/* World is Mine — CD vs stream comparison. Dark-only, palette per dataviz skill (validated). */

:root {
  color-scheme: dark;
  --bg: #0d0d0d;
  --surface: #1a1a19;
  --surface-2: #232321;
  --border: rgba(255, 255, 255, 0.10);
  --ink: #ffffff;
  --ink-2: #c3c2b7;
  --ink-3: #898781;
  --grid: #2c2c2a;
  --axis: #383835;
  --accent: #3987e5;
  --c-cd: #3987e5;      /* slot 1 blue    — CD rip */
  --c-hires: #008300;   /* slot 2 green   — Hi-Res */
  --c-mp3: #d55181;     /* slot 3 magenta — MP3 */
  --c-nh: #c98500;      /* slot 4 yellow  — residual Hi-Res−CD */
  --c-nm: #199e70;      /* slot 5 aqua    — residual MP3−CD */
  --c-t5: #b088f9;      /* slot 7 violet  — Trail5 dynamic restore */
  --c-nt5: #e8a065;     /* slot 8 orange  — residual Trail5−CD */
  --good: #0ca30c;
  --serious: #ec835a;
  --radius: 14px;
  --maxw: 1080px;
  --font: system-ui, -apple-system, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink-2);
  font-family: var(--font);
  font-size: 15px;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { color: var(--ink); line-height: 1.3; margin: 0 0 12px; font-weight: 650; }
h2 { font-size: 26px; }
h3 { font-size: 17px; margin-bottom: 10px; }
.h3-sub { font-size: 12px; color: var(--ink-3); font-weight: 400; margin-left: 8px; }
a { color: var(--accent); text-decoration: none; }
b, strong { color: var(--ink); font-weight: 600; }
code, kbd {
  font-family: ui-monospace, Consolas, monospace;
  font-size: 0.88em;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1px 6px;
}
section { scroll-margin-top: 72px; }

.kicker {
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-3);
  margin: 0 0 6px;
  font-weight: 600;
}
.section { max-width: var(--maxw); margin: 0 auto; padding: 56px 24px 8px; }
.section-desc { max-width: 780px; margin: 0 0 20px; }
.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  margin: 16px 0;
}
.hint { font-size: 12.5px; color: var(--ink-3); margin: 10px 0 0; }
.two-col { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.two-col .panel { margin: 0; }
@media (max-width: 900px) { .two-col { grid-template-columns: 1fr; } }

/* ---------------------------------------------------------------- nav */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 10px 24px;
  background: rgba(13, 13, 13, 0.78);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-brand { color: var(--ink); font-weight: 700; font-size: 14px; white-space: nowrap; }
.nav-vs {
  margin-left: 8px;
  font-size: 11px;
  color: var(--ink-3);
  font-weight: 500;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 2px 8px;
  vertical-align: 1px;
}
.nav-links { display: flex; gap: 4px; overflow-x: auto; scrollbar-width: none; }
.nav-links::-webkit-scrollbar { display: none; }
.nav-links a {
  color: var(--ink-3);
  font-size: 13px;
  padding: 5px 10px;
  border-radius: 8px;
  white-space: nowrap;
}
.nav-links a:hover { color: var(--ink); background: var(--surface-2); }
.nav-links a.active { color: var(--ink); background: var(--surface-2); }

/* ---------------------------------------------------------------- hero */
.hero { position: relative; overflow: hidden; border-bottom: 1px solid var(--border); }
.hero-bg { position: absolute; inset: -60px; z-index: 0; }
.hero-bg img {
  width: 100%; height: 100%; object-fit: cover;
  filter: blur(90px) saturate(1.15);
  opacity: 0.22;
  transform: scale(1.3);
}
.hero-inner {
  position: relative;
  z-index: 1;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 64px 24px 56px;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 36px;
  align-items: center;
}
.hero-cover img {
  width: 220px; height: 220px;
  border-radius: 16px;
  border: 1px solid var(--border);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.55);
  display: block;
  background: var(--surface);
}
.hero h1 { font-size: clamp(26px, 3.6vw, 38px); margin: 2px 0 8px; }
.hero-artist { color: var(--ink-2); margin: 0 0 16px; font-size: 14px; }
.hero-chips { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border: 1px solid var(--border);
  background: rgba(26, 26, 25, 0.7);
  border-radius: 999px;
  padding: 5px 12px;
  font-size: 12.5px;
  color: var(--ink-2);
}
.dot { width: 10px; height: 10px; border-radius: 50%; flex: none; }
.chip small { color: var(--ink-3); }
.hero-stat {
  text-align: right;
  max-width: 300px;
  border-left: 1px solid var(--border);
  padding-left: 32px;
}
.hero-num { font-size: 60px; font-weight: 700; color: var(--ink); letter-spacing: -0.02em; line-height: 1; }
.hero-unit { font-size: 24px; color: var(--ink-3); margin-left: 6px; font-weight: 500; }
.hero-stat-label { font-size: 13px; color: var(--ink-2); margin: 12px 0 6px; }
.hero-stat-sub { font-size: 12px; color: var(--ink-3); margin: 0; }
@media (max-width: 980px) {
  .hero-inner { grid-template-columns: auto 1fr; }
  .hero-stat { grid-column: 1 / -1; text-align: left; border-left: none; padding-left: 0; border-top: 1px solid var(--border); padding-top: 20px; max-width: none; }
}
@media (max-width: 620px) {
  .hero-inner { grid-template-columns: 1fr; gap: 20px; padding: 40px 24px; }
  .hero-cover img { width: 132px; height: 132px; }
}

/* ---------------------------------------------------------------- cards */
.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; margin-top: 18px; }
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 18px 16px;
}
.card .card-kicker { font-size: 11.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--ink-3); font-weight: 600; }
.card .card-stat { font-size: 30px; font-weight: 700; color: var(--ink); margin: 6px 0 2px; letter-spacing: -0.01em; }
.card .card-stat small { font-size: 15px; color: var(--ink-3); font-weight: 500; }
.card p { font-size: 13px; margin: 6px 0 0; color: var(--ink-2); }
.verdict-strip {
  margin: 22px 0 0;
  padding: 14px 18px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 10px;
  background: var(--surface);
  font-size: 14.5px;
}

/* ---------------------------------------------------------------- player */
.seg-tabs { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }
.seg-tab {
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--ink-2);
  border-radius: 10px;
  padding: 8px 14px;
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
  text-align: left;
}
.seg-tab small { display: block; color: var(--ink-3); font-size: 11px; }
.seg-tab.active { border-color: rgba(57, 135, 229, 0.65); background: rgba(57, 135, 229, 0.12); color: var(--ink); }
.variant-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 8px; margin-bottom: 16px; }
@media (max-width: 720px) { .variant-grid { grid-template-columns: repeat(2, 1fr); } }
.variant-btn {
  position: relative;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 6px 8px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--ink-2);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
  transition: border-color 0.15s, background 0.15s;
  overflow: hidden;
  min-width: 0;
}
.variant-btn:hover { border-color: rgba(255, 255, 255, 0.25); }
.variant-btn.active { border-color: var(--vc, var(--accent)); background: color-mix(in srgb, var(--vc, var(--accent)) 13%, var(--surface-2)); color: var(--ink); }
.variant-btn .vname { flex: 1; min-width: 0; text-align: left; line-height: 1.3; overflow: hidden; }
.variant-btn .vname small { display: block; color: var(--ink-3); font-size: 11px; }
.variant-btn .vkey {
  font-size: 10.5px;
  color: var(--ink-3);
  border: 1px solid var(--border);
  border-radius: 5px;
  padding: 0 5px;
  font-family: ui-monospace, Consolas, monospace;
  flex-shrink: 0;
}
.variant-btn .vload {
  position: absolute; right: 8px; top: 8px;
  width: 10px; height: 10px;
  border: 2px solid var(--ink-3);
  border-top-color: transparent;
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  display: none;
}
.variant-btn.loading .vload { display: block; }
.variant-btn.loading .vkey { visibility: hidden; }
@keyframes spin { to { transform: rotate(360deg); } }
.badge {
  font-size: 10px;
  color: var(--ink);
  background: color-mix(in srgb, var(--vc, var(--accent)) 30%, transparent);
  border-radius: 5px;
  padding: 1px 5px;
  white-space: nowrap;
  flex-shrink: 0;
}
.player-row { display: flex; align-items: center; gap: 14px; }
.play-btn {
  width: 52px; height: 52px;
  flex: none;
  border-radius: 50%;
  border: none;
  background: var(--accent);
  color: #fff;
  cursor: pointer;
  display: grid;
  place-items: center;
  transition: transform 0.1s, opacity 0.15s;
}
.play-btn:hover { transform: scale(1.05); }
.play-btn:disabled { opacity: 0.4; cursor: default; transform: none; }
.wave-wrap { flex: 1; min-width: 0; position: relative; }
#wave-canvas { width: 100%; height: 110px; display: block; cursor: pointer; touch-action: none; border-radius: 8px; background: var(--surface-2); }
.time-label { font-size: 12px; color: var(--ink-3); font-variant-numeric: tabular-nums; white-space: nowrap; }
.vol-wrap { display: flex; align-items: center; gap: 8px; color: var(--ink-3); }
input[type="range"] {
  -webkit-appearance: none;
  appearance: none;
  width: 96px; height: 4px;
  background: var(--axis);
  border-radius: 2px;
  outline: none;
}
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--ink);
  cursor: pointer;
  border: none;
}
input[type="range"]::-moz-range-thumb { width: 14px; height: 14px; border-radius: 50%; background: var(--ink); cursor: pointer; border: none; }
@media (max-width: 720px) {
  .player-row { flex-wrap: wrap; }
  .wave-wrap { order: 10; flex-basis: 100%; }
}

/* ---------------------------------------------------------------- abx */
.abx-setup .row { display: flex; flex-wrap: wrap; gap: 18px; margin-bottom: 16px; }
.abx-field label { display: block; font-size: 12px; color: var(--ink-3); margin-bottom: 6px; }
.opt-group { display: flex; gap: 6px; flex-wrap: wrap; }
.opt {
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--ink-2);
  border-radius: 9px;
  padding: 7px 12px;
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
}
.opt.active { border-color: rgba(57, 135, 229, 0.65); background: rgba(57, 135, 229, 0.12); color: var(--ink); }
.btn-primary {
  border: none;
  background: var(--accent);
  color: #fff;
  border-radius: 10px;
  padding: 10px 22px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
}
.btn-primary:hover { filter: brightness(1.1); }
.btn-primary:disabled { opacity: 0.4; cursor: default; }
.btn-ghost {
  border: 1px solid var(--border);
  background: transparent;
  color: var(--ink-2);
  border-radius: 10px;
  padding: 9px 16px;
  font-size: 13px;
  cursor: pointer;
  font-family: inherit;
}
.btn-ghost:hover { border-color: rgba(255, 255, 255, 0.25); color: var(--ink); }
.abx-progress { font-size: 13px; color: var(--ink-3); margin-bottom: 14px; font-variant-numeric: tabular-nums; }
.abx-dots { display: flex; gap: 5px; margin: 8px 0 18px; flex-wrap: wrap; }
.abx-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--surface-2); border: 1px solid var(--border); }
.abx-dot.done { background: var(--accent); border-color: var(--accent); }
.abx-listen { display: flex; gap: 10px; margin-bottom: 18px; flex-wrap: wrap; }
.abx-big {
  flex: 1;
  min-width: 110px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--ink);
  border-radius: 12px;
  padding: 14px;
  cursor: pointer;
  font-family: inherit;
  text-align: center;
}
.abx-big .abx-letter { font-size: 26px; font-weight: 700; display: block; }
.abx-big small { color: var(--ink-3); font-size: 11.5px; }
.abx-big.active { border-color: var(--accent); background: rgba(57, 135, 229, 0.14); }
.abx-big.abx-x .abx-letter { color: var(--accent); }
.abx-answer { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.abx-result-num { font-size: 42px; font-weight: 700; color: var(--ink); }
.abx-result p { margin: 8px 0; }
.p-badge {
  display: inline-block;
  border-radius: 8px;
  padding: 3px 10px;
  font-size: 13px;
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}
.p-badge.sig { background: rgba(12, 163, 12, 0.16); color: #7fd97f; }
.p-badge.nosig { background: var(--surface-2); color: var(--ink-2); border: 1px solid var(--border); }

/* ---------------------------------------------------------------- charts */
.chart-wrap { position: relative; }
.chart-wrap canvas { width: 100%; display: block; touch-action: pan-y; }
.chart-legend { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 12px; }
.legend-chip {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  border: 1px solid var(--border);
  background: var(--surface-2);
  border-radius: 999px;
  padding: 4px 11px;
  font-size: 12.5px;
  color: var(--ink-2);
  cursor: pointer;
  font-family: inherit;
  user-select: none;
}
.legend-chip.off { opacity: 0.35; }
.tip {
  position: absolute;
  z-index: 5;
  pointer-events: none;
  background: rgba(35, 35, 33, 0.96);
  border: 1px solid var(--border);
  border-radius: 9px;
  padding: 8px 11px;
  font-size: 12px;
  line-height: 1.6;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.tip .tip-title { color: var(--ink); font-weight: 600; margin-bottom: 3px; }
.tip .tip-row { display: flex; align-items: center; gap: 7px; }
.tip .tip-row .dot { width: 8px; height: 8px; }
.tip .tip-val { margin-left: auto; padding-left: 14px; color: var(--ink); }

/* ---------------------------------------------------------------- band table */
.table-scroll { overflow-x: auto; }
.band-table { width: 100%; border-collapse: collapse; font-size: 13px; }
.band-table th {
  text-align: right;
  color: var(--ink-3);
  font-weight: 500;
  font-size: 11.5px;
  padding: 6px 10px;
  border-bottom: 1px solid var(--axis);
  white-space: nowrap;
}
.band-table th:first-child, .band-table td:first-child { text-align: left; }
.band-table td {
  padding: 7px 10px;
  border-bottom: 1px solid var(--grid);
  text-align: right;
  font-variant-numeric: tabular-nums;
  color: var(--ink-2);
  white-space: nowrap;
}
.band-table tr:last-child td { border-bottom: none; }
.meter {
  display: inline-block;
  width: 64px; height: 6px;
  background: var(--grid);
  border-radius: 3px;
  margin-left: 8px;
  vertical-align: 2px;
  overflow: hidden;
}
.meter i { display: block; height: 100%; border-radius: 3px; }

/* ---------------------------------------------------------------- spectrogram compare */
.sg-controls { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-bottom: 14px; }
.sg-controls .sel-wrap { display: flex; align-items: center; gap: 6px; font-size: 12.5px; color: var(--ink-3); }
select {
  background: var(--surface-2);
  color: var(--ink);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 10px;
  font-size: 13px;
  font-family: inherit;
}
.sg-presets { display: flex; gap: 6px; flex-wrap: wrap; margin-left: auto; }
.sg-stage {
  position: relative;
  width: 100%;
  aspect-ratio: 2400 / 683;
  border-radius: 10px;
  overflow: hidden;
  background: #000;
  touch-action: none;
  cursor: col-resize;
}
.sg-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: fill; user-select: none; -webkit-user-drag: none; }
.sg-divider {
  position: absolute;
  top: 0; bottom: 0;
  width: 2px;
  background: rgba(255, 255, 255, 0.9);
  box-shadow: 0 0 10px rgba(0, 0, 0, 0.8);
  transform: translateX(-1px);
}
.sg-grip {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 30px; height: 30px;
  border-radius: 50%;
  background: rgba(13, 13, 13, 0.85);
  border: 1px solid rgba(255, 255, 255, 0.7);
  color: #fff;
  display: grid;
  place-items: center;
  font-size: 14px;
}
.sg-tag {
  position: absolute;
  top: 10px;
  font-size: 11.5px;
  color: #fff;
  background: rgba(13, 13, 13, 0.72);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 2px 8px;
  pointer-events: none;
}
.sg-tag-left { left: 10px; }
.sg-tag-right { right: 10px; }
.sg-yaxis {
  position: absolute;
  top: 0; bottom: 0; left: 6px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  font-size: 10px;
  color: rgba(255, 255, 255, 0.65);
  pointer-events: none;
  padding: 2px 0;
  text-shadow: 0 0 4px #000;
}
.sg-xaxis { display: flex; justify-content: space-between; font-size: 11px; color: var(--ink-3); margin-top: 6px; font-variant-numeric: tabular-nums; }

/* ---------------------------------------------------------------- loudness */
.loud-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 14px; margin: 16px 0; }
.loud-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; }
.loud-head { display: flex; align-items: center; gap: 8px; margin-bottom: 4px; color: var(--ink); font-weight: 600; font-size: 14.5px; }
.loud-sub { font-size: 11.5px; color: var(--ink-3); margin: 0 0 12px; }
.loud-rows { display: grid; gap: 7px; }
.loud-row { display: flex; justify-content: space-between; font-size: 13px; border-bottom: 1px solid var(--grid); padding-bottom: 6px; }
.loud-row:last-child { border-bottom: none; }
.loud-row .lv { color: var(--ink); font-variant-numeric: tabular-nums; display: flex; align-items: center; gap: 6px; }
.warn-chip { font-size: 10.5px; color: var(--serious); border: 1px solid color-mix(in srgb, var(--serious) 45%, transparent); border-radius: 5px; padding: 0 5px; }

/* bit depth */
#bits-card .bits-flex { display: flex; gap: 28px; align-items: center; flex-wrap: wrap; }
.bits-stat .card-stat { font-size: 34px; font-weight: 700; color: var(--ink); }
#bits-canvas { width: 260px; height: 76px; }
.bits-copy { flex: 1; min-width: 260px; font-size: 13.5px; }

/* ---------------------------------------------------------------- method */
.method-steps { counter-reset: step; list-style: none; padding: 0; margin: 20px 0; display: grid; gap: 12px; }
.method-steps li {
  counter-increment: step;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 18px 16px 58px;
  position: relative;
  font-size: 13.5px;
}
.method-steps li::before {
  content: counter(step);
  position: absolute;
  left: 18px; top: 16px;
  width: 26px; height: 26px;
  border-radius: 50%;
  background: rgba(57, 135, 229, 0.14);
  border: 1px solid rgba(57, 135, 229, 0.5);
  color: var(--ink);
  display: grid;
  place-items: center;
  font-size: 12.5px;
  font-weight: 600;
}
.method-steps li b { display: block; margin-bottom: 2px; }
.control-callout { border-left: 3px solid var(--c-nh); font-size: 13.5px; }
.control-callout b { color: var(--ink); }

/* ---------------------------------------------------------------- footer / boot */
.footer {
  max-width: var(--maxw);
  margin: 48px auto 0;
  padding: 28px 24px 40px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--ink-3);
  line-height: 2;
}
.boot {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: var(--bg);
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 14px;
  color: var(--ink-3);
  font-size: 13px;
  transition: opacity 0.3s;
}
.boot.hide { opacity: 0; pointer-events: none; }
.boot-spin {
  width: 26px; height: 26px;
  border: 3px solid var(--axis);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.9s linear infinite;
}
.boot.error { color: var(--serious); }

:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001s !important; transition-duration: 0.001s !important; }
}