/* ===========================
   Conteranto Demo — Styles
   Design system matched to main site
   =========================== */

/* --- Design Tokens (from base.css) --- */
:root {
  --primary-color: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #3b82f6;
  --primary-lighter: #60a5fa;
  --secondary-color: #0284c7;
  --secondary-dark: #0369a1;
  --accent-color: #10b981;
  --accent-dark: #059669;
  --purple: #8b5cf6;

  --bg-dark: #0f172a;
  --bg-darker: #020617;
  --bg-light: #f8fafc;
  --bg-lighter: #ffffff;
  --bg-muted: #f1f5f9;

  --text-dark: #1e293b;
  --text-light: #f1f5f9;
  --text-muted: #64748b;
  --text-muted-light: #cbd5e1;

  --gradient-primary: linear-gradient(135deg, #2563eb 0%, #1d4ed8 50%, #0284c7 100%);

  --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-heading: 'Space Grotesk', var(--font-primary);

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;

  --radius-sm: 0.5rem;
  --radius-md: 1rem;
  --radius-lg: 2rem;
  --radius-full: 9999px;

  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;

  /* Representation colors */
  --rep-high: #22c55e;
  --rep-medium: #eab308;
  --rep-low: #f97316;
  --rep-very-low: #ef4444;
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

body {
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: 1.6;
  color: var(--text-dark);
  background: var(--bg-light);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* --- Header --- */
.demo-header {
  background: var(--bg-darker);
  color: var(--text-light);
  padding: 0.75rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-md);
}

.demo-header .brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.brand-link {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
}

.brand-icon {
  width: 28px;
  height: 28px;
}

.demo-header .brand h1 {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 700;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.demo-header .brand .badge {
  font-size: var(--text-xs);
  background: var(--accent-color);
  color: white;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
  font-weight: 600;
  letter-spacing: 0.05em;
}

.header-nav {
  display: flex;
  gap: 1.25rem;
}

.header-link {
  color: var(--text-muted-light);
  font-size: var(--text-sm);
  text-decoration: none;
  transition: var(--transition-fast);
}

.header-link:hover {
  color: var(--text-light);
}

/* --- Intro --- */
.demo-intro {
  background: var(--bg-darker);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  padding: 0 1.5rem 1rem;
}

.intro-content {
  max-width: 1400px;
  margin: 0 auto;
}

.intro-content p {
  color: var(--text-muted-light);
  font-size: var(--text-sm);
  line-height: 1.6;
  margin: 0;
}

.intro-content strong {
  color: var(--text-light);
  font-weight: 600;
}

/* --- Usage steps --- */
.usage-steps {
  display: flex;
  gap: 1.5rem;
  margin-top: 0.6rem;
  flex-wrap: wrap;
}

.step {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  font-size: var(--text-xs);
  color: var(--text-muted-light);
}

.step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: rgba(37, 99, 235, 0.3);
  color: var(--primary-lighter);
  font-size: 0.65rem;
  font-weight: 700;
  flex-shrink: 0;
}

/* --- Main layout --- */
.demo-main {
  flex: 1;
  max-width: 1400px;
  margin: 0 auto;
  padding: 1.5rem;
  width: 100%;
  display: grid;
  grid-template-columns: 1fr 1fr;
  grid-template-rows: auto auto 1fr;
  gap: 1.5rem;
  grid-template-areas:
    "input dimensions"
    "output output"
    "insights insights";
}

/* --- Panels --- */
.input-panel {
  grid-area: input;
}

.panel {
  background: var(--bg-lighter);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: var(--shadow-md);
  border: 1px solid #e2e8f0;
}

.panel-title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: 1rem;
  color: var(--text-dark);
}

/* --- Language selectors --- */
.language-row {
  display: flex;
  align-items: flex-end;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}

.lang-select-wrap {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.lang-label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.language-row select {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-sm);
  font-family: var(--font-primary);
  font-size: var(--text-sm);
  background: var(--bg-lighter);
  color: var(--text-dark);
  cursor: pointer;
  transition: var(--transition-fast);
}

.language-row select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.swap-btn {
  width: 36px;
  height: 36px;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-sm);
  background: var(--bg-lighter);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-lg);
  transition: var(--transition-fast);
  flex-shrink: 0;
  margin-bottom: 1px;
}

.swap-btn:hover {
  background: var(--bg-muted);
  border-color: var(--primary-color);
}

/* --- Representation Legend --- */
.rep-legend {
  padding: 0.6rem 0.75rem;
  background: var(--bg-muted);
  border-radius: var(--radius-sm);
  margin-bottom: 1rem;
  font-size: var(--text-xs);
  color: var(--text-muted);
}

.rep-legend-top {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: 0.4rem;
}

.rep-legend-title {
  font-weight: 600;
  color: var(--text-dark);
  font-size: var(--text-xs);
}

.rep-legend-dots {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.rep-legend-dots > span {
  display: flex;
  align-items: center;
  gap: 0.3rem;
}

.rep-dot {
  display: inline-block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  flex-shrink: 0;
}

.rep-dot.rep-high { background-color: var(--rep-high); }
.rep-dot.rep-medium { background-color: var(--rep-medium); }
.rep-dot.rep-low { background-color: var(--rep-low); }
.rep-dot.rep-very-low { background-color: var(--rep-very-low); }

/* --- Textarea --- */
.source-text-input {
  width: 100%;
  min-height: 120px;
  padding: 0.75rem;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-sm);
  font-family: var(--font-primary);
  font-size: var(--text-base);
  line-height: 1.6;
  resize: vertical;
  transition: var(--transition-fast);
  color: var(--text-dark);
}

.source-text-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.char-count {
  text-align: right;
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* --- Example phrases --- */
.examples-section {
  margin-top: 1rem;
}

.examples-label {
  font-size: var(--text-xs);
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  margin-bottom: 0.5rem;
}

.example-pills {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.example-pill {
  padding: 0.3rem 0.7rem;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-full);
  background: var(--bg-lighter);
  font-size: var(--text-xs);
  font-family: var(--font-primary);
  color: var(--text-muted);
  cursor: pointer;
  transition: var(--transition-fast);
  white-space: nowrap;
}

.example-pill:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
}

.example-pill.active {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

/* --- Dimensions Panel --- */
.dimensions-panel {
  grid-area: dimensions;
}

.dimension-slider {
  margin-bottom: 1.25rem;
}

.dimension-slider:last-child {
  margin-bottom: 0;
}

.slider-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.35rem;
}

/* --- Context selector --- */
.context-selector {
  margin-bottom: 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.context-label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.context-selector select {
  width: 100%;
  padding: 0.55rem 0.75rem;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-sm);
  font-family: var(--font-primary);
  font-size: var(--text-sm);
  background: var(--bg-lighter);
  color: var(--text-dark);
  cursor: pointer;
  transition: var(--transition-fast);
}

.context-selector select:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.defaults-note {
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-top: -0.5rem;
  margin-bottom: 1rem;
}

.defaults-note a {
  color: var(--primary-color);
  text-decoration: none;
}

.defaults-note a:hover {
  text-decoration: underline;
}

.slider-name {
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--text-dark);
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

/* --- Info tooltip button --- */
.info-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  border: 1px solid #cbd5e1;
  background: none;
  color: var(--text-muted);
  font-size: 0.6rem;
  font-weight: 700;
  font-family: var(--font-primary);
  cursor: pointer;
  position: relative;
  transition: var(--transition-fast);
  flex-shrink: 0;
  line-height: 1;
}

.info-btn:hover {
  border-color: var(--primary-color);
  color: var(--primary-color);
  background: rgba(37, 99, 235, 0.05);
}

.info-btn::after {
  content: attr(data-tooltip);
  position: absolute;
  left: 50%;
  bottom: calc(100% + 8px);
  transform: translateX(-50%);
  background: var(--bg-darker);
  color: var(--text-light);
  font-size: var(--text-xs);
  font-weight: 400;
  line-height: 1.5;
  padding: 0.6rem 0.75rem;
  border-radius: var(--radius-sm);
  width: 260px;
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
  pointer-events: none;
  z-index: 50;
}

.info-btn::before {
  content: '';
  position: absolute;
  left: 50%;
  bottom: calc(100% + 2px);
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--bg-darker);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
  pointer-events: none;
  z-index: 50;
}

.info-btn:hover::after,
.info-btn:focus::after,
.info-btn:hover::before,
.info-btn:focus::before {
  opacity: 1;
  visibility: visible;
}

.slider-value {
  font-size: var(--text-sm);
  font-weight: 700;
  min-width: 2rem;
  text-align: right;
}

/* Per-dimension value colors */
.dimension-slider[data-dimension="politeness"] .slider-value { color: var(--primary-color); }
.dimension-slider[data-dimension="directness"] .slider-value { color: var(--secondary-color); }
.dimension-slider[data-dimension="formality"] .slider-value { color: var(--accent-color); }
.dimension-slider[data-dimension="attribution"] .slider-value { color: var(--purple); }

.slider-track {
  position: relative;
  width: 100%;
}

.slider-track input[type="range"] {
  width: 100%;
  height: 6px;
  -webkit-appearance: none;
  appearance: none;
  border-radius: 3px;
  outline: none;
  cursor: pointer;
}

.slider-track input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary-color);
  border: 2px solid white;
  box-shadow: var(--shadow-md);
  cursor: pointer;
  transition: var(--transition-fast);
}

.slider-track input[type="range"]::-webkit-slider-thumb:hover {
  transform: scale(1.15);
}

.slider-track input[type="range"]::-moz-range-thumb {
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--primary-color);
  border: 2px solid white;
  box-shadow: var(--shadow-md);
  cursor: pointer;
}

/* Individual slider colors */
.dimension-slider[data-dimension="politeness"] input[type="range"] {
  background: linear-gradient(to right, #dbeafe, #2563eb);
}
.dimension-slider[data-dimension="directness"] input[type="range"] {
  background: linear-gradient(to right, #e0f2fe, #0284c7);
}
.dimension-slider[data-dimension="formality"] input[type="range"] {
  background: linear-gradient(to right, #d1fae5, #10b981);
}
.dimension-slider[data-dimension="attribution"] input[type="range"] {
  background: linear-gradient(to right, #ede9fe, #8b5cf6);
}

/* Per-dimension thumb colors */
.dimension-slider[data-dimension="directness"] input[type="range"]::-webkit-slider-thumb { background: var(--secondary-color); }
.dimension-slider[data-dimension="formality"] input[type="range"]::-webkit-slider-thumb { background: var(--accent-color); }
.dimension-slider[data-dimension="attribution"] input[type="range"]::-webkit-slider-thumb { background: var(--purple); }
.dimension-slider[data-dimension="directness"] input[type="range"]::-moz-range-thumb { background: var(--secondary-color); }
.dimension-slider[data-dimension="formality"] input[type="range"]::-moz-range-thumb { background: var(--accent-color); }
.dimension-slider[data-dimension="attribution"] input[type="range"]::-moz-range-thumb { background: var(--purple); }

.slider-labels {
  display: flex;
  justify-content: space-between;
  margin-top: 0.2rem;
}

.label-low, .label-high {
  font-size: var(--text-xs);
  color: var(--text-muted);
  transition: var(--transition-fast);
}

/* --- Translate Button --- */
.translate-btn {
  width: 100%;
  padding: 0.85rem 1.5rem;
  background: var(--gradient-primary);
  color: white;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-size: var(--text-base);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition-base);
  margin-top: 1.25rem;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
}

.translate-btn:hover:not(:disabled) {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lg);
}

.translate-btn:disabled {
  opacity: 0.7;
  cursor: not-allowed;
}

.translate-hint {
  text-align: center;
  font-size: var(--text-xs);
  color: var(--text-muted);
  margin-top: 0.4rem;
  opacity: 0.7;
}

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-top-color: white;
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
}

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

/* --- Error Message --- */
.error-message {
  background: #fef2f2;
  color: #dc2626;
  padding: 0.75rem 1rem;
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  border: 1px solid #fecaca;
  display: none;
  margin-top: 1rem;
}

.error-message.visible {
  display: block;
}

/* --- Output Panel --- */
.output-panel {
  grid-area: output;
}

.translation-comparison {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.5rem;
}

.translation-column h4 {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
  font-weight: 600;
}

.translation-text {
  padding: 1rem;
  background: var(--bg-muted);
  border-radius: var(--radius-sm);
  min-height: 80px;
  font-size: var(--text-base);
  line-height: 1.8;
  color: var(--text-dark);
  border: 1px solid #e2e8f0;
}

.translation-text.placeholder-text {
  color: var(--text-muted);
  font-style: italic;
  font-size: var(--text-sm);
}

.translation-column.cultural .translation-text {
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.04), rgba(16, 185, 129, 0.04));
  border-color: var(--primary-lighter);
}

.target-lang-label {
  font-size: var(--text-xs);
  color: var(--primary-color);
  font-weight: 600;
  margin-left: 0.5rem;
}

/* --- Back-translation --- */
.back-translation {
  margin-top: 1.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid #e2e8f0;
}

.back-translation-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.back-translation-header h4 {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 0;
}

.back-lang-select {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.back-lang-select label {
  font-size: var(--text-xs);
  color: var(--text-muted);
  font-weight: 600;
  white-space: nowrap;
}

.back-lang-select select {
  padding: 0.35rem 0.5rem;
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-sm);
  font-family: var(--font-primary);
  font-size: var(--text-xs);
  background: var(--bg-lighter);
  color: var(--text-dark);
  cursor: pointer;
}

.back-text {
  font-size: var(--text-sm);
  color: var(--text-muted);
  min-height: 60px;
  font-style: italic;
}

.back-text.has-result {
  font-style: normal;
  color: var(--text-dark);
}

.back-placeholder {
  color: var(--text-muted);
  font-style: italic;
}

.back-translate-btn {
  margin-top: 0.75rem;
  padding: 0.5rem 1.25rem;
  background: var(--bg-muted);
  color: var(--text-dark);
  border: 1px solid #e2e8f0;
  border-radius: var(--radius-sm);
  font-family: var(--font-primary);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition-fast);
}

.back-translate-btn:hover:not(:disabled) {
  background: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
}

.back-translate-btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* --- Loading Skeleton --- */
.loading-skeleton {
  display: none;
}

.loading-skeleton.active {
  display: block;
}

.skeleton-line {
  height: 1rem;
  background: linear-gradient(90deg, #e2e8f0 25%, #f1f5f9 50%, #e2e8f0 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: 4px;
  margin-bottom: 0.5rem;
}

.skeleton-line:nth-child(2) { width: 85%; }
.skeleton-line:nth-child(3) { width: 70%; }

@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* --- Insights Panel --- */
.insights-panel {
  grid-area: insights;
}

.cultural-summary {
  padding: 1rem;
  background: linear-gradient(135deg, rgba(37, 99, 235, 0.06), rgba(16, 185, 129, 0.06));
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--text-dark);
  margin-bottom: 1rem;
  border-left: 3px solid var(--primary-color);
  min-height: 2rem;
}

.cultural-summary.placeholder-text {
  color: var(--text-muted);
  font-style: italic;
}

.explanation-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.explanation-card {
  padding: 1rem;
  background: var(--bg-lighter);
  border-radius: var(--radius-sm);
  border: 1px solid #e2e8f0;
  border-left: 3px solid var(--primary-color);
  transition: var(--transition-fast);
}

.explanation-card:hover {
  box-shadow: var(--shadow-md);
}

.explanation-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.explanation-dimension {
  font-weight: 600;
  font-size: var(--text-sm);
  color: var(--text-dark);
}

.explanation-value {
  margin-left: auto;
  font-size: var(--text-xs);
  font-weight: 700;
  padding: 0.15rem 0.5rem;
  border-radius: var(--radius-full);
}

/* Per-dimension explanation value styling */
.explanation-card[data-dimension="politeness"] { border-left-color: var(--primary-color); }
.explanation-card[data-dimension="directness"] { border-left-color: var(--secondary-color); }
.explanation-card[data-dimension="formality"] { border-left-color: var(--accent-color); }
.explanation-card[data-dimension="attribution"] { border-left-color: var(--purple); }

.explanation-card[data-dimension="politeness"] .explanation-value { color: var(--primary-color); background: rgba(37, 99, 235, 0.08); }
.explanation-card[data-dimension="directness"] .explanation-value { color: var(--secondary-color); background: rgba(2, 132, 199, 0.08); }
.explanation-card[data-dimension="formality"] .explanation-value { color: var(--accent-dark); background: rgba(16, 185, 129, 0.08); }
.explanation-card[data-dimension="attribution"] .explanation-value { color: var(--purple); background: rgba(139, 92, 246, 0.08); }

.explanation-effect {
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--text-muted);
}

/* --- Footer --- */
.demo-footer {
  background: var(--bg-darker);
  color: var(--text-muted-light);
  padding: 1rem 1.5rem;
  text-align: center;
  font-size: var(--text-xs);
  margin-top: auto;
}

.demo-footer a {
  color: var(--primary-lighter);
  text-decoration: none;
}

.demo-footer a:hover {
  text-decoration: underline;
}

/* --- PWA standalone mode --- */
@media (display-mode: standalone) {
  .demo-header {
    padding-top: calc(env(safe-area-inset-top, 0px) + 0.5rem);
  }
  .demo-footer {
    padding-bottom: calc(env(safe-area-inset-bottom, 0px) + 0.75rem);
  }
  body {
    padding-left: env(safe-area-inset-left, 0px);
    padding-right: env(safe-area-inset-right, 0px);
  }
}

/* --- Responsive: Tablet --- */
@media (max-width: 1024px) {
  .demo-main {
    grid-template-columns: 1fr;
    grid-template-areas:
      "input"
      "dimensions"
      "output"
      "insights";
  }
}

/* --- Responsive: Small tablet / large phone --- */
@media (max-width: 768px) {
  .demo-main {
    padding: 0.75rem;
    gap: 0.75rem;
  }

  .panel {
    border-radius: var(--radius-sm);
    padding: 1rem;
  }

  .translation-comparison {
    grid-template-columns: 1fr;
  }

  .explanation-cards {
    grid-template-columns: 1fr;
  }

  .demo-header {
    padding: 0.5rem 0.75rem;
  }

  .demo-header .brand h1 {
    font-size: var(--text-lg);
  }

  .header-nav {
    gap: 0.75rem;
  }

  .header-link {
    font-size: var(--text-xs);
  }

  .language-row {
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
  }

  .swap-btn {
    width: 44px;
    height: 44px;
    align-self: center;
    transform: rotate(90deg);
    font-size: var(--text-xl);
  }

  .demo-intro {
    padding: 0 0.75rem 0.5rem;
  }

  .usage-steps {
    display: none;
  }

  .translate-btn {
    padding: 1rem;
    font-size: var(--text-lg);
    border-radius: var(--radius-sm);
  }

  .source-text-input {
    min-height: 90px;
    font-size: var(--text-base);
  }

  .slider-track input[type="range"] {
    height: 8px;
  }

  .slider-track input[type="range"]::-webkit-slider-thumb {
    width: 24px;
    height: 24px;
  }

  .slider-track input[type="range"]::-moz-range-thumb {
    width: 24px;
    height: 24px;
  }

  .back-translate-btn {
    width: 100%;
    padding: 0.75rem;
  }
}

/* --- Responsive: Phone (480px and below) --- */
@media (max-width: 480px) {
  .demo-main {
    padding: 0.5rem;
    gap: 0.5rem;
  }

  .panel {
    padding: 0.75rem;
    border-radius: 0.4rem;
  }

  .panel-title {
    font-size: var(--text-base);
    margin-bottom: 0.75rem;
  }

  /* Header: compact app-style */
  .demo-header {
    padding: 0.4rem 0.75rem;
  }

  .demo-header .brand h1 {
    font-size: var(--text-base);
  }

  .demo-header .brand .badge {
    font-size: 0.6rem;
    padding: 0.1rem 0.35rem;
  }

  .brand-icon {
    width: 22px;
    height: 22px;
  }

  .header-nav {
    gap: 0.5rem;
  }

  .header-link {
    font-size: 0.65rem;
  }

  /* Intro: minimal */
  .demo-intro {
    padding: 0 0.5rem 0.4rem;
  }

  .intro-content p {
    font-size: var(--text-xs);
    line-height: 1.5;
  }

  /* Language selectors: larger touch targets */
  .language-row select {
    padding: 0.7rem 0.75rem;
    font-size: var(--text-base);
  }

  .context-selector select {
    padding: 0.7rem 0.75rem;
    font-size: var(--text-base);
  }

  /* Rep legend: compact */
  .rep-legend {
    padding: 0.4rem 0.6rem;
    gap: 0.4rem;
    font-size: 0.65rem;
  }

  .rep-legend-title {
    font-size: 0.65rem;
  }

  .rep-dot {
    width: 7px;
    height: 7px;
  }

  /* Textarea: shorter on phone */
  .source-text-input {
    min-height: 70px;
  }

  .char-count {
    font-size: 0.65rem;
  }

  /* Examples: better touch targets */
  .example-pills {
    gap: 0.3rem;
  }

  .example-pill {
    padding: 0.4rem 0.65rem;
    font-size: 0.7rem;
  }

  /* Info buttons: larger hit area */
  .info-btn {
    width: 22px;
    height: 22px;
    font-size: 0.55rem;
  }

  .info-btn::after {
    width: 220px;
    font-size: 0.65rem;
    left: auto;
    right: -10px;
    transform: none;
  }

  .info-btn::before {
    left: auto;
    right: 5px;
    transform: none;
  }

  /* Sliders: tighter spacing */
  .dimension-slider {
    margin-bottom: 1rem;
  }

  .slider-name {
    font-size: var(--text-xs);
  }

  .slider-value {
    font-size: var(--text-xs);
  }

  .slider-labels {
    margin-top: 0.15rem;
  }

  .label-low, .label-high {
    font-size: 0.65rem;
  }

  /* Translate button: prominent, thumb-reachable */
  .translate-btn {
    padding: 0.9rem;
    font-size: var(--text-base);
    margin-top: 1rem;
    border-radius: 0.4rem;
  }

  .translate-hint {
    font-size: 0.6rem;
  }

  /* Defaults note */
  .defaults-note {
    font-size: 0.65rem;
    margin-bottom: 0.75rem;
  }

  /* Context selector label */
  .context-label {
    font-size: 0.65rem;
  }

  /* Output: tighter */
  .translation-text {
    min-height: 60px;
    padding: 0.75rem;
    font-size: var(--text-sm);
    line-height: 1.7;
  }

  .translation-column h4 {
    font-size: var(--text-xs);
    margin-bottom: 0.5rem;
  }

  /* Back-translation */
  .back-translation {
    margin-top: 1rem;
    padding-top: 1rem;
  }

  .back-translation-header {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .back-lang-select select {
    padding: 0.5rem;
    font-size: var(--text-sm);
  }

  .back-translate-btn {
    width: 100%;
    padding: 0.7rem;
    font-size: var(--text-sm);
  }

  /* Cultural insights: compact */
  .cultural-summary {
    padding: 0.75rem;
    font-size: var(--text-xs);
    line-height: 1.6;
  }

  .explanation-card {
    padding: 0.75rem;
  }

  .explanation-dimension {
    font-size: var(--text-xs);
  }

  .explanation-effect {
    font-size: var(--text-xs);
    line-height: 1.5;
  }

  .explanation-value {
    font-size: 0.6rem;
  }

  /* Footer: minimal */
  .demo-footer {
    padding: 0.6rem 0.75rem;
    font-size: 0.6rem;
  }

  /* Error message */
  .error-message {
    font-size: var(--text-xs);
    padding: 0.6rem 0.75rem;
  }
}

/* --- Responsive: Very small phone (360px and below) --- */
@media (max-width: 360px) {
  .demo-main {
    padding: 0.35rem;
    gap: 0.35rem;
  }

  .panel {
    padding: 0.6rem;
  }

  .demo-header .brand h1 {
    font-size: var(--text-sm);
  }

  .header-link {
    font-size: 0.6rem;
  }

  .intro-content p {
    font-size: 0.65rem;
  }
}

/* --- Reduced motion --- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}