/* ============================================================
   Dagora — shared design system
   Deck-locked VI · near-black ground · single amber accent
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Manrope:wght@400;500;600;700;800&family=Noto+Serif+SC:wght@400;600&family=Spectral:ital,wght@0,300;0,400;0,500;0,600;1,400&family=Space+Grotesk:wght@500;600;700&family=JetBrains+Mono:wght@400;500&display=swap');

/* bilingual: hide the other language */
html:not([lang="zh"]) .i-zh { display: none !important; }
html[lang="zh"] .i-en { display: none !important; }
html[lang="zh"] { letter-spacing: 0.01em; }
html[lang="zh"] .lede,
html[lang="zh"] .body-lg { max-width: 36em; }
html[lang="zh"] h1,
html[lang="zh"] .h2,
html[lang="zh"] .display,
html[lang="zh"] .serif {
  font-family: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', serif;
}

:root {
  --bg:        #0A0A0B;
  --bg-alt:    #0D0D10;
  --ink:       #EDEDEF;
  --ink-2:     #9A9AA2;
  --ink-3:     #66666E;
  --accent:    #E0A43A;
  --accent-2:  #EBB95F;
  --accent-soft: rgba(224,164,58,0.13);
  --accent-line: rgba(224,164,58,0.50);
  --hair:      rgba(255,255,255,0.09);
  --hair-2:    rgba(255,255,255,0.045);
  --card:      #131318;
  --card-2:    #17171D;
  --card-border: rgba(255,255,255,0.07);
  --warn:      oklch(0.62 0.13 35);

  --serif: 'Spectral', Georgia, 'Times New Roman', serif;
  --sans:  'Manrope', system-ui, -apple-system, sans-serif;
  --brand: 'Space Grotesk', 'Manrope', system-ui, sans-serif;
  --mono:  'JetBrains Mono', ui-monospace, monospace;

  --maxw: 1240px;
  --gutter: clamp(22px, 5vw, 80px);
  --nav-h: 76px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

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

body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 18px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

::selection { background: var(--accent-soft); color: var(--accent-2); }

a { color: inherit; text-decoration: none; }

img, svg { display: block; max-width: 100%; }

/* ---------- layout primitives ---------- */
.wrap { max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); width: 100%; }

section { position: relative; }
.band { padding-block: clamp(76px, 11vw, 148px); }
.band.alt { background: var(--bg-alt); }
.band.hair-top { border-top: 1px solid var(--hair); }

.serif { font-family: var(--serif); }
.mono  { font-family: var(--mono); }
.gr    { color: var(--accent); }
.ink2  { color: var(--ink-2); }

/* ---------- kicker / section label ---------- */
.kicker {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-2);
  display: inline-flex;
  align-items: center;
  gap: 11px;
}
.kicker .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); flex: none; }

/* ---------- type scale ---------- */
.eyebrow { font-family: var(--mono); font-size: 13px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink-3); }

h1, h2, h3 { font-weight: 700; letter-spacing: -0.02em; line-height: 1.08; text-wrap: balance; }

.display {
  font-family: var(--serif);
  font-weight: 400;
  font-size: clamp(40px, 6.4vw, 86px);
  line-height: 1.04;
  letter-spacing: -0.025em;
}
.h2 {
  font-size: clamp(30px, 4.3vw, 58px);
  line-height: 1.1;
  letter-spacing: -0.02em;
}
.h2.serif { font-weight: 400; }
.lede {
  font-size: clamp(19px, 2.1vw, 26px);
  line-height: 1.5;
  color: var(--ink-2);
  font-weight: 400;
  max-width: 40ch;
}
.body-lg { font-size: clamp(18px, 1.6vw, 21px); line-height: 1.62; color: var(--ink-2); max-width: 64ch; }
.body-lg strong, .lede strong { color: var(--ink); font-weight: 600; }

.section-head { display: flex; flex-direction: column; gap: 22px; max-width: 60ch; }

/* value cards · Monday helps */
.helps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.help {
  border: 1px solid var(--card-border);
  background: var(--card);
  border-radius: 14px;
  padding: 30px 28px 28px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 220px;
}
.help .hn { font-family: var(--mono); font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--accent); }
.help .ht { font-size: clamp(18px, 1.9vw, 22px); font-weight: 600; line-height: 1.25; color: var(--ink); }
.help .hp { font-size: 15.5px; line-height: 1.55; color: var(--ink-2); }

.who {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.who .help { min-height: 0; }

.cite-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.cite-box {
  border-radius: 14px;
  padding: 32px 30px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.cite-box.yes { border: 1px solid var(--accent-line); background: var(--accent-soft); }
.cite-box.no { border: 1px dashed var(--hair); background: transparent; }
.cite-box .cl { font-family: var(--mono); font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase; }
.cite-box.yes .cl { color: var(--accent); }
.cite-box.no .cl { color: var(--ink-3); }
.cite-box .ct { font-size: clamp(20px, 2.2vw, 26px); font-weight: 600; line-height: 1.2; }
.cite-box.yes .ct { color: var(--ink); }
.cite-box.no .ct { color: var(--ink-2); }
.cite-box .cp { font-size: 15.5px; line-height: 1.55; color: var(--ink-2); }

.scenes { display: flex; flex-direction: column; }
.scene {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 28px;
  padding: 32px 4px;
  border-top: 1px solid var(--hair-2);
}
.scene:first-child { border-top: 1px solid var(--hair); }
.scene .sn { font-family: var(--mono); font-size: 13px; color: var(--accent); padding-top: 6px; }
.scene .st { font-size: clamp(20px, 2.2vw, 26px); font-weight: 600; color: var(--ink); line-height: 1.25; }
.scene .sp { font-size: clamp(16px, 1.6vw, 19px); color: var(--ink-2); line-height: 1.55; margin-top: 12px; max-width: 58ch; }

@media (max-width: 900px) {
  .helps, .cite-pair, .who { grid-template-columns: 1fr; }
  .scene { grid-template-columns: 1fr; gap: 10px; }
}

/* ---------- buttons ---------- */
.btns { display: flex; flex-wrap: wrap; gap: 14px; align-items: center; }
.btn {
  display: inline-flex; align-items: center; gap: 9px;
  font-family: var(--sans); font-size: 15.5px; font-weight: 600;
  letter-spacing: 0.005em;
  padding: 14px 24px;
  border-radius: 9px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform .25s cubic-bezier(.2,.7,.2,1), background .2s, border-color .2s, color .2s;
  white-space: nowrap;
}
.btn .arr { transition: transform .25s cubic-bezier(.2,.7,.2,1); }
.btn-primary { background: var(--accent); color: #1a1206; border-color: var(--accent); }
.btn-primary:hover { background: var(--accent-2); transform: translateY(-2px); }
.btn-primary:hover .arr { transform: translate(2px,-2px); }
.btn-outline { border-color: var(--accent-line); color: var(--accent); background: transparent; }
.btn-outline:hover { background: var(--accent-soft); border-color: var(--accent); transform: translateY(-2px); }
.btn-ghost { color: var(--ink-2); border-color: transparent; padding-inline: 10px; }
.btn-ghost:hover { color: var(--ink); }
.btn-ghost:hover .arr { transform: translateX(3px); }

.textlink {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 14px; letter-spacing: 0.04em;
  color: var(--accent);
  border-bottom: 1px solid var(--accent-line);
  padding-bottom: 3px;
  transition: gap .2s, border-color .2s;
}
.textlink:hover { gap: 12px; border-color: var(--accent); }

/* ============================================================
   NAV
   ============================================================ */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 100;
  height: var(--nav-h);
  display: flex; align-items: center;
  transition: background .35s, border-color .35s, backdrop-filter .35s;
  border-bottom: 1px solid transparent;
}
.nav.scrolled {
  background: color-mix(in oklab, var(--bg) 78%, transparent);
  backdrop-filter: blur(16px) saturate(1.2);
  border-bottom: 1px solid var(--hair);
}
.nav .wrap { display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.brand { display: inline-flex; align-items: center; gap: 11px; }
.brand .logomark { width: 38px; height: 38px; flex: none; }
.brand .wordmark { font-family: var(--brand); font-weight: 600; font-size: 27px; letter-spacing: -0.04em; color: var(--ink); }
.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a {
  font-size: 15px; font-weight: 500; color: var(--ink-2);
  padding: 8px 14px; border-radius: 7px;
  white-space: nowrap; flex: none;
  transition: color .2s, background .2s;
}
.nav-links a:hover { color: var(--ink); }
.nav-links a.active { color: var(--ink); }
.nav-links a.gh {
  color: var(--ink); font-family: var(--mono); font-size: 13.5px;
  border: 1px solid var(--hair); margin-left: 8px;
  display: inline-flex; align-items: center; gap: 5px; white-space: nowrap;
}
.nav-links a.gh:hover { border-color: var(--accent-line); color: var(--accent); }
.lang-toggle {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-2);
  background: transparent;
  border: 1px solid var(--hair);
  border-radius: 7px;
  padding: 7px 12px;
  cursor: pointer;
  margin-left: 6px;
  flex: none;
}
.lang-toggle:hover { color: var(--accent); border-color: var(--accent-line); }
.lang-toggle-mobile { display: none; }
.nav-toggle { display: none; }

/* mobile menu */
.mobile-menu {
  position: fixed; inset: var(--nav-h) 0 0; z-index: 99;
  background: color-mix(in oklab, var(--bg) 96%, transparent);
  backdrop-filter: blur(20px);
  border-top: 1px solid var(--hair);
  padding: 24px var(--gutter);
  display: flex; flex-direction: column; gap: 4px;
  transform: translateY(-8px); opacity: 0; pointer-events: none;
  transition: opacity .25s, transform .25s;
}
.mobile-menu.open { opacity: 1; transform: translateY(0); pointer-events: auto; }
.mobile-menu a {
  font-size: 22px; font-weight: 500; color: var(--ink-2);
  padding: 16px 4px; border-bottom: 1px solid var(--hair-2);
  display: flex; justify-content: space-between; align-items: center;
}
.mobile-menu a:hover { color: var(--ink); }

/* ============================================================
   COMPONENTS
   ============================================================ */

/* code block */
.code {
  background: #0E0E12;
  border: 1px solid var(--card-border);
  border-radius: 13px;
  overflow: hidden;
  font-family: var(--mono);
}
.code-bar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 13px 18px;
  border-bottom: 1px solid var(--hair-2);
}
.code-bar .fname { font-size: 12.5px; letter-spacing: 0.06em; color: var(--ink-3); text-transform: uppercase; }
.copy-btn {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.05em;
  color: var(--ink-2); background: transparent;
  border: 1px solid var(--hair); border-radius: 6px;
  padding: 6px 12px; cursor: pointer;
  transition: color .2s, border-color .2s;
}
.copy-btn:hover { color: var(--accent); border-color: var(--accent-line); }
.copy-btn.done { color: var(--accent); border-color: var(--accent-line); }
.code pre {
  margin: 0; padding: 22px 24px;
  font-size: clamp(13px, 1.35vw, 15.5px);
  line-height: 1.75;
  overflow-x: auto;
  color: var(--ink-2);
}
.code .k { color: var(--accent); }              /* keys */
.code .s { color: var(--ink); }                 /* strings */
.code .n { color: var(--accent-2); }            /* numbers */
.code .p { color: var(--ink-3); }               /* punctuation */
.code .c { color: var(--ink-3); font-style: italic; }

/* cards */
.card {
  background: var(--card);
  border: 1px solid var(--card-border);
  border-radius: 14px;
  padding: 32px 34px;
  transition: transform .3s cubic-bezier(.2,.7,.2,1), border-color .3s, background .3s;
}
.card.hover:hover { transform: translateY(-4px); border-color: var(--hair); background: var(--card-2); }
.card.accent { background: var(--accent-soft); border-color: var(--accent-line); }

/* grade vocabulary — a word, not a permission */
.grades {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 12px;
}
.grade-card {
  border: 1px solid var(--card-border);
  background: var(--card);
  border-radius: 13px;
  padding: 22px 18px 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 132px;
}
.grade-card .gk {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--accent);
  word-break: break-word;
}
.grade-card .gn { font-size: 14px; color: var(--ink-2); line-height: 1.4; }
.grade-note {
  font-family: var(--mono);
  font-size: 13.5px;
  letter-spacing: 0.03em;
  color: var(--ink-3);
  margin-top: 22px;
  max-width: 72ch;
  line-height: 1.55;
}
.flow-node.closed {
  border-style: dashed;
  background: transparent;
  opacity: 0.85;
}
.flow-node.closed .ft { color: var(--ink-2); font-weight: 500; }

/* confidence → permission table (retired on public pages; keep for unused CSS) */
.perm {
  border: 1px solid var(--card-border);
  border-radius: 14px;
  overflow: hidden;
  background: var(--card);
}
.perm-row {
  display: grid;
  grid-template-columns: 1.1fr 1.3fr;
  align-items: center;
  column-gap: 28px;
  padding: 24px 32px;
}
.perm-head { padding-block: 16px; border-bottom: 1px solid var(--hair); }
.perm-head span { font-family: var(--mono); font-size: 12.5px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); }
.perm-row:not(.perm-head):not(:last-child) { border-bottom: 1px solid var(--hair-2); }
.perm-conf { display: flex; align-items: center; gap: 16px; }
.meter { display: flex; gap: 4px; flex: none; }
.meter i { width: 15px; height: 9px; border-radius: 2px; background: var(--ink-3); opacity: 0.3; }
.meter i.on { opacity: 1; background: var(--ink-2); }
.perm-conf .lvl { font-size: clamp(16px, 1.8vw, 20px); font-weight: 600; color: var(--ink); }
.perm-act { font-size: clamp(15px, 1.7vw, 19px); font-weight: 500; color: var(--ink-2); text-wrap: pretty; }
.perm-row.hi .perm-act { color: var(--accent); }
.perm-row.hi .meter i.on { background: var(--accent); }

/* labelled diagram nodes / pills */
.pill {
  font-family: var(--mono); font-size: 14px; color: var(--ink-2);
  border: 1px solid var(--hair); border-radius: 8px;
  padding: 9px 16px; white-space: nowrap;
}
.pill.gr { color: var(--accent); border-color: var(--accent-line); background: var(--accent-soft); }

/* scroll reveal */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity .7s cubic-bezier(.2,.7,.2,1), transform .7s cubic-bezier(.2,.7,.2,1); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: .08s; }
.reveal.d2 { transition-delay: .16s; }
.reveal.d3 { transition-delay: .24s; }
.reveal.d4 { transition-delay: .32s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer { border-top: 1px solid var(--hair); padding-block: clamp(64px, 8vw, 104px) 48px; background: var(--bg); }
.footer-sub { font-size: 13px; letter-spacing: 0.06em; color: var(--accent); margin-bottom: 20px; text-transform: none; }
.footer-close {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(28px, 4vw, 50px); line-height: 1.1; letter-spacing: -0.02em;
  color: var(--ink); max-width: 18ch;
}
.footer-grid {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 40px;
  margin-top: 64px; padding-top: 40px; border-top: 1px solid var(--hair);
}
.footer-brand { display: flex; flex-direction: column; gap: 14px; max-width: 30ch; }
.footer-brand .wordmark { font-family: var(--brand); font-weight: 600; font-size: 25px; letter-spacing: -0.04em; color: var(--ink); }
.footer-brand p { font-size: 14px; color: var(--ink-3); font-family: var(--mono); letter-spacing: 0.02em; }
.footer-cols { display: flex; gap: clamp(40px, 7vw, 96px); flex-wrap: wrap; }
.footer-col { display: flex; flex-direction: column; gap: 14px; }
.footer-col .ft-h { font-family: var(--mono); font-size: 12px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink-3); margin-bottom: 4px; }
.footer-col a { font-size: 15px; color: var(--ink-2); transition: color .2s; }
.footer-col a:hover { color: var(--accent); }
.footer-base {
  margin-top: 56px; padding-top: 28px; border-top: 1px solid var(--hair-2);
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px;
  font-family: var(--mono); font-size: 12.5px; color: var(--ink-3); letter-spacing: 0.04em;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 880px) {
  .nav-links { display: none; }
  .lang-toggle { margin-left: auto; }
  .lang-toggle-mobile { display: inline-flex; }
  .nav-toggle {
    display: inline-flex; flex-direction: column; gap: 5px;
    background: none; border: none; cursor: pointer; padding: 8px;
  }
  .nav-toggle span { width: 24px; height: 1.5px; background: var(--ink); transition: transform .3s, opacity .3s; }
  .nav-toggle.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
  .nav-toggle.open span:nth-child(2) { opacity: 0; }
  .nav-toggle.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }
}
@media (min-width: 881px) { .mobile-menu { display: none; } }

@media (max-width: 900px) {
  .grades { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .grades { grid-template-columns: 1fr; }
}
@media (max-width: 720px) {
  .perm-row { grid-template-columns: 1fr; gap: 12px; padding: 20px 22px; }
  .perm-head { display: none; }
  .lede { max-width: none; }
}