/* SOUND OS Design System · WebMCP 3-Tone Aqua to Neon & Paper DS Palettes */

:root {
  color-scheme: dark light;
  
  /* Dark Mode Default (3-Tone Aqua to Neon) */
  --bg-canvas: #070B0D;
  --bg-surface: #0E1619;
  --bg-surface-elevated: #142024;
  --border-line: #1C2D32;
  --border-focus: #00D2EE;
  
  --text-ink: #ECF7F7;
  --text-muted: #7E989C;
  --text-dim: #4B6367;
  
  /* 3 Tones */
  --tone-teal: #004552;
  --tone-aqua: #00D2EE;
  --tone-neon: #D4FF00;
  
  --btn-primary-bg: #D4FF00;
  --btn-primary-text: #060B0D;
  --btn-primary-border: #D4FF00;
  
  --font-serif: "Georgia", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: "SF Mono", "Consolas", "Courier New", monospace;
  
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.4);
  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

/* Light Mode: SOUND Paper Design System */
:root[data-theme="light"],
html[data-theme="light"],
body[data-theme="light"] {
  --bg-canvas: #F5F1EA;
  --bg-surface: #FFFFFF;
  --bg-surface-elevated: #EAE4D9;
  --border-line: #D8DED9;
  --border-focus: #007A8F;
  
  --text-ink: #0A0A0A;
  --text-muted: #4B5563;
  --text-dim: #7A8490;
  
  --tone-teal: #003A3A;
  --tone-aqua: #007A8F;
  --tone-neon: #5E8700;
  
  --btn-primary-bg: #003A3A;
  --btn-primary-text: #CFFF04;
  --btn-primary-border: #003A3A;
  
  --shadow-subtle: 0 4px 20px rgba(0, 58, 58, 0.06);
}

/* Dark Mode Explicit Override */
:root[data-theme="dark"],
html[data-theme="dark"],
body[data-theme="dark"] {
  --bg-canvas: #070B0D;
  --bg-surface: #0E1619;
  --bg-surface-elevated: #142024;
  --border-line: #1C2D32;
  --border-focus: #00D2EE;
  
  --text-ink: #ECF7F7;
  --text-muted: #7E989C;
  --text-dim: #4B6367;
  
  --tone-teal: #004552;
  --tone-aqua: #00D2EE;
  --tone-neon: #D4FF00;
  
  --btn-primary-bg: #D4FF00;
  --btn-primary-text: #060B0D;
  --btn-primary-border: #D4FF00;
  
  --shadow-subtle: 0 4px 20px rgba(0, 0, 0, 0.4);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg-canvas: #F5F1EA;
    --bg-surface: #FFFFFF;
    --bg-surface-elevated: #EAE4D9;
    --border-line: #D8DED9;
    --border-focus: #007A8F;
    --text-ink: #0A0A0A;
    --text-muted: #4B5563;
    --text-dim: #7A8490;
    --tone-teal: #003A3A;
    --tone-aqua: #007A8F;
    --tone-neon: #5E8700;
    --btn-primary-bg: #003A3A;
    --btn-primary-text: #CFFF04;
    --btn-primary-border: #003A3A;
    --shadow-subtle: 0 4px 20px rgba(0, 58, 58, 0.06);
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background-color: var(--bg-canvas);
  color: var(--text-ink);
  font-family: var(--font-sans);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
  transition: background-color 0.25s ease, color 0.25s ease;
}

.shell {
  width: min(1120px, calc(100% - 48px));
  margin: 0 auto;
  padding: 48px 0 96px;
}

/* Header & Theme Control */
.header-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border-line);
  padding-bottom: 16px;
  margin-bottom: 32px;
}

.eyebrow {
  color: var(--tone-aqua);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin: 0;
}

.theme-toggle {
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-line);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  transition: var(--transition);
}

.theme-toggle:hover {
  border-color: var(--tone-aqua);
  color: var(--text-ink);
}

h1 {
  max-width: 820px;
  margin: 20px 0 16px;
  font-family: var(--font-serif);
  font-size: clamp(38px, 6.5vw, 76px);
  font-weight: 400;
  line-height: 1.02;
  letter-spacing: -0.035em;
  color: var(--text-ink);
}

.intro {
  max-width: 680px;
  color: var(--text-muted);
  font-size: 17px;
  line-height: 1.6;
  margin: 0 0 28px;
}

/* 3-Pillar Value Proposition Grid */
.principles {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin: 32px 0 24px;
}

.principles-item {
  border: 1px solid var(--border-line);
  background: var(--bg-surface);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  transition: var(--transition);
}

.principles-item:hover {
  border-color: var(--tone-teal);
}

.principles-item .tag {
  color: var(--tone-aqua);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  display: block;
  margin-bottom: 6px;
}

.principles-item p {
  margin: 0;
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.5;
}

.principles-item strong {
  color: var(--text-ink);
}

/* Guide Card / Details */
.guide-card {
  margin: 24px 0 40px;
  border: 1px solid var(--border-line);
  background: var(--bg-surface);
  border-radius: var(--radius-md);
  padding: 16px 20px;
}

.guide-card summary {
  cursor: pointer;
  color: var(--tone-aqua);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  outline: none;
}

.guide-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border-line);
}

.guide-grid h2 {
  margin: 0 0 6px;
  color: var(--tone-aqua);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
}

.guide-grid p,
.guide-example {
  color: var(--text-muted);
  font-size: 13px;
  line-height: 1.5;
  margin: 0;
}

.guide-example {
  border-top: 1px solid var(--border-line);
  margin-top: 18px;
  padding-top: 14px;
}

.guide-example strong {
  color: var(--text-ink);
}

code {
  color: var(--tone-aqua);
  font-family: var(--font-mono);
  background: var(--bg-surface-elevated);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  font-size: 0.9em;
}

/* Two-Column Cockpit Grid */
.grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  margin-top: 36px;
}

.card {
  border: 1px solid var(--border-line);
  background: var(--bg-surface);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-subtle);
  position: relative;
}

.card-label {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  color: var(--tone-aqua);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  border-bottom: 1px solid var(--border-line);
  padding-bottom: 12px;
}

.step-badge {
  background: var(--bg-surface-elevated);
  color: var(--tone-aqua);
  border: 1px solid var(--border-line);
  font-size: 9px;
  padding: 3px 7px;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-weight: 700;
}

/* Input Mode Tabs / Pills */
.input-mode-tabs {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 16px;
}

.tab-btn {
  margin-top: 0 !important;
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-line);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  transition: var(--transition);
}

.tab-btn:hover {
  border-color: var(--tone-aqua);
  color: var(--text-ink);
}

.tab-btn.active {
  background: var(--tone-teal);
  border-color: var(--tone-aqua);
  color: #CFFF04;
}

[data-theme="light"] .tab-btn.active {
  background: var(--tone-teal);
  border-color: var(--tone-teal);
  color: #CFFF04;
}

.input-section {
  margin-top: 12px;
}

/* Textarea Header & Actions */
.textarea-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
}

.textarea-header label {
  margin-top: 0;
}

.textarea-actions {
  display: flex;
  gap: 6px;
}

.mini-btn {
  margin-top: 0 !important;
  padding: 4px 8px !important;
  font-size: 9.5px !important;
  font-family: var(--font-mono);
  border-radius: var(--radius-sm);
  background: var(--bg-surface-elevated);
  border: 1px solid var(--border-line);
  color: var(--text-muted);
  cursor: pointer;
}

.mini-btn:hover {
  border-color: var(--tone-aqua);
  color: var(--text-ink);
}

/* Voice Input Panel */
.voice-panel {
  background: var(--bg-surface-elevated);
  border: 1px dashed var(--tone-aqua);
  border-radius: var(--radius-sm);
  padding: 14px;
  margin-top: 12px;
  text-align: center;
}

.voice-btn {
  margin-top: 0 !important;
  background: var(--tone-teal);
  border: 1px solid var(--tone-aqua);
  color: #CFFF04;
}

.voice-btn.recording {
  background: #E11D48 !important;
  border-color: #FB7185 !important;
  color: #FFFFFF !important;
  animation: pulse 1.5s infinite;
}

@keyframes pulse {
  0% { transform: scale(1); }
  50% { transform: scale(1.03); }
  100% { transform: scale(1); }
}

.voice-status {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  margin-top: 8px;
}

/* TTS Readback Bar */
.tts-row {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--border-line);
}

.tts-status {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--tone-aqua);
}

label {
  display: block;
  color: var(--text-muted);
  font-size: 12.5px;
  font-weight: 600;
  line-height: 1.4;
  margin-top: 16px;
}

textarea,
select,
input[type="file"] {
  display: block;
  width: 100%;
  margin-top: 6px;
  padding: 12px 14px;
  border: 1px solid var(--border-line);
  background: var(--bg-surface-elevated);
  color: var(--text-ink);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  border-radius: var(--radius-sm);
  resize: vertical;
  transition: var(--transition);
}

textarea:focus,
select:focus,
input[type="file"]:focus {
  outline: none;
  border-color: var(--tone-aqua);
}

input[type="file"] {
  padding: 8px 12px;
  font-size: 12px;
  font-family: var(--font-mono);
}

/* Primary & Secondary Buttons */
button {
  margin-top: 20px;
  border: 1px solid var(--btn-primary-border);
  padding: 12px 18px;
  background: var(--btn-primary-bg);
  color: var(--btn-primary-text);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}

button:hover:not(:disabled) {
  transform: translateY(-1px);
  filter: brightness(1.1);
  box-shadow: 0 4px 12px rgba(0, 122, 143, 0.2);
}

button:disabled {
  cursor: not-allowed;
  opacity: 0.35;
  transform: none;
  box-shadow: none;
}

button.secondary {
  border-color: var(--tone-aqua);
  background: transparent;
  color: var(--tone-aqua);
}

button.secondary:hover:not(:disabled) {
  background: var(--bg-surface-elevated);
  box-shadow: 0 4px 12px rgba(0, 122, 143, 0.15);
}

.status,
.file-status {
  min-height: 16px;
  margin: 14px 0 0;
  font-size: 11px;
  font-family: var(--font-mono);
}

.status {
  color: var(--tone-aqua);
}

.file-status {
  color: var(--text-dim);
}

.source-preview {
  margin-top: 10px;
  border: 1px solid var(--border-line);
  background: var(--bg-surface-elevated);
  color: var(--text-muted);
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.5;
  border-radius: var(--radius-sm);
  white-space: pre-wrap;
  max-height: 120px;
  overflow-y: auto;
}

.checkbox-label {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.4;
  margin-top: 14px;
}

.checkbox-label input {
  width: auto;
  margin-top: 2px;
}

/* Profile / Reflection Output */
.empty {
  color: var(--text-dim);
  font-style: italic;
  line-height: 1.6;
  padding: 24px 0;
}

.profile,
#repair {
  line-height: 1.65;
  font-size: 13.5px;
}

.profile strong,
#repair strong {
  color: var(--tone-aqua);
}

.plan-card {
  margin-top: 24px;
}

.approval-row {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-top: 20px;
}

.approval-row button {
  margin-top: 0;
}

.plan {
  padding-left: 20px;
  line-height: 1.7;
  color: var(--text-muted);
  font-size: 13px;
}

.plan li strong {
  color: var(--text-ink);
}

.approval-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.approval-controls button {
  margin-top: 0;
}

.case-summary {
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 11.5px;
  margin-bottom: 20px;
}

.agent-panel {
  margin-top: 28px;
  border-top: 1px solid var(--border-line);
  padding-top: 16px;
  color: var(--text-muted);
}

.agent-panel summary {
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 10.5px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--tone-aqua);
}

pre {
  overflow: auto;
  color: var(--tone-aqua);
  background: var(--bg-surface-elevated);
  padding: 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.55;
  white-space: pre-wrap;
  margin-top: 12px;
}

/* Responsive */
@media (max-width: 800px) {
  .shell {
    width: min(100% - 32px, 600px);
    padding-top: 32px;
  }
  .grid,
  .principles,
  .guide-grid {
    grid-template-columns: 1fr;
  }
  .card {
    padding: 20px;
  }
}