/* s7udy public sites: s7udy.com, al.s7udy.com, ap.s7udy.com
   Concept: an exam paper and the examiner's red pen. See sites/README.md. */

@font-face {
  font-family: "Schibsted Grotesk";
  src: url("/assets/fonts/schibsted-grotesk-latin-wght-normal.woff2") format("woff2");
  font-weight: 400 900;
  font-style: normal;
  font-display: swap;
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC,
    U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215,
    U+FEFF, U+FFFD;
}

:root {
  --paper: #f4f5f1;
  --ink: #1c2333;
  --pencil: #646b78;
  --rule: #d8dcd3;
  --mark: #cf3a2e;
  --font: "Schibsted Grotesk", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC",
    "Microsoft YaHei", system-ui, sans-serif;
  --page: 72rem;
  --measure: 36rem;
  --gutter: clamp(1.25rem, 4vw, 3rem);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #12151b;
    --ink: #e7e9e3;
    --pencil: #9aa1ad;
    --rule: #2a2f38;
    --mark: #e5554a;
    color-scheme: dark;
  }
}

*, *::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);
  font-size: 1rem;
  line-height: 1.6;
  font-kerning: normal;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: inherit; text-underline-offset: 0.2em; text-decoration-thickness: 1px; }

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

.nobr { white-space: nowrap; }

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

/* Language: Chinese by default, English when <html data-lang="en">. */
.t-en { display: none; }
html[data-lang="en"] .t-en { display: revert; }
html[data-lang="en"] .t-zh { display: none; }

.wrap { max-width: var(--page); margin: 0 auto; padding: 0 var(--gutter); }

/* Top bar */
.topbar { display: flex; align-items: center; gap: 1.5rem; padding-block: 1.25rem; }
.brand {
  font-weight: 800; font-size: 1.3rem; letter-spacing: -0.03em;
  text-decoration: none; line-height: 1;
}
.brand-seven { color: var(--mark); }
.topbar-actions { margin-left: auto; display: flex; align-items: center; gap: 1.25rem; }

.lang { display: flex; gap: 0.15rem; }
.lang button {
  font: inherit; font-size: 0.9375rem; color: var(--pencil);
  background: none; border: 0; padding: 0.3rem 0.4rem; cursor: pointer; border-radius: 3px;
}
.lang button[aria-pressed="true"] { color: var(--ink); font-weight: 650; }

.button {
  display: inline-block; font: inherit; font-weight: 600; font-size: 0.9375rem; line-height: 1.2;
  padding: 0.7rem 1.1rem; border: 1.5px solid var(--ink); border-radius: 3px;
  color: var(--ink); background: transparent; text-decoration: none; white-space: nowrap;
}
.button:hover { background: var(--ink); color: var(--paper); }
.button.primary { background: var(--ink); color: var(--paper); }
.button.primary:hover { background: transparent; color: var(--ink); }
.button.quiet { border-color: var(--rule); }
.button.quiet:hover { border-color: var(--ink); }

/* The circled mark: one pen stroke, drawn once on load. */
.circled { position: relative; display: inline-block; }
.pen {
  position: absolute; left: -30%; top: -12%; width: 160%; height: 126%;
  overflow: visible; pointer-events: none;
}
.pen path {
  fill: none; stroke: var(--mark); stroke-width: 3.6;
  stroke-linecap: round; stroke-linejoin: round;
  stroke-dasharray: 1; stroke-dashoffset: 0;
}
.pen.partial path { stroke-dashoffset: 0.36; }
@media (prefers-reduced-motion: no-preference) {
  .pen path { stroke-dashoffset: 1; animation: pen-full 1s cubic-bezier(0.55, 0.05, 0.3, 1) 0.35s forwards; }
  .pen.partial path { animation-name: pen-partial; }
}
@keyframes pen-full { to { stroke-dashoffset: 0; } }
@keyframes pen-partial { to { stroke-dashoffset: 0.36; } }

/* Hero */
.hero { padding-block: clamp(2rem, 7vw, 5.5rem) clamp(0.5rem, 2vw, 1.5rem); }
.wordmark {
  font-size: clamp(5.25rem, 19vw, 16rem); font-weight: 850; letter-spacing: -0.06em;
  line-height: 0.88; margin: 0 0 clamp(2rem, 5vw, 3.25rem) -0.05em;
}
.hero-copy { display: grid; gap: 1.25rem; border-top: 1.5px solid var(--ink); padding-top: 1.5rem; }
.lede {
  font-size: clamp(1.75rem, 3.8vw, 2.75rem); font-weight: 700; line-height: 1.22;
  letter-spacing: -0.02em; margin: 0; max-width: 16em;
}
.lede .t-zh { letter-spacing: 0.01em; }
.sub { font-size: 1.0625rem; line-height: 1.8; color: var(--pencil); margin: 0; max-width: var(--measure); }
@media (min-width: 60rem) {
  .hero-copy { grid-template-columns: 1.15fr 1fr; gap: 3rem; align-items: end; }
}

/* Sections */
.section { padding-block: clamp(2.5rem, 6vw, 4.5rem); }
.section-h { font-size: 1.3rem; font-weight: 700; letter-spacing: -0.01em; margin: 0 0 1.25rem; }

/* Curricula: one examiner's mark box per curriculum */
.papers {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(3, 1fr);
  border-top: 1.5px solid var(--ink);
}
.paper {
  display: flex; flex-direction: column; align-items: flex-start;
  padding: 2rem clamp(1rem, 2.5vw, 2.25rem) 2.25rem;
  border-left: 1px solid var(--rule);
}
.paper:first-child { border-left: 0; padding-left: 0; }
.markbox {
  position: relative; display: grid; place-items: center;
  width: clamp(5.5rem, 9vw, 7rem); aspect-ratio: 1;
  border: 2px solid var(--ink); margin-bottom: 1.5rem;
}
.markbox .mark { font-size: clamp(3rem, 5.4vw, 4.25rem); font-weight: 800; letter-spacing: -0.05em; line-height: 1; }
.markbox .tick { position: absolute; right: -1.1rem; top: -1.2rem; width: 2.6rem; height: 2.6rem; }
.tick path { fill: none; stroke: var(--mark); stroke-width: 3.2; stroke-linecap: round; stroke-linejoin: round; }
.paper.is-soon .markbox { border-style: dashed; border-color: var(--pencil); }
.paper.is-soon .mark { color: var(--pencil); }
.paper h3 { font-size: 1.5rem; font-weight: 700; letter-spacing: -0.015em; margin: 0 0 0.3rem; }
.mark-note { color: var(--pencil); font-size: 0.9375rem; margin: 0 0 1.25rem; }
.status { margin: 0 0 1.75rem; font-size: 1rem; line-height: 1.65; }
.status strong { font-weight: 650; }
.paper.is-soon .status { color: var(--pencil); }
.paper .button { margin-top: auto; }

/* The loop */
.steps {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(5, 1fr);
  border-top: 1.5px solid var(--ink);
}
.steps li { padding: 1.25rem 1.5rem 0 0; }
.step-n { display: block; font-weight: 700; font-size: 0.9375rem; color: var(--pencil); margin-bottom: 0.5rem; font-variant-numeric: tabular-nums; }
.steps h3 { font-size: 1.25rem; font-weight: 700; margin: 0 0 0.35rem; }
.steps p { margin: 0; font-size: 0.9375rem; line-height: 1.7; color: var(--pencil); }
.loop-annot { display: grid; grid-template-columns: repeat(5, 1fr); margin-top: 1.25rem; }
.loop-annot .bracket {
  grid-column: 3 / 6; height: 0.85rem; margin-right: 1.5rem;
  border: 2px solid var(--mark); border-top: 0; border-radius: 0 0 8px 8px;
}
.loop-annot p { grid-column: 3 / 6; margin: 0.6rem 0 0; color: var(--mark); font-weight: 600; font-size: 0.9375rem; }
@media (max-width: 56rem) {
  .steps { grid-template-columns: repeat(2, 1fr); row-gap: 1.75rem; }
  .loop-annot { display: block; }
  .loop-annot .bracket { display: none; }
  .loop-annot p { margin-top: 0; }
}
@media (max-width: 34rem) { .steps { grid-template-columns: 1fr; } }

/* Footer */
.foot {
  display: flex; flex-wrap: wrap; gap: 0.5rem 2rem; align-items: baseline;
  border-top: 1px solid var(--rule); padding-top: 1.5rem; padding-bottom: 2.5rem;
  color: var(--pencil); font-size: 0.9375rem;
}
.foot p { margin: 0; }
.foot .copy { margin-left: auto; }

/* Coming-soon pages */
.soon { padding-block: clamp(2rem, 8vw, 6rem) clamp(3rem, 8vw, 6rem); }
.soon-copy { border-top: 1.5px solid var(--ink); padding-top: 1.5rem; }
.soon-mark {
  font-size: clamp(7.5rem, 30vw, 17rem); font-weight: 850; letter-spacing: -0.06em;
  line-height: 0.85; color: var(--pencil); margin: 0 0 clamp(2rem, 6vw, 3.5rem) 0.18em;
}
.soon-mark .pen { left: -22%; top: -14%; width: 144%; height: 128%; }
.soon h1 {
  font-size: clamp(1.75rem, 4vw, 2.75rem); font-weight: 700; line-height: 1.22;
  letter-spacing: -0.02em; margin: 0 0 1rem; max-width: 18em;
}
.soon .mark-note { margin-bottom: 1.5rem; }
.soon .sub { margin-bottom: 2rem; }
.actions { display: flex; flex-wrap: wrap; gap: 0.75rem; margin: 0 0 2.5rem; }
.notify { margin: 0; font-size: 1rem; }

@media (max-width: 47.99rem) {
  .papers { grid-template-columns: 1fr; }
  .paper { border-left: 0; border-top: 1px solid var(--rule); padding-left: 0; padding-right: 0; }
  .paper:first-child { border-top: 0; }
  .foot .copy { margin-left: 0; }
  .topbar { gap: 1rem; }
  .topbar-actions { gap: 0.75rem; }
}
@media (max-width: 26rem) {
  .topbar .button { padding: 0.6rem 0.8rem; }
}