/* ===================================================================
   SSONE (ssone.shop) - STYLE 53: VINYL MUSIC STUDIO
   Design Language: Vinyl Records / Analog Music / Album Cover / Record Store / Studio Culture
   Visual Personality: 复古、潮流、艺术、节奏感。页面本身即是一张可播放的黑胶专辑。
   =================================================================== */

:root {
  /* 调色系统 (Color System) */
  --c-cream: #fbf8f1;
  --c-cream-soft: #f4ede1;
  --c-cream-dark: #e8ded0;
  --c-jet-black: #121214;
  --c-vinyl-black: #1a1a1e;
  --c-studio-dark: #0a0a0c;
  
  /* 经典唱片强调色 (Bold Album Accents) */
  --c-burnt-orange: #c85a17;
  --c-burnt-orange-hover: #b04c10;
  --c-cherry-red: #c92a2a;
  --c-cherry-red-hover: #a61e1e;
  --c-cobalt-blue: #1d4ed8;
  --c-cobalt-blue-deep: #1e3a8a;
  --c-mustard-yellow: #d97706;
  --c-mustard-bright: #eab308;

  /* 文字排印系统 */
  --text-main: #121214;
  --text-cream: #fbf8f1;
  --text-muted: #57534e;
  --text-cream-muted: #a8a29e;

  /* 黑胶封套边框与阴影 */
  --border-vinyl: 2px solid #121214;
  --border-cream: 2px solid rgba(251, 248, 241, 0.25);
  --shadow-album: 6px 6px 0px #121214;
  --shadow-album-lg: 10px 10px 0px #121214;
  --shadow-album-cream: 6px 6px 0px rgba(251, 248, 241, 0.4);

  /* 字体栈 (零外链字体，兼顾模拟黑胶印刷字体) */
  --font-stack: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Menlo", "Consolas", monospace;

  --container-max: 1180px;
  --article-max: 840px;
  --transition-smooth: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
}

/* 基础重置与黑胶纸张纹理 */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-stack);
  background-color: var(--c-cream);
  color: var(--text-main);
  line-height: 1.68;
  letter-spacing: 0.01em;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
  background-image: radial-gradient(rgba(18, 18, 20, 0.05) 1px, transparent 0);
  background-size: 24px 24px;
}

a {
  color: inherit;
  text-decoration: none;
  transition: all var(--transition-smooth);
}

img, svg {
  display: block;
  max-width: 100%;
}

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: transparent;
}

/* 容器规范 */
.site-container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

.article-container {
  width: 100%;
  max-width: var(--article-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.5rem;
  padding-right: 1.5rem;
}

/* 顶部唱片店工坊导航 (STUDIO HEADER) */
.site-header {
  background-color: var(--c-cream);
  border-bottom: 2px solid var(--c-jet-black);
  position: sticky;
  top: 0;
  z-index: 200;
  box-shadow: 0 4px 0 rgba(18, 18, 20, 0.08);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 74px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-size: 1.35rem;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--c-jet-black);
  text-transform: uppercase;
}

.brand-vinyl-badge,
.brand-logo-mark {
  width: 38px;
  height: 38px;
  background-color: var(--c-jet-black);
  color: var(--c-cream);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 3px solid var(--c-cream);
  box-shadow: 0 0 0 2px var(--c-jet-black);
  font-size: 1rem;
  font-weight: 900;
  position: relative;
}

.brand-vinyl-badge::after,
.brand-logo-mark::after {
  content: "";
  width: 8px;
  height: 8px;
  background-color: var(--c-burnt-orange);
  border-radius: 50%;
  position: absolute;
}

.brand-catalog-id {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--c-burnt-orange);
  border: 1px solid var(--c-burnt-orange);
  padding: 0.1rem 0.4rem;
  border-radius: 3px;
  letter-spacing: 0.05em;
  margin-left: 0.35rem;
}

/* 导航：音轨列表 TRACK 01 - 05 */
.track-nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.track-link {
  font-family: var(--font-mono);
  font-size: 0.88rem;
  font-weight: 700;
  color: var(--c-jet-black);
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.4rem 0.6rem;
  border: 1px solid transparent;
  border-radius: 4px;
  transition: all var(--transition-smooth);
}

.track-link:hover, .track-link.is-active {
  background-color: var(--c-jet-black);
  color: var(--c-cream);
  border-color: var(--c-jet-black);
}

/* 小型音频均衡器 (MINI EQUALIZER) */
.mini-eq {
  display: inline-flex;
  align-items: flex-end;
  gap: 2px;
  width: 14px;
  height: 12px;
}

.mini-eq-bar {
  width: 2px;
  background-color: var(--c-burnt-orange);
  border-radius: 1px;
  animation: eqBounce 1s ease-in-out infinite alternate;
}

.track-link.is-active .mini-eq-bar {
  background-color: var(--c-mustard-bright);
}

.mini-eq-bar:nth-child(1) { height: 40%; animation-delay: 0.1s; }
.mini-eq-bar:nth-child(2) { height: 100%; animation-delay: 0.3s; }
.mini-eq-bar:nth-child(3) { height: 60%; animation-delay: 0.2s; }

@keyframes eqBounce {
  0% { height: 25%; }
  50% { height: 100%; }
  100% { height: 45%; }
}

.nav-cta-vinyl {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--c-burnt-orange);
  color: var(--c-cream);
  font-weight: 800;
  font-size: 0.92rem;
  padding: 0.55rem 1.25rem;
  border: 2px solid var(--c-jet-black);
  box-shadow: 3px 3px 0px var(--c-jet-black);
  border-radius: 4px;
  transition: all var(--transition-smooth);
}

.nav-cta-vinyl:hover {
  background-color: var(--c-burnt-orange-hover);
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0px var(--c-jet-black);
  color: var(--c-cream);
}

.nav-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: var(--c-burnt-orange);
  color: var(--c-cream);
  font-weight: 800;
  font-size: 0.92rem;
  padding: 0.55rem 1.25rem;
  border: 2px solid var(--c-jet-black);
  box-shadow: 3px 3px 0px var(--c-jet-black);
  border-radius: 4px;
  transition: all var(--transition-smooth);
}

.nav-cta-btn:hover {
  background-color: var(--c-burnt-orange-hover);
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0px var(--c-jet-black);
  color: var(--c-cream);
}

.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: var(--c-burnt-orange);
  color: #ffffff;
  font-size: 1.05rem;
  font-weight: 800;
  padding: 0.9rem 2rem;
  border: 2px solid var(--c-jet-black);
  box-shadow: var(--shadow-album);
  border-radius: 4px;
  transition: all var(--transition-smooth);
}

.btn-primary:hover {
  background-color: var(--c-burnt-orange-hover);
  color: #ffffff;
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-album-lg);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background-color: transparent;
  color: var(--c-jet-black);
  font-size: 1.05rem;
  font-weight: 800;
  padding: 0.9rem 2rem;
  border: 2px solid var(--c-jet-black);
  border-radius: 4px;
  transition: all var(--transition-smooth);
}

.btn-secondary:hover {
  background-color: var(--c-cream-soft);
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0px var(--c-jet-black);
}

.mobile-nav-cta {
  background-color: var(--c-burnt-orange);
  color: #ffffff;
  font-weight: 800;
  padding: 0.75rem 1rem;
  border: 2px solid var(--c-jet-black);
  border-radius: 4px;
  box-shadow: 3px 3px 0px var(--c-jet-black);
  text-align: center;
}

.mobile-menu-btn {
  display: none;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--c-jet-black);
  background-color: var(--c-cream);
  box-shadow: 2px 2px 0px var(--c-jet-black);
}

.mobile-nav-panel {
  display: none;
  background-color: var(--c-cream-soft);
  border-bottom: 2px solid var(--c-jet-black);
  padding: 1.25rem 1.5rem 1.75rem;
  flex-direction: column;
  gap: 0.85rem;
}

.mobile-nav-panel.is-open {
  display: flex;
}

/* ===================================================================
   HERO SECTION: 巨大圆形 VINYL DISC 与唱片中心 LABEL
   =================================================================== */
.hero-vinyl-section {
  background-color: var(--c-cream);
  border-bottom: 2px solid var(--c-jet-black);
  padding: 4.5rem 0 5rem;
  position: relative;
  overflow: hidden;
}

.hero-studio-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 3.5rem;
  align-items: center;
}

/* 左侧唱片文案排版 */
.hero-editorial {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  position: relative;
  z-index: 2;
}

.album-release-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  background-color: var(--c-jet-black);
  color: var(--c-cream);
  padding: 0.35rem 0.85rem;
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  width: fit-content;
  letter-spacing: 0.08em;
}

.album-release-badge .red-rec-dot {
  width: 9px;
  height: 9px;
  background-color: var(--c-cherry-red);
  border-radius: 50%;
  animation: recBlink 1.4s ease-in-out infinite;
}

@keyframes recBlink {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.2; }
}

.hero-press-play {
  font-size: 1.15rem;
  font-weight: 900;
  letter-spacing: 0.25em;
  color: var(--c-burnt-orange);
  text-transform: uppercase;
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.hero-main-title {
  font-size: 3.25rem;
  font-weight: 900;
  line-height: 1.18;
  color: var(--c-jet-black);
  letter-spacing: -0.03em;
  text-shadow: 2px 2px 0px rgba(251, 248, 241, 0.8);
}

.hero-liner-notes {
  font-size: 1.15rem;
  color: var(--text-muted);
  line-height: 1.7;
  max-width: 580px;
  border-left: 4px solid var(--c-burnt-orange);
  padding-left: 1.25rem;
  background-color: rgba(244, 237, 225, 0.5);
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
}

/* 唱片播放 CTA 按键规范 */
.hero-vinyl-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  margin-top: 0.75rem;
  flex-wrap: wrap;
}

.btn-vinyl-play {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.85rem;
  background-color: var(--c-jet-black);
  color: var(--c-cream);
  font-size: 1.05rem;
  font-weight: 800;
  padding: 0.95rem 2.2rem;
  border: 2px solid var(--c-jet-black);
  border-radius: 4px;
  box-shadow: var(--shadow-album);
  transition: all var(--transition-smooth);
  overflow: hidden;
  text-transform: uppercase;
}

.btn-vinyl-play .play-icon {
  width: 20px;
  height: 20px;
  fill: currentColor;
  transition: transform 0.4s ease;
}

.btn-vinyl-play:hover {
  background-color: var(--c-burnt-orange);
  color: var(--c-cream);
  transform: translate(-2px, -2px);
  box-shadow: var(--shadow-album-lg);
}

.btn-vinyl-play:hover .play-icon {
  transform: rotate(360deg);
}

/* CTA 点击与背景波形动态 */
.btn-wave-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  opacity: 0;
  background: repeating-linear-gradient(
    90deg,
    transparent,
    transparent 4px,
    rgba(255, 255, 255, 0.12) 4px,
    rgba(255, 255, 255, 0.12) 8px
  );
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.btn-vinyl-play:hover .btn-wave-bg {
  opacity: 1;
}

.btn-vinyl-secondary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  background-color: transparent;
  color: var(--c-jet-black);
  font-size: 1rem;
  font-weight: 800;
  padding: 0.95rem 1.8rem;
  border: 2px solid var(--c-jet-black);
  border-radius: 4px;
  transition: all var(--transition-smooth);
}

.btn-vinyl-secondary:hover {
  background-color: var(--c-cream-soft);
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0px var(--c-jet-black);
}

/* 右侧巨大圆形 VINYL DISC */
.vinyl-disc-stage {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
}

.vinyl-disc-sleeve {
  width: 360px;
  height: 360px;
  background: #18181b;
  border: 3px solid var(--c-jet-black);
  border-radius: 8px;
  box-shadow: var(--shadow-album-lg);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  background-image: 
    linear-gradient(135deg, rgba(200, 90, 23, 0.18) 0%, transparent 60%),
    linear-gradient(225deg, rgba(29, 78, 216, 0.18) 0%, transparent 60%);
}

.sleeve-spine-label {
  position: absolute;
  top: 14px;
  left: 14px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--c-mustard-bright);
  letter-spacing: 0.12em;
}

/* 真实黑胶唱片盘体 */
.vinyl-record {
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: 
    repeating-radial-gradient(
      circle at center,
      #141416 0px,
      #141416 2px,
      #1e1e24 3px,
      #101012 4px,
      #1e1e24 5px
    );
  box-shadow: 
    inset 0 0 20px rgba(0, 0, 0, 0.95),
    0 12px 30px rgba(0, 0, 0, 0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  transition: transform 0.6s ease;
  animation: vinylSpin 14s linear infinite;
  border: 1px solid #2d2d34;
}

.vinyl-record.is-playing-fast {
  animation-duration: 3.5s;
}

/* 黑胶高光反光双扇面 */
.vinyl-record::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  border-radius: 50%;
  background: linear-gradient(
    115deg,
    transparent 35%,
    rgba(255, 255, 255, 0.08) 48%,
    rgba(255, 255, 255, 0.16) 50%,
    rgba(255, 255, 255, 0.08) 52%,
    transparent 65%
  );
  pointer-events: none;
}

@keyframes vinylSpin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* 唱片中心圆形 LABEL (产品居于中心) */
.vinyl-center-label {
  width: 120px;
  height: 120px;
  background-color: var(--c-burnt-orange);
  border-radius: 50%;
  border: 4px solid var(--c-jet-black);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  box-shadow: 0 0 10px rgba(0,0,0,0.5);
  position: relative;
  color: var(--c-cream);
  padding: 0.5rem;
}

.label-stereo {
  font-family: var(--font-mono);
  font-size: 0.58rem;
  letter-spacing: 0.1em;
  font-weight: 700;
  color: var(--c-mustard-bright);
}

.label-brand-name {
  font-size: 1.15rem;
  font-weight: 900;
  line-height: 1.1;
  color: #ffffff;
  letter-spacing: 0.05em;
  margin: 0.15rem 0;
}

.label-speed {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  font-weight: 600;
  color: var(--c-cream-soft);
}

.vinyl-center-spindle {
  width: 14px;
  height: 14px;
  background-color: var(--c-cream);
  border-radius: 50%;
  border: 2px solid var(--c-jet-black);
  margin-top: 0.25rem;
}

/* 唱臂 (TONE ARM) 装饰 */
.vinyl-tone-arm {
  position: absolute;
  top: -20px;
  right: -10px;
  width: 110px;
  height: 170px;
  pointer-events: none;
  z-index: 10;
  transform-origin: 85px 25px;
  transform: rotate(-10deg);
  transition: transform 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
}

.vinyl-disc-stage:hover .vinyl-tone-arm {
  transform: rotate(14deg);
}

/* ===================================================================
   SECTION COLOR RULE: 每一个 SECTION 像不同 ALBUM COVER (BOLD SHIFTS)
   =================================================================== */

/* SECTION 1: TRACK 01 → DISCOVERY (线路优势 - Cobalt Blue & Cream) */
.section-track-01 {
  background-color: var(--c-cobalt-blue-deep);
  color: var(--c-cream);
  border-bottom: 2px solid var(--c-jet-black);
  padding: 5rem 0;
  position: relative;
}

.section-track-01 .section-eyebrow {
  color: var(--c-mustard-bright);
}

.section-track-01 .section-title {
  color: #ffffff;
}

.section-track-01 .section-subtitle {
  color: var(--c-cream-dark);
}

/* SECTION 2: TRACK 02 → FEATURES (核心音轨 - Jet Black & Mustard Yellow) */
.section-track-02 {
  background-color: var(--c-jet-black);
  color: var(--c-cream);
  border-bottom: 2px solid var(--c-jet-black);
  padding: 5.5rem 0;
}

.section-track-02 .section-eyebrow {
  color: var(--c-burnt-orange);
}

.section-track-02 .section-title {
  color: var(--c-cream);
}

.section-track-02 .section-subtitle {
  color: var(--text-cream-muted);
}

/* SECTION 3: TRACK 03 → PROOF (场景录音与支持生态 - Cherry Red & Cream) */
.section-track-03 {
  background-color: #8b1e1e;
  color: var(--c-cream);
  border-bottom: 2px solid var(--c-jet-black);
  padding: 5.5rem 0;
}

.section-track-03 .section-eyebrow {
  color: var(--c-mustard-bright);
}

.section-track-03 .section-title {
  color: #ffffff;
}

.section-track-03 .section-subtitle {
  color: var(--c-cream-soft);
}

/* SECTION 4: TRACK 04 → PRICING PEAK (订阅版本 - Cream & Burnt Orange) */
.section-track-04 {
  background-color: var(--c-cream);
  color: var(--c-jet-black);
  border-bottom: 2px solid var(--c-jet-black);
  padding: 5.5rem 0;
}

.section-track-04 .section-eyebrow {
  color: var(--c-burnt-orange);
}

.section-track-04 .section-title {
  color: var(--c-jet-black);
}

/* SECTION 5: TRACK 05 → FINAL CHORUS (常见问答与终曲 CTA - Studio Vinyl Black) */
.section-track-05 {
  background-color: var(--c-studio-dark);
  color: var(--c-cream);
  border-bottom: 2px solid var(--c-jet-black);
  padding: 5.5rem 0;
}

/* 通用 Section 头部排版 */
.section-head-album {
  max-width: 740px;
  margin: 0 auto 3.5rem;
  text-align: center;
}

.section-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  font-weight: 800;
  letter-spacing: 0.15em;
  margin-bottom: 0.65rem;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-transform: uppercase;
}

.section-title {
  font-size: 2.35rem;
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.1rem;
  line-height: 1.65;
}

/* ===================================================================
   CARDS: 全部设计成 ALBUM COVER 风格
   =================================================================== */

/* 优势对比卡片 (TRACK 01 - Benefits) */
.benefits-album-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2rem;
}

.album-cover-card {
  background-color: var(--c-cream);
  color: var(--c-jet-black);
  border: 2px solid var(--c-jet-black);
  box-shadow: var(--shadow-album);
  border-radius: 6px;
  padding: 2.25rem;
  position: relative;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

.album-cover-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-album-lg);
}

.album-cover-card.positive {
  background-color: #ffffff;
  border: 3px solid var(--c-burnt-orange);
}

.album-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--c-jet-black);
  padding-bottom: 0.85rem;
}

.album-track-no {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 800;
  background-color: var(--c-jet-black);
  color: var(--c-cream);
  padding: 0.2rem 0.55rem;
  border-radius: 2px;
}

.album-track-heading {
  font-size: 1.3rem;
  font-weight: 800;
}

.album-bullet-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.album-bullet-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  font-size: 1rem;
  line-height: 1.55;
}

.bullet-vinyl-icon {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
  margin-top: 2px;
}

/* 特性卡 (TRACK 02 - Feature = Track) */
.features-track-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
}

.track-feature-card {
  background-color: var(--c-vinyl-black);
  border: 2px solid #2d2d34;
  border-radius: 6px;
  padding: 2rem;
  box-shadow: 4px 4px 0px rgba(0, 0, 0, 0.5);
  position: relative;
  transition: all var(--transition-smooth);
  overflow: hidden;
}

.track-feature-card:hover {
  border-color: var(--c-mustard-bright);
  transform: translateY(-3px);
  box-shadow: 6px 6px 0px var(--c-mustard-bright);
}

.track-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.track-index-badge {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--c-burnt-orange);
  letter-spacing: 0.1em;
}

.track-rpm-tag {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-cream-muted);
  border: 1px dashed var(--text-cream-muted);
  padding: 0.1rem 0.4rem;
}

.track-feature-title {
  font-size: 1.35rem;
  font-weight: 800;
  color: var(--c-cream);
  margin-bottom: 0.75rem;
}

.track-feature-desc {
  font-size: 0.98rem;
  color: var(--text-cream-muted);
  line-height: 1.68;
}

/* 应用生态卡 (Product = Album) */
.ecosystem-album-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.25rem;
  margin-top: 2rem;
}

.album-mini-card {
  background-color: #242428;
  border: 2px solid #383842;
  border-radius: 6px;
  padding: 1.5rem 1.25rem;
  text-align: center;
  transition: all var(--transition-smooth);
}

.album-mini-card:hover {
  border-color: var(--c-burnt-orange);
  background-color: #2a2a30;
}

.album-mini-name {
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--c-cream);
  margin-bottom: 0.35rem;
}

.album-mini-genre {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--c-mustard-bright);
  background-color: rgba(234, 179, 8, 0.15);
  padding: 0.15rem 0.5rem;
  border-radius: 2px;
  margin-bottom: 0.65rem;
  font-weight: 700;
}

.album-mini-desc {
  font-size: 0.86rem;
  color: var(--text-cream-muted);
  line-height: 1.5;
}

/* ===================================================================
   SCENARIOS: 做成 VINYL SLEEVE (黑胶唱片封套包装)
   =================================================================== */
.sleeve-scenarios-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.75rem;
}

.vinyl-sleeve-card {
  background-color: var(--c-cream);
  color: var(--c-jet-black);
  border: 3px solid var(--c-jet-black);
  box-shadow: var(--shadow-album);
  border-radius: 6px;
  padding: 1.75rem;
  position: relative;
  transition: all var(--transition-smooth);
  display: flex;
  flex-direction: column;
}

.vinyl-sleeve-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-album-lg);
}

/* 封套露出的黑胶唱片边缘微露效果 */
.vinyl-sleeve-card::after {
  content: "";
  position: absolute;
  top: 15px;
  right: -12px;
  width: 24px;
  height: calc(100% - 30px);
  background: repeating-radial-gradient(
    circle at right,
    #18181b 0px,
    #18181b 2px,
    #27272a 3px,
    #101012 4px
  );
  border-radius: 0 12px 12px 0;
  border: 2px solid var(--c-jet-black);
  border-left: none;
  z-index: -1;
  transition: right 0.3s ease;
}

.vinyl-sleeve-card:hover::after {
  right: -20px;
}

.sleeve-top-spine {
  display: flex;
  align-items: center;
  justify-content: space-between;
  border-bottom: 2px solid var(--c-jet-black);
  padding-bottom: 0.65rem;
  margin-bottom: 1rem;
}

.sleeve-track-title {
  font-size: 1.2rem;
  font-weight: 900;
  color: var(--c-jet-black);
}

.sleeve-gear-tag {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 800;
  background-color: var(--c-burnt-orange);
  color: #ffffff;
  padding: 0.2rem 0.55rem;
  border-radius: 2px;
}

.sleeve-liner-note {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.65;
  flex-grow: 1;
}

/* ===================================================================
   PRICING: SINGLE / EP / FULL ALBUM (Pricing = Edition)
   Recommended: "MOST PLAYED"
   =================================================================== */
.pricing-editions-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  align-items: stretch;
}

.edition-card {
  background-color: #ffffff;
  border: 3px solid var(--c-jet-black);
  box-shadow: var(--shadow-album);
  border-radius: 8px;
  padding: 2.5rem 1.75rem 2rem;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: all var(--transition-smooth);
}

.edition-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-album-lg);
}

.edition-card.most-played {
  border-color: var(--c-burnt-orange);
  box-shadow: 8px 8px 0px var(--c-burnt-orange);
  background-color: #ffffff;
}

.most-played-ribbon {
  position: absolute;
  top: -16px;
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--c-burnt-orange);
  color: #ffffff;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 900;
  padding: 0.3rem 1.25rem;
  border: 2px solid var(--c-jet-black);
  border-radius: 4px;
  letter-spacing: 0.1em;
  white-space: nowrap;
}

.edition-format {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 800;
  color: var(--c-burnt-orange);
  letter-spacing: 0.15em;
  margin-bottom: 0.35rem;
}

.edition-title {
  font-size: 1.45rem;
  font-weight: 900;
  color: var(--c-jet-black);
  margin-bottom: 0.35rem;
}

.edition-target {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
}

.edition-price-block {
  border-top: 2px dashed var(--c-cream-dark);
  border-bottom: 2px dashed var(--c-cream-dark);
  padding: 1.15rem 0;
  margin-bottom: 1.5rem;
}

.edition-price {
  font-size: 2.75rem;
  font-weight: 900;
  color: var(--c-jet-black);
  line-height: 1;
}

.edition-term {
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-muted);
}

.edition-specs-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-bottom: 2.25rem;
  flex-grow: 1;
}

.edition-spec-item {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 0.95rem;
  color: var(--text-main);
  font-weight: 500;
}

.edition-spec-item svg {
  width: 18px;
  height: 18px;
  color: var(--c-burnt-orange);
  flex-shrink: 0;
}

.btn-edition-cta {
  width: 100%;
  text-align: center;
  padding: 0.85rem;
  font-size: 1rem;
  font-weight: 800;
  border: 2px solid var(--c-jet-black);
  border-radius: 4px;
  box-shadow: 3px 3px 0px var(--c-jet-black);
  transition: all var(--transition-smooth);
}

.edition-card.most-played .btn-edition-cta {
  background-color: var(--c-burnt-orange);
  color: #ffffff;
}

.edition-card.most-played .btn-edition-cta:hover {
  background-color: var(--c-burnt-orange-hover);
}

.btn-edition-cta:hover {
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0px var(--c-jet-black);
}

/* ===================================================================
   TRACK 05: FAQ 与 FINAL CHORUS
   =================================================================== */
.vinyl-faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1.15rem;
}

.vinyl-faq-item {
  background-color: var(--c-vinyl-black);
  border: 2px solid #2d2d34;
  border-radius: 6px;
  overflow: hidden;
  transition: all var(--transition-smooth);
}

.vinyl-faq-item.is-open {
  border-color: var(--c-burnt-orange);
}

.vinyl-faq-btn {
  width: 100%;
  text-align: left;
  padding: 1.35rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--c-cream);
  background: transparent;
}

.vinyl-faq-btn svg {
  width: 22px;
  height: 22px;
  color: var(--c-mustard-bright);
  transition: transform var(--transition-smooth);
}

.vinyl-faq-item.is-open .vinyl-faq-btn svg {
  transform: rotate(180deg);
  color: var(--c-burnt-orange);
}

.vinyl-faq-answer {
  display: none;
  padding: 0 1.5rem 1.35rem;
  font-size: 0.98rem;
  color: var(--text-cream-muted);
  line-height: 1.7;
  border-top: 1px dashed #2d2d34;
  padding-top: 1rem;
}

.vinyl-faq-item.is-open .vinyl-faq-answer {
  display: block;
}

/* FINAL CHORUS CTA */
.final-chorus-box {
  margin-top: 5rem;
  background-color: var(--c-jet-black);
  border: 3px solid var(--c-burnt-orange);
  box-shadow: 8px 8px 0px rgba(200, 90, 23, 0.4);
  border-radius: 12px;
  padding: 4rem 2rem;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.final-chorus-title {
  font-size: 2.75rem;
  font-weight: 900;
  color: var(--c-cream);
  margin-bottom: 1rem;
}

.final-chorus-desc {
  font-size: 1.15rem;
  color: var(--text-cream-muted);
  max-width: 600px;
  margin: 0 auto 2.25rem;
  line-height: 1.65;
}

/* ===================================================================
   FOOTER: RECORD STORE / STUDIO BACK COVER
   =================================================================== */
.site-footer {
  background-color: #0d0d0f;
  color: var(--c-cream-soft);
  border-top: 3px solid var(--c-jet-black);
  padding: 4.5rem 0 2rem;
  margin-top: auto;
}

.footer-studio-grid,
.footer-top-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1.2fr;
  gap: 2.5rem;
  padding-bottom: 3.5rem;
  border-bottom: 1px solid #27272a;
}

.footer-col-title {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 800;
  color: var(--c-mustard-bright);
  letter-spacing: 0.12em;
  margin-bottom: 1.25rem;
  text-transform: uppercase;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.footer-link-item a {
  font-size: 0.9rem;
  color: var(--text-cream-muted);
  transition: color var(--transition-smooth);
}

.footer-link-item a:hover {
  color: var(--c-burnt-orange);
}

.footer-bottom-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 2rem;
  font-size: 0.85rem;
  color: #71717a;
  flex-wrap: wrap;
  gap: 1.25rem;
}

.footer-barcode-art {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.barcode-strip {
  display: flex;
  align-items: center;
  height: 28px;
  gap: 2px;
}

.b-bar {
  background-color: var(--c-cream-soft);
  height: 100%;
}
.b-bar.w1 { width: 1px; }
.b-bar.w2 { width: 2px; }
.b-bar.w3 { width: 4px; }
.b-bar.sp { width: 3px; background: transparent; }

/* 移动端吸底 CTA: MINI VINYL PLAYER */
.mobile-sticky-cta {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background-color: #121214;
  border-top: 2px solid var(--c-burnt-orange);
  padding: 0.75rem 1.25rem;
  z-index: 250;
  justify-content: space-between;
  align-items: center;
  box-shadow: 0 -6px 16px rgba(0, 0, 0, 0.4);
}

.mobile-sticky-left {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.mini-spinning-vinyl {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: radial-gradient(circle at center, #c85a17 5px, #18181b 6px, #101012 100%);
  border: 1px solid #383842;
  animation: vinylSpin 6s linear infinite;
  flex-shrink: 0;
}

.mobile-sticky-title {
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--c-cream);
}

.mobile-sticky-sub {
  font-size: 0.76rem;
  color: var(--text-cream-muted);
}

.mobile-sticky-btn {
  background-color: var(--c-burnt-orange);
  color: #ffffff;
  padding: 0.6rem 1.25rem;
  border: 1px solid var(--c-jet-black);
  border-radius: 4px;
  font-size: 0.92rem;
  font-weight: 800;
}

/* ===================================================================
   ARTICLE & INTERNAL PAGES: EDITORIAL MUSIC / LINER NOTES STYLE
   =================================================================== */
.breadcrumb-nav {
  padding: 1.25rem 0;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--text-muted);
  border-bottom: 2px solid var(--c-jet-black);
  background-color: var(--c-cream-soft);
}

.breadcrumb-list {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
}

.page-main-content {
  padding: 3.5rem 0 5.5rem;
  background-color: var(--c-cream);
  flex-grow: 1;
}

.page-header-block {
  margin-bottom: 2.5rem;
  border-bottom: 2px solid var(--c-jet-black);
  padding-bottom: 1.75rem;
}

.page-h1-title {
  font-size: 2.45rem;
  font-weight: 900;
  color: var(--c-jet-black);
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: 0.85rem;
}

.page-meta-row {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--c-burnt-orange);
}

.article-content {
  font-size: 1.06rem;
  color: var(--c-jet-black);
  line-height: 1.8;
}

.article-content p {
  margin-bottom: 1.5rem;
}

.article-content h2 {
  font-size: 1.6rem;
  font-weight: 900;
  color: var(--c-jet-black);
  margin-top: 2.75rem;
  margin-bottom: 1.15rem;
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--c-jet-black);
}

.article-content h3 {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--c-burnt-orange);
  margin-top: 1.75rem;
  margin-bottom: 0.75rem;
}

.article-content ul, .article-content ol {
  margin-bottom: 1.5rem;
  padding-left: 1.5rem;
}

.article-content li {
  margin-bottom: 0.5rem;
}

.article-content blockquote {
  border-left: 4px solid var(--c-burnt-orange);
  background-color: var(--c-cream-soft);
  padding: 1.15rem 1.5rem;
  margin: 1.75rem 0;
  border-radius: 0 4px 4px 0;
  font-weight: 500;
}

.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  font-size: 0.95rem;
  border: 2px solid var(--c-jet-black);
}

.article-content th, .article-content td {
  padding: 0.85rem 1rem;
  border: 1px solid var(--c-jet-black);
  text-align: left;
}

.article-content th {
  background-color: var(--c-jet-black);
  color: var(--c-cream);
  font-family: var(--font-mono);
  font-weight: 800;
}

.article-cta-box {
  margin-top: 3.5rem;
  background-color: var(--c-cream-soft);
  border: 3px solid var(--c-jet-black);
  box-shadow: var(--shadow-album);
  border-radius: 8px;
  padding: 2.5rem;
  text-align: center;
}

.article-cta-title {
  font-size: 1.5rem;
  font-weight: 900;
  color: var(--c-jet-black);
  margin-bottom: 0.5rem;
}

.article-cta-desc {
  font-size: 1rem;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.article-rel-links {
  margin-top: 3rem;
  padding-top: 1.75rem;
  border-top: 2px dashed var(--c-jet-black);
}

.article-rel-title {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  font-weight: 800;
  color: var(--c-burnt-orange);
  margin-bottom: 0.85rem;
  text-transform: uppercase;
}

.article-rel-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

/* 指南中心卡片 */
.guides-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.75rem;
  margin-top: 2.5rem;
}

.guide-card {
  background-color: #ffffff;
  border: 2px solid var(--c-jet-black);
  box-shadow: var(--shadow-album);
  border-radius: 6px;
  padding: 2rem;
  display: flex;
  flex-direction: column;
  transition: all var(--transition-smooth);
}

.guide-card:hover {
  transform: translate(-3px, -3px);
  box-shadow: var(--shadow-album-lg);
  border-color: var(--c-burnt-orange);
}

.guide-card-meta {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  font-weight: 800;
  color: var(--c-burnt-orange);
  margin-bottom: 0.65rem;
}

.guide-card-title {
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--c-jet-black);
  margin-bottom: 0.65rem;
  line-height: 1.35;
}

.guide-card-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 1.25rem;
  flex-grow: 1;
}

.guide-card-link {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--c-burnt-orange);
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

/* 响应式断点 */
@media (max-width: 992px) {
  .hero-studio-grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .vinyl-disc-stage {
    order: -1;
  }

  .benefits-album-grid,
  .features-track-grid,
  .sleeve-scenarios-grid,
  .pricing-editions-grid,
  .guides-grid {
    grid-template-columns: 1fr;
  }

  .ecosystem-album-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-studio-grid,
  .footer-top-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
  }
}

@media (max-width: 768px) {
  .track-nav {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .hero-main-title {
    font-size: 2.25rem;
  }

  .hero-vinyl-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn-vinyl-play, .btn-vinyl-secondary {
    width: 100%;
    justify-content: center;
  }

  .vinyl-disc-sleeve {
    width: 290px;
    height: 290px;
  }

  .vinyl-record {
    width: 260px;
    height: 260px;
  }

  .vinyl-center-label {
    width: 100px;
    height: 100px;
  }

  .footer-studio-grid,
  .footer-top-grid {
    grid-template-columns: 1fr;
  }

  .footer-bottom-bar {
    flex-direction: column;
    align-items: flex-start;
  }

  body {
    padding-bottom: 64px;
  }
}