/* ========== CSS Variables & Theme ========== */

:root {
  /* ADH Master Palette */
  --color-apex: #0038A8;
  --color-apex-dark: #001F5E;
  --color-molten: #FF5000;
  --color-carbide: #1B1F24;
  --color-carbide-dark: #2A3038;
  --color-titanium: #8D99AE;
  --color-silver: #F0F2F5;
  --color-silver-text: #E1E4E8;
  --color-coolant: #00D4FF;

  --font-sans: system-ui, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', sans-serif;
  --font-mono: ui-monospace, 'Cascadia Code', 'Source Code Pro', Menlo, Consolas, 'DejaVu Sans Mono',
               'PingFang SC', 'Microsoft YaHei', 'Noto Sans SC', monospace;

  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.2s cubic-bezier(0.55, 0, 0.1, 1);
}

[data-theme="dark"] {
  --bg: var(--color-carbide);
  --bg-surface: rgba(42, 48, 56, 0.6); /* carbide-dark translucent */
  --bg-surface-hover: rgba(255, 255, 255, 0.05);
  --bg-overlay: rgba(27, 31, 36, 0.8); /* carbide translucent */
  --border: rgba(255, 255, 255, 0.1);
  --border-focus: var(--color-coolant); /* data/lines/focus */
  --text-primary: #FFFFFF;
  --text-secondary: rgba(255, 255, 255, 0.6);
  --text-muted: rgba(255, 255, 255, 0.4);
  --accent: var(--color-apex);
  --accent-hover: var(--color-apex-dark);
  --success: #3fb950;
  --warning: var(--color-molten);
  --danger: var(--color-molten);
  --danger-hover: #e04400;
  --progress-bg: rgba(255, 255, 255, 0.1);
  --progress-fill: var(--color-apex);
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.3);
}

[data-theme="light"] {
  --bg: var(--color-silver);
  --bg-surface: rgba(255, 255, 255, 0.8);
  --bg-surface-hover: rgba(0, 0, 0, 0.03);
  --bg-overlay: rgba(240, 242, 245, 0.8); /* silver translucent */
  --border: rgba(0, 0, 0, 0.1);
  --border-focus: var(--color-apex);
  --text-primary: #000000;
  --text-secondary: rgba(0, 0, 0, 0.6);
  --text-muted: rgba(0, 0, 0, 0.4);
  --accent: var(--color-apex);
  --accent-hover: var(--color-apex-dark);
  --success: #1a7f37;
  --warning: var(--color-molten);
  --danger: var(--color-molten);
  --danger-hover: #e04400;
  --progress-bg: rgba(0, 0, 0, 0.1);
  --progress-fill: var(--color-apex);
  --shadow: 0 20px 50px rgba(8, 112, 184, 0.07);
}

/* ========== Reset & Base ========== */

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

[hidden] {
  display: none !important;
}

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  height: 100vh;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* ========== Header ========== */

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 24px;
  border-bottom: 1px solid var(--border);
  background: var(--bg);
  flex-shrink: 0;
  z-index: 10;
}

.header-left {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
}

.tagline {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.header-right {
  display: flex;
  gap: 8px;
}

/* ========== Main Layout ========== */

.main {
  flex: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  overflow: hidden;
}

/* ========== Panels ========== */

.panel {
  overflow-y: auto;
  padding: 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.panel-left {
  border-right: 1px solid var(--border);
}

.panel > .card {
  flex: 1;
  display: flex;
  flex-direction: column;
}

.panel > .card > .textarea {
  flex: 1;
  min-height: 120px;
}

.panel-placeholder {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  gap: 16px;
  font-size: 0.875rem;
}

.panel-right .card:not([hidden]) ~ .panel-placeholder {
  display: none;
}

/* ========== Card ========== */

/* Intentionally transparent — flat panel design, class retained for layout structure */
.card {
  background: transparent;
  border: none;
  border-radius: 0;
  padding: 0;
  box-shadow: none;
  transition: none;
}

.card-title {
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

/* ========== Textarea ========== */

.textarea {
  width: 100%;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  line-height: 1.7;
  padding: 12px 14px;
  tab-size: 4;
  background: var(--bg);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  resize: vertical;
  transition: border-color var(--transition);
}

.textarea:focus {
  outline: none;
  border-color: var(--border-focus);
}

.textarea::placeholder {
  color: var(--text-muted);
}

.textarea-output {
  background: var(--bg);
  cursor: default;
}

/* ========== Input Stats ========== */

.input-stats {
  display: flex;
  gap: 8px;
  align-items: center;
  margin-top: 8px;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.separator {
  color: var(--text-muted);
}

/* ========== Controls ========== */

.controls-row {
  display: flex;
  gap: 20px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.controls-row-bottom {
  align-items: flex-end;
  justify-content: space-between;
}

.control-group {
  display: flex;
  flex-direction: column;
  gap: 6px;
  flex: 1;
  min-width: 180px;
}

.control-group label {
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.target-input-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.unit-label {
  font-size: 0.8rem;
  color: var(--text-secondary);
  white-space: nowrap;
}

.input-number {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  padding: 6px 10px;
  background: var(--bg);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  width: 120px;
  transition: border-color var(--transition);
}

.input-number:focus {
  outline: none;
  border-color: var(--border-focus);
}

.input-small {
  width: 80px;
}

.select {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  padding: 6px 10px;
  background: var(--bg);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color var(--transition);
}

.select:focus {
  outline: none;
  border-color: var(--border-focus);
}

/* ========== Slider ========== */

.slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 4px;
  background: var(--progress-bg);
  border-radius: 2px;
  outline: none;
  margin-top: 4px;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  background: var(--accent);
  border-radius: 50%;
  cursor: pointer;
  transition: background var(--transition);
}

.slider::-webkit-slider-thumb:hover {
  background: var(--accent-hover);
}

.slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  background: var(--accent);
  border-radius: 50%;
  border: none;
  cursor: pointer;
}

/* ========== Ratio Display ========== */

.ratio-display {
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

/* ========== Buttons ========== */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  padding: 8px 24px;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn:hover:not(:disabled) {
  opacity: 0.9;
}

.btn:active:not(:disabled) {
  opacity: 0.8;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn-secondary {
  background: transparent;
  color: var(--text-primary);
  border-color: var(--border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-surface-hover);
}

.btn-danger {
  background: var(--danger);
  color: #fff;
}

.btn-danger:hover:not(:disabled) {
  background: var(--danger-hover);
}

.btn-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: transparent;
  color: var(--text-secondary);
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all var(--transition);
}

.btn-icon:hover {
  background: var(--bg-surface-hover);
  color: var(--text-primary);
}

.btn-icon:active {
  transform: scale(0.95);
}

.action-buttons {
  display: flex;
  gap: 8px;
}

.btn-spinner {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ========== Theme Toggle Icons ========== */

[data-theme="dark"] .icon-sun { display: block; }
[data-theme="dark"] .icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

/* ========== Advanced Panel ========== */

.advanced-panel {
  margin-top: 12px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.advanced-panel summary {
  padding: 10px 14px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  background: var(--bg);
  transition: background var(--transition);
}

.advanced-panel summary:hover {
  background: var(--bg-surface-hover);
}

.advanced-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
  padding: 14px;
  font-size: 0.8rem;
}

.advanced-grid label {
  display: flex;
  align-items: center;
  gap: 6px;
  color: var(--text-secondary);
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  color: var(--text-secondary);
  cursor: pointer;
}

/* ========== Progress ========== */

.progress-bar-container {
  width: 100%;
  height: 4px;
  background: var(--progress-bg);
  border-radius: 2px;
  overflow: hidden;
  margin-bottom: 12px;
}

.progress-bar {
  height: 100%;
  background: var(--progress-fill);
  border-radius: 2px;
  width: 0%;
  transition: width 0.4s ease;
}

.progress-steps {
  display: flex;
  justify-content: space-between;
  margin-bottom: 12px;
}

.step {
  font-size: 0.75rem;
  font-weight: 500;
  color: var(--text-muted);
  text-align: center;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
}

.step.active {
  color: var(--accent);
  background: rgba(88, 166, 255, 0.1);
  animation: stepPulse 1.5s ease-in-out infinite;
}

.step.done {
  color: var(--success);
}

@keyframes stepPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

.progress-message {
  font-size: 0.8rem;
  color: var(--text-secondary);
  min-height: 1.6em;
  margin-top: 6px;
}

.card[data-animate="enter"] {
  animation: cardEnter 0.2s ease forwards;
}

@keyframes cardEnter {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* ========== Output ========== */

.stats-banner {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  padding: 12px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 0.8rem;
}

.stat-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.stat-label {
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.stat-value {
  color: var(--text-primary);
  font-weight: 600;
}

.stat-value.success { color: var(--success); }
.stat-value.warning { color: var(--warning); }
.stat-value.danger { color: var(--danger); }

.output-actions {
  display: flex;
  gap: 8px;
  margin-bottom: 12px;
}

.pre-output {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  line-height: 1.7;
  padding: 14px;
  background: var(--bg);
  color: var(--text-primary);
  border: none;
  white-space: pre-wrap;
  word-break: break-word;
  max-height: 400px;
  overflow-y: auto;
}

/* ========== Modal ========== */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: var(--bg-overlay);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 100;
  padding: 24px;
}

.modal-overlay[hidden] {
  display: none;
}

.modal {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  width: 100%;
  max-width: 440px;
  animation: fadeIn 0.15s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border);
}

.modal-header h3 {
  font-size: 1rem;
  font-weight: 600;
}

.modal-body {
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.modal-footer {
  padding: 16px 24px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: flex-end;
}

.form-label {
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
}

.input-text {
  font-family: var(--font-mono);
  font-size: 0.875rem;
  padding: 8px 12px;
  background: var(--bg);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transition: border-color var(--transition);
}

.input-text:focus {
  outline: none;
  border-color: var(--border-focus);
}

.model-row {
  display: flex;
  gap: 8px;
}

.model-row .select {
  flex: 1;
}

.model-row .input-text {
  flex: 1;
}

/* ========== Toast ========== */

.toast-container {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.toast {
  padding: 10px 16px;
  background: var(--bg-surface);
  color: var(--text-primary);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  font-size: 0.8rem;
  max-width: 360px;
  animation: slideIn 0.2s ease;
}

.toast.error {
  border-color: var(--danger);
  color: var(--danger);
}

.toast.warning {
  border-color: var(--warning);
  color: var(--warning);
}

.toast.success {
  border-color: var(--success);
  color: var(--success);
}

.toast.info {
  border-color: var(--accent);
  color: var(--accent);
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(16px); }
  to { opacity: 1; transform: translateX(0); }
}

/* ========== Quality Report ========== */

.quality-report {
  padding: 14px;
  background: var(--bg);
  font-size: 0.8rem;
  border: none;
}

.quality-placeholder,
.quality-error {
  color: var(--text-secondary);
  font-style: italic;
  margin: 0;
}

.quality-error {
  color: var(--danger);
}

.quality-scores {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 16px;
}

.quality-dim {
  display: grid;
  grid-template-columns: 140px 1fr 40px;
  align-items: center;
  gap: 10px;
}

.quality-dim-label {
  color: var(--text-secondary);
  font-size: 0.75rem;
  white-space: nowrap;
}

.quality-bar-track {
  height: 6px;
  background: var(--progress-bg);
  border-radius: 3px;
  overflow: hidden;
}

.quality-bar-fill {
  height: 100%;
  border-radius: 3px;
  transition: width 0.6s ease;
}

.quality-bar-fill.success { background: var(--success); }
.quality-bar-fill.warning { background: var(--warning); }
.quality-bar-fill.danger { background: var(--danger); }

.quality-dim-score {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-primary);
  text-align: right;
  font-weight: 600;
}

.quality-weakest {
  margin-bottom: 12px;
  color: var(--text-secondary);
}

.quality-weakest strong {
  color: var(--warning);
}

.quality-issues,
.quality-warnings,
.quality-fixes {
  margin-top: 14px;
}

.quality-issues h4,
.quality-warnings h4,
.quality-fixes h4 {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.quality-issues ul,
.quality-warnings ul,
.quality-fixes ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.quality-warnings li {
  padding: 8px 10px;
  border: 1px dashed var(--warning);
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
  color: var(--text-secondary);
}

.quality-issues li {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 8px 10px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-surface);
}

.issue-section {
  font-family: var(--font-mono);
  color: var(--accent);
  font-size: 0.75rem;
}

.issue-problem {
  color: var(--text-primary);
}

.issue-suggestion {
  color: var(--text-secondary);
  font-style: italic;
  font-size: 0.75rem;
}

.quality-fixes li {
  display: flex;
  gap: 8px;
  padding: 4px 0;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.quality-fixes li.fix-success { color: var(--success); }
.quality-fixes li.fix-danger { color: var(--danger); }
.quality-fixes li.fix-muted { color: var(--text-muted); }

/* ========== Responsive ========== */

@media (max-width: 768px) {
  body {
    height: auto;
    overflow: auto;
  }

  .header {
    padding: 12px 16px;
    position: sticky;
    top: 0;
  }

  .tagline {
    display: none;
  }

  .main {
    grid-template-columns: 1fr;
    overflow: visible;
  }

  .panel {
    overflow-y: visible;
  }

  .panel-left {
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .panel > .card {
    flex: none;
  }

  .panel > .card > .textarea {
    flex: none;
  }

  .controls-row {
    flex-direction: column;
    gap: 12px;
  }

  .control-group {
    min-width: 0;
  }

  .action-buttons {
    width: 100%;
  }

  .action-buttons .btn {
    flex: 1;
  }

  .advanced-grid {
    grid-template-columns: 1fr;
  }

  .stats-banner {
    flex-direction: column;
    gap: 8px;
  }
}