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

:root {
  --bg: #0C0C0C;
  --bg-subtle: #18181b;
  --text-primary: #D7D7D7;
  --text-secondary: #7D7D7D;
  --radius-lg: 20px;
  --radius-md: 12px;
  --radius-sm: 8px;
  --font-display: 'Lora', Georgia, serif;
  --font-body: 'Geist', system-ui, sans-serif;
  --font-mono: 'Geist Mono', monospace;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { font-size: 16px; }

.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;
}

/* ── Back Nav ── */
.back-nav {
  position: fixed;
  top: 32px;
  left: 32px;
  z-index: 10;
}

.back-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text-primary);
  text-decoration: none;
  background: var(--bg-subtle);
  padding: 8px 16px;
  border-radius: 100px;
  transition: background 0.2s;
}

.back-btn:hover { background: #2a2a2a; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text-primary);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 3rem 1.5rem 4rem;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}


.input-description {
  color: var(--text-secondary);
  font-size: 1rem;
  line-height: 1.6;
  font-weight: 400;
  width: 100%;
  text-align: center;
  max-width: 384px;
}

/* ── Hex Input ── */
.input-row {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 3rem;
}
.input-controls {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}
.hex-input-wrapper {
  display: flex;
  align-items: center;
  background: var(--bg-subtle);
  border: 1px solid #27272a;
  border-radius: var(--radius-sm);
  padding: 0 0.875rem;
  height: 44px;
  gap: 0.5rem;
  transition: border-color var(--transition);
}
.hex-input-wrapper:focus-within {
  border-color: #52525b;
}
.hex-input-wrapper span {
  color: var(--text-secondary);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  user-select: none;
}
.hex-input {
  background: none;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.875rem;
  width: 5.5em;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
.hex-input::placeholder { color: #3f3f46; }


/* ── Preview Card ── */
.card-container {
  perspective: 1200px;
  margin-bottom: 2.5rem;
  width: 100%;
  max-width: 440px;
}

.preview-card {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: 0 4px 40px rgba(0,0,0,0.4), 0 0 0 1px rgba(255,255,255,0.04);
  transition: transform 0.5s ease;
}
.preview-card.tilting {
  transition: transform 0.08s ease;
}

/* Card light mode (default) */
.preview-card[data-mode="light"] {
  background: var(--card-bg, #faf8f5);
  color: var(--card-text, #1c1917);
}
.preview-card[data-mode="dark"] {
  background: var(--card-bg-dark, #1c1917);
  color: var(--card-text-dark, #faf8f5);
}

.card-hero {
  width: 100%;
  aspect-ratio: 16 / 9;
  position: relative;
  overflow: hidden;
  padding: 1.75rem 1.75rem 0;
}
.card-hero canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.card-body {
  padding: 1.75rem 1.75rem 1.5rem;
}

.card-meta-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 1rem;
}
.card-tag {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 0.3rem 0.75rem;
  border-radius: 100px;
  border: 1px solid;
}
.card-date {
  font-size: 0.75rem;
  font-weight: 400;
}

.card-title {
  font-family: var(--font-display);
  font-size: 1.625rem;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.01em;
  margin-bottom: 0.5rem;
}

.card-description {
  font-size: 1rem;
  line-height: 1.65;
  opacity: 0.7;
  font-weight: 400;
  margin-bottom: 1.5rem;
}

.card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 1.75rem 1.75rem;
}

.card-footer-left {
  display: flex;
  gap: 0.625rem;
}

.btn-card {
  padding: 0.625rem 1.25rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  border: none;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.btn-card svg { width: 14px; height: 14px; flex-shrink: 0; }

.btn-primary-card {
  color: white;
}
.btn-primary-card:hover { filter: brightness(1.1); }

.btn-secondary-card {
  background: transparent;
  border: 1px solid;
}
.btn-secondary-card:hover { filter: brightness(1.1); }

.btn-toggle-mode {
  position: absolute;
  top: 1rem;
  right: 1rem;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 2;
  transition: all var(--transition);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}
.btn-toggle-mode svg { width: 16px; height: 16px; }
.btn-toggle-mode:hover { transform: scale(1.1); }

/* ── Swatches ── */
.swatches-section {
  width: 100%;
  max-width: 720px;
  margin-bottom: 2rem;
}
.swatches-bar {
  display: flex;
  gap: 2px;
  border-radius: var(--radius-md);
  overflow: hidden;
}

.swatch {
  flex: 1;
  position: relative;
  cursor: pointer;
  transition: all var(--transition);
  min-height: 72px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 0.5rem 0.25rem;
}
.swatch:first-child { border-radius: var(--radius-md) 0 0 var(--radius-md); }
.swatch:last-child { border-radius: 0 var(--radius-md) var(--radius-md) 0; }

.swatch:hover {
  transform: scaleY(1.08);
  z-index: 2;
  box-shadow: 0 0 20px rgba(0,0,0,0.3);
}

.swatch-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 400;
  letter-spacing: 0.04em;
  opacity: 0;
  transition: opacity var(--transition);
  text-align: center;
  line-height: 1.4;
  pointer-events: none;
  width: 100%;
  overflow: hidden;
}
.swatch:hover .swatch-label { opacity: 1; }
.swatch-shade {
  display: block;
  font-weight: 500;
}
.swatch-hex {
  display: block;
  opacity: 0.7;
  text-transform: uppercase;
}


/* ── Toast ── */
.toast {
  position: fixed;
  bottom: 2rem;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: #27272a;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.875rem;
  font-weight: 400;
  padding: 0.625rem 1rem;
  border-radius: var(--radius-sm);
  border: 1px solid #3f3f46;
  opacity: 0;
  transition: all var(--transition);
  z-index: 100;
  pointer-events: none;
  white-space: nowrap;
}
.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}


/* ── Card colour tooltip ── */
.card-tooltip {
  position: fixed;
  z-index: 200;
  pointer-events: none;
  background: #18181b;
  border: 1px solid #3f3f46;
  border-radius: var(--radius-sm);
  padding: 0.5rem 0.75rem;
  display: grid;
  grid-template-columns: 8px max-content max-content max-content auto;
  column-gap: 0.75rem;
  row-gap: 0.35rem;
  align-items: center;
  box-shadow: 0 4px 24px rgba(0,0,0,0.5);
  opacity: 0;
  transition: opacity 0.15s ease;
  transform: translate(-50%, calc(-100% - 10px));
  font-family: var(--font-mono);
  font-size: 0.75rem;
  white-space: nowrap;
}
.card-tooltip.visible { opacity: 1; }
.card-tooltip-row {
  display: contents;
}
.card-tooltip-dot {
  width: 8px;
  height: 8px;
  border-radius: 2px;
}
.card-tooltip-role {
  color: var(--text-secondary);
}
.card-tooltip-shade {
  color: var(--text-primary);
  font-weight: 500;
}
.card-tooltip-hex {
  color: var(--text-secondary);
}
.card-tooltip-contrast {
  display: flex;
  align-items: center;
  gap: 0.3em;
}
.contrast-ratio {
  color: var(--text-primary);
}
.contrast-badge {
  font-family: var(--font-body);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  padding: 0.1em 0.35em;
  border-radius: 3px;
}
.contrast-aaa { background: rgba(34,197,94,0.18); color: #4ade80; }
.contrast-aa  { background: rgba(59,130,246,0.18); color: #60a5fa; }
.contrast-fail{ background: rgba(239,68,68,0.15);  color: #f87171; }

/* ── Entrance Animation ── */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(18px); }
  to   { opacity: 1; transform: translateY(0); }
}

.fade-in {
  opacity: 0;
  animation: fadeUp 0.8s ease forwards;
}

/* ── Responsive ── */
@media (max-width: 600px) {
  .card-hero { padding: 1.25rem 1.25rem 0; }
  .card-body { padding: 1.25rem; }
  .card-footer { padding: 0 1.25rem 1.25rem; }
  .swatch { min-height: 56px; }
  .input-controls { gap: 0.5rem; }
}