/* Tamil Tokenizer Playground Styles */
:root {
  --bg-primary: #0d1117;
  --bg-secondary: #161b22;
  --bg-tertiary: #21262d;
  --bg-hover: #30363d;
  --border-color: #30363d;
  --border-focus: #58a6ff;
  --text-primary: #f0f6fc;
  --text-secondary: #8b949e;
  --text-muted: #6e7681;
  --accent-color: #388bfd;
  --accent-bg: rgba(56, 139, 253, 0.15);
  --success-color: #3fb950;
  --success-bg: rgba(63, 185, 80, 0.15);
  --warning-color: #d29922;
  --warning-bg: rgba(210, 153, 34, 0.15);
  --danger-color: #f85149;
  --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --font-sans: 'Inter', 'Noto Sans Tamil', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'Fira Code', ui-monospace, SFMono-Regular, Menlo, monospace;
}

[data-theme="light"] {
  --bg-primary: #f6f8fa;
  --bg-secondary: #ffffff;
  --bg-tertiary: #f3f4f6;
  --bg-hover: #e5e7eb;
  --border-color: #d0d7de;
  --border-focus: #0969da;
  --text-primary: #1f2328;
  --text-secondary: #57606a;
  --text-muted: #8c959f;
  --accent-color: #0969da;
  --accent-bg: rgba(9, 105, 218, 0.1);
  --success-color: #1a7f37;
  --success-bg: rgba(26, 127, 55, 0.1);
  --warning-color: #9a6700;
  --warning-bg: rgba(154, 103, 0, 0.1);
  --danger-color: #cf222e;
  --card-shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

.app-container {
  max-width: 1440px;
  margin: 0 auto;
  padding: 1rem 1.5rem 3rem 1.5rem;
}

/* Header */
.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 1.5rem;
}

.header-left {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  flex-wrap: wrap;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
}

.logo-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: linear-gradient(135deg, #f59e0b, #ef4444);
  color: #ffffff;
  border-radius: var(--radius-md);
  font-family: 'Noto Sans Tamil', var(--font-sans);
  font-weight: 700;
  font-size: 1.1rem;
}

.badge {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.15rem 0.45rem;
  border-radius: 999px;
  background-color: var(--accent-bg);
  color: var(--accent-color);
  border: 1px solid var(--accent-color);
  vertical-align: middle;
  text-transform: uppercase;
}

.trust-badge {
  font-size: 0.8rem;
  color: var(--text-secondary);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  font-weight: 500;
}

.header-right {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.45rem 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all 0.15s ease-in-out;
  text-decoration: none;
}

.btn-sm {
  font-size: 0.8rem;
  padding: 0.35rem 0.7rem;
}

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

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

.btn-link {
  background: none;
  border: none;
  color: var(--accent-color);
  cursor: pointer;
  font-size: 0.8rem;
  padding: 0;
}
.btn-link:hover {
  text-decoration: underline;
}

/* Hero section */
.hero-section {
  margin-bottom: 1.5rem;
}

.hero-title {
  font-size: 1.75rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.35rem;
}

.hero-subtitle {
  font-size: 0.95rem;
  color: var(--text-secondary);
  max-width: 820px;
  margin-bottom: 1rem;
}

/* Preset Chips */
.preset-container {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.preset-label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.preset-chips {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.chip {
  background-color: var(--bg-secondary);
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 0.3rem 0.65rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.12s ease-in-out;
}
.chip:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
  border-color: var(--text-muted);
}
.chip.active {
  background-color: var(--accent-bg);
  color: var(--accent-color);
  border-color: var(--accent-color);
}

/* Input Section */
.input-section {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 1rem 1.25rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--card-shadow);
}

.input-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 0.5rem;
}

.input-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-primary);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.input-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.8rem;
  color: var(--text-secondary);
  font-family: var(--font-mono);
}

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

.input-wrapper textarea {
  width: 100%;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  resize: vertical;
  min-height: 80px;
  outline: none;
  transition: border-color 0.15s ease-in-out;
}
.input-wrapper textarea:focus {
  border-color: var(--border-focus);
}

/* Panels Grid */
.panels-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(420px, 1fr));
  gap: 1.25rem;
  margin-bottom: 2rem;
}

/* Panel Card */
.panel-card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: border-color 0.15s ease;
}

.panel-card.is-project {
  border-color: rgba(56, 139, 253, 0.5);
  box-shadow: 0 0 0 1px rgba(56, 139, 253, 0.2), var(--card-shadow);
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.75rem 1rem;
  background-color: var(--bg-tertiary);
  border-bottom: 1px solid var(--border-color);
  gap: 0.5rem;
}

.model-select-wrapper {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.model-select {
  background-color: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.65rem;
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  outline: none;
  cursor: pointer;
  max-width: 280px;
}

.panel-actions {
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.vocab-tag {
  font-size: 0.7rem;
  font-family: var(--font-mono);
  background-color: var(--bg-secondary);
  color: var(--text-muted);
  border: 1px solid var(--border-color);
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-sm);
}

.btn-icon {
  background: none;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.2rem 0.4rem;
  border-radius: var(--radius-sm);
  font-size: 1rem;
  line-height: 1;
}
.btn-icon:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

/* Metrics Row */
.metrics-strip {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-primary);
}

.metric-item {
  padding: 0.65rem 0.75rem;
  border-right: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}
.metric-item:last-child {
  border-right: none;
}

.metric-label {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.15rem;
}

.metric-value {
  font-size: 1.15rem;
  font-weight: 700;
  font-family: var(--font-mono);
  color: var(--text-primary);
}

.metric-value.highlight-good {
  color: var(--success-color);
}
.metric-value.highlight-diff {
  font-size: 0.85rem;
  display: inline-block;
  padding: 0.15rem 0.4rem;
  border-radius: var(--radius-sm);
  background-color: var(--success-bg);
}

/* View Switcher Tabs */
.view-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.4rem 1rem;
  background-color: var(--bg-secondary);
  border-bottom: 1px solid var(--border-color);
}

.tab-buttons {
  display: flex;
  gap: 0.25rem;
}

.tab-btn {
  background: none;
  border: none;
  padding: 0.25rem 0.6rem;
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: all 0.1s ease;
}
.tab-btn:hover {
  color: var(--text-primary);
  background-color: var(--bg-hover);
}
.tab-btn.active {
  color: var(--accent-color);
  background-color: var(--accent-bg);
  font-weight: 600;
}

.copy-tokens-btn {
  font-size: 0.75rem;
  background: none;
  border: 1px solid var(--border-color);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  cursor: pointer;
}
.copy-tokens-btn:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
}

/* Panel Body */
.panel-body {
  padding: 1rem;
  flex: 1;
  min-height: 220px;
  max-height: 480px;
  overflow-y: auto;
}

/* Token Spans Container */
.tokens-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 3px 2px;
  line-height: 1.8;
  font-family: var(--font-sans);
  font-size: 1.05rem;
  user-select: text;
}

/* Colored Token Spans */
.token-span {
  display: inline-block;
  padding: 0.05rem 0.25rem;
  border-radius: 4px;
  font-weight: 500;
  cursor: pointer;
  transition: transform 0.08s ease, box-shadow 0.08s ease;
  white-space: pre-wrap;
  word-break: break-all;
}

.token-span:hover {
  transform: translateY(-1px);
  box-shadow: 0 0 0 2px var(--border-focus);
  z-index: 2;
}

/* Alternating Pastels (7-color palette) */
.token-color-0 { background-color: rgba(14, 165, 233, 0.22); color: #38bdf8; }
.token-color-1 { background-color: rgba(16, 185, 129, 0.22); color: #34d399; }
.token-color-2 { background-color: rgba(139, 92, 246, 0.22); color: #a78bfa; }
.token-color-3 { background-color: rgba(245, 158, 11, 0.22); color: #fbbf24; }
.token-color-4 { background-color: rgba(244, 63, 94, 0.22); color: #fb7185; }
.token-color-5 { background-color: rgba(20, 184, 166, 0.22); color: #2dd4bf; }
.token-color-6 { background-color: rgba(99, 102, 241, 0.22); color: #818cf8; }

[data-theme="light"] .token-color-0 { background-color: rgba(14, 165, 233, 0.25); color: #0284c7; }
[data-theme="light"] .token-color-1 { background-color: rgba(16, 185, 129, 0.25); color: #059669; }
[data-theme="light"] .token-color-2 { background-color: rgba(139, 92, 246, 0.25); color: #7c3aed; }
[data-theme="light"] .token-color-3 { background-color: rgba(245, 158, 11, 0.25); color: #d97706; }
[data-theme="light"] .token-color-4 { background-color: rgba(244, 63, 94, 0.25); color: #e11d48; }
[data-theme="light"] .token-color-5 { background-color: rgba(20, 184, 166, 0.25); color: #0d9488; }
[data-theme="light"] .token-color-6 { background-color: rgba(99, 102, 241, 0.25); color: #4f46e5; }

.token-span.is-special {
  border: 1px dashed var(--warning-color);
  background-color: var(--warning-bg);
  color: var(--warning-color);
}

.whitespace-char {
  color: var(--text-muted);
  opacity: 0.6;
}

/* Token Table View */
.token-table-wrapper {
  width: 100%;
  overflow-x: auto;
}

.token-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.82rem;
  font-family: var(--font-mono);
}

.token-table th, .token-table td {
  padding: 0.4rem 0.6rem;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.token-table th {
  background-color: var(--bg-tertiary);
  color: var(--text-muted);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 0.7rem;
}

.token-table tr:hover {
  background-color: var(--bg-hover);
}

/* Hover Inspection Popover */
.token-popover {
  position: absolute;
  z-index: 100;
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 0.6rem 0.8rem;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.4);
  pointer-events: none;
  min-width: 220px;
  font-size: 0.8rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  transition: opacity 0.1s ease;
}

.popover-row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.popover-header {
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 0.3rem;
  margin-bottom: 0.1rem;
}

.popover-token-index {
  font-weight: 700;
  color: var(--text-primary);
}

.popover-token-id {
  font-family: var(--font-mono);
  font-weight: 600;
  color: var(--accent-color);
}

.popover-label {
  color: var(--text-muted);
  font-size: 0.75rem;
}

.popover-value {
  color: var(--text-primary);
  font-weight: 500;
  text-align: right;
  word-break: break-all;
}

.code-font {
  font-family: var(--font-mono);
}

/* Empty & Loading States */
.empty-state {
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100%;
  min-height: 160px;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.loading-indicator {
  display: inline-block;
  width: 14px;
  height: 14px;
  border: 2px solid var(--border-color);
  border-top-color: var(--accent-color);
  border-radius: 50%;
  animation: spin 0.6s linear infinite;
  vertical-align: middle;
}

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

/* Footer */
.footer {
  text-align: center;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border-color);
  font-size: 0.8rem;
  color: var(--text-muted);
}
.footer a {
  color: var(--accent-color);
  text-decoration: none;
}
.footer a:hover {
  text-decoration: underline;
}

/* Responsive tweaks */
@media (max-width: 768px) {
  .panels-grid {
    grid-template-columns: 1fr;
  }
  .hero-title {
    font-size: 1.4rem;
  }
}