/* Rancho MATHCOUNTS — the whole stylesheet.
   Single source of truth: build.py also wraps this file into Stylesheet.html
   for the Google Apps Script fallback. Edit here, never there. */

/* ---------- tokens ---------- */
:root {
  --paper: #fbf7ef;
  --paper-deep: #f2ece0;
  --ink: #132749;
  --ink-muted: #5a6580;
  --rule: #d9d2c4;
  --rule-strong: #132749;
  --gold: #fdb717;
  --focus: #132749;
  --danger: #a3281e;
  --success: #1f6b4a;

  /* Fixed brand pair for blocks that keep navy-on-gold or gold-on-navy in
     both themes. These deliberately do NOT flip in dark mode. */
  --brand-navy: #132749;
  --brand-gold: #fdb717;

  /* Lets the UA draw form controls, including the time picker's clock icon,
     to match the active theme instead of always light. */
  color-scheme: light dark;

  --font-display: Georgia, "Noto Serif", "Liberation Serif", "Times New Roman", serif;
  --font-body: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, "SF Mono", "Cascadia Mono", Consolas, monospace;

  --text-xs: .8125rem;
  --text-sm: .9375rem;
  --text-base: 1.0625rem;
  --text-lg: 1.3125rem;
  --text-xl: 1.6875rem;
  --text-2xl: clamp(2rem, 4vw, 2.625rem);
  --text-3xl: clamp(2.75rem, 8vw, 4.5rem);

  --measure: 34rem;
  --column: 46rem;
  --gutter: 1rem;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #132749;
    --paper-deep: #1b3159;
    --ink: #fbf7ef;
    --ink-muted: #a8b2c6;
    --rule: #2d4270;
    --rule-strong: #fbf7ef;
    --focus: #fdb717;
    --danger: #ff9d92;
    --success: #7fd3a8;
  }
}

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

:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #132749;
  --paper-deep: #1b3159;
  --ink: #fbf7ef;
  --ink-muted: #a8b2c6;
  --rule: #2d4270;
  --rule-strong: #fbf7ef;
  --focus: #fdb717;
  --danger: #ff9d92;
  --success: #7fd3a8;
}

/* CJK stacks. Georgia has no CJK coverage, so the display role changes too. */
:lang(zh) {
  --font-display: "Songti SC", "Source Han Serif SC", "Noto Serif CJK SC", serif;
  --font-body: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", sans-serif;
}

:lang(ko) {
  --font-display: "Apple SD Gothic Neo", Pretendard, "Malgun Gothic", "Noto Sans CJK KR", sans-serif;
  --font-body: "Apple SD Gothic Neo", Pretendard, "Malgun Gothic", "Noto Sans CJK KR", sans-serif;
}

:lang(zh) p, :lang(ko) p,
:lang(zh) li, :lang(ko) li { line-height: 1.85; }

:lang(zh) em, :lang(zh) i, :lang(zh) cite,
:lang(ko) em, :lang(ko) i, :lang(ko) cite {
  font-style: normal;
  font-weight: 700;
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.65;
  overflow-wrap: break-word;
}

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 400;
  line-height: 1.15;
  letter-spacing: -.02em;
  text-wrap: balance;
  margin: 0;
}

:lang(zh) h1, :lang(zh) h2, :lang(zh) h3,
:lang(ko) h1, :lang(ko) h2, :lang(ko) h3 { letter-spacing: 0; }

p { text-wrap: pretty; }

img { max-width: 100%; height: auto; display: block; }

a { color: inherit; }

:focus-visible {
  outline: 2px solid var(--focus);
  outline-offset: 2px;
}

.wrap {
  max-width: var(--column);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.measure { max-width: var(--measure); }

.skip {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--paper);
  color: var(--ink);
  padding: .75rem 1rem;
  z-index: 10;
}
.skip:focus { left: 0; }

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

/* ---------- language blocks (mechanism B) ---------- */
/* Every variant is hidden by an author rule; `revert` restores the UA display
   value for the active one, so <p> becomes block and <span> becomes inline.
   Never add the `hidden` attribute here — `revert` would roll back into it. */
.i18n > * { display: none; }
[data-lang="en"] .i18n > [lang|="en"],
[data-lang="zh"] .i18n > [lang|="zh"],
[data-lang="ko"] .i18n > [lang|="ko"] { display: revert; }

/* ---------- navigation ---------- */
.nav {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem 1.5rem;
  padding-block: 1rem;
  border-bottom: 1px solid var(--rule);
  font-weight: 600;
}

.nav__brand {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  gap: .5rem;
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 700;
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 3px solid transparent;
}

.nav__brand svg { width: 28px; height: 28px; flex: none; }

.nav__links { display: flex; gap: 1.5rem; }

.nav a:not(.nav__brand) {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font-size: var(--text-sm);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 3px solid transparent;
}

.nav a[aria-current="page"] { border-bottom-color: var(--gold); }

.nav__langs {
  margin-inline-start: auto;
  display: flex;
  align-items: center;
  gap: .5rem;
}

.nav__langs button {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  font: inherit;
  font-size: var(--text-sm);
  font-weight: 600;
  color: inherit;
  background: none;
  border: 0;
  /* Square, like every other rule on the site. A pill radius bends the gold
     marker into a curve and it stops matching the nav links. */
  border-radius: 0;
  padding: 0 .5rem;
  cursor: pointer;
  border-bottom: 3px solid transparent;
  transition: border-color 120ms, color 120ms;
}

.nav__langs button[aria-pressed="true"] { border-bottom-color: var(--gold); }

/* ---------- hero ---------- */
.hero { padding-block: 3rem 2.5rem; }

.hero__sub {
  font-size: var(--text-sm);
  color: var(--ink-muted);
  margin: 0 0 .5rem;
}

.hero h1 { font-size: var(--text-3xl); }

.hero__line {
  width: max-content;
  max-width: 100%;
  border-bottom: 3px solid var(--gold);
  margin-block: .75rem 1.5rem;
  padding-inline-end: 4rem;
}

.hero__lede { font-size: var(--text-lg); max-width: var(--measure); margin: 0; }

/* ---------- announcement ---------- */
.announce {
  background: var(--paper-deep);
  border-left: 3px solid var(--gold);
  padding: 1.5rem 1.75rem;
  margin-block: 0 3rem;
  font-size: var(--text-lg);
}

.announce p { margin: 0; max-width: var(--measure); }

/* ---------- statistics ---------- */
.stats {
  display: flex;
  flex-wrap: wrap;
  gap: 3rem;
  padding-block: 3rem;
  border-top: 1px solid var(--rule);
}

.stats__value {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  line-height: 1;
}

.stats__label {
  font-size: var(--text-sm);
  color: var(--ink-muted);
  margin-top: .5rem;
}

@media (max-width: 40rem) { .stats { flex-direction: column; gap: 2rem; } }

/* ---------- figures ---------- */
.essay { padding-block: 3rem; border-top: 1px solid var(--rule); }

.essay h2 { font-size: var(--text-xl); margin-bottom: .25rem; }

.essay__date {
  font-size: var(--text-sm);
  color: var(--ink-muted);
  margin: 0 0 1.5rem;
}

.essay p { max-width: var(--measure); }

figure { margin: 0 0 2rem; }

figure img { border: 1px solid var(--rule-strong); }

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) figure img { border-color: transparent; }
}

/* The caption sits inside the photograph, on a half-opaque navy field.
   Both colours are fixed: the plate has to work over an unknown image in
   either theme, and paper on 65% navy stays comfortably readable. */
.essay figure { position: relative; }

.essay figcaption {
  position: absolute;
  left: 1px;
  right: 1px;
  bottom: 1px;
  margin: 0;
  padding: .5rem .875rem .625rem;
  background: rgba(19, 39, 73, .65);
  color: #fbf7ef;
  font-size: var(--text-sm);
}

/* ---------- FAQ ---------- */
.faq { padding-block: 3rem; border-top: 1px solid var(--rule); }

.faq h2 { font-size: var(--text-xl); margin-bottom: 1.5rem; }

.faq details { border-top: 1px solid var(--rule); }
.faq details:last-of-type { border-bottom: 1px solid var(--rule); }

.faq summary {
  cursor: pointer;
  padding: .875rem 0;
  list-style: none;
  display: flex;
  align-items: center;
  gap: .875rem;
}

.faq summary::-webkit-details-marker { display: none; }

.faq summary::before {
  content: "";
  flex: none;
  width: .45rem;
  height: .45rem;
  margin-inline-start: .15rem;
  border-right: 3px solid var(--gold);
  border-bottom: 3px solid var(--gold);
  transform: rotate(-45deg);
  transition: transform 120ms;
}

.faq details[open] summary::before { transform: rotate(45deg); }

.faq details .i18n > p { margin: 0 0 1rem 1.85rem; max-width: var(--measure); }

/* ---------- prose (resources, tryouts, 404) ---------- */
.prose { padding-block: 3rem 5rem; }

.prose > * { max-width: var(--measure); }

.prose h1 { font-size: var(--text-2xl); }

.prose h1 + p { margin-top: 1.5rem; }

.prose h2 {
  font-size: var(--text-xl);
  margin-top: 3rem;
  margin-bottom: 1rem;
}

/* Gold on navy is 8.5:1, so gold may be a letterform here even in light
   mode. Both colours are fixed so the block reads the same in dark mode. */
.prose h2 code {
  background: var(--brand-navy);
  color: var(--brand-gold);
  font-family: inherit;
  font-size: inherit;
  font-weight: inherit;
  padding: .05em .4em .15em;
}

.prose a {
  text-decoration: underline;
  text-decoration-color: var(--rule-strong);
  text-decoration-thickness: 1px;
  text-underline-offset: .12em;
}

.prose a:hover,
.prose a:focus-visible {
  text-decoration-color: var(--gold);
  text-decoration-thickness: 2px;
}

.prose ul { list-style: none; padding-left: 1.25rem; }

.prose li { position: relative; margin-bottom: .5rem; }

.prose li::before {
  content: "–";
  position: absolute;
  left: -1.25rem;
  color: var(--gold);
}

.prose code {
  font-family: var(--font-mono);
  font-size: .9em;
  background: var(--paper-deep);
  padding: .1em .35em;
}

/* ---------- check-in ---------- */
.checkin { padding-block: 3rem 5rem; max-width: var(--measure); }

.checkin h1 { font-size: var(--text-2xl); margin-bottom: 1.5rem; }

/* Focus moves here so screen readers follow the step change. These headings
   are never reachable by Tab, so the ring would only ever confuse. */
.checkin h1[tabindex="-1"]:focus { outline: none; }

.checkin fieldset,
.checkin .field { border: 0; padding: 0; margin: 0 0 2rem; }

.checkin legend {
  padding: 0;
  margin-bottom: .75rem;
  font-size: var(--text-sm);
  color: var(--ink-muted);
}

.boxes { display: flex; gap: .25rem; }

.boxes--id .boxes__group { display: flex; gap: .25rem; }
.boxes--id { gap: .75rem; }

.boxes input {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-lg);
  text-align: center;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: 4px;
  height: 48px;
  width: clamp(1.6rem, 7.5vw, 2.75rem);
  padding: 0;
  transition: border-color 120ms;
}

.boxes input:focus { border-color: var(--rule-strong); }

/* Nine boxes cannot each be 44px wide at 320px. Height carries the touch
   target; width is as generous as the viewport allows. */

.checkin label { display: block; font-size: var(--text-sm); color: var(--ink-muted); margin-bottom: .5rem; }

.checkin textarea,
.checkin input[type="text"].plain {
  font: inherit;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--rule);
  border-radius: 0;
  padding: .625rem .75rem;
  width: 100%;
}

.checkin textarea { min-height: 6rem; resize: vertical; }

.checkin .leaving {
  display: flex;
  align-items: center;
  gap: .5rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}
.checkin .leaving label { margin: 0; }
.checkin .leaving input[type="checkbox"] { width: 1.25rem; height: 1.25rem; accent-color: var(--gold); }
.checkin .leaving input[type="time"] {
  font: inherit;
  color: var(--ink);
  background: transparent;
  border: 1px solid var(--rule);
  padding: .35rem .5rem;
  min-height: 44px;
}

/* Chrome draws the clock glyph as a dark bitmap regardless of color-scheme. */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) input[type="time"]::-webkit-calendar-picker-indicator {
    filter: invert(1);
  }
}

:root[data-theme="dark"] input[type="time"]::-webkit-calendar-picker-indicator {
  filter: invert(1);
}

.btn {
  font: inherit;
  font-weight: 600;
  color: #132749;
  background: var(--gold);
  border: 0;
  border-radius: 0;
  padding: .875rem 2rem;
  min-height: 48px;
  cursor: pointer;
  transition: opacity 120ms;
}

.btn:hover { opacity: .85; }
.btn[disabled] { opacity: .5; cursor: default; }

@media (max-width: 30rem) { .btn { width: 100%; } }

.error { color: var(--danger); font-size: var(--text-sm); margin-top: .75rem; }
.error:empty { display: none; }

.hint { font-size: var(--text-xs); color: var(--ink-muted); margin-top: .75rem; }

.hint button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
  text-decoration: underline;
}

.result__line { border-top: 3px solid var(--gold); margin-block: 1.5rem; }

/* ---------- footer ---------- */
.footer {
  border-top: 1px solid var(--rule);
  padding-block: 2rem 3rem;
  font-size: var(--text-sm);
  color: var(--ink-muted);
}

.footer p { margin: 0; }

/* ---------- motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    transition-duration: .001ms !important;
  }
}