/* Poarta îngustă a memoriei — semantic tokens, dual theme. */

:root {
  color-scheme: light;
  --bg: #f4f1ea;
  --bg-raised: #fcfaf5;
  --bg-sunken: #e7e1d3;
  --fg: #1c1a17;
  --fg-soft: #46413a;
  --fg-faint: #524b41;
  --line: rgba(28, 26, 23, 0.16);
  --line-strong: rgba(28, 26, 23, 0.38);
  --shadow: rgba(28, 26, 23, 0.12);
  --accent: #2f4f9e;
  --accent-soft: #dfe6f7;
  --accent-ink: #1f3a7a;
  --on-accent: #ffffff;
  --link: #22408a;
  --signal: #a4471a;
  --signal-soft: #f7e3d6;
  --signal-ink: #7d3210;
  --gold: #8a6508;
  --gold-soft: #f4e9c8;
  --gold-ink: #5d4300;
  --focus: #2f4f9e;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, "Times New Roman", serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --container: 70ch;
  --wide: 1120px;
  --radius: 14px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --bg: #14161c;
    --bg-raised: #1c1f28;
    --bg-sunken: #0d0f14;
    --fg: #eeeae2;
    --fg-soft: #c9c3b8;
    --fg-faint: #b5ad9f;
    --line: rgba(238, 234, 226, 0.16);
    --line-strong: rgba(238, 234, 226, 0.4);
    --shadow: rgba(0, 0, 0, 0.55);
    --accent: #8fa8ec;
    --accent-soft: #1f2a48;
    --accent-ink: #b6c6f5;
    --on-accent: #0b1430;
    --link: #a3b8f4;
    --signal: #e6956a;
    --signal-soft: #3a2014;
    --signal-ink: #f2b590;
    --gold: #d9b24a;
    --gold-soft: #33290c;
    --gold-ink: #eacb7a;
    --focus: #a3b8f4;
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #14161c;
  --bg-raised: #1c1f28;
  --bg-sunken: #0d0f14;
  --fg: #eeeae2;
  --fg-soft: #c9c3b8;
  --fg-faint: #b5ad9f;
  --line: rgba(238, 234, 226, 0.16);
  --line-strong: rgba(238, 234, 226, 0.4);
  --shadow: rgba(0, 0, 0, 0.55);
  --accent: #8fa8ec;
  --accent-soft: #1f2a48;
  --accent-ink: #b6c6f5;
  --on-accent: #0b1430;
  --link: #a3b8f4;
  --signal: #e6956a;
  --signal-soft: #3a2014;
  --signal-ink: #f2b590;
  --gold: #d9b24a;
  --gold-soft: #33290c;
  --gold-ink: #eacb7a;
  --focus: #a3b8f4;
}

* { box-sizing: border-box; }

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

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 1.0625rem;
  line-height: 1.65;
}

h1, h2, h3, h4 { font-family: var(--serif); font-weight: 600; line-height: 1.2; }
a { color: var(--link); }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 3px; border-radius: 4px; }

.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; margin: -1px; padding: 0; border: 0;
  clip: rect(0 0 0 0); clip-path: inset(50%); overflow: hidden; white-space: nowrap;
}

.wrap { max-width: var(--container); margin-inline: auto; padding-inline: 1.25rem; }
.wrap-wide { max-width: var(--wide); margin-inline: auto; padding-inline: 1.25rem; }
p { margin: 0 0 1rem; }
.small { font-size: 0.9rem; color: var(--fg-soft); }

/* Top bar */

.topbar {
  display: flex; align-items: center; justify-content: space-between; gap: 1rem;
  max-width: var(--wide); margin-inline: auto; padding: 0.9rem 1.25rem; border-bottom: 1px solid var(--line);
}
.brand { font-family: var(--serif); font-size: 1.05rem; color: var(--fg); text-decoration: none; }
.topbar-tools { display: flex; align-items: center; gap: 0.75rem; }
.lang-switch { display: flex; gap: 0.25rem; }
.lang-switch a {
  padding: 0.3rem 0.6rem; border-radius: 8px; text-decoration: none; font-weight: 600; font-size: 0.9rem;
  color: var(--fg-soft); border: 1px solid transparent; min-height: 44px; display: inline-flex; align-items: center;
}
.lang-switch a[aria-current="page"] { color: var(--fg); border-color: var(--line-strong); background: var(--bg-raised); }
.theme-toggle {
  font: inherit; font-size: 0.9rem; font-weight: 600; color: var(--fg); background: var(--bg-raised);
  border: 1px solid var(--line-strong); border-radius: 999px; padding: 0.35rem 0.85rem; cursor: pointer; min-height: 44px;
}

/* Hero */

.hero { border-bottom: 1px solid var(--line); background: linear-gradient(to bottom, var(--accent-soft), transparent 24rem); }
.hero-inner { max-width: var(--container); margin-inline: auto; padding: 3rem 1.25rem 2.25rem; }
.kicker { font-size: 0.85rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase; color: var(--fg-soft); margin: 0 0 1rem; }
.hero h1 { font-size: clamp(2.3rem, 6.6vw, 3.9rem); margin: 0 0 1rem; }
.deck { font-size: 1.2rem; line-height: 1.6; color: var(--fg-soft); margin: 0 0 1.5rem; max-width: 60ch; }
.deck strong { color: var(--fg); }

.gate {
  display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; gap: 0.75rem;
  margin: 1.5rem 0 0; padding: 1rem 1.1rem; background: var(--bg-raised); border: 1px solid var(--line);
  border-radius: var(--radius); box-shadow: 0 1px 6px var(--shadow); font-size: 0.92rem;
}
.gate .room { display: grid; gap: 0.2rem; }
.gate .room b { font-family: var(--serif); font-size: 1.15rem; }
.gate .room span { color: var(--fg-soft); }
.gate .door {
  width: 2.6rem; height: 3.4rem; border: 2px solid var(--signal); border-bottom: 0; border-radius: 1.3rem 1.3rem 0 0;
  display: grid; place-items: end center; color: var(--signal-ink); font-family: var(--mono); font-size: 0.8rem; padding-bottom: 0.25rem;
}

/* Sections */

main section { padding-block: 2.75rem; }
main section + section { border-top: 1px solid var(--line); }
section h2 { font-size: clamp(1.55rem, 3.8vw, 2.15rem); margin: 0 0 0.75rem; }
section h3 { font-size: 1.25rem; margin: 1.5rem 0 0.5rem; }
.lede { font-size: 1.12rem; color: var(--fg-soft); max-width: 62ch; }

/* Cards and panels */

.panel {
  background: var(--bg-raised); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: 0 2px 14px var(--shadow); padding: 1.25rem; margin-top: 1.5rem; display: grid; gap: 1rem;
}
.panel h3 { margin: 0; }
.panel .hint { margin: 0; font-size: 0.92rem; color: var(--fg-soft); }

.btn {
  font: inherit; font-weight: 600; font-size: 0.95rem; color: var(--on-accent); background: var(--accent);
  border: 2px solid var(--accent); border-radius: 10px; padding: 0.55rem 1.1rem; cursor: pointer; min-height: 44px;
}
.btn.secondary { background: transparent; color: var(--accent-ink); }
.btn:disabled { opacity: 0.55; cursor: default; }
.btn-row { display: flex; flex-wrap: wrap; gap: 0.6rem; align-items: center; }

.stage {
  min-height: 6.5rem; display: grid; place-items: center; text-align: center; padding: 1rem;
  border: 1px dashed var(--line-strong); border-radius: 10px; background: var(--bg);
}
.stage .digits { font-family: var(--serif); font-size: clamp(2.6rem, 9vw, 4rem); letter-spacing: 0.12em; line-height: 1; }
.stage .prompt { font-size: 1rem; color: var(--fg-soft); margin: 0; }
.stage .big { font-family: var(--serif); font-size: clamp(1.6rem, 5vw, 2.2rem); margin: 0; }
.stage input {
  font: inherit; font-family: var(--mono); font-size: 1.5rem; letter-spacing: 0.15em; text-align: center; width: min(100%, 18rem);
  padding: 0.5rem 0.75rem; border: 2px solid var(--line-strong); border-radius: 10px; background: var(--bg-raised); color: var(--fg); min-height: 44px;
}
.result {
  border-left: 5px solid var(--accent); padding: 0.6rem 0.9rem; background: var(--bg); border-radius: 8px; font-size: 0.98rem;
}
.result[data-tone="signal"] { border-left-color: var(--signal); }
.result p { margin: 0 0 0.3rem; }
.result p:last-child { margin: 0; }
.progress { display: flex; gap: 0.35rem; flex-wrap: wrap; font-family: var(--mono); font-size: 0.8rem; color: var(--fg-soft); }
.progress span { padding: 0.1rem 0.45rem; border-radius: 6px; background: var(--bg-sunken); }
.progress span.ok { background: var(--accent-soft); color: var(--accent-ink); }
.progress span.miss { background: var(--signal-soft); color: var(--signal-ink); }

.chunk-demo { display: grid; gap: 0.75rem; }
.chunk-line { font-family: var(--serif); font-size: clamp(1.4rem, 5vw, 2rem); letter-spacing: 0.18em; text-align: center; margin: 0; word-break: break-all; }
.chunk-line.grouped { letter-spacing: 0.06em; word-spacing: 0.9em; word-break: normal; }

/* Charts */

.chart { margin-top: 1.25rem; }
.chart svg { width: 100%; height: auto; display: block; }
.chart .axis { stroke: var(--line-strong); stroke-width: 1; }
.chart .grid { stroke: var(--line); stroke-width: 1; }
.chart .tick { font-family: var(--sans); font-size: 11px; fill: var(--fg-soft); }
.chart .label { font-family: var(--sans); font-size: 12px; fill: var(--fg); font-weight: 600; }
.chart .series-a { fill: none; stroke: var(--accent); stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.chart .series-b { fill: none; stroke: var(--signal); stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; stroke-dasharray: 6 5; }
.chart .dot-a { fill: var(--accent); }
.chart .dot-b { fill: var(--signal); }
.chart .dot-outline { fill: var(--bg-raised); stroke: var(--signal); stroke-width: 2.5; }
.chart figcaption { font-size: 0.88rem; color: var(--fg-soft); margin-top: 0.5rem; }
.legend { display: flex; flex-wrap: wrap; gap: 1rem; font-size: 0.88rem; color: var(--fg-soft); margin: 0.5rem 0 0; }
.legend span { display: inline-flex; align-items: center; gap: 0.4rem; }
.legend i { display: inline-block; width: 1.4rem; height: 0; border-top: 3px solid var(--accent); }
.legend i.b { border-top-style: dashed; border-top-color: var(--signal); }

/* Bars */

.bars { display: grid; gap: 1.3rem; margin-top: 1.25rem; }
.bar-group { display: grid; gap: 0.45rem; }
.bar-group h4 { margin: 0; font-size: 1.02rem; }
.bar-group .src { font-size: 0.85rem; color: var(--fg-soft); margin: 0; }
.bar { display: grid; grid-template-columns: minmax(8rem, 13rem) 1fr auto; align-items: center; gap: 0.6rem; font-size: 0.9rem; }
.bar .bl { color: var(--fg-soft); }
.bar .bo { background: var(--bg-sunken); border-radius: 6px; height: 1.1rem; overflow: hidden; }
.bar .bf { height: 100%; border-radius: 6px 0 0 6px; background: var(--fg-faint); }
.bar.win .bf { background: var(--accent); }
.bar .bv { font-family: var(--mono); white-space: nowrap; }
@media (max-width: 480px) {
  .bar { grid-template-columns: 1fr auto; }
  .bar .bl { grid-column: 1 / -1; }
}

/* Spacing planner */

.planner { display: grid; gap: 1rem; }
.planner fieldset { border: 0; margin: 0; padding: 0; display: grid; gap: 0.5rem; }
.planner legend { font-weight: 700; font-size: 0.95rem; padding: 0; margin-bottom: 0.25rem; }
.planner .opts { display: grid; gap: 0.5rem; }
@media (min-width: 560px) { .planner .opts { grid-template-columns: repeat(4, 1fr); } }
.planner label {
  display: grid; gap: 0.15rem; border: 1px solid var(--line-strong); border-radius: 10px; padding: 0.6rem 0.75rem;
  cursor: pointer; font-size: 0.9rem; background: var(--bg-raised); min-height: 44px;
}
.planner label:has(input:checked) { border-color: var(--accent); border-width: 2px; padding: calc(0.6rem - 1px) calc(0.75rem - 1px); }
.planner input { accent-color: var(--accent); }
.planner .sub { color: var(--fg-soft); font-size: 0.8rem; }
.timeline { display: grid; gap: 0.4rem; }
.timeline .track { position: relative; height: 2.6rem; background: var(--bg-sunken); border-radius: 8px; }
.timeline .mark {
  position: absolute; top: 0; bottom: 0; width: 3px; background: var(--accent); border-radius: 2px; transform: translateX(-50%);
}
.timeline .mark.exam { background: var(--signal); }
.timeline .mark span {
  position: absolute; top: 100%; left: 50%; transform: translateX(-50%); white-space: nowrap; font-size: 0.78rem; color: var(--fg-soft); padding-top: 0.2rem;
}
.timeline .mark.exam span { color: var(--signal-ink); }
.timeline .mark.right span { left: auto; right: 0; transform: none; }
.timeline .mark.left span { left: 0; transform: none; }
.timeline .spacer { height: 1.4rem; }

/* Table */

.table-wrap { overflow-x: auto; margin-top: 1.25rem; }
table { border-collapse: collapse; width: 100%; font-size: 0.94rem; min-width: 30rem; }
th, td { text-align: left; padding: 0.55rem 0.7rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-weight: 700; color: var(--fg); }
.rate { font-size: 0.75rem; font-weight: 700; letter-spacing: 0.04em; text-transform: uppercase; border-radius: 6px; padding: 0.12rem 0.5rem; white-space: nowrap; }
.rate.high { color: var(--accent-ink); background: var(--accent-soft); }
.rate.mid { color: var(--gold-ink); background: var(--gold-soft); }
.rate.low { color: var(--signal-ink); background: var(--signal-soft); }

/* Archival figure */

.archival { margin: 1.5rem 0 0; display: grid; gap: 1rem; }
@media (min-width: 720px) { .archival { grid-template-columns: 14rem 1fr; align-items: start; } }
.archival figure { margin: 0; border: 1px solid var(--line); border-radius: var(--radius); overflow: hidden; background: var(--bg-raised); max-width: 16rem; }
.archival img { display: block; width: 100%; height: auto; }
.archival figcaption { padding: 0.7rem 0.85rem; font-size: 0.83rem; color: var(--fg-soft); border-top: 1px solid var(--line); }

/* Callouts and lists */

.callout { border: 1px solid var(--line-strong); border-radius: 10px; padding: 0.9rem 1.1rem; margin-top: 1.25rem; font-size: 0.96rem; background: var(--bg-raised); }
.callout--signal { background: var(--signal-soft); border-color: transparent; }
.callout--gold { background: var(--gold-soft); border-color: transparent; }
.rules { list-style: none; counter-reset: r; margin: 1rem 0 0; padding: 0; display: grid; gap: 0.8rem; }
.rules li { counter-increment: r; position: relative; padding: 0.9rem 1rem 0.9rem 3.4rem; border: 1px solid var(--line); border-radius: 10px; background: var(--bg-raised); }
.rules li::before {
  content: counter(r); position: absolute; left: 0.9rem; top: 0.9rem; width: 1.7rem; height: 1.7rem; border-radius: 50%;
  background: var(--accent); color: var(--on-accent); font-weight: 700; display: grid; place-items: center; font-size: 0.95rem;
}
.rules h3 { margin: 0 0 0.25rem; font-size: 1.1rem; }
.rules p { margin: 0; font-size: 0.96rem; }
.sources { padding-left: 1.2rem; font-size: 0.92rem; }
.sources li { margin-bottom: 0.5rem; }

footer { border-top: 1px solid var(--line); padding: 2rem 1.25rem 3rem; font-size: 0.9rem; color: var(--fg-soft); }
footer .wrap { display: grid; gap: 0.5rem; }
footer a { color: var(--link); }
.backtop { display: inline-block; margin-top: 0.5rem; }

/* Narrow screens */
@media (max-width: 560px) {
  .brand { white-space: nowrap; }
  .theme-toggle { font-size: 0.82rem; padding: 0.3rem 0.7rem; }
  .gate { grid-template-columns: 1fr; justify-items: start; }
  .gate .door { transform: rotate(90deg); justify-self: center; margin: -0.4rem 0; }
}
.chart { overflow-x: auto; }
.chart svg { min-width: 560px; }