/* ==========================================================================
   Corodomo — Modern AI Language Shadowing & Video Phonetic Studio
   Visual System: Crisp Slate Surfaces, Emerald & Indigo Accents, Smooth Elevation
   ========================================================================== */

:root,
[data-theme="light"] {
  --bg-canvas: #F8FAFC;
  --bg-surface: #FFFFFF;
  --bg-rail: #FFFFFF;
  --bg-subtle: #F1F5F9;
  --bg-elevated: #FFFFFF;
  --bg-glass: rgba(255, 255, 255, 0.86);
  --ink-primary: #0F172A;
  --ink-secondary: #475569;
  --ink-muted: #64748B;
  --border-hairline: #E2E8F0;
  --border-strong: #CBD5E1;

  /* Primary Emerald & Secondary Indigo Accents (Corodomo Signature) */
  --accent-vermilion: #10B981;
  --accent-vermilion-hover: #059669;
  --accent-vermilion-soft: #ECFDF5;
  --accent-emerald: #10B981;
  --accent-emerald-dark: #059669;
  --accent-emerald-soft: #ECFDF5;
  --accent-indigo: #4F46E5;
  --accent-indigo-hover: #4338CA;
  --accent-indigo-soft: #EEF2FF;
  --accent-rose: #F43F5E;
  --accent-rose-soft: #FFF1F2;

  /* Semantic Score Tokens */
  --score-high: #059669;
  --score-high-soft: #ECFDF5;
  --score-mid: #D97706;
  --score-mid-soft: #FFFBEB;
  --score-low: #E11D48;
  --score-low-soft: #FFF1F2;

  /* Elevation Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.04);
  --shadow-card: 0 4px 20px -2px rgba(15, 23, 42, 0.05), 0 1px 3px 0 rgba(15, 23, 42, 0.03);
  --shadow-hover: 0 14px 30px -4px rgba(15, 23, 42, 0.1), 0 4px 10px -2px rgba(16, 185, 129, 0.08);
  --shadow-glow: 0 8px 22px -4px rgba(16, 185, 129, 0.38);
  --shadow-indigo-glow: 0 8px 22px -4px rgba(79, 70, 229, 0.32);

  --selection-bg: #D1FAE5;
  --selection-ink: #064E3B;
  --scrollbar-thumb: #CBD5E1;
  --scrollbar-track: #F1F5F9;
}

[data-theme="dark"] {
  --bg-canvas: #0B0F19;
  --bg-surface: #111827;
  --bg-rail: #0F172A;
  --bg-subtle: #1E293B;
  --bg-elevated: #1E293B;
  --bg-glass: rgba(15, 23, 42, 0.84);
  --ink-primary: #F8FAFC;
  --ink-secondary: #94A3B8;
  --ink-muted: #64748B;
  --border-hairline: #1E293B;
  --border-strong: #334155;

  --accent-vermilion: #10B981;
  --accent-vermilion-hover: #34D399;
  --accent-vermilion-soft: rgba(16, 185, 129, 0.14);
  --accent-emerald: #10B981;
  --accent-emerald-dark: #059669;
  --accent-emerald-soft: rgba(16, 185, 129, 0.14);
  --accent-indigo: #818CF8;
  --accent-indigo-hover: #A5B4FC;
  --accent-indigo-soft: rgba(99, 102, 241, 0.16);
  --accent-rose: #FB7185;
  --accent-rose-soft: rgba(244, 63, 94, 0.16);

  --score-high: #34D399;
  --score-high-soft: rgba(16, 185, 129, 0.15);
  --score-mid: #FBBF24;
  --score-mid-soft: rgba(245, 158, 11, 0.15);
  --score-low: #FB7185;
  --score-low-soft: rgba(244, 63, 94, 0.15);

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-card: 0 8px 26px -4px rgba(0, 0, 0, 0.4), 0 2px 6px 0 rgba(0, 0, 0, 0.25);
  --shadow-hover: 0 18px 36px -6px rgba(0, 0, 0, 0.55), 0 0 18px 0 rgba(16, 185, 129, 0.14);
  --shadow-glow: 0 8px 25px -4px rgba(16, 185, 129, 0.45);
  --shadow-indigo-glow: 0 8px 25px -4px rgba(99, 102, 241, 0.4);

  --selection-bg: rgba(16, 185, 129, 0.28);
  --selection-ink: #F8FAFC;
  --scrollbar-thumb: #334155;
  --scrollbar-track: #0F172A;
}

::selection {
  background-color: var(--selection-bg);
  color: var(--selection-ink);
}

html,
body {
  margin: 0;
  padding: 0;
  background-color: var(--bg-canvas);
  color: var(--ink-primary);
  font-family: "Plus Jakarta Sans", "Noto Sans JP", -apple-system, BlinkMacSystemFont, sans-serif;
  font-size: 16px;
  line-height: 1.55;
  caret-color: var(--accent-emerald);
  -webkit-font-smoothing: antialiased;
  text-underline-offset: 0.22em;
}

/* Custom scrollbars */
::-webkit-scrollbar {
  width: 7px;
  height: 7px;
}
::-webkit-scrollbar-track {
  background: var(--scrollbar-track);
}
::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 999px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--ink-muted);
}

:focus-visible {
  outline: 2px solid var(--accent-emerald);
  outline-offset: 2px;
}

.tabular-nums {
  font-family: "JetBrains Mono", ui-monospace, SFMono-Regular, monospace;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.01em;
}

/* Japanese Ruby & Furigana typography */
ruby {
  ruby-align: center;
  ruby-position: over;
  margin: 0 1.5px;
}

ruby rt {
  font-size: 0.58em;
  font-weight: 600;
  color: var(--accent-indigo);
  line-height: 1.15;
  letter-spacing: 0.01em;
  user-select: none;
}

/* App Shell Layout: Sleek Left Sidebar + Top Header + Main Canvas */
.studio-shell {
  display: grid;
  grid-template-columns: 260px minmax(0, 1fr);
  min-height: 100dvh;
  background-color: var(--bg-canvas);
}

@media (max-width: 1024px) {
  .studio-shell {
    grid-template-columns: 1fr;
  }
}

.studio-rail {
  background-color: var(--bg-rail);
  border-right: 1px solid var(--border-hairline);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 22px 18px;
  position: sticky;
  top: 0;
  height: 100dvh;
  box-sizing: border-box;
  z-index: 30;
  box-shadow: var(--shadow-sm);
}

@media (max-width: 1024px) {
  .studio-rail {
    position: static;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--border-hairline);
    padding: 14px 16px;
  }
}

/* Sticky Top Navigation Bar inside Main Canvas */
.corodomo-topbar {
  position: sticky;
  top: 0;
  z-index: 25;
  background-color: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-hairline);
}

/* Elevated Cards & Surfaces */
.studio-sheet {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: 16px;
  box-shadow: var(--shadow-card);
  transition: border-color 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.studio-well {
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-hairline);
  border-radius: 14px;
}

/* Video Card Hover Effects */
.video-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-hairline);
  border-radius: 16px;
  box-shadow: var(--shadow-card);
  overflow: hidden;
  cursor: pointer;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform 220ms cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 220ms cubic-bezier(0.22, 1, 0.36, 1),
              border-color 200ms ease;
}

.video-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: var(--accent-emerald);
}

.video-card .thumb-img {
  transition: transform 360ms cubic-bezier(0.22, 1, 0.36, 1);
}

.video-card:hover .thumb-img {
  transform: scale(1.05);
}

.video-card .play-overlay {
  opacity: 0;
  transform: scale(0.88);
  transition: opacity 200ms ease, transform 220ms cubic-bezier(0.22, 1, 0.36, 1);
}

.video-card:hover .play-overlay {
  opacity: 1;
  transform: scale(1);
}

/* Hero Featured Card */
.hero-showcase {
  background: linear-gradient(
    135deg,
    var(--bg-surface) 0%,
    var(--accent-emerald-soft) 55%,
    var(--accent-indigo-soft) 100%
  );
  border: 1px solid var(--border-strong);
  border-radius: 20px;
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: box-shadow 220ms ease, border-color 220ms ease;
}
.hero-showcase:hover {
  box-shadow: var(--shadow-hover);
  border-color: var(--accent-emerald);
}

/* Primary Action Button (Corodomo Emerald Gradient) */
.btn-vermilion {
  background: linear-gradient(135deg, #10B981 0%, #059669 100%);
  color: #FFFFFF;
  border: 1px solid #059669;
  border-radius: 12px;
  padding: 9px 18px;
  font-size: 0.84375rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  box-shadow: var(--shadow-glow);
  transition: all 160ms ease-out;
}
.btn-vermilion:hover:not(:disabled) {
  background: linear-gradient(135deg, #059669 0%, #047857 100%);
  transform: translateY(-1px);
  box-shadow: 0 10px 25px -4px rgba(16, 185, 129, 0.5);
}
.btn-vermilion:active:not(:disabled) {
  transform: translateY(0);
}
.btn-vermilion:disabled {
  opacity: 0.5;
  cursor: not-allowed;
  box-shadow: none;
}

/* Recording State Button (Rose Pulse) */
.btn-recording {
  background: linear-gradient(135deg, #F43F5E 0%, #E11D48 100%) !important;
  border-color: #E11D48 !important;
  box-shadow: 0 0 0 0 rgba(244, 63, 94, 0.5);
  animation: pulse-record 1.6s infinite;
}

@keyframes pulse-record {
  0% {
    box-shadow: 0 0 0 0 rgba(244, 63, 94, 0.55);
  }
  70% {
    box-shadow: 0 0 0 12px rgba(244, 63, 94, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(244, 63, 94, 0);
  }
}

.btn-ink {
  background-color: var(--bg-surface);
  color: var(--ink-primary);
  border: 1px solid var(--border-hairline);
  border-radius: 11px;
  padding: 8px 14px;
  font-size: 0.8125rem;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: all 150ms ease-out;
}
.btn-ink:hover:not(:disabled) {
  background-color: var(--bg-subtle);
  border-color: var(--border-strong);
  transform: translateY(-1px);
}
.btn-ink[data-active="true"] {
  background-color: var(--accent-indigo-soft);
  color: var(--accent-indigo);
  border-color: var(--accent-indigo);
  font-weight: 700;
}

/* Segmented Pill Group */
.pill-group {
  display: inline-flex;
  background-color: var(--bg-subtle);
  border: 1px solid var(--border-hairline);
  border-radius: 12px;
  padding: 3px;
  gap: 2px;
}
.pill-item {
  border: none;
  background: transparent;
  color: var(--ink-secondary);
  font-size: 0.78125rem;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 9px;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 5px;
  transition: all 150ms ease-out;
}
.pill-item:hover:not([data-active="true"]) {
  color: var(--ink-primary);
}
.pill-item[data-active="true"] {
  background-color: var(--bg-surface);
  color: var(--accent-emerald);
  box-shadow: 0 1px 3px rgba(15, 23, 42, 0.1);
  font-weight: 700;
}

/* Script Row in Video Studio */
.script-row {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border-hairline);
  border-left: 4px solid transparent;
  cursor: pointer;
  transition: background-color 140ms ease-out, border-color 140ms ease-out;
}
.script-row:last-child {
  border-bottom: none;
}
.script-row:hover {
  background-color: var(--bg-subtle);
}
.script-row[data-active="true"] {
  background-color: var(--accent-emerald-soft);
  border-left-color: var(--accent-emerald);
}

/* Clickable Word Token in Active Phonetic Deck */
.word-token {
  display: inline-block;
  padding: 2px 6px;
  margin: 1px 1.5px;
  border-radius: 8px;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 130ms ease-out;
}
.word-token:hover {
  background-color: var(--accent-indigo-soft);
  color: var(--accent-indigo);
  border-color: var(--accent-indigo);
  transform: translateY(-1px);
}

/* Acoustic Oscilloscope Waveform Bars */
.waveform-ribbon {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 3.5px;
  height: 42px;
  padding: 0 12px;
}
.waveform-bar {
  width: 3.5px;
  border-radius: 999px;
  background-color: var(--border-strong);
  transition: height 85ms ease-out, background-color 120ms ease-out;
}
.waveform-ribbon[data-recording="true"] .waveform-bar {
  background: linear-gradient(180deg, #F43F5E 0%, #10B981 100%);
}

/* Semantic Score Badges */
.score-pill-high {
  color: var(--score-high);
  background-color: var(--score-high-soft);
  border: 1px solid var(--score-high);
}
.score-pill-mid {
  color: var(--score-mid);
  background-color: var(--score-mid-soft);
  border: 1px solid var(--score-mid);
}
.score-pill-low {
  color: var(--score-low);
  background-color: var(--score-low-soft);
  border: 1px solid var(--score-low);
}

.score-ink-high { color: var(--score-high); }
.score-ink-mid { color: var(--score-mid); }
.score-ink-low { color: var(--score-low); }

/* Visual Mindmap Tree */
.mindmap-tree {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.mindmap-branch {
  position: relative;
  padding-left: 18px;
  border-left: 3px solid var(--accent-indigo);
}

.d-icon {
  flex-shrink: 0;
  vertical-align: middle;
}