/* contrast-check — Devya dark chrome. Vanilla CSS, no framework. */

:root {
  --bg: #0F1115;
  --panel: #16181B;
  --border: rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.14);
  --text: #f3f5f8;
  --text-2: #CCCCCC;
  --muted: #8a94a2;
  --accent: #B8C0CB;
  --pass: #4ec46a;
  --fail: #ff6b6b;
  --radius: 16px;
  --radius-sm: 10px;
  --mono: ui-monospace, "SFMono-Regular", "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Sora", system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
  background:
    radial-gradient(1100px 520px at 12% -8%, rgba(184, 192, 203, 0.06), transparent 60%),
    var(--bg);
  color: var(--text);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.mono { font-family: var(--mono); font-variant-ligatures: none; }

/* --- Focus + accessibility --- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 6px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 20;
  background: var(--panel);
  color: var(--text);
  padding: 10px 16px;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
}
.skip-link:focus { left: 16px; top: 16px; }

/* --- Header --- */
.site-header {
  max-width: 1120px;
  margin: 0 auto;
  padding: 44px 24px 8px;
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 22px;
  height: 22px;
  border-radius: 7px;
  background: linear-gradient(135deg, #0F1115 0%, #0F1115 49.5%, var(--accent) 49.5%, var(--accent) 100%);
  border: 1px solid var(--border-strong);
  box-shadow: inset 0 0 0 1px rgba(0, 0, 0, 0.4);
}
.brand-name {
  font-weight: 700;
  font-size: 1.28rem;
  letter-spacing: -0.02em;
}
.tagline {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 0.98rem;
  max-width: 46ch;
}

/* --- Layout --- */
.layout {
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 24px 8px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}
.controls { grid-column: 1; grid-row: 1; }
.result   { grid-column: 2; grid-row: 1 / span 2; }
.preview-panel { grid-column: 1; grid-row: 2; }

@media (max-width: 860px) {
  .layout { grid-template-columns: 1fr; }
  .controls, .result, .preview-panel { grid-column: 1; grid-row: auto; }
}

/* --- Panels --- */
.panel {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.panel-title {
  margin: 0 0 16px;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}

/* --- Fields --- */
.field { margin-bottom: 4px; }
.field + .field { margin-top: 4px; }
.field label {
  display: block;
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 8px;
}
.color-row {
  display: flex;
  align-items: center;
  gap: 10px;
}
.swatch-input {
  appearance: none;
  -webkit-appearance: none;
  width: 46px;
  height: 46px;
  padding: 0;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  background: transparent;
  cursor: pointer;
  flex: 0 0 auto;
}
.swatch-input::-webkit-color-swatch-wrapper { padding: 3px; }
.swatch-input::-webkit-color-swatch { border: none; border-radius: 7px; }
.swatch-input::-moz-color-swatch { border: none; border-radius: 7px; }

.hex-input {
  flex: 1 1 auto;
  min-width: 0;
  height: 46px;
  padding: 0 14px;
  font-size: 1rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text);
  background: #0F1115;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
}
.hex-input::placeholder { color: var(--muted); }
.hex-input[aria-invalid="true"] {
  border-color: var(--fail);
  box-shadow: 0 0 0 1px rgba(255, 107, 107, 0.35);
}

.copy-btn {
  flex: 0 0 auto;
  height: 46px;
  padding: 0 14px;
  font-family: inherit;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-2);
  background: #0F1115;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.copy-btn:hover { color: var(--text); border-color: var(--accent); }

.field-help {
  margin: 8px 0 0;
  font-size: 0.82rem;
  color: var(--muted);
}

/* --- Swap --- */
.swap-wrap { display: flex; justify-content: center; margin: 14px 0; }
.swap-btn {
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
  background: #0F1115;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: 8px 18px;
  cursor: pointer;
  transition: border-color 0.15s ease, transform 0.15s ease;
}
.swap-btn:hover { border-color: var(--accent); }
.swap-btn:active { transform: scale(0.97); }

/* --- Ratio readout --- */
.ratio-readout {
  margin: 0;
  font-size: clamp(2.6rem, 8vw, 3.9rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
  color: var(--text);
}
.ratio-suffix { color: var(--muted); font-weight: 500; }
.ratio-note {
  margin: 12px 0 22px;
  color: var(--muted);
  font-size: 0.88rem;
}

/* --- Matrix --- */
.matrix-title,
.suggest-title {
  margin: 0 0 12px;
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
}
.matrix {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.matrix-row {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 11px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: #0F1115;
}
.matrix-badge {
  flex: 0 0 auto;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: #0F1115;
}
.matrix-badge[data-state="pass"] { background: var(--pass); }
.matrix-badge[data-state="pass"]::before { content: "✓"; }
.matrix-badge[data-state="fail"] { background: var(--fail); }
.matrix-badge[data-state="fail"]::before { content: "✗"; }
.matrix-label {
  flex: 1 1 auto;
  font-size: 0.94rem;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}
.matrix-req { color: var(--muted); font-size: 0.82rem; }
.matrix-row[data-pass="true"]  { border-color: rgba(78, 196, 106, 0.28); }
.matrix-row[data-pass="false"] { border-color: rgba(255, 107, 107, 0.24); }

/* --- Suggest a fix --- */
.suggest {
  margin-top: 22px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}
.suggest-note {
  margin: 0 0 14px;
  color: var(--text-2);
  font-size: 0.9rem;
}
.suggest-row {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
}
.suggest-swatch {
  width: 34px;
  height: 34px;
  border-radius: 8px;
  border: 1px solid var(--border-strong);
  flex: 0 0 auto;
}
.suggest-hex { font-size: 1rem; font-weight: 600; text-transform: uppercase; }
.suggest-ratio { color: var(--pass); font-size: 0.9rem; }
.apply-btn {
  margin-left: auto;
  font-family: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  color: #0F1115;
  background: var(--accent);
  border: none;
  border-radius: var(--radius-sm);
  padding: 9px 18px;
  cursor: pointer;
  transition: filter 0.15s ease;
}
.apply-btn:hover { filter: brightness(1.08); }
.apply-btn:active { filter: brightness(0.95); }

/* --- Preview (user colors) --- */
.preview {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 26px;
  overflow-wrap: break-word;
  transition: background-color 0.12s ease, color 0.12s ease;
}
.preview > * { margin: 0; }
.preview > * + * { margin-top: 14px; }
.preview-heading { font-size: 1.35rem; font-weight: 700; letter-spacing: -0.01em; }
.preview-body { font-size: 1rem; }
.preview-large { font-size: 1.9rem; font-weight: 700; letter-spacing: -0.01em; }
.preview-small { font-size: 0.78rem; }

/* --- Footer --- */
.site-footer {
  max-width: 1120px;
  margin: 0 auto;
  padding: 28px 24px 44px;
  color: var(--muted);
  font-size: 0.88rem;
}
.site-footer a { color: var(--text-2); text-decoration: none; }
.site-footer a:hover { color: var(--accent); text-decoration: underline; }

/* --- Toast --- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  transform: translate(-50%, 12px);
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  padding: 10px 20px;
  font-size: 0.88rem;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 30;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; }
}