(--sans); font-weight: 600; letter-spacing: -0.012em; margin: 0; }
h1 { font-size: clamp(2rem, 1.2rem + 3.6vw, 3.5rem); font-weight: 700; line-height: 1.14; letter-spacing: -0.022em; }
h2 { font-size: clamp(1.5rem, 1.1rem + 1.6vw, 2.25rem); line-height: 1.28; }
h3 { font-size: 1.2rem; line-height: 1.45; }
h4 { font-size: 1rem; line-height: 1.5; }
p { margin: 0 0 1rem; }

[lang="en"] h1, [lang="en"] h2 { letter-spacing: -0.028em; }

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-hi); text-decoration: underline; text-underline-offset: 3px; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img { display: block; max-width: 100%; }

:where(a, button, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.skip-link {
  position: absolute;
  left: 1rem; top: -5rem;
  z-index: 60;
  padding: 0.7rem 1.1rem;
  background: var(--accent);
  color: var(--ink);
  border-radius: var(--radius);
  font-weight: 600;
}
.skip-link:focus { top: 1rem; color: var(--ink); text-decoration: none; }

/* ---------- 控件 ---------- */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font: 600 1rem/1 var(--sans);
  padding: 0.95rem 1.5rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.18s ease, border-color 0.18s ease, color 0.18s ease;
}
.button:hover { text-decoration: none; }
.button-small { padding: 0.6rem 1rem; font-size: 0.9375rem; }
.button-primary { background: var(--accent); color: var(--ink); }
.button-primary:hover { background: var(--accent-hi); color: var(--ink); }
.button-ghost { background: transparent; color: var(--text); border-color: var(--line-strong); }
.button-ghost:hover { border-color: var(--accent); color: var(--accent); }
.button[aria-disabled="true"] { background: var(--bg-sunk); color: var(--text-dim); border-color: var(--line); cursor: not-allowed; }
.button[aria-disabled="true"]:hover { color: var(--text-dim); border-color: var(--line); }

.arrow::after { content: "→"; margin-left: 0.45rem; display: inline-block; transition: transform 0.16s ease; }
a:hover .arrow::after, .button:hover .arrow::after { transform: translateX(3px); }

.eyebrow {
  font: 600 0.75rem/1 var(--sans);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-soft);
  margin: 0 0 1.1rem;
}
.note { font-size: 0.875rem; color: var(--text-dim); line-height: 1.6; }
.spaced { margin-top: 2.25rem; }
.tight { margin: 0; }
.accent { color: var(--accent); display: inline-block; white-space: nowrap; }

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 页头 ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: rgba(14, 15, 16, 0.93);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(8px);
}
.header-inner {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 0.85rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
}
.brand { display: inline-flex; align-items: center; gap: 0.6rem; color: var(--text); text-decoration: none; margin-right: auto; }
.brand:hover { color: var(--text); text-decoration: none; }
.brand-logo { display: block; height: 1.45rem; width: auto; }
.brand-logo-lg { height: 1.8rem; }

.site-nav { display: flex; align-items: center; gap: 1.4rem; }
.site-nav > a, .site-nav > .nav-group > a {
  font-size: 0.9375rem;
  color: var(--text-muted);
  white-space: nowrap;
}
.site-nav a:hover { color: var(--accent); text-decoration: none; }
.site-nav a[aria-current="page"] { color: var(--accent); }
.site-nav a[aria-current="true"] { color: var(--text); border-bottom: 1px solid var(--accent-line); padding-bottom: 2px; }

.lang-toggle {
  font: 600 0.8125rem/1 var(--sans);
  letter-spacing: 0.04em;
  color: var(--text-muted);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  padding: 0.45rem 0.8rem;
  cursor: pointer;
}
.lang-toggle:hover { color: var(--accent); border-color: var(--accent); }

.header-tools { display: inline-flex; align-items: center; gap: 0.5rem; }
.menu-toggle { display: none; }
.menu-icon { font-size: 0.9rem; line-height: 1; }


/* ---------- 区块骨架 ---------- */

main { display: block; }
.section {
  max-width: var(--measure);
  margin: 0 auto;
  padding: clamp(3rem, 6vw, 5.25rem) 1.5rem;
  border-top: 1px solid var(--line);
}
.section-head { max-width: var(--narrow); margin-bottom: clamp(1.9rem, 4vw, 3rem); }
.section-head p { color: var(--text-muted); margin: 0.85rem 0 0; }
.section-head h2 { margin-bottom: 0; }

/* ---------- 首屏 ---------- */

.hero {
  max-width: var(--measure);
  margin: 0 auto;
  padding: clamp(2.75rem, 6vw, 5.5rem) 1.5rem clamp(3rem, 6vw, 5.5rem);
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
  gap: clamp(2rem, 4vw, 4rem);
  align-items: center;
  background-image:
    repeating-linear-gradient(90deg, rgba(236, 236, 230, 0.03) 0 1px, transparent 1px 6rem),
    repeating-linear-gradient(0deg, rgba(236, 236, 230, 0.03) 0 1px, transparent 1px 6rem);
}
.hero .lead { font-size: 1.125rem; color: var(--text-muted); max-width: 33rem; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.8rem; margin: 0 0 2.25rem; }
.hero-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.1rem;
  margin: 0;
  border-top: 1px solid var(--line);
  padding-top: 1.3rem;
}
.hero-facts dt { font-size: 0.75rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-dim); margin-bottom: 0.3rem; }
.hero-facts dd { margin: 0; font-size: 0.9375rem; color: var(--text-muted); line-height: 1.5; }
.hero-shot { margin: 0; }
.rows + .note { margin-top: 1.75rem; }

/* 两栏并排（文字 + 图） */
.split {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: clamp(2rem, 4vw, 3.5rem);
  align-items: start;
}
.split h3 { margin-top: 1.75rem; }
.split .note { margin: 0 0 1.1rem; }
.split .ticks { margin-top: 1.1rem; }

/* ---------- 窗口框 + 截图 ---------- */

.frame {
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--bg-raised);
  overflow: hidden;
}
.frame-bar {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.65rem 0.9rem;
  border-bottom: 1px solid var(--line);
  background: var(--bg-sunk);
}
.dots { display: inline-flex; gap: 5px; }
.dots i { width: 7px; height: 7px; border-radius: 50%; background: var(--line-strong); }
.frame-title { font: 400 0.8125rem/1 var(--mono); color: var(--text-dim); margin-right: auto; }
.badge {
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: var(--accent);
  border: 1px solid var(--accent-line);
  padding: 0.18rem 0.45rem;
  border-radius: 2px;
  white-space: nowrap;
}
.badge-neutral { color: var(--text-dim); border-color: var(--line); }
.frame-caption { font-size: 0.8125rem; color: var(--text-dim); margin: 0.75rem 0 0; }

.shot { width: 100%; height: auto; background: #000; }

/* 截图浏览 */
.gallery { display: grid; gap: 1.1rem; }
.gallery-view { position: relative; }
.gallery-view img { width: 100%; height: auto; }
.thumbs { display: flex; gap: 0.6rem; overflow-x: auto; padding-bottom: 0.35rem; scrollbar-width: thin; }
.thumb {
  flex: none;
  width: 9.5rem;
  padding: 0;
  background: var(--bg-sunk);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  cursor: pointer;
  color: var(--text-muted);
  font: 500 0.75rem/1.4 var(--sans);
  text-align: left;
  overflow: hidden;
}
.thumb img { width: 100%; height: 3.5rem; object-fit: cover; object-position: left top; opacity: 0.7; }
.thumb span { display: block; padding: 0.4rem 0.5rem 0.45rem; }
.thumb:hover { border-color: var(--line-strong); }
.thumb[aria-selected="true"] { border-color: var(--accent); color: var(--text); background: var(--accent-tint); }
.thumb[aria-selected="true"] img { opacity: 1; }

/* 手机截图 */
.phones { display: flex; flex-wrap: wrap; gap: 1.5rem; }
.phone {
  flex: 1 1 11rem;
  max-width: 14rem;
  border: 6px solid var(--line-strong);
  border-radius: 1.6rem;
  overflow: hidden;
  background: #000;
}
.phone img { width: 100%; height: auto; }
.phone figcaption { font-size: 0.75rem; color: var(--text-dim); padding: 0.5rem 0.65rem; background: var(--bg-sunk); border-top: 1px solid var(--line); }

/* ---------- 服务入口 ---------- */

.svc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(17rem, 100%), 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: 6px;
  overflow: hidden;
}
.svc { background: var(--bg-raised); padding: 1.6rem 1.5rem 1.7rem; display: flex; flex-direction: column; }
.svc h3 { margin-bottom: 0.5rem; }
.svc > p { color: var(--text-muted); font-size: 0.9375rem; }
.svc ul { margin: 0 0 1.25rem; display: grid; gap: 0.4rem; }
.svc li { font-size: 0.875rem; color: var(--text-muted); padding-left: 1.05rem; position: relative; }
.svc li::before { content: ""; position: absolute; left: 0; top: 0.62rem; width: 6px; height: 6px; border-radius: 50%; background: var(--accent-soft); }
.svc .button { margin-top: auto; align-self: flex-start; }
.svc-tag { font: 500 0.75rem/1 var(--mono); color: var(--text-dim); margin-bottom: 0.85rem; }

/* ---------- 编号条目（能力 / 特性）---------- */

.rows { display: grid; gap: 0; }
.rows > li {
  display: grid;
  grid-template-columns: 4rem minmax(0, 1fr);
  gap: 1rem;
  padding: 1.6rem 0;
  border-top: 1px solid var(--line);
}
.rows > li:first-child { border-top: 0; padding-top: 0; }
.rows h3 { font-size: 1.28rem; margin-bottom: 0.4rem; }
.rows p { margin: 0; color: var(--text-muted); max-width: 46rem; }
.num { font: 500 0.8125rem/1.9 var(--mono); color: var(--accent-soft); }

/* 功能网格（播放器页） */
.feat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(21rem, 100%), 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 6px; overflow: hidden; }
.feat { background: var(--bg-raised); padding: 1.7rem 1.6rem; }
.feat h3 { font-size: 1.25rem; margin-bottom: 0.55rem; }
.feat > p { color: var(--text-muted); font-size: 0.9375rem; }
.pills { display: flex; flex-wrap: wrap; gap: 0.4rem; margin-top: 1.1rem; }
.pill {
  font-size: 0.8125rem;
  color: var(--text-muted);
  border: 1px solid var(--line);
  background: var(--bg-sunk);
  padding: 0.3rem 0.6rem;
  border-radius: 3px;
}
.pill-mono { font-family: var(--mono); font-size: 0.75rem; letter-spacing: 0.04em; color: var(--text); }

/* ---------- 列表 / 勾选 ---------- */

.ticks { display: grid; gap: 0.55rem; }.ticks li { position: relative; padding-left: 1.4rem; font-size: 0.9375rem; color: var(--text-muted); }
.ticks li::before { content: ""; position: absolute; left: 0; top: 0.6rem; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }

/* ---------- 下载区 ---------- */

.dl-grid { display: flex; flex-wrap: wrap; gap: 0.75rem; }
.dl-meta { font: 400 0.75rem/1.5 var(--mono); color: var(--text-dim); margin-top: 0.3rem; }

/* ---------- 转存流程 ---------- */

.flow { display: grid; grid-template-columns: repeat(auto-fit, minmax(min(11rem, 100%), 1fr)); gap: 1px; background: var(--line); border: 1px solid var(--line); border-radius: 6px; overflow: hidden; }
.flow li { background: var(--bg-raised); padding: 1.1rem 1rem 1.2rem; }
.flow span { display: block; font: 500 0.75rem/1 var(--mono); color: var(--accent-soft); margin-bottom: 0.5rem; }
.flow p { margin: 0; font-size: 0.875rem; color: var(--text-muted); line-height: 1.55; }

/* ---------- 提示块 ---------- */

.callout { border: 1px solid var(--accent-line); background: var(--accent-tint); border-radius: 6px; padding: 1.6rem 1.5rem; }
.callout h2, .callout h3 { color: var(--accent); font-size: 1.25rem; margin-bottom: 0.5rem; }
.callout p { margin-bottom: 1rem; }
.notice { border: 1px solid var(--line-strong); border-left: 2px solid var(--accent); background: var(--bg-sunk); border-radius: 4px; padding: 1.3rem 1.4rem; }
.notice h3 { font-size: 1.05rem; margin-bottom: 0.4rem; }
.notice p { margin: 0; font-size: 0.9375rem; color: var(--text-muted); }

/* ---------- FAQ ---------- */

.faq details { border-top: 1px solid var(--line); }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary {
  cursor: pointer;
  padding: 1.15rem 2.5rem 1.15rem 0;
  position: relative;
  font-weight: 600;
  list-style: none;
  color: var(--text);
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "+";
  position: absolute;
  right: 0.4rem; top: 1.05rem;
  font: 400 1.15rem/1 var(--mono);
  color: var(--accent-soft);
}
.faq details[open] summary::after { content: "−"; }
.faq summary:hover { color: var(--accent); }
.faq .answer { padding: 0 0 1.25rem; color: var(--text-muted); max-width: 52rem; font-size: 0.9375rem; }
.faq .answer p:last-child { margin-bottom: 0; }

/* ---------- 页内目录 ---------- */

.toc { border: 1px solid var(--line); border-radius: 6px; background: var(--bg-raised); padding: 1.15rem 1.25rem; }
.toc h2 { font-size: 0.75rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-dim); margin-bottom: 0.75rem; font-family: var(--sans); }
.toc ol { display: grid; gap: 0.35rem; counter-reset: toc; }
.toc a { font-size: 0.9375rem; color: var(--text-muted); }
.toc a:hover { color: var(--accent); }

/* ---------- 子页页头 ---------- */

.page-head {
  max-width: var(--measure);
  margin: 0 auto;
  padding: clamp(2.25rem, 5vw, 4rem) 1.5rem clamp(1.75rem, 4vw, 3rem);
}
.crumb { font-size: 0.8125rem; margin-bottom: 1.1rem; }
.crumb a { color: var(--text-dim); }
.crumb a:hover { color: var(--accent); }
.page-head h1 { margin-bottom: 1rem; }
.page-head .lead { color: var(--text-muted); font-size: 1.125rem; max-width: 40rem; margin-bottom: 1.6rem; }

/* ---------- 页脚 ---------- */

.site-footer { border-top: 1px solid var(--line); background: var(--bg-sunk); margin-top: clamp(2rem, 5vw, 4rem); }
.footer-inner {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 2.5rem 1.5rem 2.25rem;
  display: grid;
  grid-template-columns: minmax(0, 1.4fr) repeat(2, minmax(0, 1fr));
  gap: 2rem;
}
.footer-brand p { font-size: 0.9375rem; color: var(--text-muted); max-width: 30rem; }
.footer-col h3 { font-size: 0.75rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--text-dim); margin-bottom: 0.8rem; font-family: var(--sans); }
.footer-col ul { display: grid; gap: 0.45rem; }
.footer-col a { font-size: 0.9375rem; color: var(--text-muted); }
.footer-col a:hover { color: var(--accent); }
.footer-bottom {
  max-width: var(--measure);
  margin: 0 auto;
  padding: 1.1rem 1.5rem 1.6rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  align-items: baseline;
}
.footer-bottom p, .footer-bottom a { font-size: 0.8125rem; color: var(--text-dim); margin: 0; }

/* ---------- 响应式 ---------- */

@media (max-width: 64rem) {
  .hero { grid-template-columns: minmax(0, 1fr); }
  .split { grid-template-columns: minmax(0, 1fr); }
  .hero-copy { order: 1; }
  .hero-shot { order: 2; }
  .header-inner { gap: 1rem; }
}

@media (max-width: 48rem) {
  html { scroll-behavior: auto; }
  .header-inner { flex-wrap: wrap; padding: 0.75rem 1.15rem; }
  .site-nav {
    display: none;
    order: 3;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.15rem;
    padding-top: 0.5rem;
    border-top: 1px solid var(--line);
  }
  .site-nav.is-open { display: flex; }
  .site-nav a { display: block; padding: 0.55rem 0; font-size: 1rem; }
  .header-tools { display: inline-flex; gap: 0.5rem; align-items: center; }
  .menu-toggle {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    font: 600 0.8125rem/1 var(--sans);
    color: var(--text-muted);
    background: transparent;
    border: 1px solid var(--line-strong);
    border-radius: var(--radius);
    padding: 0.5rem 0.7rem;
    cursor: pointer;
  }
  .menu-toggle:hover { color: var(--accent); border-color: var(--accent); }
  .menu-toggle[aria-expanded="true"] { color: var(--text); border-color: var(--accent); }
  .hero, .section, .page-head { padding-left: 1.15rem; padding-right: 1.15rem; }
  .hero-facts { grid-template-columns: minmax(0, 1fr); gap: 0.85rem; }
  .rows > li { grid-template-columns: 2.6rem minmax(0, 1fr); }
  .thumb { width: 8rem; }
  .footer-inner { grid-template-columns: minmax(0, 1fr); gap: 1.75rem; }
}

@media (max-width: 30rem) {
  .hero-actions { flex-direction: column; align-items: stretch; }
  .hero-actions .button { width: 100%; }
  .dl-grid { flex-direction: column; align-items: stretch; }
  .phones { gap: 1rem; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: 0.001s !important; transition-duration: 0.001s !important; }
}