/* 2026 lock-core ledger: rice paper, oxidized brass, vermillion seal */
:root {
  --paper: #f3ead8;
  --sheet: #fff8ec;
  --brass: #8a5a28;
  --brass-2: #c4893c;
  --ink: #2a1c12;
  --mute: #7a6550;
  --seal: #b4332a;
  --ok: #3d6a3c;
  --line: rgba(138, 90, 40, 0.22);
  --serif: "Noto Serif SC", "Songti SC", serif;
  --sans: "Noto Sans SC", "PingFang SC", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, monospace;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
section[id] { scroll-margin-top: 70px; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.7;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
code { font-family: var(--mono); color: var(--brass); font-size: 0.92em; }

.paper {
  pointer-events: none;
  position: fixed;
  inset: 0;
  z-index: 0;
  opacity: 0.18;
  background-image: url("images/texture.webp");
  background-size: 480px;
}

.skip { position: absolute; left: -999px; }
.skip:focus { left: 12px; top: 12px; z-index: 80; background: var(--seal); color: #fff; padding: 8px 12px; }

.lock-bar {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 22px;
  background: rgba(243, 234, 216, 0.94);
  border-bottom: 2px solid var(--brass);
}

.brand { display: flex; align-items: center; gap: 10px; font-family: var(--serif); font-weight: 700; }
.brand small { display: block; font-family: var(--mono); font-size: 11px; font-weight: 400; color: var(--mute); }
.lock { width: 28px; height: 28px; color: var(--brass); }

.lock-links { display: flex; flex-wrap: wrap; gap: 6px 14px; align-items: center; }
.lock-links a { font-size: 13px; color: var(--mute); }
.lock-links a.is-active, .lock-links a:hover { color: var(--brass); }
.lock-links .live {
  background: var(--seal);
  color: #fff;
  padding: 6px 12px;
  font-weight: 700;
}
.nav-toggle { display: none; background: var(--sheet); border: 1px solid var(--line); padding: 6px 10px; }

.hero { position: relative; z-index: 1; }
.hero > img { width: 100%; height: min(52vh, 480px); object-fit: cover; filter: saturate(0.9); }
.hero-sheet {
  width: min(920px, calc(100% - 40px));
  margin: -80px auto 0;
  position: relative;
  background: var(--sheet);
  padding: 36px 40px 40px;
  box-shadow: 0 18px 40px rgba(42, 28, 18, 0.12);
  border-top: 8px solid var(--brass);
}

.kicker {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--seal);
  margin: 0 0 8px;
}
h1, h2, h3 { font-family: var(--serif); line-height: 1.2; margin: 0 0 12px; }
h1 { font-size: clamp(2.1rem, 5vw, 3.6rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
.lead { max-width: 62ch; }

.pins {
  margin: 22px 0;
  padding: 14px 16px;
  border: 1px dashed var(--brass);
  background: repeating-linear-gradient(180deg, transparent, transparent 27px, rgba(138,90,40,0.08) 28px);
}
.pin-label { margin: 0 0 8px; font-size: 13px; color: var(--mute); }
.pins ol { list-style: none; padding: 0; margin: 0; display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.pins li {
  font-family: var(--mono);
  font-size: 13px;
  padding: 6px 8px 6px 28px;
  position: relative;
}
.pins li::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 12px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ok);
}
.pins li.bad::before { background: var(--seal); }
#pin-note { margin: 10px 0 0; color: var(--mute); font-size: 14px; }

.cta { display: flex; flex-wrap: wrap; gap: 10px; }
.btn {
  display: inline-flex;
  align-items: center;
  padding: 10px 16px;
  border: 1px solid var(--brass);
  background: transparent;
  color: var(--ink);
  font-size: 14px;
}
.btn.fill { background: var(--brass); color: #fff8ec; font-weight: 700; }

.wrap { width: min(1100px, calc(100% - 40px)); margin: 0 auto; padding: 72px 0; position: relative; z-index: 1; }
.quiet { color: var(--mute); max-width: 68ch; }

.tri { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; margin-top: 24px; }
.tri article { background: var(--sheet); padding: 20px; border: 1px solid var(--line); }
.tri .warn { border-color: var(--seal); }
.tri ul { margin: 0; padding-left: 1.1em; }

.ruled { background: rgba(255, 248, 236, 0.45); }

.pin-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 36px;
  align-items: center;
  margin: 48px 0;
}
.pin-row.flip { direction: rtl; }
.pin-row.flip > * { direction: ltr; }
.num { font-family: var(--mono); color: var(--seal); font-size: 12px; letter-spacing: 0.12em; }
figure { margin: 0; }
figcaption { font-size: 13px; color: var(--mute); margin-top: 8px; }

.bench { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-top: 20px; }
.bench article { background: var(--sheet); padding: 18px 20px; border-left: 4px solid var(--brass-2); }

.rules { padding-left: 1.2em; }
.rules li { margin: 8px 0; }

.keys { display: grid; gap: 1px; background: var(--line); border: 1px solid var(--line); margin-top: 16px; }
.keys div { display: grid; grid-template-columns: 160px 1fr; gap: 12px; padding: 12px 16px; background: var(--sheet); }
.keys span { color: var(--mute); }

footer { border-top: 2px solid var(--brass); background: #e7d8bf; position: relative; z-index: 1; }
.foot { display: flex; justify-content: space-between; align-items: center; gap: 16px; padding: 24px 0; }

@media (max-width: 900px) {
  .nav-toggle { display: block; }
  .lock-links {
    display: none;
    position: absolute;
    right: 12px; left: 12px; top: 52px;
    flex-direction: column;
    background: var(--sheet);
    border: 1px solid var(--line);
    padding: 12px;
  }
  .lock-links.open { display: flex; }
  .hero-sheet { padding: 24px 18px; margin-top: -40px; }
  .tri, .pin-row, .bench, .pins ol { grid-template-columns: 1fr; }
  .pin-row.flip { direction: ltr; }
  .keys div { grid-template-columns: 1fr; }
  .foot { flex-direction: column; align-items: flex-start; }
}