/*
  hueshift.net — shared design system
  Zero external requests: system fonts, CSS gradients, inline SVG only.

  Token system
  ------------
  Neutrals:  --ink (near-black violet-charcoal), --paper (near-white violet)
  Signal chips (the "spectrum"): magenta / amber / lime / cyan / violet
  The active signal chip drives --accent everywhere via the swatch rail —
  that's the site's signature interaction (see assets/app.js).
*/

:root {
  --ink: #121017;
  --ink-raised: #1b1826;
  --ink-line: #322c44;
  --paper: #f6f3ff;
  --paper-dim: #cdc6e6;

  --sig-magenta: #ff3e7f;
  --sig-amber: #ffb627;
  --sig-lime: #a6e22e;
  --sig-cyan: #2fe6d9;
  --sig-violet: #8b5cf6;

  --accent: var(--sig-magenta);
  --accent-rgb: 255, 62, 127;
  --accent-2: var(--sig-violet);

  --bg: var(--ink);
  --bg-raised: var(--ink-raised);
  --line: var(--ink-line);
  --fg: var(--paper);
  --fg-dim: var(--paper-dim);

  --radius: 14px;
  --radius-sm: 8px;

  --font-display: -apple-system, "Avenir Next", "Segoe UI", system-ui, sans-serif;
  --font-body: -apple-system, system-ui, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Code", "Menlo", "Consolas", monospace;

  --shadow-lift: 0 20px 60px -20px rgba(0, 0, 0, 0.6);
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: var(--paper);
  --bg-raised: #ffffff;
  --line: #ded7f2;
  --fg: var(--ink);
  --fg-dim: #5b5470;
  --shadow-lift: 0 20px 50px -22px rgba(60, 40, 90, 0.35);
  color-scheme: light;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: var(--paper);
    --bg-raised: #ffffff;
    --line: #ded7f2;
    --fg: var(--ink);
    --fg-dim: #5b5470;
    --shadow-lift: 0 20px 50px -22px rgba(60, 40, 90, 0.35);
    color-scheme: light;
  }
}

* {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-body);
  line-height: 1.55;
  transition: background 0.25s ease, color 0.25s ease;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

main {
  flex: 1;
}

a {
  color: var(--accent);
}

code,
kbd,
.mono {
  font-family: var(--font-mono);
}

h1,
h2,
h3 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.08;
  margin: 0 0 0.5em;
}

p {
  margin: 0 0 1em;
  color: var(--fg-dim);
  max-width: 62ch;
}

.wrap {
  width: 100%;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- header / nav ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(14px);
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 20px;
  padding-top: 14px;
  padding-bottom: 14px;
}

.wordmark {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: -0.03em;
  text-decoration: none;
  white-space: nowrap;
  background: linear-gradient(
    90deg,
    var(--sig-magenta),
    var(--sig-amber),
    var(--sig-lime),
    var(--sig-cyan),
    var(--sig-violet),
    var(--sig-magenta)
  );
  background-size: 220% 100%;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: hue-sweep 10s linear infinite;
}

@keyframes hue-sweep {
  from {
    background-position: 0% 50%;
  }
  to {
    background-position: 220% 50%;
  }
}

.tool-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 2px;
  list-style: none;
  margin: 0;
  padding: 0;
  flex: 1;
}

.tool-nav a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 11px;
  border-radius: 999px;
  color: var(--fg-dim);
  text-decoration: none;
  font-size: 13.5px;
  font-weight: 600;
  white-space: nowrap;
  border: 1px solid transparent;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.tool-nav a:hover {
  color: var(--fg);
  border-color: var(--line);
}

.tool-nav a[aria-current="page"] {
  color: var(--bg);
  background: var(--accent);
  border-color: var(--accent);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: 8px;
}

.theme-toggle {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--bg-raised);
  color: var(--fg);
  width: 36px;
  height: 36px;
  border-radius: 999px;
  display: grid;
  place-items: center;
  cursor: pointer;
  flex-shrink: 0;
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
}

.nav-toggle {
  display: none;
  appearance: none;
  border: 1px solid var(--line);
  background: var(--bg-raised);
  color: var(--fg);
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

@media (max-width: 880px) {
  .nav-toggle {
    display: grid;
    place-items: center;
  }
  .tool-nav {
    display: none;
    order: 5;
    width: 100%;
    flex-basis: 100%;
    padding-top: 10px;
  }
  .site-header .wrap {
    flex-wrap: wrap;
  }
  .tool-nav.is-open {
    display: flex;
  }
}

/* ---------- swatch rail (signature element) ---------- */

.swatch-rail {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  align-items: center;
}

.swatch-rail button {
  appearance: none;
  border: 2px solid rgba(255, 255, 255, 0.18);
  cursor: pointer;
  width: 30px;
  height: 30px;
  border-radius: 999px;
  padding: 0;
  transition: transform 0.15s ease, border-color 0.15s ease;
  position: relative;
}

.swatch-rail button:hover {
  transform: translateY(-3px) scale(1.08);
}

.swatch-rail button[aria-pressed="true"] {
  border-color: var(--fg);
}

.swatch-rail button[aria-pressed="true"]::after {
  content: "";
  position: absolute;
  inset: -6px;
  border-radius: 999px;
  border: 1px dashed var(--fg-dim);
}

.swatch-rail .rail-label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--fg-dim);
  margin-right: 4px;
}

/* ---------- hero ---------- */

.hero {
  padding: 64px 0 40px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  inset: -30% -10% auto -10%;
  height: 480px;
  background: conic-gradient(
    from 0deg,
    var(--sig-magenta),
    var(--sig-amber),
    var(--sig-lime),
    var(--sig-cyan),
    var(--sig-violet),
    var(--sig-magenta)
  );
  filter: blur(120px) saturate(140%);
  opacity: 0.35;
  z-index: -1;
  animation: drift 26s linear infinite;
}

@media (prefers-reduced-motion: reduce) {
  .hero::before,
  .wordmark {
    animation: none;
  }
}

@keyframes drift {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

.hero h1 {
  font-size: clamp(2.4rem, 5.4vw, 4.2rem);
  max-width: 16ch;
}

.hero .lede {
  font-size: 1.15rem;
  max-width: 52ch;
}

.hero .rail-row {
  margin: 28px 0 6px;
  padding: 14px 16px;
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
}

/* ---------- tool cards / overview grid ---------- */

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  margin: 28px 0 56px;
}

.tool-card {
  display: block;
  text-decoration: none;
  color: var(--fg);
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 20px;
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.tool-card:hover {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--accent) 60%, var(--line));
  box-shadow: var(--shadow-lift);
}

.tool-card .chip {
  width: 34px;
  height: 34px;
  border-radius: 10px;
  display: grid;
  place-items: center;
  margin-bottom: 14px;
}

.tool-card .chip svg {
  width: 18px;
  height: 18px;
}

.tool-card h3 {
  font-size: 17px;
  margin-bottom: 6px;
}

.tool-card p {
  font-size: 14px;
  margin: 0;
}

/* ---------- panels (tool workspaces) ---------- */

.panel {
  padding: 8px 0 64px;
}

.panel-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 20px;
}

.panel-head h2,
.panel-head h1 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin: 0;
}

.back-to-tools {
  font-size: 13px;
  font-weight: 600;
  text-decoration: none;
  color: var(--fg-dim);
  border: 1px solid var(--line);
  padding: 6px 12px;
  border-radius: 999px;
}

.back-to-tools:hover {
  color: var(--fg);
  border-color: var(--accent);
}

.workspace {
  background: var(--bg-raised);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow-lift);
}

.controls-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  margin-bottom: 20px;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.field label {
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-dim);
  font-weight: 700;
}

.field input[type="text"],
.field input[type="number"] {
  background: var(--bg);
  border: 1px solid var(--line);
  color: var(--fg);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: 14px;
  width: 100%;
}

.field input[type="color"] {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 44px;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 0;
  background: none;
  cursor: pointer;
}

.field input[type="color"]::-webkit-color-swatch-wrapper {
  padding: 0;
}
.field input[type="color"]::-webkit-color-swatch {
  border: none;
  border-radius: var(--radius-sm);
}
.field input[type="color"]::-moz-color-swatch {
  border: none;
  border-radius: var(--radius-sm);
}

.field input[type="range"] {
  width: 100%;
  accent-color: var(--accent);
}

.field select {
  background: var(--bg);
  border: 1px solid var(--line);
  color: var(--fg);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-family: var(--font-body);
  font-size: 14px;
  width: 100%;
}

.range-value {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--fg-dim);
}

.copy-row {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  margin-bottom: 10px;
}

.copy-row .value {
  font-family: var(--font-mono);
  font-size: 14px;
  flex: 1;
  overflow-x: auto;
  white-space: nowrap;
  user-select: all;
}

.copy-row .label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--fg-dim);
  min-width: 44px;
}

button.copy-btn {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--bg-raised);
  color: var(--fg);
  font-family: var(--font-body);
  font-size: 12px;
  font-weight: 700;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

button.copy-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

button.copy-btn.is-copied {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--bg);
}

button.action-btn {
  appearance: none;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--bg);
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 14px;
  padding: 10px 16px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

button.ghost-btn {
  appearance: none;
  border: 1px solid var(--line);
  background: transparent;
  color: var(--fg);
  font-weight: 600;
  font-size: 13px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
}

.swatch-preview {
  height: 96px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  margin-bottom: 18px;
}

.stack {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.hstack {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

/* ---------- gradient tool ---------- */

.stop-row {
  display: grid;
  grid-template-columns: auto 1fr auto auto;
  gap: 10px;
  align-items: center;
  margin-bottom: 8px;
}

.stop-row input[type="color"] {
  width: 44px;
  height: 36px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: none;
  cursor: pointer;
}

.stop-row .pos-value {
  font-family: var(--font-mono);
  font-size: 12px;
  width: 44px;
  text-align: right;
  color: var(--fg-dim);
}

.gradient-preview {
  height: 160px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  margin-bottom: 18px;
}

/* ---------- palette tool ---------- */

.palette-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 12px;
  margin-bottom: 16px;
}

.palette-chip {
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--line);
}

.palette-chip .swatch {
  height: 76px;
}

.palette-chip .meta {
  padding: 8px 10px;
  background: var(--bg);
  font-family: var(--font-mono);
  font-size: 12px;
}

.palette-chip .meta button {
  margin-top: 4px;
}

.scheme-tabs {
  display: flex;
  gap: 6px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}

.scheme-tabs button {
  appearance: none;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--fg-dim);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 700;
  cursor: pointer;
}

.scheme-tabs button[aria-pressed="true"] {
  color: var(--bg);
  background: var(--accent);
  border-color: var(--accent);
}

/* ---------- contrast tool ---------- */

.contrast-demo {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  padding: 32px 24px;
  text-align: center;
  margin-bottom: 18px;
}

.contrast-demo .big {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 6px;
}

.contrast-demo .small {
  font-size: 14px;
}

.ratio-display {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 16px;
}

.ratio-display .num {
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 800;
}

.verdicts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 10px;
}

.verdict {
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 12px;
  font-size: 13px;
}

.verdict .tag {
  font-weight: 800;
  font-size: 12px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  display: inline-block;
  margin-bottom: 4px;
  padding: 2px 8px;
  border-radius: 999px;
}

.verdict.pass .tag {
  background: color-mix(in srgb, var(--sig-lime) 25%, transparent);
  color: var(--sig-lime);
}

.verdict.fail .tag {
  background: color-mix(in srgb, var(--sig-magenta) 25%, transparent);
  color: var(--sig-magenta);
}

/* ---------- image extractor ---------- */

.dropzone {
  border: 2px dashed var(--line);
  border-radius: var(--radius);
  padding: 36px 20px;
  text-align: center;
  cursor: pointer;
  margin-bottom: 18px;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.dropzone.is-drag {
  border-color: var(--accent);
  background: color-mix(in srgb, var(--accent) 8%, transparent);
}

.dropzone input[type="file"] {
  display: none;
}

.dropzone p {
  color: var(--fg);
  margin: 0 0 6px;
}

.dropzone .privacy-note {
  font-size: 12px;
  margin-top: 8px;
  color: var(--fg-dim) !important;
}

.extract-preview {
  display: none;
  gap: 20px;
  margin-bottom: 18px;
  align-items: flex-start;
  flex-wrap: wrap;
}

.extract-preview.is-visible {
  display: flex;
}

.extract-preview img {
  max-width: 240px;
  max-height: 240px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--line);
}

/* ---------- content sections (per-tool SEO copy) ---------- */

.content-section {
  padding: 44px 0;
  border-top: 1px solid var(--line);
}

.content-section h2 {
  font-size: 1.5rem;
}

.faq dt {
  font-weight: 700;
  margin-top: 16px;
}

.faq dd {
  margin: 6px 0 0;
  color: var(--fg-dim);
}

.related-links {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-top: 12px;
}

.related-links a {
  text-decoration: none;
  font-size: 13px;
  font-weight: 700;
  border: 1px solid var(--line);
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--fg);
}

.related-links a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.how-to ol {
  padding-left: 20px;
}

.how-to li {
  margin-bottom: 8px;
  color: var(--fg-dim);
}

/* ---------- footer ---------- */

.site-footer {
  border-top: 1px solid var(--line);
  padding: 32px 0 18px;
}

.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.footer-links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13px;
}

.footer-links a {
  color: var(--fg-dim);
  text-decoration: none;
}

.footer-links a:hover {
  color: var(--fg);
}

.footer-tag {
  font-size: 12px;
  color: var(--fg-dim);
}

.erabbit-mark {
  display: block;
  width: 10px;
  margin: 14px 24px 0 auto;
  line-height: 0;
}

.erabbit-mark img {
  display: block;
  width: 10px;
  height: 10px;
}

/* ---------- simple content pages (privacy/terms/404) ---------- */

.doc-page {
  padding: 56px 0 60px;
  max-width: 720px;
}

.doc-page h1 {
  font-size: 2rem;
}

.doc-page h2 {
  font-size: 1.2rem;
  margin-top: 1.6em;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}