/* ============================================================
   音智新媒 · AI 音乐精修工作台
   Design system — Organic anchor
   ============================================================ */

/* ---------- Tokens ---------- */
:root {
  /* Surface — sand / 宣纸 */
  --sand:        #E8DCC7;
  --sand-deep:   #DCCDB2;
  --oat:         #D4B895;

  /* Earth palette (mineral pigments) */
  --sage:        #8B9D83;
  --clay:        #B08B6E;
  --terracotta:  #C66B3D;
  /* 陶土加深版：仅用于文字与 hover 底，保证沙色底上 ≥4.5:1 */
  --terracotta-deep: #87401F;
  --ochre:       #C08E3A;
  --moss:        #606C38;

  /* Ink */
  --ink:         #2E2620;
  --ink-soft:    #5A4E42;
  --ink-faint:   #6B5D50;

  /* Signal */
  --ok:          #6E7F4E;
  --warn:        #C08E3A;
  --bad:         #B4472F;

  /* Type：Google Fonts 不可达时由系统衬线/无衬线栈接管，保持 Organic 气质 */
  --display: "Fraunces", "Noto Serif SC", "Songti SC", "STSong", Georgia, serif;
  --body:    "Epilogue", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", -apple-system, "Segoe UI", sans-serif;

  /* Structure */
  --r-sm: 12px;
  --r-md: 18px;
  --r-lg: 26px;
  --r-xl: 32px;

  --ease: cubic-bezier(.22, .61, .36, 1);
  --ease-soft: cubic-bezier(.4, 0, .2, 1);

  --shadow-1: 0 1px 2px rgba(46,38,32,.05), 0 6px 18px rgba(46,38,32,.055);
  --shadow-2: 0 2px 4px rgba(46,38,32,.06), 0 18px 44px rgba(46,38,32,.09);

  --measure: 68ch;
  --gutter: clamp(20px, 5vw, 72px);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--sand);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.65;
  font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img, svg, canvas { display: block; max-width: 100%; }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; border: none; background: none; }
h1, h2, h3, h4 { margin: 0; font-family: var(--display); font-weight: 500; line-height: 1.12; letter-spacing: -.015em; }
p  { margin: 0; }
ul { margin: 0; padding: 0; list-style: none; }

/* ---------- Grain texture ---------- */
.grain {
  position: fixed; inset: 0; z-index: 9999;
  pointer-events: none;
  opacity: .038;
  mix-blend-mode: multiply;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.82' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

/* ============================================================
   宫商角徵羽 — the pentatonic progress rail (differentiator)
   ============================================================ */
.rail {
  position: fixed;
  left: clamp(12px, 2.2vw, 30px);
  top: 50%;
  transform: translateY(-50%);
  z-index: 90;
  display: flex;
  flex-direction: column;
  gap: 22px;
}
.rail-item {
  display: flex;
  align-items: center;
  gap: 12px;
  opacity: .32;
  transition: opacity .45s var(--ease);
}
.rail-item.is-active { opacity: 1; }
.rail-item.is-done   { opacity: .62; }

.rail-mark {
  position: relative;
  width: 12px; height: 12px;
  border-radius: 50%;
  border: 1.5px solid var(--ink-faint);
  background: transparent;
  flex-shrink: 0;
  transition: all .45s var(--ease);
}
.rail-item.is-active .rail-mark {
  border-color: var(--terracotta);
  background: var(--terracotta);
  box-shadow: 0 0 0 5px rgba(198,103,61,.16);
}
.rail-item.is-done .rail-mark {
  border-color: var(--moss);
  background: var(--moss);
}
.rail-mark::after {
  content: "";
  position: absolute; inset: -7px;
  border-radius: 50%;
  border: 1px solid transparent;
  transition: border-color .45s var(--ease);
}
.rail-item.is-active .rail-mark::after { border-color: rgba(198,103,61,.3); }

.rail-glyph {
  font-family: var(--display);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--ink-soft);
  white-space: nowrap;
}
.rail-item.is-active .rail-glyph { color: var(--terracotta-deep); }

.rail-line {
  position: absolute;
  left: 5.5px; top: -22px;
  width: 1px; height: 22px;
  background: var(--ink-faint);
  opacity: .3;
}

@media (max-width: 900px) {
  .rail {
    left: 0; right: 0; top: auto; bottom: 0;
    transform: none;
    flex-direction: row;
    justify-content: space-around;
    gap: 0;
    padding: 10px 8px calc(10px + env(safe-area-inset-bottom));
    background: rgba(232,220,199,.92);
    backdrop-filter: blur(14px);
    border-top: 1px solid rgba(46,38,32,.1);
  }
  .rail-line { display: none; }
  .rail-item { flex-direction: column; gap: 5px; }
  .rail-glyph { font-size: 11px; letter-spacing: .06em; }
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: clamp(80px, 12vh, 140px) var(--gutter) clamp(60px, 10vh, 110px);
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 90% 70% at 78% 18%, rgba(192,142,58,.16), transparent 62%),
    radial-gradient(ellipse 70% 60% at 12% 88%, rgba(139,157,131,.18), transparent 60%);
}
.hero-bg img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 1.6s var(--ease-soft);
  mix-blend-mode: multiply;
}
.hero-bg img.is-ready { opacity: .3; }

/* breathing ink wash */
.hero-wash {
  position: absolute;
  right: -8%; top: 6%;
  width: min(760px, 72vw);
  aspect-ratio: 1;
  border-radius: 50%;
  background: radial-gradient(circle at 38% 42%, rgba(176,139,110,.28), rgba(176,139,110,0) 68%);
  filter: blur(28px);
  animation: breathe 13s var(--ease-soft) infinite;
  z-index: 0;
}
@keyframes breathe {
  0%,100% { transform: scale(1) translate(0,0); opacity: .78; }
  50%     { transform: scale(1.11) translate(-2.2%, 2.6%); opacity: 1; }
}

.hero-inner { position: relative; z-index: 2; max-width: 1180px; }

.brandmark {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  margin-bottom: clamp(28px, 5vh, 52px);
}
.brandmark-dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--terracotta);
}
.brandmark-text {
  font-family: var(--display);
  font-size: 13px;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

.hero h1 {
  font-size: clamp(2.55rem, 6.6vw, 5.6rem);
  line-height: .98;
  letter-spacing: -.032em;
  font-weight: 400;
  margin-bottom: clamp(18px, 2.8vh, 30px);
  max-width: 14ch;
}
.hero h1 .en {
  display: block;
  font-family: var(--display);
  font-style: italic;
  font-size: .255em;
  letter-spacing: .012em;
  color: var(--clay);
  margin-top: .62em;
  font-weight: 400;
  max-width: 34ch;
  line-height: 1.35;
}

.hero-thesis {
  font-family: var(--display);
  font-size: clamp(1.12rem, 2.05vw, 1.62rem);
  line-height: 1.48;
  max-width: 30ch;
  color: var(--ink);
  margin-bottom: clamp(22px, 3.4vh, 38px);
}
.hero-thesis em {
  font-style: normal;
  color: var(--terracotta-deep);
  border-bottom: 1.5px solid rgba(198,103,61,.35);
  padding-bottom: 2px;
}

.hero-lede {
  max-width: 52ch;
  color: var(--ink-soft);
  font-size: clamp(.97rem, 1.35vw, 1.115rem);
  line-height: 1.78;
  margin-bottom: clamp(34px, 5vh, 58px);
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 13px; align-items: center; }

/* Three-stage strip */
.stages {
  position: relative; z-index: 2;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  margin-top: clamp(52px, 9vh, 104px);
  background: rgba(46,38,32,.11);
  border-radius: var(--r-lg);
  overflow: hidden;
  max-width: 1180px;
}
.stage {
  background: rgba(232,220,199,.68);
  backdrop-filter: blur(7px);
  padding: clamp(22px, 2.6vw, 34px);
  transition: background .5s var(--ease);
}
.stage:hover { background: rgba(220,205,178,.86); }
.stage-num {
  font-family: var(--display);
  font-size: 12px;
  letter-spacing: .22em;
  color: var(--terracotta-deep);
  margin-bottom: 14px;
}
.stage h2 {
  font-size: clamp(1.14rem, 1.8vw, 1.42rem);
  margin-bottom: 9px;
}
.stage p { font-size: .905rem; color: var(--ink-soft); line-height: 1.68; }
.stage-glyph {
  font-family: var(--display);
  font-size: clamp(2.1rem, 3.6vw, 3rem);
  color: var(--oat);
  line-height: 1;
  margin-bottom: 12px;
}

@media (max-width: 760px) {
  .stages { grid-template-columns: 1fr; }
}

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 13px 25px;
  border-radius: 999px;
  font-family: var(--body);
  font-size: .905rem;
  font-weight: 500;
  letter-spacing: .012em;
  transition: transform .32s var(--ease), background .32s var(--ease),
              color .32s var(--ease), box-shadow .32s var(--ease), opacity .32s;
  will-change: transform;
}
.btn:active { transform: scale(.972); }
.btn-primary {
  background: var(--ink);
  color: var(--sand);
  box-shadow: var(--shadow-1);
}
.btn-primary:hover {
  background: var(--terracotta-deep);
  transform: translateY(-2px);
  box-shadow: var(--shadow-2);
}
.btn-ghost {
  background: transparent;
  color: var(--ink);
  box-shadow: inset 0 0 0 1.2px rgba(46,38,32,.22);
}
.btn-ghost:hover {
  box-shadow: inset 0 0 0 1.2px var(--ink);
  transform: translateY(-2px);
}
.btn:disabled { opacity: .38; pointer-events: none; }

.btn-icon {
  width: 42px; height: 42px;
  padding: 0;
  border-radius: 50%;
  display: inline-flex; align-items: center; justify-content: center;
  background: var(--ink);
  color: var(--sand);
  transition: all .32s var(--ease);
}
.btn-icon:hover { background: var(--terracotta-deep); transform: scale(1.07); }
.btn-icon svg { width: 15px; height: 15px; }

/* ============================================================
   Sections
   ============================================================ */
.section {
  position: relative;
  padding: clamp(78px, 12vh, 150px) var(--gutter);
  max-width: 1320px;
  margin: 0 auto;
}
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 14px 26px;
  margin-bottom: clamp(30px, 4.6vh, 52px);
  padding-bottom: 22px;
  border-bottom: 1px solid rgba(46,38,32,.13);
}
.section-idx {
  font-family: var(--display);
  font-size: 12px;
  letter-spacing: .26em;
  color: var(--terracotta-deep);
}
.section-head h2 {
  font-size: clamp(1.85rem, 4.1vw, 3.05rem);
  letter-spacing: -.026em;
  flex: 1 1 auto;
  min-width: 12ch;
}
.section-head .hint {
  font-size: .855rem;
  color: var(--ink-faint);
  letter-spacing: .03em;
  max-width: 32ch;
  line-height: 1.6;
}

/* Cards */
.card {
  background: rgba(236,226,209,.72);
  border-radius: var(--r-lg);
  padding: clamp(20px, 2.5vw, 30px);
  box-shadow: var(--shadow-1);
  transition: transform .42s var(--ease), box-shadow .42s var(--ease);
}
.card:hover { transform: translateY(-3px); box-shadow: var(--shadow-2); }
.card-title {
  font-family: var(--display);
  font-size: .815rem;
  letter-spacing: .185em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 9px;
}
.card-title::before {
  content: "";
  width: 5px; height: 5px; border-radius: 50%;
  background: var(--terracotta);
  flex-shrink: 0;
}

/* ---------- Import / dropzone ---------- */
.dropzone {
  position: relative;
  border-radius: var(--r-xl);
  padding: clamp(38px, 7vw, 78px) clamp(24px, 4vw, 56px);
  text-align: center;
  background:
    radial-gradient(ellipse 100% 120% at 50% 0%, rgba(192,142,58,.13), transparent 68%),
    rgba(236,226,209,.6);
  box-shadow: inset 0 0 0 1.4px rgba(46,38,32,.14);
  transition: all .42s var(--ease);
  overflow: hidden;
}
.dropzone.is-over {
  box-shadow: inset 0 0 0 2px var(--terracotta);
  background:
    radial-gradient(ellipse 100% 120% at 50% 0%, rgba(198,103,61,.19), transparent 68%),
    rgba(236,226,209,.82);
  transform: scale(1.008);
}
.dropzone-glyph {
  font-family: var(--display);
  font-size: clamp(2.6rem, 6vw, 4.2rem);
  color: var(--oat);
  line-height: 1;
  margin-bottom: 18px;
}
.dropzone h3 {
  font-size: clamp(1.35rem, 2.9vw, 2.05rem);
  margin-bottom: 11px;
}
.dropzone p { color: var(--ink-soft); max-width: 46ch; margin: 0 auto 26px; line-height: 1.72; }
.dropzone-actions { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
.dropzone-meta {
  margin-top: 22px;
  font-size: .785rem;
  color: var(--ink-faint);
  letter-spacing: .04em;
}

/* ---------- Metric grid ---------- */
.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(168px, 1fr));
  gap: 1px;
  background: rgba(46,38,32,.1);
  border-radius: var(--r-md);
  overflow: hidden;
}
.metric {
  background: rgba(236,226,209,.9);
  padding: 19px 18px;
}
.metric-label {
  font-size: .735rem;
  letter-spacing: .135em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 9px;
}
.metric-value {
  font-family: var(--display);
  font-size: clamp(1.55rem, 2.85vw, 2.15rem);
  line-height: 1.06;
  letter-spacing: -.022em;
  color: var(--ink);
}
.metric-value .unit {
  font-size: .45em;
  letter-spacing: .06em;
  color: var(--ink-faint);
  margin-left: 3px;
}
.metric-sub {
  margin-top: 6px;
  font-size: .775rem;
  color: var(--ink-soft);
  line-height: 1.5;
}
.metric-value.is-empty { color: var(--ink-faint); }

/* ---------- Pentatonic mode dial (signature) ---------- */
.mode-dial {
  display: grid;
  grid-template-columns: minmax(190px, 240px) 1fr;
  gap: clamp(22px, 3.5vw, 44px);
  align-items: center;
}
@media (max-width: 700px) { .mode-dial { grid-template-columns: 1fr; } }

.mode-ring { position: relative; width: 100%; max-width: 240px; margin: 0 auto; }
.mode-ring svg { width: 100%; height: auto; overflow: visible; }
.mode-ring-label {
  position: absolute; inset: 0;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  pointer-events: none;
}
.mode-ring-label .glyph {
  font-family: var(--display);
  font-size: clamp(2.4rem, 5vw, 3.3rem);
  line-height: 1;
  color: var(--terracotta-deep);
}
.mode-ring-label .name {
  font-family: var(--display);
  font-size: .855rem;
  letter-spacing: .19em;
  color: var(--ink-soft);
  margin-top: 5px;
}

.chroma-bars { display: flex; flex-direction: column; gap: 8px; }
.chroma-row {
  display: grid;
  grid-template-columns: 30px 1fr 46px;
  align-items: center;
  gap: 11px;
}
.chroma-name {
  font-family: var(--display);
  font-size: .865rem;
  color: var(--ink-soft);
}
.chroma-track {
  display: block;
  height: 7px;
  border-radius: 999px;
  background: rgba(46,38,32,.09);
  overflow: hidden;
}
.chroma-fill {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: var(--clay);
  transform-origin: left;
  transition: width .75s var(--ease);
}
.chroma-row.is-scale .chroma-fill { background: var(--terracotta); }
.chroma-row.is-scale .chroma-name { color: var(--terracotta-deep); font-weight: 600; }
.chroma-val {
  font-family: var(--display);
  font-size: .785rem;
  color: var(--ink-faint);
  text-align: right;
}

/* ---------- Charts ---------- */
.chart-wrap {
  position: relative;
  border-radius: var(--r-md);
  background: rgba(236,226,209,.85);
  overflow: hidden;
}
.chart-wrap canvas { width: 100%; height: auto; display: block; }
.chart-legend {
  display: flex; flex-wrap: wrap; gap: 15px;
  padding: 13px 18px;
  border-top: 1px solid rgba(46,38,32,.1);
  font-size: .775rem;
  color: var(--ink-soft);
}
.legend-item { display: inline-flex; align-items: center; gap: 7px; }
.legend-swatch { width: 11px; height: 3px; border-radius: 2px; }

/* ---------- 播放走带 ---------- */
.btn-sm { padding: 9px 18px; font-size: .845rem; }
.transport {
  display: flex; align-items: center; gap: 14px;
  padding: 13px 18px;
  border-top: 1px solid rgba(46,38,32,.1);
}
.transport-bar {
  position: relative; flex: 1;
  height: 6px; border-radius: 999px;
  background: rgba(46,38,32,.14);
  cursor: pointer;
}
.transport-bar:hover { background: rgba(46,38,32,.2); }
.transport-bar:focus-visible {
  outline: 2px solid var(--terracotta);
  outline-offset: 3px;
}
.transport-fill {
  position: absolute; inset: 0 auto 0 0;
  width: 0;
  border-radius: 999px;
  background: var(--terracotta);
  pointer-events: none;
}
.transport-fill::after {
  content: '';
  position: absolute; right: -5px; top: 50%;
  width: 11px; height: 11px; margin-top: -5.5px;
  border-radius: 50%;
  background: var(--terracotta);
  box-shadow: 0 1px 4px rgba(46,38,32,.28);
}
.transport-time {
  font-variant-numeric: tabular-nums;
  font-size: .8rem; color: var(--ink-soft);
  white-space: nowrap;
}
.transport-inline .tag { margin-left: 2px; }
@media (max-width: 560px) {
  .transport { flex-wrap: wrap; gap: 10px; }
  .transport-bar { order: 3; flex-basis: 100%; }
}

/* ---------- EQ panel ---------- */
.eq-layout {
  display: grid;
  grid-template-columns: 1fr minmax(240px, 320px);
  gap: clamp(20px, 3vw, 38px);
  align-items: start;
}
@media (max-width: 940px) { .eq-layout { grid-template-columns: 1fr; } }
/* grid item 不允许再撑爆 1fr 轨道（390px 下曾把图表一起顶到 398px） */
.eq-layout > * { min-width: 0; }

.eq-bands {
  display: flex;
  gap: clamp(6px, 1.1vw, 13px);
  justify-content: space-between;
  padding: 8px 2px 0;
  /* overflow≠visible → 自动最小尺寸归零；整行自滚动，读数不再被 body overflow-x:hidden 裁掉 */
  overflow-x: auto;
  overflow-y: hidden;
  -webkit-overflow-scrolling: touch;
}
.eq-band {
  display: flex; flex-direction: column;
  align-items: center;
  gap: 9px;
  flex: 1;
}
.eq-band-label {
  font-family: var(--display);
  font-size: .705rem;
  letter-spacing: .05em;
  color: var(--ink-faint);
}
.eq-band.is-scale .eq-band-label { color: var(--terracotta-deep); }
/* 竖向推子：横向 range 旋转 90°，跨浏览器一致 */
.eq-band { position: relative; }
.eq-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 132px;
  height: 22px;
  margin: 55px -55px;   /* 旋转后占位仍为 22×132 */
  transform: rotate(-90deg);
  background: transparent;
  cursor: pointer;
}
.eq-slider::-webkit-slider-runnable-track {
  height: 4px; border-radius: 999px;
  background: rgba(46,38,32,.14);
}
.eq-slider::-moz-range-track {
  height: 4px; border-radius: 999px;
  background: rgba(46,38,32,.14);
}
.eq-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 17px; height: 17px;
  margin-top: -6.5px;
  border-radius: 50%;
  background: var(--terracotta);
  box-shadow: 0 2px 7px rgba(198,103,61,.42);
  transition: transform .22s var(--ease), background .22s;
}
.eq-slider::-moz-range-thumb {
  width: 17px; height: 17px; border: none;
  border-radius: 50%;
  background: var(--terracotta);
  box-shadow: 0 2px 7px rgba(198,103,61,.42);
}
.eq-slider:hover::-webkit-slider-thumb { transform: scale(1.17); }
.eq-band-val {
  font-family: var(--display);
  font-size: .725rem;
  color: var(--ink-soft);
  min-width: 34px;
  text-align: center;
}

/* Preset chips */
.chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 8px 15px;
  border-radius: 999px;
  font-size: .815rem;
  letter-spacing: .015em;
  background: rgba(46,38,32,.07);
  color: var(--ink-soft);
  transition: all .3s var(--ease);
}
.chip:hover { background: rgba(46,38,32,.13); color: var(--ink); }
.chip.is-active {
  background: var(--ink);
  color: var(--sand);
}
.chip.is-active:hover { background: var(--terracotta-deep); }

/* ---------- Tracks ---------- */
.tracks { display: flex; flex-direction: column; gap: 11px; }
.track {
  display: grid;
  grid-template-columns: 116px 1fr 68px;
  gap: 15px;
  align-items: center;
  padding: 13px 16px;
  border-radius: var(--r-md);
  background: rgba(236,226,209,.78);
  transition: all .38s var(--ease);
}
.track:hover { background: rgba(220,205,178,.95); transform: translateX(3px); }
.track-name {
  display: flex; align-items: center; gap: 9px;
  font-family: var(--display);
  font-size: .925rem;
}
.track-dot { width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; }
.track-lane {
  height: 32px;
  border-radius: 8px;
  background: rgba(46,38,32,.06);
  overflow: hidden;
  position: relative;
}
.track-notes {
  position: absolute; inset: 0;
}
.track-note {
  position: absolute;
  top: 31%;
  height: 38%;
  min-width: 3px;
  border-radius: 3px;
  background: var(--clay);
  opacity: .78;
  transition: all .35s var(--ease);
}
.track.is-active .track-note { opacity: 1; background: var(--terracotta); }
.track.is-muted { opacity: .38; }
.track-btn {
  padding: 6px 11px;
  border-radius: 8px;
  font-size: .735rem;
  letter-spacing: .075em;
  text-transform: uppercase;
  color: var(--ink-soft);
  background: rgba(46,38,32,.07);
  transition: all .28s var(--ease);
}
.track-btn:hover { background: rgba(46,38,32,.15); color: var(--ink); }
.track-btn.is-on { background: var(--moss); color: var(--sand); }

/* ---------- Loop / verification ---------- */
.checks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(238px, 1fr));
  gap: 15px;
}
.check {
  border-radius: var(--r-lg);
  padding: 23px 22px;
  background: rgba(236,226,209,.8);
  box-shadow: var(--shadow-1);
  border-left: 3px solid var(--ink-faint);
  transition: all .42s var(--ease);
}
.check.is-ok   { border-left-color: var(--ok); }
.check.is-warn { border-left-color: var(--warn); }
.check.is-bad  { border-left-color: var(--bad); }
.check:hover { transform: translateY(-3px); box-shadow: var(--shadow-2); }
.check-head {
  display: flex; align-items: center; gap: 11px;
  margin-bottom: 12px;
}
.check-icon {
  width: 26px; height: 26px;
  border-radius: 50%;
  display: grid; place-items: center;
  font-size: 12px;
  flex-shrink: 0;
}
.check.is-ok   .check-icon { background: rgba(110,127,78,.2);  color: var(--ok); }
.check.is-warn .check-icon { background: rgba(192,142,58,.22); color: var(--warn); }
.check.is-bad  .check-icon { background: rgba(180,71,47,.18);  color: var(--bad); }
.check-name { font-family: var(--display); font-size: 1.02rem; }
.check-value {
  font-family: var(--display);
  font-size: 1.62rem;
  letter-spacing: -.02em;
  margin-bottom: 7px;
}
.check p { font-size: .855rem; color: var(--ink-soft); line-height: 1.62; }

/* ---------- Version tree ---------- */
.tree {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 26px;
  align-items: stretch;
}
.tree-node {
  position: relative;
  /* 定宽：节点文字长短不一，否则长 meta 会把行挤爆、末尾箭头悬空 */
  flex: 1 1 168px;
  min-width: 148px;
  max-width: 210px;
  padding: 15px 17px;
  border-radius: var(--r-md);
  background: rgba(236,226,209,.8);
  box-shadow: var(--shadow-1);
  transition: all .38s var(--ease);
  cursor: default;
}
/* 连接符挂在节点尾部 */
.tree-node:not(:last-child)::after {
  content: "→";
  position: absolute;
  right: -22px; top: 50%;
  transform: translateY(-50%);
  color: var(--ink-faint);
  opacity: .55;
  font-family: var(--display);
  font-size: 1.05rem;
  pointer-events: none;
}
.tree-node:hover { transform: translateY(-3px); box-shadow: var(--shadow-2); }
.tree-node.is-current {
  background: var(--ink);
  color: var(--sand);
  box-shadow: var(--shadow-2);
}
.tree-node.is-current .tree-tag { color: rgba(232,220,199,.62); }
.tree-tag {
  font-family: var(--display);
  font-size: .705rem;
  letter-spacing: .19em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 7px;
}
.tree-label { font-family: var(--display); font-size: .955rem; line-height: 1.32; }
.tree-meta { margin-top: 5px; font-size: .745rem; opacity: .66; line-height: 1.45; }

/* ---------- Empty state ---------- */
.empty {
  padding: clamp(34px, 5.5vw, 58px) 24px;
  text-align: center;
  border-radius: var(--r-lg);
  background: rgba(236,226,209,.5);
  box-shadow: inset 0 0 0 1.2px rgba(46,38,32,.1);
}
.empty-glyph {
  font-family: var(--display);
  font-size: clamp(1.85rem, 4vw, 2.65rem);
  color: var(--oat);
  margin-bottom: 11px;
}
.empty h3 { font-size: 1.145rem; margin-bottom: 8px; }
.empty p { color: var(--ink-soft); font-size: .905rem; max-width: 38ch; margin: 0 auto; line-height: 1.7; }

/* ---------- Utility ---------- */
.grid-2 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: clamp(15px, 2vw, 24px);
}
.grid-3 {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(232px, 1fr));
  gap: clamp(15px, 2vw, 24px);
}
.stack { display: flex; flex-direction: column; gap: clamp(15px, 2vw, 24px); }
.row { display: flex; flex-wrap: wrap; gap: 11px; align-items: center; }
.spacer-sm { height: 15px; }
.spacer-md { height: 28px; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: .745rem;
  letter-spacing: .075em;
  text-transform: uppercase;
  background: rgba(46,38,32,.075);
  color: var(--ink-soft);
}
.tag-accent { background: rgba(135,64,31,.12); color: var(--terracotta-deep); }
.tag-ok     { background: rgba(110,127,78,.17);  color: var(--ok); }

.divider {
  height: 1px;
  background: rgba(46,38,32,.12);
  margin: clamp(28px, 4vw, 48px) 0;
}

/* ---------- Status pill (live) ---------- */
.status {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 15px;
  border-radius: 999px;
  background: rgba(46,38,32,.07);
  font-size: .815rem;
  color: var(--ink-soft);
}
.status-dot {
  width: 7px; height: 7px; border-radius: 50%;
  background: var(--ink-faint);
  flex-shrink: 0;
}
.status.is-live .status-dot {
  background: var(--ok);
  animation: pulse 1.85s var(--ease-soft) infinite;
}
@keyframes pulse {
  0%,100% { opacity: 1;   transform: scale(1); }
  50%     { opacity: .38; transform: scale(.76); }
}

/* ---------- Reveal on scroll ---------- */
.reveal {
  opacity: 0;
  transform: translateY(19px);
  transition: opacity .82s var(--ease), transform .82s var(--ease);
}
.reveal.is-in { opacity: 1; transform: none; }

/* ---------- Footer ---------- */
.footer {
  padding: clamp(52px, 8vh, 92px) var(--gutter) clamp(110px, 14vh, 150px);
  border-top: 1px solid rgba(46,38,32,.12);
  max-width: 1320px;
  margin: 0 auto;
}
.footer-inner {
  display: flex;
  flex-wrap: wrap;
  gap: 30px;
  justify-content: space-between;
  align-items: flex-end;
}
.footer-tagline {
  margin: 0;
  font-family: var(--display);
  font-weight: 500;
  line-height: 1.12;
  letter-spacing: -.015em;
  font-size: clamp(1.45rem, 3vw, 2.15rem);
  max-width: 18ch;
}
.footer-meta { font-size: .815rem; color: var(--ink-faint); line-height: 1.85; text-align: right; }
@media (max-width: 620px) { .footer-meta { text-align: left; } }

/* ---------- 谱面纸托：谱纸嵌进一圈更深的麻衬里，像压在卡纸上的乐谱 ---------- */
#scoreCard .chart-wrap {
  padding: 8px;
  background: rgba(212,184,149,.30);
  border: 1px solid rgba(176,139,110,.34);
}

/* ---------- 谱面收起：只折叠主体（纸托+口径说明），标题、标签与导出行留着 ---------- */
#scoreCard.folded #scoreBody {
  display: none;
}

/* ---------- 焦点可见（键盘导航） ---------- */
:where(a[href], button, input, select, textarea, [tabindex]):focus-visible {
  outline: 2px solid var(--terracotta);
  outline-offset: 3px;
}

/* ---------- 文字选区 ---------- */
::selection { background: rgba(198,107,61,.26); color: var(--ink); }

/* ---------- 滚动条：陶土色细条，跟走 Organic 质感 ---------- */
html { scrollbar-width: thin; scrollbar-color: rgba(176,139,110,.55) transparent; }
::-webkit-scrollbar { width: 11px; height: 11px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: rgba(176,139,110,.5);
  border-radius: 999px;
  border: 3px solid transparent;
  background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover { background: rgba(176,139,110,.78); background-clip: padding-box; }

/* ---------- Motion preferences ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .14s !important;
    scroll-behavior: auto !important;
  }
  .hero-wash { animation: none; }
}