/* ===== CSS RESET & VARIABLES ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --font-display: 'Outfit', sans-serif;
  --font-body: 'DM Sans', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --shadow-xl: 0 16px 50px rgba(0,0,0,0.16);
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="light"] {
  --bg-primary: #f5f3f0;
  --bg-secondary: #ffffff;
  --bg-tertiary: #ebe8e4;
  --bg-input: #ffffff;
  --bg-hover: #f0ede9;
  --text-primary: #1a1816;
  --text-secondary: #5c5650;
  --text-tertiary: #8a8279;
  --border-primary: #ddd8d2;
  --border-secondary: #e8e4de;
  --accent: #e8553d;
  --accent-hover: #d44a33;
  --accent-soft: rgba(232, 85, 61, 0.08);
  --accent-glow: rgba(232, 85, 61, 0.2);
  --success: #2d9f5c;
  --warning: #d49b1a;
  --error: #d43b3b;
  --card-shadow: 0 1px 4px rgba(0,0,0,0.06), 0 4px 16px rgba(0,0,0,0.04);
  --picker-bg: #ffffff;
  --code-bg: #f7f5f2;
  --scrollbar-track: #ebe8e4;
  --scrollbar-thumb: #ccc7c0;
  --overlay: rgba(26, 24, 22, 0.4);
}

[data-theme="dark"] {
  --bg-primary: #111110;
  --bg-secondary: #1a1918;
  --bg-tertiary: #222120;
  --bg-input: #1e1d1c;
  --bg-hover: #2a2928;
  --text-primary: #f0ece6;
  --text-secondary: #a8a198;
  --text-tertiary: #706860;
  --border-primary: #333230;
  --border-secondary: #2a2928;
  --accent: #f06a50;
  --accent-hover: #f5826c;
  --accent-soft: rgba(240, 106, 80, 0.1);
  --accent-glow: rgba(240, 106, 80, 0.25);
  --success: #3dba6f;
  --warning: #e8b030;
  --error: #e85050;
  --card-shadow: 0 1px 4px rgba(0,0,0,0.2), 0 4px 16px rgba(0,0,0,0.15);
  --picker-bg: #1a1918;
  --code-bg: #161514;
  --scrollbar-track: #1a1918;
  --scrollbar-thumb: #3a3835;
  --overlay: rgba(0, 0, 0, 0.6);
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: var(--scrollbar-track); }
::-webkit-scrollbar-thumb { background: var(--scrollbar-thumb); border-radius: 3px; }

/* ===== ACCESSIBILITY ===== */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}
.skip-link {
  position: absolute;
  top: -100%;
  left: 16px;
  z-index: 10000;
  padding: 8px 16px;
  background: var(--accent);
  color: #fff;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: top 0.2s;
}
.skip-link:focus {
  top: 8px;
}
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
:focus:not(:focus-visible) {
  outline: none;
}

/* ===== BASE ===== */
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  transition: background var(--transition-slow), color var(--transition-slow);
}

/* ===== HEADER ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-primary);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
}
.logo-icon {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  background: linear-gradient(135deg, var(--accent), #f5a040);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}
.logo-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.5px;
}
.logo-text span { color: var(--accent); }
.header-actions { display: flex; align-items: center; gap: 8px; }

.privacy-badge {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  background: rgba(52, 211, 153, 0.1);
  color: #34d399;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.privacy-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #34d399;
  animation: pulse-privacy 2s ease infinite;
}

@keyframes pulse-privacy {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-primary);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition);
  font-size: 18px;
}
.theme-toggle:hover, .theme-toggle:focus-visible {
  border-color: var(--accent);
  color: var(--accent);
  background: var(--accent-soft);
}

/* ===== NAV TABS ===== */
.nav-tabs {
  max-width: 1200px;
  margin: 0 auto;
  padding: 16px 24px 0;
  display: flex;
  gap: 4px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.nav-tab {
  padding: 10px 20px;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  border: 1px solid transparent;
  border-bottom: none;
  background: transparent;
  color: var(--text-tertiary);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
  display: flex;
  align-items: center;
  gap: 8px;
}
.nav-tab .tab-icon { font-size: 16px; }
.nav-tab .tab-label { font-size: 14px; }
.nav-tab:hover, .nav-tab:focus-visible { color: var(--text-secondary); background: var(--bg-hover); }
.nav-tab.active {
  color: var(--text-primary);
  background: var(--bg-secondary);
  border-color: var(--border-primary);
}

/* ===== MAIN ===== */
.main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 60px;
}
.tab-panel { display: none; }
.tab-panel.active { display: block; }

/* ===== SECTION CARD ===== */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-lg);
  padding: 28px;
  margin-top: 24px;
  box-shadow: var(--card-shadow);
  transition: background var(--transition-slow), border-color var(--transition);
}
.card-title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.card-title .icon { font-size: 20px; }

/* ===== COLOR PREVIEW ===== */
.preview-strip {
  height: 140px;
  border-radius: var(--radius-lg);
  margin-bottom: 24px;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--border-primary);
  transition: background-color 0.15s ease;
  display: flex;
  align-items: flex-end;
  padding: 16px;
}
.preview-strip .preview-label {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  transition: all var(--transition);
}
.preview-light-text { color: #fff; background: rgba(0,0,0,0.35); }
.preview-dark-text { color: #000; background: rgba(255,255,255,0.5); }

/* ===== CONVERTER GRID ===== */
.converter-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.format-group { position: relative; }
.format-label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-tertiary);
  margin-bottom: 10px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.format-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  border-radius: var(--radius-full);
  font-size: 10px;
  font-weight: 600;
  background: var(--accent-soft);
  color: var(--accent);
}

/* ===== INPUTS ===== */
.input-row {
  display: flex;
  gap: 8px;
  align-items: stretch;
}
.input-wrap {
  flex: 1;
  position: relative;
}
.input-wrap label {
  display: block;
  font-size: 11px;
  font-weight: 500;
  color: var(--text-tertiary);
  margin-bottom: 4px;
  font-family: var(--font-mono);
}
.color-input {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  transition: all var(--transition);
  outline: none;
}
.color-input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.color-input::placeholder { color: var(--text-tertiary); opacity: 0.6; }
.color-input.input-error {
  border-color: var(--error);
  box-shadow: 0 0 0 3px rgba(212, 59, 59, 0.2);
}
.color-input.hex-input { font-size: 16px; padding: 12px 14px; }

.copy-btn {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  width: 32px;
  height: 32px;
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--text-tertiary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  transition: all var(--transition);
}
.copy-btn:hover, .copy-btn:focus-visible { background: var(--bg-hover); color: var(--accent); }
.copy-btn.copied { color: var(--success); }

.format-copy-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-primary);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  cursor: pointer;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  transition: all var(--transition);
  margin-top: 8px;
  white-space: nowrap;
}
.format-copy-btn:hover, .format-copy-btn:focus-visible { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
.format-copy-btn.copied { border-color: var(--success); color: var(--success); }

/* ===== NATIVE COLOR PICKER ===== */
.native-picker-wrap {
  display: flex;
  align-items: stretch;
  gap: 12px;
  margin-bottom: 20px;
}
.native-picker-box {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  border: 2px solid var(--border-primary);
  overflow: hidden;
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
  transition: border-color var(--transition);
}
.native-picker-box:hover { border-color: var(--accent); }
.native-picker-box input[type="color"] {
  position: absolute;
  inset: -10px;
  width: calc(100% + 20px);
  height: calc(100% + 20px);
  border: none;
  cursor: pointer;
  background: none;
}
.native-picker-box input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
.native-picker-box input[type="color"]::-webkit-color-swatch { border: none; border-radius: 0; }

.picker-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 4px;
}
.picker-info-label {
  font-size: 12px;
  color: var(--text-tertiary);
  font-weight: 500;
}
.picker-info-value {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.5px;
}

/* ===== PALETTE SECTION ===== */
.palette-type-selector {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 20px;
}
.palette-type-btn {
  padding: 8px 16px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-primary);
  background: transparent;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}
.palette-type-btn:hover, .palette-type-btn:focus-visible { border-color: var(--text-tertiary); }
.palette-type-btn.active {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}
.palette-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 12px;
}
.palette-swatch {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--border-primary);
  cursor: pointer;
  transition: all var(--transition);
}
.palette-swatch:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.palette-swatch-color {
  height: 80px;
  transition: background-color 0.15s ease;
}
.palette-swatch-info {
  padding: 10px;
  background: var(--bg-secondary);
}
.palette-swatch-hex {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
}
.palette-swatch-name {
  font-size: 11px;
  color: var(--text-tertiary);
  margin-top: 2px;
}

/* ===== CONTRAST CHECKER ===== */
.contrast-inputs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-bottom: 20px;
}
.contrast-input-group { display: flex; flex-direction: column; gap: 8px; }
.contrast-input-group label {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
}
.contrast-color-row {
  display: flex;
  gap: 8px;
  align-items: center;
}
.contrast-picker {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border-primary);
  overflow: hidden;
  cursor: pointer;
  position: relative;
  flex-shrink: 0;
}
.contrast-picker input[type="color"] {
  position: absolute;
  inset: -6px;
  width: calc(100% + 12px);
  height: calc(100% + 12px);
  border: none;
  cursor: pointer;
}
.contrast-picker input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; }
.contrast-picker input[type="color"]::-webkit-color-swatch { border: none; }

.contrast-preview {
  border-radius: var(--radius-lg);
  padding: 28px;
  text-align: center;
  margin-bottom: 20px;
  border: 1px solid var(--border-primary);
}
.contrast-preview-large {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  margin-bottom: 6px;
}
.contrast-preview-small {
  font-size: 14px;
  line-height: 1.5;
  max-width: 500px;
  margin: 0 auto;
}
.contrast-results {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 12px;
}
.contrast-result-card {
  padding: 16px;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-primary);
  background: var(--bg-tertiary);
  text-align: center;
}
.contrast-ratio {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
}
.contrast-label {
  font-size: 12px;
  color: var(--text-tertiary);
  margin-top: 4px;
  font-weight: 500;
}
.contrast-badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  border-radius: var(--radius-full);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-top: 8px;
}
.badge-pass { background: rgba(45, 159, 92, 0.15); color: var(--success); }
.badge-fail { background: rgba(212, 59, 59, 0.15); color: var(--error); }

/* ===== CSS OUTPUT ===== */
.css-output-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 20px;
}
.css-block {
  background: var(--code-bg);
  border: 1px solid var(--border-primary);
  border-radius: var(--radius-md);
  padding: 14px;
  position: relative;
}
.css-block-label {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  margin-bottom: 6px;
}
.css-block code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  display: block;
  word-break: break-all;
}
.css-block .copy-btn {
  position: absolute;
  right: 8px;
  top: 8px;
  transform: none;
}

/* ===== HISTORY ===== */
.history-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.history-chip {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px 6px 6px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-primary);
  background: var(--bg-tertiary);
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
}
.history-chip:hover { border-color: var(--accent); }
.history-dot {
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1px solid var(--border-primary);
  flex-shrink: 0;
}

/* ===== EYEDROPPER ===== */
.eyedropper-btn {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-primary);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}
.eyedropper-btn:hover, .eyedropper-btn:focus-visible { border-color: var(--accent); color: var(--accent); }

/* ===== TOAST ===== */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(80px);
  padding: 12px 24px;
  border-radius: var(--radius-full);
  background: var(--text-primary);
  color: var(--bg-primary);
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  box-shadow: var(--shadow-xl);
  transition: transform 0.35s cubic-bezier(0.34, 1.56, 0.64, 1);
  z-index: 1000;
  pointer-events: none;
}
.toast.show { transform: translateX(-50%) translateY(0); }

/* ===== IMAGE PICKER ===== */
.image-upload-zone {
  border: 2px dashed var(--border-primary);
  border-radius: var(--radius-lg);
  padding: 40px 20px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  position: relative;
}
.image-upload-zone:hover, .image-upload-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-soft);
}
.image-upload-zone .upload-icon { font-size: 36px; margin-bottom: 12px; display: block; }
.image-upload-zone .upload-text { color: var(--text-secondary); font-size: 14px; }
.image-upload-zone .upload-text strong { color: var(--accent); }
.image-upload-zone input { display: none; }

.image-preview-area {
  display: none;
  margin-top: 16px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border-primary);
  position: relative;
}
.image-preview-area img {
  width: 100%;
  max-height: 300px;
  object-fit: contain;
  display: block;
  background: repeating-conic-gradient(var(--bg-tertiary) 0% 25%, transparent 0% 50%) 50% / 16px 16px;
}
.image-preview-area canvas {
  display: none;
}
.image-color-result {
  display: none;
  margin-top: 16px;
}
.picked-color-info {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-md);
  border: 1px solid var(--border-primary);
}
.picked-color-swatch {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-primary);
  flex-shrink: 0;
}
.picked-color-values {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.picked-color-values span {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-secondary);
}
.use-color-btn {
  margin-left: auto;
  padding: 10px 18px;
  border-radius: var(--radius-sm);
  border: none;
  background: var(--accent);
  color: #fff;
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition);
  white-space: nowrap;
}
.use-color-btn:hover, .use-color-btn:focus-visible { background: var(--accent-hover); }

/* ===== NAMED COLORS ===== */
.named-colors-search {
  margin-bottom: 16px;
}
.named-colors-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 8px;
  max-height: 440px;
  overflow-y: auto;
  padding-right: 4px;
}
.named-color-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-secondary);
  cursor: pointer;
  transition: all var(--transition);
}
.named-color-item:hover { border-color: var(--accent); background: var(--accent-soft); }
.named-color-dot {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1px solid var(--border-primary);
  flex-shrink: 0;
}
.named-color-info {
  overflow: hidden;
}
.named-color-name {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.named-color-hex {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-tertiary);
}

/* ===== RANDOM BTN ===== */
.random-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-primary);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}
.random-btn:hover, .random-btn:focus-visible { border-color: var(--accent); color: var(--accent); }

/* ===== SWAP BTN ===== */
.swap-btn {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-full);
  border: 1px solid var(--border-primary);
  background: var(--bg-tertiary);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  transition: all var(--transition);
  margin: 0 auto;
  align-self: center;
}
.swap-btn:hover, .swap-btn:focus-visible { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }

/* ===== FOOTER ===== */
.footer {
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 24px;
  border-top: 1px solid var(--border-primary);
  text-align: center;
  font-size: 13px;
  color: var(--text-tertiary);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .converter-grid { grid-template-columns: 1fr; }
  .contrast-inputs { grid-template-columns: 1fr; }
  .css-output-grid { grid-template-columns: 1fr; }
  .card { padding: 20px; }
  .preview-strip { height: 100px; }
  .header-inner { padding: 0 16px; }
  .main { padding: 0 16px 40px; }
  .nav-tabs { padding: 12px 16px 0; }
  .named-colors-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); }
}
@media (max-width: 480px) {
  .palette-grid { grid-template-columns: repeat(auto-fill, minmax(90px, 1fr)); }
  .contrast-results { grid-template-columns: 1fr 1fr; }
  .input-row { flex-direction: column; }
}

/* ===== SITE FOOTER ===== */
.site-footer{
  margin-top:60px;padding:48px 28px 36px;
  border-top:1px solid var(--border-primary);
  background:var(--bg-primary);color:var(--text-secondary);
  font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  font-size:14px;line-height:1.6;
}
.site-footer .footer-inner{max-width:1100px;margin:0 auto}
.site-footer .footer-grid{
  display:grid;grid-template-columns:2fr 1fr 1fr 1fr;
  gap:40px;margin-bottom:40px;
}
.site-footer .footer-brand{display:flex;align-items:center;gap:10px;margin-bottom:16px}
.site-footer .footer-brand svg{width:32px;height:32px;color:#a855f7;flex-shrink:0}
.site-footer .footer-brand-name{
  font-size:20px;font-weight:700;
  background:linear-gradient(90deg,#8B5CF6,#EC4899,#3B82F6);
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.site-footer .footer-desc{color:var(--text-tertiary);margin-bottom:16px;max-width:360px}
.site-footer .footer-copy{font-size:12px;color:var(--text-tertiary);opacity:.7}
.site-footer h3{font-weight:700;margin-bottom:16px;color:var(--text-primary);font-size:15px}
.site-footer ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:10px}
.site-footer a{color:var(--text-secondary);text-decoration:none;transition:color .2s}
.site-footer a:hover{color:#a855f7}
.site-footer .footer-bottom{
  border-top:1px solid var(--border-primary);
  padding-top:20px;text-align:center;
}
.site-footer .footer-bottom p{color:var(--text-tertiary);font-size:13px;opacity:.7}
.site-footer .footer-bottom span{color:#a855f7}

@media(max-width:768px){
  .site-footer .footer-grid{grid-template-columns:1fr;gap:32px}
  .site-footer{padding:36px 16px 28px}
}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}