/* ============================================================
   Clavis Sinica · 中文之钥 — shared page styles
   Aesthetic: scholarly editorial / classical ink-on-paper
   Served at /css/clavis.css by app/page_routes.py
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=EB+Garamond:ital,wght@0,400;0,500;0,600;1,400&family=Noto+Serif+SC:wght@400;500;600;700&display=swap');

:root{
  --paper:#FBF7EF;
  --paper-2:#F3ECDD;
  --ink:#1B1714;
  --ink-soft:#4A433C;
  --ink-faint:#8A8175;
  --cinnabar:#9E2B25;
  --cinnabar-deep:#7C201C;
  --gold:#B08A3E;
  --rule:#D9CFBC;
  --serif:"EB Garamond","Noto Serif SC",Georgia,serif;
  --han:"Noto Serif SC","EB Garamond",serif;
  --maxw:720px;
}

*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--serif);
  font-size:19px;
  line-height:1.72;
  /* faint paper grain */
  background-image:
    radial-gradient(circle at 20% 10%, rgba(176,138,62,.045), transparent 55%),
    radial-gradient(circle at 85% 90%, rgba(158,43,37,.035), transparent 50%);
}

/* ---------- top bar ---------- */
.cs-top{
  border-bottom:1px solid var(--rule);
  background:rgba(251,247,239,.86);
  backdrop-filter:saturate(140%) blur(6px);
  position:sticky;top:0;z-index:20;
}
.cs-top-in{
  max-width:1080px;margin:0 auto;padding:.85rem 1.4rem;
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
}
.cs-brand{display:flex;align-items:center;gap:.7rem;text-decoration:none;color:var(--ink)}
.cs-seal{
  width:38px;height:38px;flex:0 0 38px;border-radius:6px;
  background:var(--cinnabar);color:#fff;
  display:grid;place-items:center;font-family:var(--han);
  font-weight:700;font-size:.92rem;line-height:1;letter-spacing:.02em;
  box-shadow:0 1px 0 rgba(0,0,0,.15) inset, 0 2px 6px rgba(124,32,28,.25);
  padding:3px;text-align:center;
}
.cs-wordmark b{font-weight:600;font-size:1.12rem;letter-spacing:.01em}
.cs-wordmark span{display:block;font-size:.74rem;letter-spacing:.22em;
  text-transform:uppercase;color:var(--ink-faint);margin-top:1px}
.cs-nav{display:flex;gap:1.4rem;font-size:.96rem}
.cs-nav a{color:var(--ink-soft);text-decoration:none;border-bottom:1px solid transparent;
  padding-bottom:2px;transition:color .2s,border-color .2s}
.cs-nav a:hover{color:var(--cinnabar);border-color:var(--cinnabar)}
@media(max-width:640px){.cs-nav{display:none}}

/* ---------- article ---------- */
.cs-wrap{max-width:var(--maxw);margin:0 auto;padding:3.4rem 1.4rem 5rem}
.cs-kicker{font-family:var(--han);color:var(--cinnabar);font-weight:600;
  letter-spacing:.18em;font-size:.82rem;text-transform:uppercase;margin:0 0 .6rem}
.cs-title{font-size:2.5rem;line-height:1.12;font-weight:600;margin:0 0 .4rem;letter-spacing:-.01em}
.cs-title .han{font-family:var(--han)}
.cs-sub{color:var(--ink-faint);font-style:italic;font-size:1.05rem;margin:0 0 .4rem}
.cs-updated{color:var(--ink-faint);font-size:.84rem;letter-spacing:.03em;margin:0}
.cs-rule{border:0;height:1px;background:var(--rule);margin:2rem 0}
.cs-rule-orn{border:0;height:auto;text-align:center;color:var(--gold);margin:2.6rem 0;
  font-size:1.1rem;letter-spacing:1rem}
.cs-rule-orn::before{content:"❖"}

.cs-prose h2{font-size:1.45rem;font-weight:600;margin:2.6rem 0 .7rem;letter-spacing:-.005em}
.cs-prose h2 .num{color:var(--cinnabar);font-feature-settings:"tnum";margin-right:.5rem}
.cs-prose h3{font-size:1.12rem;font-weight:600;margin:1.6rem 0 .4rem;color:var(--ink-soft)}
.cs-prose p{margin:0 0 1rem}
.cs-prose ul,.cs-prose ol{margin:0 0 1.1rem;padding-left:1.3rem}
.cs-prose li{margin:.35rem 0}
.cs-prose a{color:var(--cinnabar);text-decoration:underline;text-underline-offset:2px;
  text-decoration-color:rgba(158,43,37,.4)}
.cs-prose a:hover{text-decoration-color:var(--cinnabar)}
.cs-prose strong{font-weight:600}
.cs-prose .han{font-family:var(--han)}
.cs-note{background:var(--paper-2);border-left:3px solid var(--gold);
  padding:.9rem 1.1rem;margin:1.4rem 0;font-size:.96rem;border-radius:0 6px 6px 0}
.cs-lede{font-size:1.18rem;line-height:1.6;color:var(--ink-soft)}

/* ---------- footer ---------- */
.cs-foot{border-top:1px solid var(--rule);background:var(--paper-2)}
.cs-foot-in{max-width:1080px;margin:0 auto;padding:2.6rem 1.4rem;
  display:flex;flex-wrap:wrap;gap:2.2rem;justify-content:space-between}
.cs-foot h4{font-family:var(--han);font-size:.78rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--ink-faint);margin:0 0 .8rem;font-weight:600}
.cs-foot a{display:block;color:var(--ink-soft);text-decoration:none;font-size:.95rem;
  margin:.35rem 0}
.cs-foot a:hover{color:var(--cinnabar)}
.cs-foot-brand{max-width:300px}
.cs-foot-brand p{color:var(--ink-faint);font-size:.9rem;line-height:1.6;margin:.6rem 0 0}
.cs-copy{max-width:1080px;margin:0 auto;padding:1.2rem 1.4rem 2.4rem;
  color:var(--ink-faint);font-size:.82rem;border-top:1px solid var(--rule)}

/* ============================================================
   Content-page components: hero, timeline, cards (Task 2)
   ============================================================ */

/* hero */
.cs-hero{max-width:var(--maxw);margin:0 auto;padding:4rem 1.4rem 1rem;text-align:center}
.cs-hero .cs-kicker{margin-bottom:1rem}
.cs-hero h1{font-size:3rem;line-height:1.08;font-weight:600;margin:0 0 1rem;letter-spacing:-.015em}
.cs-hero h1 .han{font-family:var(--han)}
.cs-hero .lede{font-size:1.3rem;line-height:1.55;color:var(--ink-soft);max-width:34rem;margin:0 auto}
.cs-cta{display:inline-flex;gap:.6rem;align-items:center;margin-top:1.8rem;
  background:var(--cinnabar);color:#fff;text-decoration:none;font-weight:600;
  padding:.7rem 1.5rem;border-radius:7px;font-size:1.02rem;letter-spacing:.01em;
  box-shadow:0 2px 10px rgba(124,32,28,.28);transition:transform .15s,box-shadow .15s}
.cs-cta:hover{transform:translateY(-2px);box-shadow:0 6px 18px rgba(124,32,28,.34)}
.cs-cta.ghost{background:transparent;color:var(--cinnabar);box-shadow:none;
  border:1px solid var(--rule)}
.cs-cta.ghost:hover{border-color:var(--cinnabar);background:var(--paper-2)}
.cs-cta-row{display:flex;gap:.8rem;justify-content:center;flex-wrap:wrap;margin-top:1.8rem}
.cs-cta-row .cs-cta{margin-top:0}

/* glyph showcase (what page) */
.cs-glyphs{display:flex;gap:1rem;justify-content:center;flex-wrap:wrap;margin:2rem 0}
.cs-glyph{display:flex;flex-direction:column;align-items:center;gap:.3rem;
  background:var(--paper-2);border:1px solid var(--rule);border-radius:10px;
  padding:1rem 1.2rem;min-width:5.4rem}
.cs-glyph b{font-family:var(--han);font-size:2.4rem;font-weight:500;line-height:1;color:var(--ink)}
.cs-glyph span{font-size:.82rem;color:var(--ink-faint)}
.cs-eq{font-family:var(--han);font-size:1.5rem;color:var(--cinnabar);text-align:center;margin:.4rem 0}

/* three-script cards */
.cs-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));gap:1rem;margin:1.6rem 0}
.cs-card{background:var(--paper-2);border:1px solid var(--rule);border-radius:12px;
  padding:1.3rem 1.3rem 1.4rem}
.cs-card .tag{font-family:var(--han);color:var(--cinnabar);font-weight:600;font-size:.78rem;
  letter-spacing:.12em;text-transform:uppercase}
.cs-card h3{margin:.5rem 0 .4rem;font-size:1.16rem;font-weight:600}
.cs-card h3 .han{font-family:var(--han)}
.cs-card p{margin:0;font-size:.96rem;color:var(--ink-soft);line-height:1.55}
.cs-card .ex{font-family:var(--han);font-size:1.5rem;margin-top:.6rem;color:var(--ink)}

/* timeline (history page) */
.cs-timeline{position:relative;margin:2.4rem 0;padding-left:2.2rem}
.cs-timeline::before{content:"";position:absolute;left:.55rem;top:.4rem;bottom:.4rem;
  width:2px;background:linear-gradient(var(--gold),var(--rule))}
.cs-tl{position:relative;margin:0 0 2.1rem}
.cs-tl::before{content:"";position:absolute;left:-1.95rem;top:.45rem;width:.85rem;height:.85rem;
  border-radius:50%;background:var(--cinnabar);box-shadow:0 0 0 4px var(--paper)}
.cs-tl.modern::before{background:var(--gold)}
.cs-tl .yr{font-family:var(--han);font-weight:700;color:var(--cinnabar);font-size:1.02rem;
  font-feature-settings:"tnum";letter-spacing:.02em}
.cs-tl.modern .yr{color:var(--gold)}
.cs-tl h3{margin:.15rem 0 .35rem;font-size:1.18rem;font-weight:600;letter-spacing:-.005em}
.cs-tl h3 .han{font-family:var(--han)}
.cs-tl p{margin:0;color:var(--ink-soft);font-size:1rem;line-height:1.6}
.cs-tl .src{font-size:.82rem;color:var(--ink-faint);font-style:italic}

/* big pull quote */
.cs-pull{font-size:1.5rem;line-height:1.4;font-style:italic;color:var(--ink);
  border-left:3px solid var(--cinnabar);padding:.2rem 0 .2rem 1.3rem;margin:2.4rem 0}
.cs-pull .han{font-family:var(--han);font-style:normal}

/* press list */
.cs-press{list-style:none;padding:0;margin:1.4rem 0}
.cs-press li{border:1px solid var(--rule);border-radius:12px;padding:1.2rem 1.3rem;
  margin:0 0 1rem;background:var(--paper-2)}
.cs-press .meta{font-family:var(--han);font-size:.8rem;letter-spacing:.1em;text-transform:uppercase;
  color:var(--cinnabar);font-weight:600;margin:0 0 .35rem}
.cs-press h3{margin:0 0 .4rem;font-size:1.16rem;font-weight:600;line-height:1.3}
.cs-press p{margin:0;color:var(--ink-soft);font-size:.97rem;line-height:1.55}
.cs-press a{color:var(--cinnabar)}