/* ReLEAF · Plant Judging Prep — base
 * White paper, San Francisco type, hairline rules.
 * Accents are the iGEM Grand Jamboree 2026 tones: iGEM green, jamboree blue,
 * jamboree navy and the orange of the floating shapes.
 */

:root {
  --font-text: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue",
               "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", sans-serif;
  --font-display: -apple-system, BlinkMacSystemFont, "SF Pro Display", "Helvetica Neue",
               "PingFang TC", "Noto Sans TC", sans-serif;
  --font-mono: ui-monospace, "SF Mono", SFMono-Regular, Menlo, monospace;

  --paper: #ffffff;
  --paper-2: #f5f5f7;
  --paper-3: #fafafa;
  --ink: #0d1117;
  --ink-2: #3b4250;
  --muted: #6b7280;
  --faint: #8b93a1;
  --rule: #d4d7de;
  --rule-soft: #e8eaef;

  /* iGEM Jamboree 2026 */
  --green: #5aaa47;          /* iGEM green, the Jamboree call-to-action */
  --green-ink: #336b27;      /* readable green for type */
  --green-wash: #eef6ea;
  --blue: #0167ef;           /* Jamboree blue */
  --blue-ink: #0b4fb0;
  --blue-wash: #e9f1ff;
  --navy: #00061c;           /* Jamboree deep navy */
  --navy-2: #0e1733;
  --orange: #ea580c;
  --orange-ink: #a63d06;
  --orange-wash: #fdf0e7;
  --red: #c7352c;
  --red-wash: #fdecea;
  --violet: #6b47c4;
  --violet-wash: #f1ecfc;
  --amber: #b25000;
  --amber-wash: #fdf0e4;

  --accent: var(--green);
  --accent-deep: var(--green-ink);
  --accent-wash: var(--green-wash);

  --r-sm: 10px;
  --r: 14px;
  --r-lg: 20px;
  --r-xl: 28px;

  --shadow-1: 0 1px 2px rgba(0,0,0,.04), 0 4px 14px rgba(0,0,0,.05);
  --shadow-2: 0 2px 6px rgba(0,0,0,.06), 0 16px 40px rgba(0,0,0,.08);

  --nav-h: 52px;
  --page: 1120px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: calc(var(--nav-h) + 16px); }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-text);
  font-size: 17px;
  line-height: 1.55;
  letter-spacing: -.011em;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4 { font-family: var(--font-display); letter-spacing: -.022em; line-height: 1.12; margin: 0; font-weight: 600; }
h1 { font-size: clamp(2.1rem, 1.5rem + 2.6vw, 3.25rem); letter-spacing: -.03em; }
h2 { font-size: clamp(1.5rem, 1.2rem + 1.2vw, 2.05rem); }
h3 { font-size: 1.2rem; }
h4 { font-size: 1rem; }
p { margin: 0 0 1em; }
a { color: var(--green-ink); text-decoration: none; }
a:hover { text-decoration: underline; }
small { font-size: .8125rem; }
hr { border: 0; border-top: 1px solid var(--rule-soft); margin: 2.5rem 0; }

:focus-visible { outline: 2px solid var(--blue); outline-offset: 3px; border-radius: 6px; }

/* ── Nav ── */
.nav {
  position: sticky; top: 0; z-index: 60;
  height: var(--nav-h);
  background: rgba(255,255,255,.82);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--rule-soft);
}
.nav-in {
  max-width: var(--page); margin: 0 auto; height: 100%;
  display: flex; align-items: center; gap: 1.1rem; padding: 0 20px;
}
.nav-brand {
  font-weight: 600; font-size: .9375rem; color: var(--ink); letter-spacing: -.01em;
  display: flex; align-items: center; gap: .45rem; flex: none;
}
.nav-brand .leaf { width: 17px; height: 17px; flex: none; }
.nav-links { display: flex; gap: .15rem; overflow-x: auto; scrollbar-width: none; flex: 1; }
.nav-links::-webkit-scrollbar { display: none; }
.nav-links a {
  color: var(--ink-2); font-size: .8125rem; white-space: nowrap;
  padding: .3rem .5rem; border-radius: 7px; text-decoration: none;
}
.nav-links a:hover { background: var(--paper-2); text-decoration: none; }
.nav-links a[aria-current="page"] { color: var(--ink); font-weight: 600; background: var(--paper-2); }
.lang {
  flex: none; display: flex; background: var(--paper-2); border-radius: 999px; padding: 2px;
  border: 1px solid var(--rule-soft);
}
.lang button {
  border: 0; background: none; font: inherit; font-size: .75rem; font-weight: 600;
  color: var(--muted); padding: .2rem .62rem; border-radius: 999px; cursor: pointer;
  font-family: var(--font-text);
}
.lang button[aria-pressed="true"] { background: #fff; color: var(--ink); box-shadow: 0 1px 3px rgba(0,0,0,.09); }

/* ── Layout ── */
.wrap { max-width: var(--page); margin: 0 auto; padding: 0 20px; }
.narrow { max-width: 780px; }
section { padding: 3.25rem 0; }
section + section { border-top: 1px solid var(--rule-soft); }
.hero { padding: 3.75rem 0 2.75rem; }
.eyebrow { color: var(--green-ink); font-weight: 600; font-size: .8125rem; letter-spacing: .04em; text-transform: uppercase; margin-bottom: .7rem; }
.eyebrow-b { color: var(--blue-ink); }
.eyebrow-o { color: var(--orange-ink); }
.lede { font-size: 1.1875rem; color: var(--ink-2); line-height: 1.5; }
.lede-sm { font-size: 1.0625rem; color: var(--muted); }
.sec-head { margin-bottom: 1.6rem; }
.sec-head p { color: var(--muted); margin: .5rem 0 0; }

.grid { display: grid; gap: 1rem; }
.g2 { grid-template-columns: repeat(2, minmax(0,1fr)); }
.g3 { grid-template-columns: repeat(3, minmax(0,1fr)); }
.g4 { grid-template-columns: repeat(4, minmax(0,1fr)); }
@media (max-width: 900px) { .g3, .g4 { grid-template-columns: repeat(2, minmax(0,1fr)); } }
@media (max-width: 620px) { .g2, .g3, .g4 { grid-template-columns: 1fr; } }

/* ── Cards ── */
.card {
  background: var(--paper); border: 1px solid var(--rule-soft); border-radius: var(--r);
  padding: 1.15rem 1.25rem;
}
.card-soft { background: var(--paper-3); border-color: transparent; }
.card-2 { background: var(--paper-2); border: 0; border-radius: var(--r-lg); padding: 1.5rem; }
.card h3, .card h4 { margin-bottom: .4rem; }
.card p:last-child { margin-bottom: 0; }

.tile {
  display: block; background: var(--paper-2); border-radius: var(--r-lg); padding: 1.4rem;
  color: var(--ink); text-decoration: none; border: 1px solid transparent;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.tile:hover { text-decoration: none; background: #fff; border-color: var(--rule-soft); box-shadow: var(--shadow-2); transform: translateY(-2px); }
.tile .n { font-family: var(--font-mono); font-size: .6875rem; color: var(--faint); letter-spacing: .04em; }
.tile h3 { margin: .45rem 0 .35rem; }
.tile p { color: var(--muted); font-size: .9375rem; margin: 0; }

/* ── Bits ── */
.pill {
  display: inline-flex; align-items: center; gap: .3rem;
  font-size: .6875rem; font-weight: 600; letter-spacing: .01em;
  padding: .2rem .5rem; border-radius: 999px; background: var(--paper-2); color: var(--muted);
  white-space: nowrap;
}
.pill-a { background: var(--green-wash); color: var(--green-ink); }
.pill-b { background: var(--blue-wash); color: var(--blue-ink); }
.pill-w { background: var(--amber-wash); color: var(--amber); }
.pill-o { background: var(--orange-wash); color: var(--orange-ink); }
.pill-r { background: var(--red-wash); color: var(--red); }
.pill-v { background: var(--violet-wash); color: var(--violet); }
.pill-line { background: none; border: 1px solid var(--rule); color: var(--muted); }
.pill-navy { background: var(--navy); color: #fff; }

.btn {
  font: inherit; font-size: .9375rem; font-weight: 500; font-family: var(--font-text);
  background: var(--ink); color: #fff; border: 0; border-radius: 999px;
  padding: .55rem 1.25rem; cursor: pointer; text-decoration: none; display: inline-flex;
  align-items: center; gap: .4rem; transition: opacity .15s, background .15s;
}
.btn:hover { opacity: .88; text-decoration: none; }
.btn-accent { background: var(--green); }
.btn-blue { background: var(--blue); }
.btn-ghost { background: var(--paper-2); color: var(--ink); }
.btn-line { background: none; color: var(--ink); border: 1px solid var(--rule); }
.btn:disabled { opacity: .4; cursor: default; }
.btn-sm { font-size: .8125rem; padding: .38rem .9rem; }
.btn-row { display: flex; flex-wrap: wrap; gap: .6rem; align-items: center; }

.search {
  width: 100%; font: inherit; font-size: 1.0625rem; font-family: var(--font-text);
  padding: .8rem 1rem .8rem 2.6rem; border-radius: 999px;
  border: 1px solid var(--rule); background: var(--paper-2) no-repeat .95rem 50%;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='17' height='17' viewBox='0 0 24 24' fill='none' stroke='%236b7280' stroke-width='2.2' stroke-linecap='round'%3E%3Ccircle cx='11' cy='11' r='7'/%3E%3Cpath d='M16.5 16.5 21 21'/%3E%3C/svg%3E");
  color: var(--ink);
}
.search:focus { background-color: #fff; border-color: #b9bcc4; outline: none; box-shadow: 0 0 0 4px rgba(1,103,239,.14); }

.chips { display: flex; flex-wrap: wrap; gap: .4rem; }
.chip {
  font: inherit; font-family: var(--font-text); font-size: .8125rem; font-weight: 500;
  border: 1px solid var(--rule-soft); background: var(--paper-2); color: var(--ink-2);
  padding: .32rem .75rem; border-radius: 999px; cursor: pointer; white-space: nowrap;
}
.chip[aria-pressed="true"] { background: var(--navy); color: #fff; border-color: var(--navy); }
.chip .c { color: var(--faint); font-size: .75rem; margin-left: .3rem; }
.chip[aria-pressed="true"] .c { color: rgba(255,255,255,.62); }

.stat { font-family: var(--font-display); font-size: 1.75rem; font-weight: 600; letter-spacing: -.02em; }
.stat-l { font-size: .8125rem; color: var(--muted); }

.src { font-family: var(--font-mono); font-size: .6875rem; color: var(--faint); }
.src a { color: var(--faint); }

details.d { border-top: 1px solid var(--rule-soft); padding: .85rem 0; }
details.d > summary { cursor: pointer; font-weight: 500; list-style: none; display: flex; gap: .6rem; align-items: baseline; }
details.d > summary::-webkit-details-marker { display: none; }
details.d > summary::before { content: "+"; color: var(--faint); font-family: var(--font-mono); flex: none; }
details.d[open] > summary::before { content: "−"; }

.note { background: var(--paper-2); border-radius: var(--r); padding: 1rem 1.15rem; font-size: .9375rem; color: var(--ink-2); }
.note-w { background: var(--amber-wash); color: #7a3800; }
.note-a { background: var(--green-wash); color: #255019; }
.note-b { background: var(--blue-wash); color: #0a3f8e; }
.note-r { background: var(--red-wash); color: #8f2119; }

table.t { width: 100%; border-collapse: collapse; font-size: .9375rem; }
table.t th, table.t td { text-align: left; padding: .6rem .7rem; border-bottom: 1px solid var(--rule-soft); vertical-align: top; }
table.t th { font-size: .75rem; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); font-weight: 600; }
.t-scroll { overflow-x: auto; }

.foot { padding: 2.5rem 0 3.5rem; color: var(--faint); font-size: .8125rem; border-top: 1px solid var(--rule-soft); }
.foot a { color: var(--muted); }

[hidden] { display: none !important; }
.only-en, .only-zh { display: none; }
html:lang(en) .only-en { display: revert; }
html:lang(zh) .only-zh { display: revert; }
.sr { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

html:lang(zh) body { letter-spacing: 0; line-height: 1.72; }
html:lang(zh) h1, html:lang(zh) h2, html:lang(zh) h3 { letter-spacing: -.01em; }

@media print {
  .nav, .lang, .no-print { display: none !important; }
  body { font-size: 11pt; }
  .card, .tile { break-inside: avoid; }
}