/* ===================================================
   倾听 (QINGTING) — 官方现代杂志美学与震撼动效设计系统
   设计理念：Less noise. More music.
   融合老版人文诗意、杂志大构图与现代毛玻璃拟态、GPU加速黑胶动效
   =================================================== */

:root {
  /* 品牌色彩体系 */
  --ink: #111218;
  --paper: #f4f4f1;
  --paper-elevated: #ffffff;
  --muted: #77787d;
  --line: #d7d7d2;
  --line-light: rgba(0, 0, 0, 0.06);
  --accent: #3f46c8;
  --accent-light: #575ee8;
  --lime: #c7ff3e;
  --sky: #0ea5e9;

  /* 基础字体与阴影 */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  --shadow-sm: 0 4px 12px rgba(17, 18, 24, 0.04);
  --shadow-md: 0 14px 32px rgba(17, 18, 24, 0.08);
  --shadow-lg: 0 24px 50px rgba(17, 18, 24, 0.12);
  --shadow-vinyl: 15px 24px 45px rgba(0, 0, 0, 0.35);

  color-scheme: light;
}

/* 深色模式变量切换 */
[data-theme="dark"] {
  --ink: #f4f4f8;
  --paper: #0c0d12;
  --paper-elevated: #151720;
  --muted: #8b8d99;
  --line: #272935;
  --line-light: rgba(255, 255, 255, 0.07);
  --accent: #4f57ee;
  --accent-light: #6a71fa;
  --lime: #c7ff3e;
  --sky: #38bdf8;

  --shadow-sm: 0 4px 12px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 16px 36px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 26px 60px rgba(0, 0, 0, 0.7);
  --shadow-vinyl: 15px 26px 50px rgba(0, 0, 0, 0.6);

  color-scheme: dark;
}

/* 基础重置 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 96px;
  background-color: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 0.25s ease, color 0.25s ease;
}

body {
  position: relative;
  overflow-x: hidden;
  background-color: var(--paper);
  min-height: 100vh;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all 0.2s ease;
}

button {
  font: inherit;
  color: inherit;
  border: 0;
  background: none;
  cursor: pointer;
}

button, a, summary {
  -webkit-tap-highlight-color: transparent;
}

button:focus-visible, a:focus-visible, summary:focus-visible, [tabindex]:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 4px;
}

::selection {
  background: var(--lime);
  color: #111218;
}

/* 无障碍跳过链接 */
.skip-link {
  position: fixed;
  top: -100px;
  left: 20px;
  z-index: 1000;
  padding: 12px 20px;
  background: var(--lime);
  color: #111218;
  font-weight: 700;
  border-radius: 4px;
  transition: top 0.2s;
}
.skip-link:focus {
  top: 15px;
}

/* ================= 导航栏 (Header) ================= */
.site-header {
  height: 84px;
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  background: rgba(244, 244, 241, 0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--line);
  transition: background-color 0.25s, border-color 0.25s;
}

[data-theme="dark"] .site-header {
  background: rgba(12, 13, 18, 0.88);
}

.header-inner {
  max-width: 1360px;
  height: 100%;
  margin: 0 auto;
  padding: 0 4.5vw;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand-icon {
  width: 36px;
  height: 36px;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(63, 70, 200, 0.25);
  flex-shrink: 0;
}
.brand-icon img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.brand-text span {
  font-weight: 900;
  font-size: 24px;
  letter-spacing: -0.03em;
  display: block;
  line-height: 1;
}
.brand-text small {
  font-size: 8px;
  letter-spacing: 2px;
  color: var(--muted);
  display: block;
  margin-top: 4px;
  font-weight: 700;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 34px;
  font-size: 13px;
  font-weight: 700;
}
.nav-links a {
  position: relative;
  padding: 8px 0;
  color: var(--muted);
}
.nav-links a:hover {
  color: var(--ink);
}
.nav-links a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  right: 100%;
  height: 2px;
  background: var(--accent);
  transition: right 0.22s ease;
}
.nav-links a:hover::after {
  right: 0;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 14px;
}

/* 主题切换开关 */
.theme-toggle-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: var(--paper-elevated);
  color: var(--ink);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s ease;
}
.theme-toggle-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: rotate(15deg);
}

.button-header {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 800;
  padding: 8px 18px;
  background: var(--ink);
  color: var(--paper);
  border-radius: 4px;
  transition: all 0.2s ease;
}
.button-header:hover {
  background: var(--accent);
  color: #fff;
  transform: translateY(-1px);
}
.cta-arrow {
  color: var(--lime);
  font-weight: 900;
  font-size: 14px;
}

.menu-button {
  display: none;
}

/* ================= 按钮通用规范 ================= */
.button {
  min-height: 50px;
  padding: 0 22px;
  display: inline-flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  font-size: 13px;
  font-weight: 800;
  border-radius: 6px;
  transition: transform 0.2s, background-color 0.2s, color 0.2s, box-shadow 0.2s;
  white-space: nowrap;
}
.button:hover {
  transform: translateY(-2px);
}
.button-dark {
  background: var(--ink);
  color: var(--paper);
  box-shadow: 0 8px 20px rgba(17, 18, 24, 0.15);
}
.button-dark:hover {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 10px 25px rgba(63, 70, 200, 0.35);
}
.button-lime {
  background: var(--lime);
  color: #111218;
  font-weight: 800;
  box-shadow: 0 8px 20px rgba(199, 255, 62, 0.25);
}
.button-lime:hover {
  background: #ffffff;
  color: #111218;
  box-shadow: 0 12px 28px rgba(255, 255, 255, 0.3);
}
.button-outline {
  border: 1px solid var(--line);
  background: transparent;
  color: var(--ink);
}
.button-outline:hover {
  background: var(--paper-elevated);
  border-color: var(--ink);
}
.btn-icon {
  font-size: 18px;
  line-height: 1;
}

.text-link {
  font-size: 13px;
  font-weight: 800;
  border-bottom: 2px solid var(--ink);
  padding-bottom: 4px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.text-link span:last-child {
  color: var(--accent);
  font-size: 16px;
}
.text-link:hover {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

/* ================= 00. HERO 首屏 (杂志大排版 × 震撼黑胶动效) ================= */
.hero {
  padding: 130px 4.5vw 36px;
  min-height: 720px;
  max-width: 1360px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 0.95fr 1.05fr;
  gap: 30px 5vw;
  align-items: center;
}

.hero-copy {
  align-self: center;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 11px;
  letter-spacing: 1.5px;
  font-weight: 800;
  margin-bottom: 28px;
  color: var(--muted);
}
.eyebrow-line {
  width: 26px;
  height: 2px;
  background: var(--accent);
}

.hero h1 {
  font-size: clamp(48px, 5.8vw, 86px);
  font-weight: 900;
  letter-spacing: -0.04em;
  line-height: 1.12;
  margin-bottom: 22px;
}
.stroke-title {
  color: transparent;
  -webkit-text-stroke: 1.8px var(--ink);
  font-weight: 900;
}
[data-theme="dark"] .stroke-title {
  -webkit-text-stroke: 1.8px var(--ink);
}

.hero-intro {
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
  margin-bottom: 32px;
  max-width: 520px;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-bottom: 24px;
}

.smart-detect-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 22px;
  padding: 6px 12px;
  background: var(--line-light);
  border-radius: 4px;
  width: fit-content;
}
.smart-detect-meta strong {
  color: var(--ink);
}

.hero-version {
  font-size: 10px;
  letter-spacing: 0.5px;
  color: var(--muted);
  display: flex;
  align-items: center;
  gap: 8px;
}
.hero-version i {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--lime);
  box-shadow: 0 0 8px var(--lime);
  animation: pulseDot 2s infinite;
}
@keyframes pulseDot {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

/* 右侧：黑胶唱机与音频波形展台 (Sound in Motion) */
.hero-visual {
  height: 520px;
  position: relative;
  overflow: hidden;
  background: #121319;
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  isolation: isolate;
  border: 1px solid rgba(255, 255, 255, 0.08);
}

.visual-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  pointer-events: none;
}

.hero-visual::before {
  content: "";
  position: absolute;
  inset: 52% -10% -20% -10%;
  background: var(--accent);
  transform: skewY(-12deg);
  z-index: -1;
  opacity: 0.85;
}

.visual-label {
  position: absolute;
  font-size: 9px;
  letter-spacing: 1.5px;
  color: #9ea0af;
  top: 24px;
  left: 24px;
  font-weight: 700;
}

/* 跳动音频信号灯 */
.signal {
  position: absolute;
  right: 24px;
  top: 22px;
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 20px;
}
.signal i {
  background: var(--lime);
  width: 3px;
  height: 6px;
  border-radius: 1px;
  animation: signalWave 1.4s ease-in-out infinite alternate;
}
.signal i:nth-child(1) { height: 8px; animation-delay: -0.2s; }
.signal i:nth-child(2) { height: 16px; animation-delay: -0.5s; }
.signal i:nth-child(3) { height: 20px; animation-delay: -0.1s; }
.signal i:nth-child(4) { height: 12px; animation-delay: -0.7s; }
.signal i:nth-child(5) { height: 7px; animation-delay: -0.3s; }
@keyframes signalWave {
  0% { transform: scaleY(0.3); }
  100% { transform: scaleY(1.1); }
}

/* 倾斜唱片封套 (极具艺术冲击力) */
.record-sleeve {
  position: absolute;
  top: 16%;
  left: 7%;
  width: 58%;
  aspect-ratio: 1;
  background: var(--lime);
  color: #111218;
  transform: rotate(-9deg);
  padding: 24px;
  overflow: hidden;
  box-shadow: 0 20px 48px rgba(0, 0, 0, 0.45);
  border-radius: 6px;
  z-index: 2;
  transition: transform 0.3s ease;
}
.record-sleeve:hover {
  transform: rotate(-7deg) translateY(-4px);
}
.record-sleeve > span {
  position: relative;
  font-size: clamp(20px, 2.2vw, 32px);
  line-height: 1.22;
  font-weight: 900;
  letter-spacing: -0.04em;
  z-index: 1;
  display: block;
}
.record-sleeve small {
  display: block;
  font-size: 7px;
  letter-spacing: 1.2px;
  margin-top: 12px;
  font-weight: 800;
  color: rgba(17, 18, 24, 0.7);
}
.record-sleeve b {
  position: absolute;
  bottom: 16px;
  left: 22px;
  font-size: 52px;
  letter-spacing: -2px;
  z-index: 1;
  line-height: 1;
  font-weight: 900;
}
.sleeve-orbit {
  position: absolute;
  width: 130%;
  height: 130%;
  border: 1px solid rgba(17, 18, 24, 0.2);
  border-radius: 50%;
  left: 28%;
  top: 22%;
  box-shadow:
    0 0 0 16px rgba(17, 18, 24, 0.05),
    0 0 0 17px rgba(17, 18, 24, 0.15),
    0 0 0 36px rgba(17, 18, 24, 0.05),
    0 0 0 37px rgba(17, 18, 24, 0.15),
    0 0 0 58px rgba(17, 18, 24, 0.05),
    0 0 0 59px rgba(17, 18, 24, 0.15);
  pointer-events: none;
}

/* 拟真实体黑胶大唱片 (带GPU硬件加速32s旋转与高光反射) */
.vinyl {
  position: absolute;
  width: 66%;
  aspect-ratio: 1;
  border-radius: 50%;
  top: 20%;
  left: 31%;
  background: repeating-radial-gradient(
    circle,
    #0d0e13 0 2px,
    #24252c 3px,
    #0d0e13 4px,
    #1a1b22 5px
  );
  border: 1px solid #444652;
  box-shadow: var(--shadow-vinyl);
  display: grid;
  place-items: center;
  animation: spinVinyl 32s linear infinite;
  cursor: pointer;
  z-index: 1;
  transform-origin: center center;
  will-change: transform;
}
.vinyl.paused {
  animation-play-state: paused;
}
@keyframes spinVinyl {
  to { transform: rotate(360deg); }
}

/* 唱片光泽折射反射层 */
.vinyl-reflection {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: conic-gradient(
    transparent,
    rgba(255, 255, 255, 0.14),
    transparent 28%,
    rgba(255, 255, 255, 0.06),
    transparent 62%,
    rgba(255, 255, 255, 0.16),
    transparent
  );
  pointer-events: none;
}

/* 唱片中心圆形贴纸 */
.vinyl-label {
  width: 36%;
  aspect-ratio: 1;
  border-radius: 50%;
  background: var(--accent);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: #fff;
  position: relative;
  border: 2px solid rgba(255, 255, 255, 0.25);
  box-shadow: inset 0 0 12px rgba(0, 0, 0, 0.4);
}
.vinyl-label::after {
  content: "";
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #111218;
  border: 2px solid #ddd;
}
.vinyl-label span {
  font-size: 7px;
  letter-spacing: 2px;
  position: absolute;
  top: 14%;
  font-weight: 700;
}
.vinyl-label b {
  font-size: 20px;
  font-weight: 900;
  position: absolute;
  bottom: 20%;
  letter-spacing: -1px;
}
.vinyl-label small {
  font-size: 4px;
  letter-spacing: 0.5px;
  position: absolute;
  bottom: 10%;
  opacity: 0.8;
}

/* 毛玻璃悬浮动态播放胶囊 */
.floating-player {
  position: absolute;
  bottom: 14%;
  left: 7%;
  right: 8%;
  min-height: 76px;
  padding: 14px 18px;
  background: rgba(244, 244, 241, 0.94);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid rgba(255, 255, 255, 0.9);
  border-radius: 12px;
  display: flex;
  gap: 14px;
  align-items: center;
  transform: rotate(-3deg);
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.4);
  z-index: 3;
  color: #111218;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.floating-player:hover {
  transform: rotate(-1deg) translateY(-3px);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.5);
}
.mini-art {
  width: 48px;
  height: 48px;
  flex-shrink: 0;
  border-radius: 8px;
  position: relative;
  overflow: hidden;
  background: var(--accent);
  display: grid;
  place-items: center;
}
.mini-art-ring {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid var(--lime);
  animation: pulseDot 2.5s infinite;
}
.player-info strong {
  display: block;
  font-size: 14px;
  font-weight: 800;
}
.player-info span {
  display: block;
  font-size: 10px;
  color: #636573;
  margin-top: 3px;
}

/* 实时音频频谱律动柱 */
.mini-bars {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  margin-left: auto;
  height: 26px;
}
.mini-bars i {
  width: 4px;
  height: 8px;
  background: var(--accent);
  border-radius: 2px;
  animation: equalize 1.2s ease-in-out infinite alternate;
}
.mini-bars i:nth-child(1) { height: 10px; animation-delay: -0.2s; }
.mini-bars i:nth-child(2) { height: 24px; animation-delay: -0.6s; }
.mini-bars i:nth-child(3) { height: 16px; animation-delay: -0.35s; }
.mini-bars i:nth-child(4) { height: 9px; animation-delay: -0.8s; }
@keyframes equalize {
  0% { transform: scaleY(0.25); }
  100% { transform: scaleY(1); }
}

.visual-bottom {
  position: absolute;
  bottom: 18px;
  left: 24px;
  right: 24px;
  display: flex;
  justify-content: space-between;
  font-size: 8px;
  letter-spacing: 1px;
  color: #fff;
  z-index: 1;
}
.visual-bottom i {
  display: inline-block;
  width: 5px;
  height: 5px;
  background: var(--lime);
  border-radius: 50%;
  margin-right: 6px;
}

.hero-meta {
  grid-column: 1 / -1;
  display: flex;
  gap: 28px;
  align-items: center;
  font-size: 10px;
  letter-spacing: 1.2px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 20px;
  margin-top: 10px;
}
.hero-meta a {
  margin-left: auto;
  font-weight: 800;
  color: var(--ink);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.hero-meta a span {
  color: var(--accent);
  font-size: 18px;
}

/* ================= 01. MANIFESTO 理念篇章 ================= */
.section {
  padding: 80px 4.5vw;
  max-width: 1360px;
  margin: 0 auto;
}
.section-index {
  font-size: 10px;
  letter-spacing: 1.4px;
  font-weight: 800;
  color: var(--muted);
  margin-bottom: 24px;
}

.manifesto {
  display: grid;
  grid-template-columns: 140px 1.35fr 1fr;
  gap: 4vw;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  align-items: start;
}
.manifesto h2 {
  font-size: clamp(28px, 3.2vw, 48px);
  line-height: 1.28;
  letter-spacing: -0.03em;
  font-weight: 900;
}
.manifesto h2 span {
  color: var(--accent);
}
.manifesto-note {
  font-size: 13px;
  line-height: 1.95;
  color: var(--muted);
}
.manifesto-note p:first-child {
  color: var(--ink);
  font-weight: 800;
  font-size: 15px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
  margin-bottom: 14px;
}

/* ================= 02. EXPERIENCE 播放体验演播台 ================= */
.experience {
  background: #111218;
  color: #fff;
  border-radius: 20px;
  margin-top: 40px;
  margin-bottom: 40px;
  box-shadow: var(--shadow-lg);
}
.experience .section-index {
  color: #9293a0;
}
.experience .section-heading h2 > span {
  color: var(--lime);
}
.experience .section-heading > p {
  color: #a4a5b2;
}

.section-heading {
  display: grid;
  grid-template-columns: 1fr 0.85fr;
  align-items: end;
  gap: 5vw;
  margin-bottom: 44px;
}
.section-heading h2 {
  font-size: clamp(34px, 4vw, 56px);
  line-height: 1.18;
  letter-spacing: -0.035em;
  font-weight: 900;
}
.section-heading > p {
  justify-self: end;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 420px;
}

.experience-layout {
  display: grid;
  grid-template-columns: 0.72fr 1.6fr;
  gap: 5vw;
  align-items: start;
}

/* 演播选项卡 */
.mode-controls {
  display: flex;
  flex-direction: column;
}
.mode-controls button {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  text-align: left;
  width: 100%;
  padding: 26px 0;
  background: transparent;
  border-top: 1px solid #282a35;
  color: #8c8e9b;
  transition: all 0.2s ease;
}
.mode-controls button:last-of-type {
  border-bottom: 1px solid #282a35;
}
.mode-controls button > span {
  font-size: 11px;
  font-weight: 800;
  padding-top: 4px;
  color: #636573;
}
.mode-controls strong {
  font-size: 20px;
  display: block;
  margin-bottom: 8px;
  font-weight: 800;
}
.mode-controls small {
  font-size: 11px;
  color: #8c8e9b;
}
.mode-controls b {
  font-size: 20px;
  margin-left: auto;
  font-weight: 400;
  transition: transform 0.2s;
}
.mode-controls button[aria-selected="true"],
.mode-controls button.active {
  color: #fff;
}
.mode-controls button[aria-selected="true"] > span,
.mode-controls button.active > span {
  color: var(--lime);
}
.mode-controls button[aria-selected="true"] strong,
.mode-controls button.active strong {
  color: var(--lime);
}
.mode-controls button[aria-selected="true"] b,
.mode-controls button.active b {
  color: var(--lime);
  transform: translate(2px, -2px);
}
.mode-controls button:hover {
  color: #fff;
}
.preview-note {
  font-size: 10px;
  color: #727482;
  margin-top: 24px;
  line-height: 1.7;
}

/* 演播台视窗 */
.mode-stage {
  min-width: 0;
}
.mode-panel {
  height: 390px;
  border: 1px solid #333544;
  position: relative;
  overflow: hidden;
  border-radius: 14px;
  background: #191b24;
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.4);
}
.mode-panel[hidden] {
  display: none !important;
}

.app-chrome {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  font-size: 10px;
  color: #a4a6ba;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.02);
}
.traffic-lights {
  display: flex;
  gap: 6px;
}
.traffic-lights i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #ff5f57;
}
.traffic-lights i:nth-child(2) { background: #febc2e; }
.traffic-lights i:nth-child(3) { background: #28c840; }
.chrome-tag {
  font-size: 9px;
  background: rgba(199, 255, 62, 0.15);
  color: var(--lime);
  padding: 2px 8px;
  border-radius: 3px;
  font-weight: 700;
}

/* 模式 1: 沉浸歌词 */
.immersive-panel {
  background: radial-gradient(ellipse at 15% 30%, #35396b, transparent 65%), #191b26;
}
.immersive-body {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  align-items: center;
  gap: 36px;
  padding: 30px 38px;
  height: calc(100% - 47px);
}
.album-art {
  height: 170px;
  width: 170px;
  max-width: 100%;
  background: #2a2e45;
  color: #e2e5f5;
  position: relative;
  overflow: hidden;
  padding: 16px;
  border-radius: 12px;
  margin-bottom: 14px;
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.45);
  border: 1px solid rgba(255, 255, 255, 0.1);
}
.album-art > span {
  font-size: 26px;
  line-height: 0.95;
  font-weight: 900;
  position: relative;
  z-index: 1;
  display: block;
}
.album-art > i {
  width: 150px;
  height: 190px;
  border-radius: 50% 50% 0 0;
  position: absolute;
  background: var(--accent);
  transform: rotate(32deg);
  top: 50px;
  left: 70px;
  opacity: 0.7;
}
.album-art small {
  position: absolute;
  bottom: 14px;
  left: 14px;
  font-size: 9px;
  color: #b0b4d0;
}
.album-side strong {
  display: block;
  font-size: 15px;
  margin-bottom: 4px;
}
.album-side small {
  font-size: 10px;
  color: #9ea0b4;
}
.play-line {
  height: 3px;
  background: rgba(255, 255, 255, 0.15);
  margin-top: 14px;
  max-width: 170px;
  border-radius: 2px;
  overflow: hidden;
}
.play-line i {
  display: block;
  width: 45%;
  height: 100%;
  background: var(--lime);
}
.illustrated-controls {
  font-size: 14px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 140px;
  margin-top: 10px;
  color: #dcdee9;
}
.illustrated-controls .play-btn {
  font-weight: 900;
  font-size: 20px;
  color: var(--lime);
  cursor: pointer;
}

/* 动态流淌歌词 */
.lyrics-stream {
  font-size: clamp(15px, 1.6vw, 22px);
  font-weight: 800;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.28);
  white-space: nowrap;
}
.lyrics-stream p {
  margin-bottom: 18px;
  transition: all 0.3s ease;
}
.lyrics-stream p.current-line {
  color: #ffffff;
  font-size: 1.2em;
  transform: scale(1.04) translateX(8px);
  text-shadow: 0 0 18px rgba(199, 255, 62, 0.4);
}
.lyrics-stream p.current-line::before {
  content: "♪ ";
  color: var(--lime);
}

/* 模式 2: 桌面歌词 */
.desktop-panel {
  background: linear-gradient(140deg, #5c675c, #7a8a7c 45%, #3d564e);
}
.desktop-clock {
  position: absolute;
  right: 28px;
  top: 36px;
  font-size: 52px;
  font-weight: 300;
  letter-spacing: -2px;
  color: rgba(255, 255, 255, 0.75);
  line-height: 1;
}
.desktop-clock small {
  display: block;
  font-size: 10px;
  letter-spacing: 0;
  text-align: right;
  margin-top: 6px;
}
.desktop-window {
  position: absolute;
  left: 8%;
  top: 16%;
  width: 46%;
  height: 60%;
  background: #f4f4f1;
  box-shadow: 0 24px 50px rgba(0, 0, 0, 0.4);
  border-radius: 10px;
  padding: 18px;
  color: #111218;
}
.desktop-window p {
  font-size: 8px;
  letter-spacing: 1px;
  margin-top: 18px;
  color: #777;
  font-weight: 700;
}
.desktop-window > div {
  font-size: 14px;
  line-height: 2.1;
  font-weight: 700;
}
.desktop-lyrics {
  position: absolute;
  bottom: 24px;
  left: 6%;
  right: 6%;
  text-align: center;
  padding: 14px 12px;
  background: rgba(17, 18, 24, 0.85);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 10px;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.35);
}
.desktop-lyrics small {
  font-size: 9px;
  color: #aaa;
  display: block;
}
.desktop-lyrics p {
  margin: 6px 0 0;
  font-size: clamp(16px, 1.8vw, 24px);
  font-weight: 800;
  color: var(--lime);
}

/* 模式 3: 悬浮双岛底栏 (Android 4.9.0 实机同款) */
.mini-panel {
  background: #1e2030;
  display: flex;
  justify-content: center;
  align-items: center;
  flex-direction: column;
  position: relative;
}
.mini-backdrop {
  position: absolute;
  left: 28px;
  top: 28px;
  font-size: clamp(38px, 4.8vw, 68px);
  line-height: 0.98;
  font-weight: 900;
  color: rgba(255, 255, 255, 0.07);
  letter-spacing: -2px;
  pointer-events: none;
}
.dual-pill-showcase {
  display: flex;
  align-items: center;
  gap: 16px;
  width: 88%;
  max-width: 620px;
  z-index: 2;
}

/* 左岛：导航胶囊 */
.pill-nav-demo {
  flex: 1.1;
  height: 60px;
  background: rgba(36, 38, 52, 0.85);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 9999px;
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding: 0 12px;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.35);
}
.pill-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  font-size: 10px;
  color: #8f91a2;
}
.pill-item.active {
  color: var(--lime);
}

/* 右岛：播放微控胶囊 */
.pill-player-demo {
  flex: 1.4;
  height: 60px;
  background: rgba(36, 38, 52, 0.85);
  backdrop-filter: blur(16px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 9999px;
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 18px 0 10px;
  box-shadow: 0 16px 36px rgba(0, 0, 0, 0.35);
}
.pill-art {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--lime);
  flex-shrink: 0;
  animation: spinVinyl 16s linear infinite;
}
.pill-meta strong {
  display: block;
  font-size: 13px;
  font-weight: 800;
  color: #fff;
  white-space: nowrap;
}
.pill-meta small {
  display: block;
  font-size: 9px;
  color: #9294a6;
}
.pill-bars {
  display: flex;
  align-items: flex-end;
  gap: 3px;
  height: 18px;
  margin-left: auto;
}
.pill-bars i {
  width: 3px;
  height: 6px;
  background: var(--lime);
  animation: equalize 1s ease infinite alternate;
}
.pill-bars i:nth-child(2) { height: 16px; animation-delay: -0.4s; }
.pill-bars i:nth-child(3) { height: 10px; animation-delay: -0.2s; }
.pill-play-btn {
  font-size: 16px;
  font-weight: 900;
  color: #fff;
  margin-left: 8px;
  cursor: pointer;
}

.mini-footnote {
  font-size: 11px;
  color: #9799aa;
  position: absolute;
  bottom: 22px;
  text-align: center;
}

/* ================= 03. FEATURES 声学与设计特质 ================= */
.features {
  border-bottom: 1px solid var(--line);
}
.feature-list {
  display: flex;
  flex-direction: column;
}
.feature-item {
  display: grid;
  grid-template-columns: 60px 1fr 1.25fr 40px;
  gap: 24px;
  align-items: center;
  padding: 32px 0;
  border-top: 1px solid var(--line);
  transition: background-color 0.2s ease, transform 0.2s ease;
}
.feature-item:hover {
  transform: translateX(6px);
}
.feature-item:last-child {
  border-bottom: 1px solid var(--line);
}
.feature-number {
  font-size: 11px;
  color: var(--muted);
  font-weight: 800;
}
.feature-title h3 {
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 6px;
}
.feature-title span {
  font-size: 9px;
  letter-spacing: 1.2px;
  color: var(--muted);
  font-weight: 700;
}
.feature-copy p {
  font-size: 13px;
  line-height: 1.85;
  color: var(--muted);
  margin-bottom: 12px;
  max-width: 520px;
}
.tags {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.tags span {
  border: 1px solid var(--line);
  padding: 4px 10px;
  font-size: 10px;
  color: var(--muted);
  border-radius: 4px;
  background: var(--line-light);
}
.feature-arrow {
  justify-self: end;
  color: var(--accent);
  font-size: 28px;
  font-weight: 300;
  transition: transform 0.2s ease;
}
.feature-item:hover .feature-arrow {
  transform: translate(3px, -3px);
  color: var(--sky);
}

/* ================= 04. DOWNLOAD 多端下载中心 ================= */
.download {
  background: #0f1015;
  color: #fff;
  border-radius: 20px;
  margin-top: 40px;
  margin-bottom: 40px;
  padding-top: 80px;
  padding-bottom: 50px;
  box-shadow: var(--shadow-lg);
}
.download .eyebrow {
  color: #9d9ea7;
}
.download .eyebrow-line {
  background: var(--lime);
}
.download-head {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.download h2 {
  font-size: clamp(44px, 6.5vw, 92px);
  line-height: 1.1;
  letter-spacing: -0.04em;
  font-weight: 900;
  margin-bottom: 0;
}
.download h2 em {
  color: var(--lime);
  font-style: normal;
}
.download-mark {
  font-size: clamp(80px, 12vw, 150px);
  color: var(--lime);
  line-height: 1;
  font-weight: 200;
  opacity: 0.9;
}
.smart-route-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 6px;
  width: 100%;
  margin-top: 8px;
}
.smart-route-button {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  min-width: 0;
  padding: 7px 9px;
  border: 1px solid rgba(0, 0, 0, 0.12);
  border-radius: 7px;
  background: rgba(255, 255, 255, 0.42);
  color: #34353d;
  font-size: 10px;
  line-height: 1.2;
  transition: border-color 0.2s ease, transform 0.2s ease;
}
.smart-route-button:hover {
  border-color: var(--lime);
  transform: translateY(-1px);
}
.smart-route-button > span:first-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
[data-theme="dark"] .smart-route-button {
  border-color: rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.08);
  color: #f1f2f6;
}

/* 高速分发通道条 (Channel Bar) */
.channel-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  margin-top: 36px;
  padding: 16px 20px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 10px;
}
.channel-title {
  font-size: 12px;
  font-weight: 800;
  color: #a4a6b5;
  margin-right: 6px;
}
.channel-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 700;
  color: #fff;
  padding: 6px 14px;
  border-radius: 6px;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.12);
  transition: all 0.2s ease;
}
.channel-link i {
  font-style: normal;
}
.channel-link:hover {
  background: rgba(199, 255, 62, 0.15);
  border-color: var(--lime);
  color: var(--lime);
  transform: translateY(-1px);
}

.download-options {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin-top: 36px;
  border-top: 1px solid #363740;
}
.platform-card {
  padding: 36px 0;
  border-bottom: 1px solid #363740;
  transition: transform 0.2s ease, background-color 0.2s ease;
}
.platform-card:nth-child(odd) {
  padding-right: 4vw;
}
.platform-card:nth-child(even) {
  border-left: 1px solid #363740;
  padding-left: 4vw;
}
.platform-card.highlight {
  position: relative;
}
.platform-card.highlight::before {
  content: "推荐平台";
  position: absolute;
  top: 12px;
  right: 12px;
  background: var(--lime);
  color: #111218;
  font-size: 9px;
  font-weight: 800;
  padding: 2px 8px;
  border-radius: 3px;
}

.platform-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.chip-label {
  font-size: 9px;
  letter-spacing: 1.4px;
  color: #8c8e9b;
  font-weight: 700;
}
.availability {
  font-size: 10px;
  color: #8c8e9b;
  border: 1px solid #444550;
  padding: 4px 10px;
  border-radius: 4px;
}
.availability.available {
  color: var(--lime);
  border-color: rgba(199, 255, 62, 0.4);
  background: rgba(199, 255, 62, 0.08);
}
.availability.ready {
  color: #38bdf8;
  border-color: rgba(56, 189, 248, 0.4);
  background: rgba(56, 189, 248, 0.08);
}
.availability.planning {
  color: #f59e0b;
  border-color: rgba(245, 158, 11, 0.4);
  background: rgba(245, 158, 11, 0.08);
}

.platform-card h3 {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 26px;
  letter-spacing: -0.02em;
  margin: 18px 0 10px;
  font-weight: 800;
}
.platform-card h3 svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  color: var(--lime);
  flex-shrink: 0;
}
.platform-card p {
  color: #a4a5b2;
  font-size: 13px;
  margin-bottom: 22px;
  line-height: 1.7;
}
.platform-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}
.download-route-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  width: 100%;
}
.download-route-button {
  min-width: 0;
  justify-content: space-between;
  gap: 12px !important;
}
.download-route-button .route-main {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  min-width: 0;
}
.download-route-button .route-main span:first-child {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.route-status {
  flex-shrink: 0;
  font-size: 10px;
  color: #b3b5c0;
  white-space: nowrap;
}
.route-status.is-online { color: #a9df55; }
.route-status.is-offline { color: #ff8f8f; }
.route-status.is-restricted { color: #f4c96b; }
.platform-actions .button {
  min-height: 46px;
  padding: 0 18px;
  gap: 14px;
  font-size: 12px;
}
.download .button-outline {
  border: 1px solid rgba(255, 255, 255, 0.28);
  color: #f1f2f6;
  background: rgba(255, 255, 255, 0.05);
}
.download .button-outline:hover {
  background: rgba(255, 255, 255, 0.16);
  border-color: #ffffff;
  color: #ffffff;
}

.platform-card small {
  display: block;
  margin: 16px 0 0;
  font-size: 10px;
  color: #878896;
  line-height: 1.8;
}
.install-help {
  color: var(--lime);
  margin-left: 8px;
  border-bottom: 1px solid rgba(199, 255, 62, 0.6);
  white-space: nowrap;
}

.download-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 20px;
  font-size: 11px;
  padding-top: 24px;
  color: #9293a0;
}
.download-foot > a {
  color: #d3d4dc;
  font-weight: 700;
}
.download-foot > a span {
  color: var(--lime);
  margin-left: 6px;
}

/* ================= 05. FAQ 常见问题 ================= */
.faq {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 6vw;
  padding-top: 70px;
  padding-bottom: 70px;
  border-bottom: 1px solid var(--line);
}
.faq h2 {
  font-size: clamp(32px, 3.5vw, 48px);
  line-height: 1.2;
  letter-spacing: -0.03em;
  font-weight: 900;
}
.faq-list {
  display: flex;
  flex-direction: column;
}
.faq details {
  border-top: 1px solid var(--line);
  scroll-margin-top: 110px;
}
.faq details:last-child {
  border-bottom: 1px solid var(--line);
}
.faq summary {
  list-style: none;
  cursor: pointer;
  font-size: 15px;
  font-weight: 700;
  padding: 24px 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 15px;
}
.faq summary::-webkit-details-marker {
  display: none;
}
.faq summary span {
  font-size: 22px;
  color: var(--accent);
  font-weight: 300;
  transition: transform 0.25s ease;
}
.faq details[open] summary span {
  transform: rotate(45deg);
}
.faq details p {
  font-size: 13px;
  line-height: 1.95;
  color: var(--muted);
  padding-right: 25px;
  margin-bottom: 22px;
}

/* ================= FOOTER 优雅页脚 ================= */
.site-footer {
  padding: 60px 4.5vw 36px;
  max-width: 1360px;
  margin: 0 auto;
}
.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-bottom: 30px;
}
.footer-brand {
  font-size: 36px;
  font-weight: 900;
  letter-spacing: -0.03em;
}
.footer-brand span {
  font-size: 10px;
  letter-spacing: 2px;
  margin-left: 12px;
  color: var(--muted);
}
.footer-quote {
  font-size: 13px;
  color: var(--muted);
}
.back-to-top {
  font-size: 12px;
  font-weight: 700;
  color: var(--ink);
}
.back-to-top:hover {
  color: var(--accent);
}
.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-top: 1px solid var(--line);
  padding-top: 24px;
  font-size: 11px;
  letter-spacing: 0.8px;
  color: var(--muted);
}
.footer-tagline {
  font-weight: 800;
  letter-spacing: 1.5px;
  color: var(--ink);
}
.footer-dl-link {
  font-weight: 800;
  color: var(--accent);
}

/* ================= 响应式媒体查询 ================= */
@media (max-width: 1050px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 40px;
    padding-top: 110px;
  }
  .hero-visual {
    height: 480px;
  }
  .manifesto {
    grid-template-columns: 100px 1.25fr 1fr;
  }
  .section-heading {
    grid-template-columns: 1fr;
    gap: 16px;
  }
  .section-heading > p {
    justify-self: start;
  }
  .experience-layout {
    grid-template-columns: 1fr;
  }
  .feature-item {
    grid-template-columns: 40px 1fr 1.2fr 30px;
    gap: 16px;
  }
}

@media (max-width: 760px) {
  .site-header {
    height: 72px;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    gap: 0;
    padding: 16px 24px;
    background: var(--paper);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-md);
  }
  .nav-links.open {
    display: flex;
  }
  .nav-links a {
    padding: 14px 0;
    font-size: 15px;
  }
  .menu-button {
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 6px;
    width: 36px;
    height: 36px;
  }
  .menu-button span {
    display: block;
    height: 2px;
    width: 22px;
    background: var(--ink);
    transition: transform 0.2s;
  }
  .menu-button[aria-expanded="true"] span:first-child {
    transform: translateY(4px) rotate(45deg);
  }
  .menu-button[aria-expanded="true"] span:last-child {
    transform: translateY(-4px) rotate(-45deg);
  }
  .header-cta {
    display: none;
  }

  .hero {
    padding: 96px 5vw 24px;
  }
  .hero h1 {
    font-size: clamp(40px, 11vw, 68px);
  }
  .hero-visual {
    height: 380px;
  }
  .record-sleeve {
    width: 65%;
    padding: 18px;
  }
  .record-sleeve > span {
    font-size: 18px;
  }
  .record-sleeve b {
    font-size: 38px;
  }
  .vinyl {
    width: 72%;
  }
  .floating-player {
    min-height: 64px;
    padding: 10px 14px;
  }

  .manifesto {
    grid-template-columns: 1fr;
    gap: 20px;
  }
  .feature-item {
    grid-template-columns: 1fr;
    gap: 14px;
  }
  .feature-number {
    display: none;
  }
  .feature-arrow {
    display: none;
  }

  .mode-panel {
    height: 340px;
  }
  .immersive-body {
    grid-template-columns: 1fr;
    gap: 20px;
    padding: 20px;
  }
  .album-art {
    display: none;
  }
  .dual-pill-showcase {
    flex-direction: column;
    gap: 12px;
  }
  .pill-nav-demo, .pill-player-demo {
    width: 100%;
  }

  .channel-bar {
    padding: 12px 16px;
    gap: 8px;
  }
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    width: 100%;
  }
  .hero-actions > .button,
  .hero-actions > .smart-route-list,
  .hero-actions > .text-link {
    width: 100%;
  }
  .hero-actions > .text-link {
    justify-content: center;
  }
  .smart-route-list {
    grid-template-columns: 1fr;
  }
  .smart-route-button {
    min-height: 44px;
    padding: 10px 12px;
    font-size: 12px;
  }
  .channel-link {
    font-size: 11px;
    padding: 5px 10px;
  }

  .download-route-list {
    grid-template-columns: 1fr;
  }

  .download-options {
    grid-template-columns: 1fr;
  }
  .platform-card:nth-child(even) {
    border-left: 0;
    padding-left: 0;
  }
  .platform-card:nth-child(odd) {
    padding-right: 0;
  }

  .faq {
    grid-template-columns: 1fr;
    gap: 24px;
  }
  .footer-top {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
  }
}