/* cruciblevm.github.io — hand-crafted, no build step.
   Structure and color-scheme handling adapted from sitenetsoft.org.
   Order: tokens → base → layout → components → motion. */

/* ---------- tokens ---------- */
:root {
  color-scheme: light dark;

  /* primitive — crucible/branding/README.md */
  --iron: #44557a;
  --molten-hot: #ffd24a;
  --molten-mid: #ff8a1f;
  --molten-deep: #e0402a;
  --molten: linear-gradient(100deg, var(--molten-hot), var(--molten-mid) 50%, var(--molten-deep));

  /* semantic — light */
  --color-bg: #f7f8fa;
  --color-surface: #ffffff;
  --color-code: #eef1f6;
  --color-text: #161c2a;
  --color-muted: #525d73;
  --color-accent: #b23f1c; /* molten deepened for AA on light bg */
  --color-iron: var(--iron);
  --color-line: #dde2ea;
  --color-win: #2f7d55;
  --color-loss: #a14a0b;

  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-mono: ui-monospace, "Cascadia Code", "JetBrains Mono", Menlo, Consolas, monospace;

  --space-2: 0.5rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2.5rem;
  --space-6: 4.5rem;

  --radius: 0.625rem;
  --measure: 42rem;
  --page-max: 64rem;
}

/* Dark tokens apply when the OS prefers dark and the user hasn't forced light,
   or when the user forces dark via the toggle (data-theme set by assets/js/theme.js,
   persisted in localStorage "cruciblevm-color-scheme"). */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-bg: #0f131c;
    --color-surface: #171d29;
    --color-code: #1d2533;
    --color-text: #e7ebf2;
    --color-muted: #9aa5ba;
    --color-accent: #ff9a3c;
    --color-iron: #8f9fc2;
    --color-line: #263044;
    --color-win: #5cc28d;
    --color-loss: #f0a050;
  }
}

:root[data-theme="dark"] {
  --color-bg: #0f131c;
  --color-surface: #171d29;
  --color-code: #1d2533;
  --color-text: #e7ebf2;
  --color-muted: #9aa5ba;
  --color-accent: #ff9a3c;
  --color-iron: #8f9fc2;
  --color-line: #263044;
  --color-win: #5cc28d;
  --color-loss: #f0a050;
}

:root[data-theme="light"] { color-scheme: light; }
:root[data-theme="dark"] { color-scheme: dark; }

/* ---------- base ---------- */
* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: var(--font-body);
  line-height: 1.6;
  background: var(--color-bg);
  color: var(--color-text);
}

a {
  color: var(--color-accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 0.2em;
}

a:hover { text-decoration-thickness: 2px; }

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

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-code);
  padding: 0.1em 0.35em;
  border-radius: 0.3em;
  overflow-wrap: anywhere;
}

pre {
  margin: 0;
  padding: var(--space-3);
  background: var(--color-code);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow-x: auto;
  font-size: 0.875rem;
  line-height: 1.55;
}

pre code {
  padding: 0;
  background: none;
  font-size: inherit;
  overflow-wrap: normal;
}

pre .c { color: var(--color-muted); }

/* ---------- layout ---------- */
.hero,
.section {
  max-width: var(--page-max);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

/* ---------- hero ---------- */
.hero {
  text-align: center;
  padding-block: var(--space-6) var(--space-5);
}

.hero-logo {
  display: block;
  width: 7.5rem;
  height: auto;
  margin-inline: auto;
}

.hero-title {
  display: inline-flex;
  align-items: flex-start;
  gap: 0.4rem;
  margin: var(--space-3) 0 0;
  font-size: clamp(2.25rem, 6vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.alpha-tag {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #1a1206;
  background: var(--molten);
  padding: 0.15em 0.55em;
  border-radius: 999px;
}

.hero-tagline {
  margin: var(--space-2) 0 0;
  font-size: clamp(1.125rem, 2.5vw, 1.375rem);
  font-weight: 500;
  color: var(--color-accent);
}

.hero-intro {
  max-width: var(--measure);
  margin: var(--space-4) auto 0;
  color: var(--color-muted);
}

.hero-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.hero-note {
  max-width: var(--measure);
  margin: var(--space-3) auto 0;
  font-size: 0.9375rem;
  color: var(--color-muted);
}

.button {
  display: inline-block;
  padding: 0.55rem 1.1rem;
  border: 1px solid var(--color-line);
  border-radius: 999px;
  background: var(--color-surface);
  color: var(--color-text);
  font-weight: 600;
  font-size: 0.9375rem;
  text-decoration: none;
  transition: border-color 0.15s ease;
}

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

.button--primary {
  border-color: transparent;
  border-left-width: 0;
  border-right-width: 0;
  padding-inline: calc(1.1rem + 1px);
  background: var(--molten);
  color: #1a1206;
}

.button--primary:hover { border-color: transparent; filter: brightness(1.05); }

/* ---------- sections ---------- */
.section { padding-block: var(--space-5); }

.section-title {
  margin: 0;
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.section-note {
  margin: var(--space-2) 0 var(--space-4);
  max-width: var(--measure);
  color: var(--color-muted);
  font-size: 0.9375rem;
}

/* ---------- alpha notice ---------- */
.notice {
  max-width: var(--page-max);
  margin: 0 auto;
  padding-inline: var(--space-4);
}

.notice > div {
  padding: var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-left: 4px solid var(--molten-mid);
  border-radius: var(--radius);
  font-size: 0.9375rem;
}

.notice p { margin: 0; }
.notice strong { color: var(--color-accent); }

/* ---------- steps ---------- */
.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
  counter-reset: step;
}

.step {
  display: grid;
  grid-template-columns: 2.25rem 1fr;
  gap: var(--space-3);
  align-items: start;
  counter-increment: step;
}

.step::before {
  content: counter(step);
  display: grid;
  place-items: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 50%;
  background: var(--color-iron);
  color: var(--color-bg);
  font-weight: 700;
  font-family: var(--font-mono);
}

.step > div { min-width: 0; }

.step h3 {
  margin: 0.25rem 0 var(--space-2);
  font-size: 1.0625rem;
}

.step p {
  margin: 0 0 var(--space-2);
  color: var(--color-muted);
  font-size: 0.9375rem;
}

.after {
  margin-top: var(--space-4);
}

.after p {
  margin: 0 0 var(--space-2);
  color: var(--color-muted);
  font-size: 0.9375rem;
  max-width: var(--measure);
}

/* ---------- feature cards ---------- */
.card-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(17rem, 1fr));
  gap: var(--space-3);
}

.card-grid--pairs {
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 24rem), 1fr));
}

.card {
  padding: var(--space-3) var(--space-3) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.card-name {
  margin: 0 0 var(--space-2);
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-text);
}

.card-name::before {
  content: "";
  display: inline-block;
  width: 0.55em;
  height: 0.55em;
  margin-right: 0.5em;
  border-radius: 2px;
  background: var(--molten);
  vertical-align: 0.05em;
}

.card-desc {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-muted);
}

.card-link {
  margin: var(--space-2) 0 0;
  font-size: 0.9375rem;
  font-weight: 600;
}

/* ---------- comparison table ---------- */
.table-wrap {
  overflow-x: auto;
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

th,
td {
  padding: 0.65rem var(--space-3);
  text-align: left;
  border-bottom: 1px solid var(--color-line);
  white-space: nowrap;
}

tbody tr:last-child td { border-bottom: 0; }

th {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

td.num,
th.num {
  text-align: right;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

td:first-child { white-space: normal; min-width: 14rem; }

td.win { font-weight: 700; color: var(--color-text); }

td.result { font-weight: 600; color: var(--color-muted); }
tr[data-result="ahead"] td.result { color: var(--color-win); }
tr[data-result="behind"] td.result { color: var(--color-loss); }

.row-note {
  display: block;
  font-size: 0.8125rem;
  color: var(--color-muted);
}

tr.group th {
  padding-top: 1.1rem;
  background: var(--color-bg);
  color: var(--color-text);
  font-size: 0.8125rem;
}

tr.group th span {
  margin-left: 0.5em;
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  color: var(--color-muted);
}

.caveats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 22rem), 1fr));
  gap: var(--space-3);
  margin-top: var(--space-4);
}

.caveat {
  padding: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.caveat h3 {
  margin: 0 0 var(--space-2);
  font-size: 1rem;
}

.caveat p {
  margin: 0;
  font-size: 0.9375rem;
  color: var(--color-muted);
}

.fine-print {
  margin: var(--space-3) 0 0;
  color: var(--color-muted);
  font-size: 0.875rem;
}

/* ---------- theme toggle (from sitenetsoft.org) ---------- */
.theme-toggle {
  position: absolute;
  top: var(--space-3);
  right: var(--space-3);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  color: var(--color-muted);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: 50%;
  cursor: pointer;
}

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

/* one icon per scheme state; data-theme absent = system */
.theme-toggle svg { display: none; }

:root:not([data-theme]) .theme-toggle .icon-system,
:root[data-theme="light"] .theme-toggle .icon-light,
:root[data-theme="dark"] .theme-toggle .icon-dark { display: block; }

/* ---------- footer ---------- */
.site-footer {
  margin-top: var(--space-5);
  padding: var(--space-4);
  border-top: 1px solid var(--color-line);
  text-align: center;
  font-size: 0.875rem;
  color: var(--color-muted);
}

.site-footer p { margin: 0.25rem auto; max-width: var(--measure); }

/* ---------- motion ---------- */
@media (prefers-reduced-motion: no-preference) {
  .hero > * {
    animation: rise 0.5s ease-out backwards;
  }

  .hero > :nth-child(2) { animation-delay: 0.08s; }
  .hero > :nth-child(3) { animation-delay: 0.16s; }
  .hero > :nth-child(4) { animation-delay: 0.24s; }
  .hero > :nth-child(5) { animation-delay: 0.32s; }

  @keyframes rise {
    from {
      opacity: 0;
      translate: 0 0.75rem;
    }
  }
}

/* ---------- charts: one image per scheme ---------- */
.chart-figure {
  margin: var(--space-3) 0 0;
}

.chart-figure a {
  display: block;
  cursor: zoom-in;
}

.chart-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.chart-figure .chart-dark { display: none; }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .chart-figure .chart-light { display: none; }
  :root:not([data-theme="light"]) .chart-figure .chart-dark { display: block; }
}

:root[data-theme="dark"] .chart-figure .chart-light { display: none; }
:root[data-theme="dark"] .chart-figure .chart-dark { display: block; }

/* ---------- headline figures ---------- */
.sub-title {
  margin: var(--space-4) 0 var(--space-3);
  font-size: 1.0625rem;
  font-weight: 700;
}

.sub-title span {
  margin-left: 0.4em;
  font-size: 0.875rem;
  font-weight: 400;
  color: var(--color-muted);
}

.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 15rem), 1fr));
  gap: var(--space-3);
  margin: 0 0 var(--space-3);
}

.stats > div {
  padding: var(--space-3);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
}

.stats dt {
  font-size: 0.8125rem;
  color: var(--color-muted);
}

.stats dd { margin: 0; }

.stats dd strong {
  font-family: var(--font-mono);
  font-size: 1.75rem;
  font-variant-numeric: tabular-nums;
  color: var(--color-text);
}

.stats .stat-note {
  margin-top: 0.25rem;
  font-size: 0.8125rem;
  color: var(--color-muted);
}

.how-to-read {
  margin: 0 0 var(--space-3);
  max-width: var(--measure);
  color: var(--color-muted);
  font-size: 0.875rem;
}

/* narrow screens: let cells wrap so every column fits without scrolling */
@media (max-width: 40rem) {
  table { font-size: 0.8125rem; }

  th,
  td {
    padding: 0.55rem 0.5rem;
    white-space: normal;
  }

  td:first-child { min-width: 6.5rem; }

  th { font-size: 0.6875rem; letter-spacing: 0; }

  .row-note { font-size: 0.75rem; }
}

/* ---------- quick start ---------- */
.quick-start {
  margin-bottom: var(--space-4);
  padding: var(--space-3) var(--space-4) var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-line);
  border-left: 4px solid var(--molten-mid);
  border-radius: var(--radius);
}

.quick-start h3 {
  margin: 0.25rem 0 var(--space-2);
  font-size: 1.0625rem;
}

.quick-start p {
  margin: var(--space-2) 0 0;
  color: var(--color-muted);
  font-size: 0.9375rem;
}