@import url("https://fonts.googleapis.com/css2?family=Familjen+Grotesk:wght@400;500;600;700&family=DM+Mono:wght@400;500&display=swap");

:root {
  /* Core palette */
  --bg-base: #0c0e14;
  --bg-raised: #13151d;
  --bg-surface: #1a1d28;
  --bg-surface-hover: #21252f;
  --bg-overlay: rgba(26, 29, 40, 0.85);

  /* Accent */
  --accent: #e8a634;
  --accent-dim: #c48a1e;
  --accent-glow: rgba(232, 166, 52, 0.15);
  --accent-text: #f5c563;

  /* Semantic */
  --success: #34d399;
  --success-bg: rgba(52, 211, 153, 0.12);
  --danger: #f87171;
  --danger-bg: rgba(248, 113, 113, 0.12);

  /* Text */
  --text-primary: #e8eaed;
  --text-secondary: #9ca3af;
  --text-muted: #6b7280;

  /* Borders */
  --border: rgba(255, 255, 255, 0.06);
  --border-accent: rgba(232, 166, 52, 0.25);

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 40px rgba(232, 166, 52, 0.08);

  /* Radius */
  --radius: 14px;
  --radius-sm: 8px;
  --radius-xs: 5px;

  /* Typography */
  --font-display: "Familjen Grotesk", system-ui, sans-serif;
  --font-mono: "DM Mono", "Consolas", monospace;

  /* Transitions */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
}

/* ---- Light theme ---- */

[data-theme="light"] {
  --bg-base: #f4f2ee;
  --bg-raised: #ffffff;
  --bg-surface: #edeae4;
  --bg-surface-hover: #e4e0d8;
  --bg-overlay: rgba(255, 255, 255, 0.9);

  --accent: #c47a15;
  --accent-dim: #a86510;
  --accent-glow: rgba(196, 122, 21, 0.1);
  --accent-text: #9a5d0a;

  --success: #16a34a;
  --success-bg: rgba(22, 163, 74, 0.1);
  --danger: #dc2626;
  --danger-bg: rgba(220, 38, 38, 0.1);

  --text-primary: #1c1917;
  --text-secondary: #57534e;
  --text-muted: #a8a29e;

  --border: rgba(0, 0, 0, 0.08);
  --border-accent: rgba(196, 122, 21, 0.3);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.1);
  --shadow-glow: 0 0 40px rgba(196, 122, 21, 0.06);
}

[data-theme="light"] body::before {
  background:
    radial-gradient(
      ellipse 80% 50% at 20% 0%,
      rgba(196, 122, 21, 0.05) 0%,
      transparent 60%
    ),
    radial-gradient(
      ellipse 60% 40% at 80% 100%,
      rgba(99, 102, 241, 0.04) 0%,
      transparent 60%
    ),
    radial-gradient(
      ellipse 50% 60% at 50% 50%,
      rgba(196, 122, 21, 0.02) 0%,
      transparent 70%
    );
}

[data-theme="light"] .alpha-swatch {
  background-image:
    linear-gradient(45deg, #d4d4d4 25%, transparent 25%),
    linear-gradient(-45deg, #d4d4d4 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #d4d4d4 75%),
    linear-gradient(-45deg, transparent 75%, #d4d4d4 75%);
}

[data-theme="light"] .header h1 svg {
  filter: drop-shadow(0 0 8px rgba(196, 122, 21, 0.25));
}

/* ---- Theme toggle (toggles.dev classic) ---- */

.theme-toggle {
  --theme-toggle__classic--duration: 500ms;
  border: none;
  background: 0 0;
  cursor: pointer;
  color: var(--text-secondary);
  font-size: 1.6rem;
  padding: 0.35rem;
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: color 0.2s;
}

.theme-toggle:hover {
  color: var(--accent);
}

.theme-toggle__classic path {
  transition-timing-function: cubic-bezier(0, 0, 0.15, 1.25);
  transform-origin: center;
  transition-duration: calc(var(--theme-toggle__classic--duration) * 0.8);
}

.theme-toggle__classic g path {
  transition-property: opacity, transform;
  transition-delay: calc(var(--theme-toggle__classic--duration) * 0.2);
}

.theme-toggle__classic :first-child path {
  transition-property: transform, d;
}

.theme-toggle--toggled:not(label).theme-toggle .theme-toggle__classic g path {
  transform: scale(0.5) rotate(45deg);
  opacity: 0;
  transition-delay: 0s;
}

.theme-toggle--toggled:not(label).theme-toggle
  .theme-toggle__classic
  :first-child
  path {
  d: path("M-12 5h30a1 1 0 0 0 9 13v24h-39Z");
  transition-delay: calc(var(--theme-toggle__classic--duration) * 0.2);
}

@supports not (d: path("")) {
  .theme-toggle--toggled:not(label).theme-toggle
    .theme-toggle__classic
    :first-child
    path {
    transform: translate3d(-12px, 10px, 0);
  }
}

@media (prefers-reduced-motion: reduce) {
  .theme-toggle:not(.theme-toggle--force-motion) * {
    transition: none !important;
  }
}

/* ---- Reset ---- */

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

button {
  border: none;
  background: none;
  font: inherit;
  color: inherit;
  cursor: pointer;
}

/* ---- Base ---- */

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-display);
  background: var(--bg-base);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition:
    background-color 0.35s,
    color 0.35s;
}

/* Atmospheric background */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(
      ellipse 80% 50% at 20% 0%,
      rgba(232, 166, 52, 0.06) 0%,
      transparent 60%
    ),
    radial-gradient(
      ellipse 60% 40% at 80% 100%,
      rgba(99, 102, 241, 0.05) 0%,
      transparent 60%
    ),
    radial-gradient(
      ellipse 50% 60% at 50% 50%,
      rgba(232, 166, 52, 0.02) 0%,
      transparent 70%
    );
  pointer-events: none;
  z-index: 0;
}

/* ---- Skip link ---- */

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  background: var(--accent);
  color: var(--bg-base);
  padding: 0.5rem 1rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  z-index: 998;
  text-decoration: none;
}

.skip-link:focus {
  top: 1rem;
}

/* ---- Layout ---- */

.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 1.5rem;
  position: relative;
  z-index: 1;
}

main.container {
  z-index: 2;
}

/* ---- Header ---- */

.header {
  padding: 3rem 0 2.5rem;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(
    180deg,
    rgba(232, 166, 52, 0.04) 0%,
    transparent 100%
  );
}

.header-content {
  text-align: center;
}

.header h1 {
  font-family: var(--font-display);
  font-size: 3.2rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  margin-bottom: 0.6rem;
}

.header h1 svg {
  width: 44px;
  height: 44px;
  stroke: var(--accent);
  filter: drop-shadow(0 0 12px rgba(232, 166, 52, 0.3));
}

.header h1 svg circle[fill="currentColor"] {
  fill: var(--accent);
}

.tagline {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 1.8rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.5;
}

.header-links {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  align-items: center;
}

.header-links .theme-toggle {
  margin-left: 0.25rem;
}

/* ---- Buttons ---- */

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.65rem 1.4rem;
  border-radius: var(--radius-sm);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.01em;
  transition: all 0.25s var(--ease-out);
  border: 1px solid transparent;
  cursor: pointer;
}

.btn svg {
  width: 18px;
  height: 18px;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-base);
  border-color: var(--accent);
}

.btn-primary:hover {
  background: var(--accent-dim);
  border-color: var(--accent-dim);
  transform: translateY(-1px);
  box-shadow: 0 4px 20px rgba(232, 166, 52, 0.25);
}

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

.btn-secondary:hover {
  background: var(--bg-surface-hover);
  border-color: rgba(255, 255, 255, 0.12);
}

/* ---- Navigation ---- */

.section-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 3rem;
  padding: 1.25rem;
  background: var(--bg-raised);
  border-radius: var(--radius);
  border: 1px solid var(--border);
}

.section-nav a {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.9rem;
  border-radius: var(--radius-xs);
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 500;
  transition: all 0.2s var(--ease-out);
  border: 1px solid transparent;
}

.section-nav a svg {
  width: 14px;
  height: 14px;
  opacity: 0.6;
}

.section-nav a:hover {
  color: var(--accent-text);
  background: var(--accent-glow);
  border-color: var(--border-accent);
}

/* ---- Sections ---- */

.section {
  margin-bottom: 3rem;
  animation: fadeInUp 0.5s var(--ease-out) both;
}

.section:nth-child(2) {
  animation-delay: 0.05s;
}
.section:nth-child(3) {
  animation-delay: 0.1s;
}
.section:nth-child(4) {
  animation-delay: 0.15s;
}
.section:nth-child(5) {
  animation-delay: 0.2s;
}
.section:nth-child(6) {
  animation-delay: 0.25s;
}
.section:nth-child(7) {
  animation-delay: 0.3s;
}
.section:nth-child(8) {
  animation-delay: 0.35s;
}
.section:nth-child(9) {
  animation-delay: 0.4s;
}
.section:nth-child(10) {
  animation-delay: 0.45s;
}

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

.section h2 {
  font-family: var(--font-display);
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 1.25rem;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.section h2 svg {
  width: 26px;
  height: 26px;
  stroke: var(--accent);
  flex-shrink: 0;
}

/* ---- Cards ---- */

.card {
  background: var(--bg-raised);
  border-radius: var(--radius);
  padding: 1.75rem;
  border: 1px solid var(--border);
  transition:
    background-color 0.35s,
    border-color 0.3s var(--ease-out),
    box-shadow 0.3s var(--ease-out);
}

.card:hover {
  border-color: rgba(255, 255, 255, 0.1);
  box-shadow: var(--shadow-glow);
}

/* ---- Inputs ---- */

.input-group {
  margin-bottom: 1.25rem;
}

.input-group label {
  display: block;
  margin-bottom: 0.4rem;
  font-weight: 500;
  font-size: 0.88rem;
  color: var(--text-secondary);
  letter-spacing: 0.01em;
}

.input-group input[type="color"] {
  width: 100%;
  height: 52px;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  background: var(--bg-surface);
  transition: border-color 0.2s;
}

.input-group input[type="color"]:hover {
  border-color: var(--border-accent);
}

.input-group input[type="range"] {
  width: calc(100% - 55px);
  margin-right: 0.75rem;
  accent-color: var(--accent);
  height: 6px;
}

.input-group span {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-text);
}

.input-group select {
  width: 100%;
  padding: 0.65rem 0.85rem;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  font-family: var(--font-display);
  font-size: 0.9rem;
  background: var(--bg-surface);
  color: var(--text-primary);
  cursor: pointer;
  transition: border-color 0.2s;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%239ca3af' viewBox='0 0 16 16'%3E%3Cpath d='M8 11L3 6h10z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.75rem center;
  padding-right: 2rem;
}

.input-group select:hover,
.input-group select:focus {
  border-color: var(--border-accent);
  outline: none;
}

/* ---- Color Picker Section ---- */

.color-picker-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.75rem;
}

.color-display {
  height: 180px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.3rem;
  font-weight: 700;
  box-shadow: var(--shadow-md);
  position: relative;
  overflow: hidden;
}

.color-display::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: var(--radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.1);
  pointer-events: none;
}

.conversions {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 0.75rem;
}

.conversion-item {
  background: var(--bg-surface);
  padding: 1rem;
  border-radius: var(--radius-sm);
  text-align: center;
  border: 1px solid var(--border);
}

.conversion-item strong {
  display: block;
  margin-bottom: 0.4rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.conversion-item code {
  font-family: var(--font-mono);
  background: var(--bg-base);
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius-xs);
  display: block;
  font-size: 0.85rem;
  color: var(--accent-text);
  word-break: break-all;
}

/* ---- Blending Section ---- */

.blend-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.75rem;
  margin-bottom: 1.75rem;
}

.blend-results {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.blend-item {
  text-align: center;
}

.blend-item h4 {
  margin-bottom: 0.6rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

.blend-swatch {
  height: 90px;
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

/* ---- Tints, Shades, Tones ---- */

.tst-grid {
  display: grid;
  gap: 1.75rem;
  margin-top: 1.5rem;
}

.tst-section h4 {
  margin-bottom: 0.75rem;
  color: var(--text-secondary);
  font-size: 1rem;
  font-weight: 500;
}

.tst-swatches {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(70px, 1fr));
  gap: 0.5rem;
}

.tst-swatch {
  aspect-ratio: 1;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  font-weight: 500;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.5);
  transition: transform 0.2s var(--ease-out);
  border: 1px solid rgba(255, 255, 255, 0.05);
  cursor: pointer;
}

.tst-swatch:hover {
  transform: scale(1.08);
  z-index: 1;
}

/* ---- Gradient Section ---- */

.gradient-controls {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.gradient-display {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(40px, 1fr));
  gap: 0;
  height: 72px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  box-shadow: var(--shadow-md);
  margin-bottom: 1rem;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.gradient-step {
  height: 100%;
  position: relative;
  transition: transform 0.15s var(--ease-out);
}

.gradient-step:hover {
  transform: scaleY(1.12);
  z-index: 1;
}

.gradient-step:hover::after {
  content: attr(data-color);
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  background: var(--bg-base);
  color: var(--accent-text);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-xs);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  white-space: nowrap;
  margin-bottom: 0.3rem;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

/* ---- Alpha Blending ---- */

.alpha-controls {
  display: grid;
  gap: 1.25rem;
  margin-bottom: 1.5rem;
}

.alpha-result {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 1.25rem;
  margin-top: 1.5rem;
}

.alpha-preview {
  text-align: center;
}

.alpha-preview h4 {
  margin-bottom: 0.6rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  font-weight: 500;
}

.alpha-swatch {
  height: 110px;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
  margin-bottom: 0.5rem;
  background-image:
    linear-gradient(45deg, #2a2a2a 25%, transparent 25%),
    linear-gradient(-45deg, #2a2a2a 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, #2a2a2a 75%),
    linear-gradient(-45deg, transparent 75%, #2a2a2a 75%);
  background-size: 16px 16px;
  background-position:
    0 0,
    0 8px,
    8px -8px,
    -8px 0px;
  position: relative;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

.alpha-swatch-inner {
  width: 100%;
  height: 100%;
  border-radius: var(--radius-sm);
}

/* ---- Delta E ---- */

.delta-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.75rem;
  margin-bottom: 1.5rem;
}

.delta-result {
  text-align: center;
  padding: 2rem;
  background: var(--bg-surface);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.delta-result h3 {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.delta-value {
  font-family: var(--font-mono);
  font-size: 3.5rem;
  font-weight: 500;
  color: var(--accent);
  margin: 0.75rem 0;
  letter-spacing: -0.03em;
}

.delta-interpretation {
  font-size: 1.05rem;
  color: var(--text-secondary);
  margin-bottom: 0.75rem;
}

.delta-colors {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

/* ---- Kelvin ---- */

.kelvin-display {
  text-align: center;
  padding: 1.5rem;
  margin: 1.5rem 0;
}

.kelvin-swatch-container {
  margin-bottom: 1.5rem;
}

.kelvin-info {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.75rem;
  margin-top: 1rem;
}

.kelvin-info-item {
  background: var(--bg-surface);
  padding: 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.kelvin-info-item strong {
  display: block;
  margin-bottom: 0.3rem;
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.kelvin-presets {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.kelvin-preset {
  background: var(--bg-surface);
  padding: 0.85rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.25s var(--ease-out);
  text-align: center;
  border: 1px solid var(--border);
}

.kelvin-preset:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-accent);
}

.kelvin-preset-swatch {
  height: 50px;
  border-radius: var(--radius-xs);
  margin-bottom: 0.5rem;
  box-shadow: var(--shadow-sm);
}

.kelvin-preset strong {
  display: block;
  margin-bottom: 0.15rem;
  font-size: 0.88rem;
  color: var(--text-primary);
}

.kelvin-preset div:last-child {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--text-muted);
}

/* ---- Contrast / Accessibility ---- */

.contrast-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.75rem;
  margin-bottom: 1.5rem;
}

.contrast-result {
  display: grid;
  gap: 1.5rem;
}

.contrast-ratio-display {
  text-align: center;
  padding: 1.75rem;
  background: var(--bg-surface);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.contrast-ratio-value {
  font-family: var(--font-mono);
  font-size: 3rem;
  font-weight: 500;
  color: var(--accent);
  letter-spacing: -0.03em;
}

.contrast-wcag {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
}

.wcag-item {
  padding: 1rem;
  border-radius: var(--radius-sm);
  text-align: center;
  border: 1px solid transparent;
}

.wcag-item strong {
  display: block;
  font-size: 0.8rem;
  letter-spacing: 0.03em;
  margin-bottom: 0.2rem;
}

.wcag-item div {
  font-size: 0.82rem;
}

.wcag-item__result {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 0.4rem;
  font-weight: 600;
  font-size: 0.85rem;
}

.wcag-item.pass {
  background: var(--success-bg);
  color: var(--success);
  border-color: rgba(52, 211, 153, 0.2);
}

.wcag-item.fail {
  background: var(--danger-bg);
  color: var(--danger);
  border-color: rgba(248, 113, 113, 0.2);
}

.wcag-item svg {
  width: 16px;
  height: 16px;
  vertical-align: middle;
  margin-right: 3px;
}

.contrast-preview {
  padding: 1.75rem;
  border-radius: var(--radius-sm);
  text-align: center;
  font-size: 1.3rem;
  font-weight: 600;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

/* ---- Harmony ---- */

.harmony-grid {
  display: grid;
  gap: 1.5rem;
  margin-top: 1.5rem;
}

.harmony-section h4 {
  margin-bottom: 0.6rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
}

.harmony-swatches {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* ---- Copyable Color ---- */

.copyable-color {
  padding: 0.65rem 0.85rem;
  gap: 6px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.85rem;
  box-shadow: var(--shadow-sm);
  transition:
    transform 0.15s var(--ease-out),
    box-shadow 0.15s var(--ease-out);
  border: 1px solid rgba(255, 255, 255, 0.08);
  position: relative;
  overflow: hidden;
}

.copyable-color::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(255, 255, 255, 0.06) 0%,
    transparent 60%
  );
  pointer-events: none;
}

.copyable-color:hover {
  transform: scale(1.03);
  box-shadow: var(--shadow-md);
}

.copyable-color:active {
  transform: scale(0.98);
}

.copyable-color svg {
  width: 16px;
  height: 16px;
}

.copyable-color__icon {
  opacity: 0.5;
  display: flex;
  align-items: center;
  transition: opacity 0.15s;
}

.copyable-color:hover .copyable-color__icon {
  opacity: 0.9;
}

/* ---- Palette Generator ---- */

.palette-controls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.palette-actions {
  display: flex;
  gap: 0.6rem;
  align-items: flex-end;
  padding-bottom: 1.25rem;
}

.palette-actions .btn {
  padding: 0.55rem 1.1rem;
  font-size: 0.85rem;
}

.palette-actions .btn svg {
  width: 16px;
  height: 16px;
}

.palette-display {
  display: flex;
  height: 280px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  margin-bottom: 1.25rem;
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.palette-swatch {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-end;
  cursor: pointer;
  transition: flex 0.4s var(--ease-out);
  position: relative;
  user-select: none;
  padding-bottom: 1rem;
  cursor: pointer;
}

.palette-swatch:hover {
  flex: 1.8;
}

.palette-swatch:active {
  filter: brightness(0.92);
}

/* Copy icon centered */
.palette-swatch__copy {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%) scale(0.8);
  opacity: 0;
  transition:
    opacity 0.2s,
    transform 0.2s var(--ease-out);
  background: rgba(0, 0, 0, 0.25);
  backdrop-filter: blur(4px);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.palette-swatch__copy svg {
  width: 18px;
  height: 18px;
}

.palette-swatch:hover .palette-swatch__copy {
  opacity: 1;
  transform: translate(-50%, -50%) scale(1);
}

/* Labels at bottom */
.palette-swatch__label {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  text-shadow: 0 1px 4px rgba(0, 0, 0, 0.35);
}

.palette-swatch__hex {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.palette-swatch__name {
  font-size: 0.65rem;
  font-weight: 500;
  opacity: 0.65;
  text-transform: capitalize;
}

.palette-export {
  display: flex;
  justify-content: flex-end;
}

@media (max-width: 640px) {
  .palette-display {
    height: auto;
    flex-direction: column;
  }

  .palette-swatch {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding: 0.85rem 1rem;
    min-height: 52px;
  }

  .palette-swatch__copy {
    position: static;
    transform: none;
    opacity: 0.6;
    width: 32px;
    height: 32px;
    background: rgba(0, 0, 0, 0.15);
  }

  .palette-swatch:hover .palette-swatch__copy {
    transform: none;
  }

  .palette-swatch__label {
    flex-direction: row;
    gap: 0.5rem;
  }

  .palette-swatch:hover {
    flex: 1;
  }
}

/* ---- Toast ---- */

.toast {
  position: fixed;
  bottom: 1.75rem;
  left: 50%;
  transform: translateX(-50%);
  background: var(--text-primary);
  color: var(--bg-base);
  font-family: var(--font-mono);
  font-size: 0.85rem;
  font-weight: 500;
  padding: 0.6rem 1.25rem;
  border-radius: 99px;
  box-shadow: var(--shadow-lg);
  z-index: 999;
  pointer-events: none;
  white-space: nowrap;
  animation: toast-in 0.25s var(--ease-out);
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateX(-50%) translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateX(-50%) translateY(0);
  }
}

/* ---- Footer ---- */

.footer {
  border-top: 1px solid var(--border);
  padding: 2.5rem 0;
  margin-top: 4rem;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.88rem;
  background: var(--bg-raised);
}

.footer p {
  margin-bottom: 0.5rem;
}

.footer p:last-child {
  margin-bottom: 0;
}

.footer svg {
  width: 14px;
  height: 14px;
  vertical-align: middle;
  stroke: var(--accent);
  fill: var(--accent);
}

.footer a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}

.footer a:hover {
  color: var(--accent-text);
}

/* ---- Responsive ---- */

@media (max-width: 768px) {
  .header {
    padding: 2rem 0 1.5rem;
  }

  .header h1 {
    font-size: 2.2rem;
  }

  .header h1 svg {
    width: 32px;
    height: 32px;
  }

  .tagline {
    font-size: 1rem;
  }

  .section h2 {
    font-size: 1.3rem;
  }

  .section h2 svg {
    width: 22px;
    height: 22px;
  }

  .card {
    padding: 1.25rem;
  }

  .color-picker-grid,
  .blend-controls,
  .gradient-controls,
  .delta-controls,
  .contrast-controls,
  .palette-controls {
    grid-template-columns: 1fr;
  }

  .blend-results {
    grid-template-columns: 1fr;
  }

  .alpha-result {
    grid-template-columns: 1fr;
  }

  .contrast-wcag {
    grid-template-columns: 1fr;
  }

  .kelvin-info {
    grid-template-columns: 1fr;
  }

  .header-links {
    flex-direction: column;
  }

  .section-nav {
    gap: 0.35rem;
    padding: 0.85rem;
  }

  .section-nav a {
    font-size: 0.75rem;
    padding: 0.35rem 0.7rem;
  }
}

@media (max-width: 480px) {
  .header h1 {
    font-size: 1.8rem;
  }

  .tst-swatches {
    grid-template-columns: repeat(auto-fit, minmax(55px, 1fr));
  }
}