/* ============================================================
   声音志 · Sound Journal
   ── 侘寂之境 · The Realm of Wabi-Sabi ──
   Inspired by: MUJI · Sugimoto Hiroshi · Kore-eda Hirokazu
                 Nagaoka Kenmei · Ito Toyo · Kyoto machiya
   ============================================================ */

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

/* ============================================================
   TOKENS · 和紙の調色盤
   ============================================================ */
:root {
  /* 和纸 surfaces — washi */
  --washi:        #f5f1e8;
  --washi-soft:   #ede8db;
  --washi-deep:   #e3dcc9;
  --washi-card:   #faf6ec;

  /* 墨 ink */
  --sumi:         #1a1612;
  --sumi-soft:    #3a3530;
  --sumi-mid:     #6a6358;
  --sumi-light:   #a39d90;
  --sumi-faint:   #d4cfc0;

  /* 朱砂 vermilion — single accent */
  --shu:          #a8341c;
  --shu-soft:     #c25141;
  --shu-faint:    #d99683;

  /* 苔 moss — secondary accent */
  --moss:         #5b6e4f;
  --moss-soft:    #7a8d6e;

  /* 線 line */
  --kagi:         #c4bca9;
  --kagi-soft:    #ddd5c0;
  --kagi-bold:    #1a1612;

  /* type */
  --mincho: 'Noto Serif JP', 'Noto Serif SC', 'Hiragino Mincho ProN',
            'YuMincho', 'Songti SC', 'STSong', 'SimSun', serif;
  --serif:  'Noto Serif SC', 'Noto Serif JP', 'Hiragino Mincho ProN',
            'Songti SC', 'STSong', serif;
  --latin:  'Cormorant Garamond', 'EB Garamond', 'Garamond',
            'Times New Roman', serif;
  --mono:   'JetBrains Mono', 'SF Mono', Menlo, monospace;

  /* rhythm */
  --ease:       cubic-bezier(0.22, 1, 0.36, 1);
  --ease-soft:  cubic-bezier(0.4, 0, 0.2, 1);
  --ease-quiet: cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --d-fast: 0.24s;
  --d-mid:  0.6s;
  --d-slow: 1.2s;
  --d-deep: 2s;
}

[data-theme="dark"] {
  --washi:        #0e0d0a;
  --washi-soft:   #161412;
  --washi-deep:   #1f1c17;
  --washi-card:   #1a1815;

  --sumi:         #e8e3d3;
  --sumi-soft:    #c4bfb0;
  --sumi-mid:     #8a8576;
  --sumi-light:   #5a564c;
  --sumi-faint:   #3a372f;

  --shu:          #c25141;
  --shu-soft:     #d96a55;
  --shu-faint:    #8a3a2a;

  --moss:         #7a8d6e;

  --kagi:         #2a2722;
  --kagi-soft:    #1f1e1a;
  --kagi-bold:    #e8e3d3;
}

/* ============================================================
   BASE
   ============================================================ */
html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  font-family: var(--serif);
  font-weight: 300;
  background: var(--washi);
  color: var(--sumi);
  line-height: 1.85;
  overflow-x: hidden;
  transition: background var(--d-deep) var(--ease-quiet),
              color var(--d-deep) var(--ease-quiet);
  font-feature-settings: "kern" 1, "liga" 1, "calt" 1, "palt" 1;
  letter-spacing: 0.02em;
  position: relative;
  min-height: 100vh;
}

/* 和纸纹理 — very subtle paper grain */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.4;
  mix-blend-mode: multiply;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(0,0,0,0.012) 0%, transparent 60%),
    radial-gradient(circle at 80% 70%, rgba(0,0,0,0.015) 0%, transparent 60%),
    radial-gradient(circle at 50% 50%, rgba(168,52,28,0.005) 0%, transparent 70%);
}
[data-theme="dark"] body::before {
  mix-blend-mode: screen;
  opacity: 0.5;
  background-image:
    radial-gradient(circle at 20% 30%, rgba(232,227,211,0.015) 0%, transparent 60%),
    radial-gradient(circle at 80% 70%, rgba(232,227,211,0.018) 0%, transparent 60%);
}

a { color: inherit; text-decoration: none; }
button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  color: inherit;
}
::selection { background: var(--sumi); color: var(--washi); }

/* ============================================================
   TYPOGRAPHY · 文字
   ============================================================ */
.kanji {
  font-family: var(--mincho);
  font-feature-settings: "palt" 1;
}
.latin {
  font-family: var(--latin);
  font-feature-settings: "lnum" 1;
}
.mono {
  font-family: var(--mono);
  font-feature-settings: "tnum" 1;
}
.small-caps {
  font-family: var(--mono);
  text-transform: uppercase;
  letter-spacing: 0.22em;
  font-size: 0.68rem;
}

/* ============================================================
   LAYOUT
   ============================================================ */
.frame {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 80px;
  position: relative;
  z-index: 1;
}
@media (max-width: 960px) { .frame { padding: 0 40px; } }
@media (max-width: 640px) { .frame { padding: 0 24px; } }

/* ============================================================
   NAV · 標
   ============================================================ */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  background: color-mix(in oklab, var(--washi) 76%, transparent);
  border-bottom: 1px solid transparent;
  transition: border-color var(--d-mid) var(--ease-quiet),
              background var(--d-mid) var(--ease-quiet);
}
.nav.scrolled {
  border-bottom-color: var(--kagi);
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--mincho);
  font-weight: 500;
}
.nav-brand-seal {
  width: 26px;
  height: 26px;
  border: 1.5px solid var(--shu);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--shu);
  font-family: var(--mincho);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0;
  flex-shrink: 0;
  position: relative;
  transition: transform var(--d-mid) var(--ease);
}
.nav-brand:hover .nav-brand-seal {
  transform: rotate(45deg);
}
.nav-brand-text {
  font-size: 0.95rem;
  letter-spacing: 0.14em;
  color: var(--sumi);
  font-weight: 500;
}
.nav-brand-romaji {
  font-family: var(--latin);
  font-size: 0.7rem;
  font-style: italic;
  color: var(--sumi-mid);
  margin-left: 4px;
  letter-spacing: 0.04em;
  font-weight: 400;
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 28px;
}
.nav-meta {
  font-family: var(--mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  color: var(--sumi-mid);
  display: flex;
  align-items: center;
  gap: 12px;
}
.nav-meta::before {
  content: '';
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--shu);
  display: inline-block;
  animation: breathe 3s ease-in-out infinite;
}
@keyframes breathe {
  0%, 100% { opacity: 0.4; }
  50%      { opacity: 1; }
}

.theme-toggle {
  width: 34px;
  height: 34px;
  border: 1px solid var(--kagi);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--sumi-soft);
  transition: all var(--d-fast) var(--ease-quiet);
}
.theme-toggle:hover {
  border-color: var(--sumi);
  color: var(--sumi);
  transform: rotate(180deg);
}
.theme-toggle .icon-moon { display: none; }
[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
[data-theme="dark"] .theme-toggle .icon-moon { display: block; }

/* ============================================================
   HERO · 序
   ============================================================ */
.hero {
  padding-top: 160px;
  padding-bottom: 140px;
  position: relative;
  overflow: hidden;
}

/* 大型和纸纹背景圆 */
.hero-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.6;
}
.hero-bg-circle {
  position: absolute;
  top: -300px;
  right: -300px;
  width: 900px;
  height: 900px;
  border: 1px solid var(--kagi-soft);
  border-radius: 50%;
  opacity: 0.6;
}
.hero-bg-circle::before,
.hero-bg-circle::after {
  content: '';
  position: absolute;
  inset: 80px;
  border: 1px solid var(--kagi-soft);
  border-radius: 50%;
  opacity: 0.5;
}
.hero-bg-circle::after {
  inset: 180px;
  opacity: 0.25;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.7fr 1fr;
  gap: 100px;
  align-items: end;
  position: relative;
  z-index: 2;
}

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--sumi-mid);
  margin-bottom: 48px;
  text-transform: uppercase;
}
.hero-eyebrow-line {
  flex: 0 0 40px;
  height: 1px;
  background: var(--sumi-mid);
}

.hero-title {
  position: relative;
  margin-bottom: 36px;
}
.hero-title-ja {
  display: block;
  font-family: var(--mincho);
  font-weight: 400;
  font-size: clamp(4.2rem, 11vw, 9rem);
  line-height: 0.92;
  letter-spacing: 0.04em;
  color: var(--sumi);
}
.hero-title-ja .stroke {
  -webkit-text-stroke: 1.5px var(--sumi);
  -webkit-text-fill-color: transparent;
  color: transparent;
  margin: 0 -0.04em;
  display: inline-block;
}
.hero-title-zh {
  display: flex;
  align-items: baseline;
  gap: 18px;
  margin-top: 16px;
  font-family: var(--mincho);
  font-size: clamp(1.8rem, 3.8vw, 3rem);
  font-weight: 300;
  color: var(--sumi-soft);
  letter-spacing: 0.32em;
}
.hero-title-zh-romaji {
  font-family: var(--latin);
  font-style: italic;
  font-size: 0.42em;
  color: var(--sumi-mid);
  letter-spacing: 0.04em;
  font-weight: 400;
}

.hero-sub {
  font-family: var(--serif);
  font-size: clamp(1rem, 1.3vw, 1.15rem);
  font-weight: 300;
  color: var(--sumi-soft);
  letter-spacing: 0.06em;
  max-width: 480px;
  line-height: 2.1;
}
.hero-sub em {
  font-style: normal;
  border-bottom: 1px solid var(--shu);
  padding-bottom: 1px;
  color: var(--sumi);
}

.hero-meta {
  padding-bottom: 12px;
}
.meta-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px 40px;
  border-top: 1px solid var(--kagi);
  padding-top: 26px;
}
.meta-cell {
  position: relative;
}
.meta-cell dt {
  font-family: var(--mono);
  font-size: 0.6rem;
  letter-spacing: 0.22em;
  color: var(--sumi-light);
  text-transform: uppercase;
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.meta-cell dt::before {
  content: '';
  width: 12px;
  height: 1px;
  background: var(--shu);
}
.meta-cell dd {
  font-family: var(--serif);
  font-size: 1rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--sumi);
}
.meta-cell .meta-num {
  font-family: var(--latin);
  font-style: italic;
  font-size: 1.2rem;
  color: var(--shu);
}

.hero-divider {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-top: 100px;
  font-family: var(--mincho);
  font-size: 0.82rem;
  letter-spacing: 0.36em;
  color: var(--sumi-mid);
}
.hero-divider-line {
  flex: 1;
  height: 1px;
  background: linear-gradient(to right, transparent, var(--kagi) 20%, var(--kagi) 80%, transparent);
  position: relative;
}
.hero-divider-line::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 5px;
  height: 5px;
  background: var(--washi);
  border: 1px solid var(--sumi-mid);
  border-radius: 50%;
}

/* ============================================================
   TRACK LIST · 曲目
   ============================================================ */
.tracks {
  padding-top: 32px;
  padding-bottom: 140px;
  min-height: 400px;
}

/* 曲目之间的章节分隔 */
.track-section {
  margin-bottom: 200px;
}
.track-section:last-child { margin-bottom: 0; }

.track-section-header {
  display: flex;
  align-items: baseline;
  gap: 24px;
  margin-bottom: 64px;
  padding-bottom: 28px;
  border-bottom: 1px solid var(--kagi);
}
.track-section-num {
  font-family: var(--latin);
  font-style: italic;
  font-size: 1.8rem;
  color: var(--shu);
  font-weight: 400;
  letter-spacing: 0.02em;
}
.track-section-title {
  font-family: var(--mincho);
  font-size: 1rem;
  letter-spacing: 0.4em;
  color: var(--sumi);
  font-weight: 500;
}
.track-section-romaji {
  font-family: var(--latin);
  font-style: italic;
  font-size: 0.78rem;
  color: var(--sumi-mid);
  margin-left: auto;
  letter-spacing: 0.06em;
}

.track {
  position: relative;
  padding: 64px 0;
  border-top: 1px solid var(--kagi);
}
.track:last-child {
  border-bottom: 1px solid var(--kagi);
}

/* 大型序号 — left margin */
.track-no {
  position: absolute;
  top: 80px;
  left: 0;
  width: 140px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.track-no-kanji {
  font-family: var(--mincho);
  font-size: 1.4rem;
  font-weight: 500;
  color: var(--sumi);
  letter-spacing: 0.18em;
}
.track-no-num {
  font-family: var(--latin);
  font-style: italic;
  font-size: 0.85rem;
  color: var(--sumi-mid);
  letter-spacing: 0.1em;
}
.track-no-line {
  width: 36px;
  height: 1px;
  background: var(--sumi-light);
  transition: width var(--d-mid) var(--ease-quiet),
              background var(--d-fast) var(--ease-quiet);
}
.track.playing .track-no-kanji { color: var(--shu); }
.track.playing .track-no-line {
  width: 80px;
  background: var(--shu);
}

/* 主内容 — left margin */
.track-body {
  margin-left: 140px;
  max-width: 760px;
}

.track-titles {
  display: flex;
  align-items: baseline;
  gap: 24px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.track-title {
  font-family: var(--mincho);
  font-weight: 500;
  font-size: clamp(1.9rem, 3vw, 2.6rem);
  letter-spacing: 0.12em;
  line-height: 1.3;
  color: var(--sumi);
}
.track.playing .track-title {
  color: var(--shu);
}
.track-subtitle {
  font-family: var(--latin);
  font-style: italic;
  font-weight: 400;
  font-size: clamp(1rem, 1.4vw, 1.25rem);
  color: var(--sumi-mid);
  letter-spacing: 0.04em;
}

.track-info {
  display: flex;
  align-items: center;
  gap: 18px;
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--sumi-mid);
  margin-bottom: 28px;
  text-transform: uppercase;
}
.track-style {
  color: var(--sumi);
  border-bottom: 1px solid var(--sumi-light);
  padding-bottom: 2px;
}
.track-info .track-dot {
  color: var(--sumi-light);
  font-family: var(--mincho);
}

.track-desc {
  font-family: var(--serif);
  font-size: 1.02rem;
  font-weight: 300;
  line-height: 2.05;
  color: var(--sumi-soft);
  margin-bottom: 36px;
  max-width: 640px;
  letter-spacing: 0.04em;
}

/* 标签 chips for theme */
.track-tags {
  display: flex;
  gap: 12px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}
.track-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mincho);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--sumi-soft);
  padding: 5px 0;
  border-bottom: 1px solid var(--kagi);
}

/* ============================================================
   PLAYER · 演奏
   ============================================================ */
.player {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 8px 0;
}

.player-btn {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 1px solid var(--sumi);
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--sumi);
  transition: all var(--d-fast) var(--ease-quiet);
  position: relative;
  overflow: hidden;
}
.player-btn:hover {
  background: var(--sumi);
  color: var(--washi);
  transform: scale(1.04);
}
.player-btn:active {
  transform: scale(0.96);
}
.player-btn.on {
  background: var(--shu);
  border-color: var(--shu);
  color: var(--washi);
}
.player-btn.on:hover {
  background: var(--sumi);
  border-color: var(--sumi);
}
.player-btn .player-icon-pause { display: none; }
.player-btn.on .player-icon-play { display: none; }
.player-btn.on .player-icon-pause { display: block; }

.player-bar-wrap {
  flex: 1;
  min-width: 0;
  height: 32px;
  display: flex;
  align-items: center;
  cursor: pointer;
  position: relative;
}

.player-bar {
  position: relative;
  width: 100%;
  height: 2px;
  background: var(--kagi);
  transition: height var(--d-fast) var(--ease-quiet);
}
.player-bar-wrap:hover .player-bar { height: 3px; }

.player-bar-pos {
  position: absolute;
  inset: 0;
  width: 0;
  background: var(--shu);
  transition: width 0.12s linear;
}
.player-bar-thumb {
  position: absolute;
  top: 50%;
  left: 0;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--shu);
  transform: translate(-50%, -50%) scale(0);
  transition: transform var(--d-fast) var(--ease-quiet);
  pointer-events: none;
  box-shadow: 0 0 0 4px color-mix(in oklab, var(--shu) 20%, transparent);
}
.player-bar-wrap:hover .player-bar-thumb {
  transform: translate(-50%, -50%) scale(1);
}

.player-time {
  flex-shrink: 0;
  font-family: var(--latin);
  font-style: italic;
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--sumi-mid);
  min-width: 110px;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* ============================================================
   LYRIC · 詩
   ============================================================ */
.lyric-toggle {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-family: var(--mincho);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.28em;
  color: var(--sumi-mid);
  padding: 10px 0;
  margin-top: 24px;
  border-bottom: 1px solid transparent;
  transition: all var(--d-fast) var(--ease-quiet);
  cursor: pointer;
}
.lyric-toggle:hover {
  color: var(--sumi);
  border-bottom-color: var(--sumi);
}
.lyric-toggle-mark {
  display: inline-block;
  width: 6px;
  height: 6px;
  border: 1px solid currentColor;
  border-radius: 50%;
  transition: background var(--d-fast) var(--ease-quiet);
}
.lyric-toggle[aria-expanded="true"] {
  color: var(--sumi);
}
.lyric-toggle[aria-expanded="true"] .lyric-toggle-mark {
  background: var(--shu);
  border-color: var(--shu);
}

.lyric {
  margin-top: 28px;
  animation: lyricIn var(--d-mid) var(--ease-quiet);
}
.lyric[hidden] { display: none; }
@keyframes lyricIn {
  from { opacity: 0; transform: translateY(-12px); }
  to   { opacity: 1; transform: translateY(0); }
}

.lyric-inner {
  padding: 40px 48px;
  font-family: var(--mincho);
  font-size: 1rem;
  font-weight: 300;
  line-height: 2.6;
  color: var(--sumi-soft);
  background: var(--washi-soft);
  border-left: 2px solid var(--shu);
  letter-spacing: 0.06em;
  white-space: pre-line;
  border-radius: 0 2px 2px 0;
  max-height: 480px;
  overflow-y: auto;
  position: relative;
}

/* 和纸纹理 lyric box */
.lyric-inner::before {
  content: '';
  position: absolute;
  top: 16px;
  right: 24px;
  font-family: var(--mincho);
  font-size: 0.7rem;
  color: var(--sumi-light);
  letter-spacing: 0.4em;
}
.lyric-inner.with-text::before {
  content: '詩';
}

/* 滚动条 */
.lyric-inner::-webkit-scrollbar { width: 4px; }
.lyric-inner::-webkit-scrollbar-track { background: transparent; }
.lyric-inner::-webkit-scrollbar-thumb {
  background: var(--kagi);
  border-radius: 2px;
}

/* ============================================================
   LOADING & ERROR
   ============================================================ */
.loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  padding: 120px 0;
}
.loading-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--sumi-light);
  animation: loadDot 1.6s ease-in-out infinite;
}
.loading-dot:nth-child(2) { animation-delay: 0.2s; }
.loading-dot:nth-child(3) { animation-delay: 0.4s; }
@keyframes loadDot {
  0%, 80%, 100% { opacity: 0.25; transform: scale(0.7); }
  40%           { opacity: 1; transform: scale(1); }
}

.error {
  font-family: var(--mincho);
  font-size: 1rem;
  color: var(--sumi-mid);
  text-align: center;
  padding: 120px 0;
  letter-spacing: 0.2em;
}

/* ============================================================
   ABOUT · 跋
   ============================================================ */
.about {
  padding-top: 60px;
  padding-bottom: 120px;
  position: relative;
}
.about-inner {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
  position: relative;
}
.about-mark {
  font-family: var(--mincho);
  font-size: 1.6rem;
  color: var(--shu);
  margin-bottom: 32px;
  letter-spacing: 0.6em;
  text-indent: 0.6em;
  font-weight: 300;
}
.about-text {
  font-family: var(--serif);
  font-size: 1.05rem;
  font-weight: 300;
  line-height: 2.3;
  color: var(--sumi-soft);
  letter-spacing: 0.08em;
  margin-bottom: 32px;
}
.about-text em {
  font-style: normal;
  font-weight: 500;
  color: var(--sumi);
  border-bottom: 1px solid var(--shu);
  padding-bottom: 1px;
}
.about-text-quiet {
  font-size: 0.92rem;
  color: var(--sumi-mid);
  line-height: 2.1;
  margin-top: 24px;
}
.about-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 18px;
  margin: 40px 0;
  font-family: var(--mincho);
  color: var(--sumi-light);
  letter-spacing: 0.6em;
}
.about-divider::before,
.about-divider::after {
  content: '';
  width: 60px;
  height: 1px;
  background: var(--kagi);
}

/* ============================================================
   FOOTER · 落款
   ============================================================ */
.footer {
  padding-top: 40px;
  padding-bottom: 56px;
  border-top: 1px solid var(--kagi);
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--sumi-mid);
  text-transform: uppercase;
}
.footer-inner > * {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.footer-seal {
  width: 22px;
  height: 22px;
  border: 1.5px solid var(--shu);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--shu);
  font-family: var(--mincho);
  font-size: 0.65rem;
  font-weight: 700;
  flex-shrink: 0;
}
.footer-link {
  color: var(--sumi-soft);
  border-bottom: 1px solid var(--kagi);
  padding-bottom: 2px;
  transition: all var(--d-fast) var(--ease-quiet);
}
.footer-link:hover {
  color: var(--sumi);
  border-bottom-color: var(--sumi);
}

/* ============================================================
   MINI PLAYER · 床の琴
   ============================================================ */
.mini-player {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(24px);
  z-index: 40;
  background: color-mix(in oklab, var(--washi) 92%, transparent);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border: 1px solid var(--kagi);
  border-radius: 100px;
  padding: 12px 16px 12px 24px;
  box-shadow:
    0 2px 8px color-mix(in oklab, var(--sumi) 4%, transparent),
    0 24px 64px color-mix(in oklab, var(--sumi) 12%, transparent);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--d-mid) var(--ease-quiet),
              transform var(--d-mid) var(--ease-quiet);
}
.mini-player[data-show="true"] {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

.mini-player-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  min-width: 320px;
  max-width: 540px;
}
.mini-info {
  display: flex;
  align-items: baseline;
  gap: 12px;
  min-width: 0;
  flex: 0 1 auto;
}
.mini-num {
  font-family: var(--mincho);
  font-size: 0.75rem;
  color: var(--shu);
  letter-spacing: 0.1em;
  flex-shrink: 0;
}
.mini-title {
  font-family: var(--serif);
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--sumi);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  letter-spacing: 0.04em;
}
.mini-bar-wrap {
  flex: 1;
  min-width: 80px;
  height: 20px;
  display: flex;
  align-items: center;
  cursor: pointer;
}
.mini-bar {
  position: relative;
  width: 100%;
  height: 2px;
  background: var(--kagi);
}
.mini-bar-pos {
  position: absolute;
  inset: 0;
  width: 0;
  background: var(--shu);
  transition: width 0.1s linear;
}
.mini-time {
  font-family: var(--latin);
  font-style: italic;
  font-size: 0.72rem;
  color: var(--sumi-mid);
  font-variant-numeric: tabular-nums;
  min-width: 44px;
  text-align: right;
}
.mini-btn {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1px solid var(--sumi);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--sumi);
  transition: all var(--d-fast) var(--ease-quiet);
}
.mini-btn:hover {
  background: var(--sumi);
  color: var(--washi);
}
.mini-btn.on {
  background: var(--shu);
  border-color: var(--shu);
  color: var(--washi);
}
.mini-btn .mini-icon-pause { display: none; }
.mini-btn.on .mini-icon-play { display: none; }
.mini-btn.on .mini-icon-pause { display: block; }

/* ============================================================
   TRACK STAGGER · 入場の演出
   ============================================================ */
.track {
  animation: trackIn var(--d-slow) var(--ease) backwards;
}
.track:nth-child(2) { animation-delay: 0.06s; }
.track:nth-child(3) { animation-delay: 0.12s; }
.track:nth-child(4) { animation-delay: 0.18s; }
.track:nth-child(5) { animation-delay: 0.24s; }
@keyframes trackIn {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}
@media (prefers-reduced-motion: reduce) {
  .track { animation: none !important; }
}

/* ============================================================
   INTRO ANIMATION · 序の演出
   ============================================================ */
.intro-overlay {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: var(--washi);
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  animation: introOut var(--d-deep) var(--ease-quiet) 0.3s forwards;
}
@keyframes introOut {
  0%   { opacity: 1; }
  60%  { opacity: 1; }
  100% { opacity: 0; visibility: hidden; }
}
.intro-circle {
  width: 80px;
  height: 80px;
  border: 1.5px solid var(--sumi);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--mincho);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--shu);
  animation: introScale var(--d-deep) var(--ease-quiet) forwards;
}
@keyframes introScale {
  0%   { transform: scale(0.6); opacity: 0; }
  40%  { transform: scale(1); opacity: 1; }
  100% { transform: scale(8); opacity: 0; }
}

/* ============================================================
   RESPONSIVE — tablet
   ============================================================ */
@media (max-width: 960px) {
  .hero { padding-top: 120px; padding-bottom: 100px; }
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 64px;
    align-items: start;
  }
  .meta-grid { grid-template-columns: 1fr 1fr; gap: 24px 32px; }
  .hero-divider { margin-top: 80px; }

  .track-section { margin-bottom: 140px; }
  .track-section-header { gap: 16px; margin-bottom: 48px; }
  .track-section-num { font-size: 1.4rem; }
  .track-section-title { font-size: 0.85rem; letter-spacing: 0.3em; }
  .track-section-romaji { display: none; }

  .track { padding: 56px 0; }
  .track-no { width: 100px; top: 56px; }
  .track-no-kanji { font-size: 1.1rem; }
  .track-body { margin-left: 100px; max-width: none; }
  .track-titles { gap: 14px; }
  .track-info { font-size: 0.62rem; gap: 12px; }
  .lyric-inner { padding: 32px 32px; }
}

/* ============================================================
   RESPONSIVE — mobile
   ============================================================ */
@media (max-width: 640px) {
  .nav { height: 64px; }
  .nav-meta { display: none; }
  .nav-brand-romaji { display: none; }
  .nav-actions { gap: 16px; }

  .hero { padding-top: 80px; padding-bottom: 72px; }
  .hero-bg-circle {
    width: 500px;
    height: 500px;
    top: -160px;
    right: -180px;
    opacity: 0.35;
  }
  .hero-bg-circle::before,
  .hero-bg-circle::after { display: none; }
  .hero-grid { gap: 48px; }
  .hero-eyebrow { font-size: 0.6rem; margin-bottom: 32px; letter-spacing: 0.18em; }
  .hero-title-ja { font-size: 3.6rem; letter-spacing: 0.02em; }
  .hero-title-zh { font-size: 1.5rem; letter-spacing: 0.24em; gap: 12px; }
  .hero-title-zh-romaji { font-size: 0.6rem; }
  .hero-sub { font-size: 0.95rem; line-height: 2; }
  .hero-divider { font-size: 0.7rem; letter-spacing: 0.28em; margin-top: 64px; }
  .meta-grid { grid-template-columns: 1fr 1fr; gap: 20px 20px; }

  .track-section { margin-bottom: 100px; }
  .track-section-header {
    flex-wrap: wrap;
    gap: 12px;
  }
  .track-section-title { font-size: 0.78rem; }

  .track { padding: 48px 0; }
  .track-no {
    position: relative;
    top: auto;
    left: auto;
    width: auto;
    flex-direction: row;
    align-items: center;
    gap: 14px;
    margin-bottom: 16px;
  }
  .track-no-line { width: 20px; }
  .track-no-kanji { font-size: 1rem; }
  .track-no-num { font-size: 0.7rem; }
  .track-body { margin-left: 0; }
  .track-titles { gap: 10px; margin-bottom: 14px; }
  .track-title { font-size: 1.5rem; letter-spacing: 0.08em; }
  .track-subtitle { font-size: 0.85rem; }
  .track-info {
    font-size: 0.58rem;
    gap: 10px;
    flex-wrap: wrap;
    margin-bottom: 20px;
  }
  .track-desc { font-size: 0.92rem; line-height: 1.95; margin-bottom: 28px; }

  .player { gap: 12px; }
  .player-btn { width: 40px; height: 40px; }
  .player-time { min-width: 86px; font-size: 0.72rem; }
  .lyric-inner { padding: 24px 22px; font-size: 0.92rem; line-height: 2.3; }
  .lyric-toggle { font-size: 0.7rem; }

  .about-text { font-size: 0.95rem; line-height: 2.1; }
  .about-text-quiet { font-size: 0.82rem; }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    font-size: 0.62rem;
  }

  .mini-player {
    bottom: 16px;
    left: 16px;
    right: 16px;
    transform: translateY(20px);
    border-radius: 18px;
    padding: 12px 14px 12px 18px;
  }
  .mini-player[data-show="true"] { transform: translateY(0); }
  .mini-player-inner {
    min-width: 0;
    max-width: none;
    gap: 12px;
  }
  .mini-bar-wrap { min-width: 60px; }
  .mini-title { font-size: 0.82rem; }
  .mini-info { flex: 1 1 auto; }
}

/* ============================================================
   REDUCED MOTION
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
  .track { opacity: 1; transform: none; }
  .intro-overlay { display: none; }
}