/* =========================================================================
   Unicode Lookup — style.css
   Design: Clean, minimal, high contrast. Dark/light theme via data-theme.
   ========================================================================= */

/* ---------------------------------------------------------------------------
   Custom properties (light theme defaults)
   --------------------------------------------------------------------------- */
:root {
  --color-bg: #ffffff;
  --color-surface: #f8f9fa;
  --color-surface-2: #eef0f3;
  --color-border: #d0d7de;
  --color-text: #1f2328;
  --color-text-muted: #57606a;
  --color-accent: #0969da;
  --color-accent-hover: #0550ae;
  --color-accent-subtle: #ddf4ff;
  --color-success: #1a7f37;
  --color-error: #cf222e;
  --color-error-bg: #fff0ef;
  --color-char-display-bg: #f3f4f6;
  --color-char-display-border: #c9d1d9;

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;

  --font-mono: 'SFMono-Regular', 'Consolas', 'Liberation Mono', 'Courier New', monospace;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;

  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.10);

  --transition: 0.15s ease;

  --max-width: 900px;
}

[data-theme="dark"] {
  --color-bg: #0d1117;
  --color-surface: #161b22;
  --color-surface-2: #21262d;
  --color-border: #30363d;
  --color-text: #e6edf3;
  --color-text-muted: #8b949e;
  --color-accent: #58a6ff;
  --color-accent-hover: #79c0ff;
  --color-accent-subtle: #1f2d3d;
  --color-success: #3fb950;
  --color-error: #f85149;
  --color-error-bg: #2d1117;
  --color-char-display-bg: #21262d;
  --color-char-display-border: #30363d;
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

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

a {
  color: var(--color-accent);
  text-decoration: none;
}
a:hover { text-decoration: underline; }

/* ---------------------------------------------------------------------------
   Header
   --------------------------------------------------------------------------- */
.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  padding: 1rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow-sm);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.header-title h1 {
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.tagline {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 0.1rem;
}

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

/* ---------------------------------------------------------------------------
   Icon button
   --------------------------------------------------------------------------- */
.icon-btn {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  color: var(--color-text);
  cursor: pointer;
  padding: 0.3rem 0.75rem;
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  font-weight: 500;
  transition: background var(--transition), color var(--transition);
}
.icon-btn:hover {
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  border-color: var(--color-accent);
}

/* ---------------------------------------------------------------------------
   Main layout
   --------------------------------------------------------------------------- */
.main-content {
  flex: 1;
  max-width: var(--max-width);
  width: 100%;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 3rem;
}

/* ---------------------------------------------------------------------------
   Search section
   --------------------------------------------------------------------------- */
.search-section {
  margin-bottom: 1.5rem;
}

.mode-tabs {
  display: flex;
  gap: 0.25rem;
  flex-wrap: wrap;
  margin-bottom: 0.75rem;
}

.mode-tab {
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text-muted);
  cursor: pointer;
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all var(--transition);
}
.mode-tab:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}
.mode-tab.active {
  background: var(--color-accent);
  border-color: var(--color-accent);
  color: #ffffff;
}

.search-bar {
  display: flex;
  gap: 0.5rem;
}

.search-input {
  flex: 1;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-family: var(--font-mono);
  font-size: 1rem;
  padding: 0.65rem 1rem;
  outline: none;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.search-input:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(9,105,218,0.15);
}
[data-theme="dark"] .search-input:focus {
  box-shadow: 0 0 0 3px rgba(88,166,255,0.15);
}

.search-results {
  margin-top: 0.75rem;
}

.message {
  color: var(--color-text-muted);
  font-size: 0.9rem;
  padding: 0.75rem 0;
}
.message.error {
  color: var(--color-error);
  background: var(--color-error-bg);
  border: 1px solid var(--color-error);
  border-radius: var(--radius-sm);
  padding: 0.6rem 1rem;
}

/* ---------------------------------------------------------------------------
   Character panel
   --------------------------------------------------------------------------- */
.char-panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow-sm);
}

.char-display-wrapper {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 2rem 1rem;
  background: var(--color-char-display-bg);
  border-bottom: 1px solid var(--color-char-display-border);
}

.char-display {
  font-size: 7rem;
  line-height: 1;
  user-select: text;
  min-width: 1.5ch;
  text-align: center;
}

/* ---------------------------------------------------------------------------
   Info grid
   --------------------------------------------------------------------------- */
.info-grid {
  display: grid;
  grid-template-columns: 1fr;
  padding: 0.5rem 0;
}

.info-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.55rem 1.25rem;
  border-bottom: 1px solid var(--color-border);
  transition: background var(--transition);
}
.info-row:last-child { border-bottom: none; }
.info-row:hover { background: var(--color-surface-2); }

.info-label {
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  min-width: 130px;
  flex-shrink: 0;
}

.info-value {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  color: var(--color-text);
  flex: 1;
  word-break: break-all;
}

/* ---------------------------------------------------------------------------
   Copy button
   --------------------------------------------------------------------------- */
.copy-btn {
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  cursor: pointer;
  font-size: 0.72rem;
  padding: 0.2rem 0.55rem;
  flex-shrink: 0;
  transition: all var(--transition);
}
.copy-btn:hover {
  background: var(--color-accent-subtle);
  color: var(--color-accent);
  border-color: var(--color-accent);
}
.copy-btn.copied {
  background: var(--color-success);
  border-color: var(--color-success);
  color: #ffffff;
}

/* ---------------------------------------------------------------------------
   Normalization section
   --------------------------------------------------------------------------- */
.normalization-section {
  margin-bottom: 1.5rem;
}

.normalization-section h2 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-size: 0.8rem;
}

.norm-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
}

.norm-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.9rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  box-shadow: var(--shadow-sm);
}

.norm-name {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--color-accent);
  font-family: var(--font-mono);
}

.norm-desc {
  font-size: 0.72rem;
  color: var(--color-text-muted);
  line-height: 1.4;
}

.norm-char {
  font-size: 2.2rem;
  line-height: 1.2;
  margin: 0.2rem 0;
}

.norm-codepoints {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--color-text-muted);
  word-break: break-all;
}

/* ---------------------------------------------------------------------------
   Block browser
   --------------------------------------------------------------------------- */
.block-browser h2 {
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.block-filter-bar {
  margin-bottom: 1rem;
}

.block-filter-input {
  max-width: 400px;
}

.block-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.block-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: border-color var(--transition);
}
.block-item.selected {
  border-color: var(--color-accent);
}

.block-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  padding: 0.65rem 1rem;
  background: var(--color-surface-2);
  border-bottom: 1px solid var(--color-border);
}

.block-name {
  font-weight: 600;
  font-size: 0.9rem;
  flex: 1;
}

.block-range {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--color-text-muted);
}

.block-count {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 999px;
  padding: 0.1rem 0.5rem;
}

/* Character grid inside block */
.char-grid {
  display: flex;
  flex-wrap: wrap;
  padding: 0.5rem;
  gap: 1px;
}

.char-cell {
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--color-text);
  cursor: pointer;
  font-size: 1rem;
  height: 2.2rem;
  width: 2.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition);
  user-select: none;
}
.char-cell:hover {
  background: var(--color-accent-subtle);
  color: var(--color-accent);
}

.char-grid-more {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  padding: 0 0.5rem;
  display: flex;
  align-items: center;
}

/* ---------------------------------------------------------------------------
   Search result cards (name/block search)
   --------------------------------------------------------------------------- */
.result-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  cursor: pointer;
  margin-bottom: 0.5rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.result-card:hover {
  border-color: var(--color-accent);
  box-shadow: var(--shadow-sm);
}

.result-name {
  font-weight: 600;
  font-size: 0.9rem;
}

.result-range {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--color-text-muted);
  margin-top: 0.2rem;
}

/* ---------------------------------------------------------------------------
   Footer
   --------------------------------------------------------------------------- */
.site-footer {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  padding: 1rem 1.5rem;
  text-align: center;
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

/* ---------------------------------------------------------------------------
   Responsive
   --------------------------------------------------------------------------- */
@media (max-width: 600px) {
  .char-display {
    font-size: 5rem;
  }

  .info-label {
    min-width: 90px;
  }

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

  .header-title h1 {
    font-size: 1.1rem;
  }

  .tagline {
    display: none;
  }

  .mode-tab {
    font-size: 0.78rem;
    padding: 0.35rem 0.65rem;
  }
}

@media (max-width: 400px) {
  .norm-grid {
    grid-template-columns: 1fr;
  }
}