/* ==========================================================================
   陈松如 · 国宴川菜纪念馆
   设计方向：档案馆 x 宣纸质感 —— 朱红印章、墨黑手写、老照片档案气息
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Ma+Shan+Zheng&family=Noto+Serif+SC:wght@400;500;600;700;900&family=Noto+Sans+SC:wght@300;400;500;600&display=swap');

:root{
  --paper: #f2e8d5;
  --paper-2: #eaddc2;
  --paper-deep: #e2d3b3;
  --ink: #20180f;
  --ink-soft: #4b3d2c;
  --ink-faint: #7a6b54;
  --red: #9c1f26;
  --red-deep: #6c1017;
  --red-bright: #b93a2e;
  --gold: #ab8143;
  --gold-soft: #cba766;
  --jade: #445c46;
  --line: rgba(32,24,14,.14);
  --line-strong: rgba(32,24,14,.28);
  --shadow: 0 18px 40px -20px rgba(32,20,10,.45);
  --radius: 4px;
  --font-brush: 'Ma Shan Zheng', cursive;
  --font-serif: 'Noto Serif SC', 'Songti SC', serif;
  --font-sans: 'Noto Sans SC', 'PingFang SC', sans-serif;
  --maxw: 1120px;
}

*,*::before,*::after{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
body{
  margin:0;
  font-family:var(--font-sans);
  color:var(--ink);
  background-color:var(--paper);
  background-image:
    radial-gradient(circle at 15% 8%, rgba(156,31,38,.05), transparent 40%),
    radial-gradient(circle at 85% 92%, rgba(171,129,67,.08), transparent 45%),
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='120' height='120'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix type='matrix' values='0 0 0 0 0.12  0 0 0 0 0.09  0 0 0 0 0.05  0 0 0 0.03 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  line-height:1.75;
  overflow-x:hidden;
}
img{ max-width:100%; display:block; }
a{ color:inherit; text-decoration:none; }
h1,h2,h3,h4{ font-family:var(--font-serif); font-weight:700; margin:0; color:var(--ink); letter-spacing:.02em; }
p{ margin:0 0 1em; }
ul{ margin:0; padding:0; list-style:none; }
.container{ max-width:var(--maxw); margin:0 auto; padding:0 28px; }

::selection{ background:var(--red); color:var(--paper); }

/* ---------- scroll reveal ---------- */
.reveal{ opacity:0; transform:translateY(24px); transition:opacity .8s ease, transform .8s ease; }
.reveal.in{ opacity:1; transform:translateY(0); }

/* ---------- top bar / seal marks ---------- */
.top-strip{
  background:var(--ink);
  color:var(--paper-2);
  font-size:.72rem;
  letter-spacing:.14em;
  text-align:center;
  padding:6px 12px;
  font-family:var(--font-sans);
}

/* ---------- header ---------- */
header.site{
  position:sticky; top:0; z-index:50;
  background:linear-gradient(180deg, var(--paper) 0%, rgba(242,232,213,.94) 100%);
  border-bottom:1px solid var(--line);
  backdrop-filter:blur(6px);
}
.nav-wrap{
  display:flex; align-items:center; justify-content:space-between;
  padding:14px 28px; max-width:var(--maxw); margin:0 auto;
}
.brand{ display:flex; align-items:center; gap:14px; }
.brand .seal{
  width:46px; height:46px; border-radius:6px;
  background:var(--red);
  color:var(--paper);
  display:flex; align-items:center; justify-content:center;
  font-family:var(--font-brush); font-size:1.7rem;
  box-shadow: inset 0 0 0 2px rgba(255,255,255,.18), var(--shadow);
  transform:rotate(-3deg);
  flex-shrink:0;
}
.brand .titles{ display:flex; flex-direction:column; line-height:1.25; }
.brand .titles .zh{ font-family:var(--font-serif); font-weight:700; font-size:1.18rem; letter-spacing:.08em; }
.brand .titles .sub{ font-size:.68rem; letter-spacing:.24em; color:var(--ink-faint); }

nav.main-nav{ display:flex; gap:2px; overflow-x:auto; scrollbar-width:none; }
nav.main-nav::-webkit-scrollbar{ display:none; }
nav.main-nav a{
  position:relative;
  padding:10px 12px;
  font-size:.86rem;
  font-family:var(--font-serif);
  font-weight:500;
  color:var(--ink-soft);
  border-radius:3px;
  transition:color .25s ease;
  white-space:nowrap;
  flex-shrink:0;
}
nav.main-nav a::after{
  content:""; position:absolute; left:16px; right:16px; bottom:6px; height:2px;
  background:var(--red); transform:scaleX(0); transform-origin:left;
  transition:transform .3s ease;
}
nav.main-nav a:hover, nav.main-nav a.active{ color:var(--red-deep); }
nav.main-nav a:hover::after, nav.main-nav a.active::after{ transform:scaleX(1); }

.nav-toggle{ display:none; background:none; border:1px solid var(--line-strong); border-radius:4px; width:42px; height:42px; align-items:center; justify-content:center; cursor:pointer; }
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after{
  content:""; display:block; width:20px; height:2px; background:var(--ink); position:relative; transition:.25s;
}
.nav-toggle span::before{ position:absolute; top:-6px; }
.nav-toggle span::after{ position:absolute; top:6px; }

@media (max-width:860px){
  nav.main-nav{
    position:fixed; inset:64px 0 auto 0; background:var(--paper); flex-direction:column;
    padding:8px 20px 20px; border-bottom:1px solid var(--line); box-shadow:var(--shadow);
    transform:translateY(-12px); opacity:0; pointer-events:none; transition:.25s ease;
  }
  nav.main-nav.open{ transform:translateY(0); opacity:1; pointer-events:auto; }
  nav.main-nav a{ padding:12px 6px; border-bottom:1px dashed var(--line); }
  .nav-toggle{ display:flex; }
}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex; align-items:center; gap:8px;
  font-family:var(--font-serif); font-weight:600; font-size:.95rem;
  padding:12px 26px; border-radius:2px; border:1.5px solid var(--ink);
  background:transparent; color:var(--ink); cursor:pointer;
  transition:all .25s ease; letter-spacing:.04em;
}
.btn:hover{ background:var(--ink); color:var(--paper); }
.btn.primary{ background:var(--red); border-color:var(--red); color:var(--paper); }
.btn.primary:hover{ background:var(--red-deep); border-color:var(--red-deep); }
.btn.ghost{ border-color:rgba(242,232,213,.5); color:var(--paper); }
.btn.ghost:hover{ background:rgba(242,232,213,.12); color:var(--paper); }

/* ---------- hero ---------- */
.hero{
  position:relative;
  min-height:88vh;
  display:flex; align-items:center;
  background:
    radial-gradient(ellipse at 70% 20%, rgba(156,31,38,.16), transparent 55%),
    linear-gradient(160deg, #1b140d 0%, #2a1c12 55%, #1b140d 100%);
  color:var(--paper);
  overflow:hidden;
}
.hero::before{
  content:"松"; position:absolute; font-family:var(--font-brush);
  font-size:56vw; line-height:1; color:rgba(242,232,213,.045);
  right:-10%; top:-14%; pointer-events:none; user-select:none;
}
.hero .container{ position:relative; z-index:2; padding-top:60px; padding-bottom:60px; }
.hero .eyebrow{
  font-size:.8rem; letter-spacing:.32em; color:var(--gold-soft); margin-bottom:22px;
  display:flex; align-items:center; gap:12px;
}
.hero .eyebrow::before{ content:""; width:34px; height:1px; background:var(--gold-soft); display:inline-block; }
.hero h1{
  color:var(--paper); font-size:clamp(2.6rem, 6vw, 5rem); line-height:1.15; margin-bottom:22px;
}
.hero h1 em{ font-style:normal; color:var(--gold-soft); }
.hero .lede{ max-width:600px; font-size:1.12rem; color:rgba(242,232,213,.82); margin-bottom:34px; }
.hero .cta-row{ display:flex; gap:16px; flex-wrap:wrap; margin-bottom:52px; }
.hero .quote{
  font-family:var(--font-serif); font-size:1.3rem; font-weight:500; max-width:640px;
  border-left:3px solid var(--red-bright); padding-left:20px; color:var(--paper-2);
}
.hero .quote small{ display:block; margin-top:10px; font-size:.78rem; letter-spacing:.1em; color:var(--gold-soft); font-family:var(--font-sans); }

/* ---------- fact strip ---------- */
.fact-strip{ background:var(--ink); color:var(--paper-2); }
.fact-strip .container{
  display:grid; grid-template-columns:repeat(4,1fr); gap:0;
}
.fact-strip .fact{
  padding:26px 20px; text-align:center; border-left:1px solid rgba(242,232,213,.12);
}
.fact-strip .fact:first-child{ border-left:none; }
.fact-strip .fact .num{ font-family:var(--font-serif); font-size:1.9rem; color:var(--gold-soft); font-weight:700; }
.fact-strip .fact .label{ font-size:.78rem; letter-spacing:.06em; color:rgba(242,232,213,.7); margin-top:4px; }
@media (max-width:760px){ .fact-strip .container{ grid-template-columns:repeat(2,1fr); } .fact-strip .fact{ border-left:none; border-top:1px solid rgba(242,232,213,.12);} }

/* ---------- section basics ---------- */
section{ padding:88px 0; position:relative; }
section.tight{ padding:56px 0; }
.section-head{ margin-bottom:52px; max-width:720px; }
.section-head .tag{
  font-size:.78rem; letter-spacing:.28em; color:var(--red); font-weight:600; margin-bottom:14px; display:block;
}
.section-head h2{ font-size:clamp(1.8rem,4vw,2.6rem); margin-bottom:16px; }
.section-head p{ color:var(--ink-soft); font-size:1.03rem; }
.divider-seal{ display:flex; align-items:center; gap:14px; margin:0 0 40px; color:var(--ink-faint); font-size:.8rem; letter-spacing:.1em; }
.divider-seal::before,.divider-seal::after{ content:""; flex:1; height:1px; background:var(--line-strong); }

/* ---------- nav-card grid on homepage ---------- */
.nav-grid{ display:grid; grid-template-columns:repeat(3,1fr); gap:22px; }
@media (max-width:900px){ .nav-grid{ grid-template-columns:repeat(2,1fr);} }
@media (max-width:620px){ .nav-grid{ grid-template-columns:1fr;} }
.nav-card{
  position:relative; background:var(--paper-2);
  border:1px solid var(--line); padding:34px 26px; border-radius:var(--radius);
  transition:transform .3s ease, box-shadow .3s ease, border-color .3s ease;
  overflow:hidden;
}
.nav-card::before{
  content:attr(data-mark); position:absolute; right:14px; top:8px; font-family:var(--font-brush);
  font-size:3.6rem; color:rgba(156,31,38,.08);
}
.nav-card:hover{ transform:translateY(-6px); box-shadow:var(--shadow); border-color:var(--red); }
.nav-card .idx{ font-family:var(--font-serif); color:var(--red); font-weight:700; font-size:.85rem; letter-spacing:.1em; }
.nav-card h3{ font-size:1.32rem; margin:12px 0 10px; }
.nav-card p{ color:var(--ink-soft); font-size:.92rem; margin-bottom:16px; }
.nav-card .go{ font-size:.85rem; color:var(--red-deep); font-weight:600; }

/* ---------- quote strip / carousel ---------- */
.quote-block{
  background:var(--paper-2); border:1px solid var(--line); border-radius:var(--radius);
  padding:44px 40px; position:relative;
}
.quote-block::before{
  content:"“"; position:absolute; top:-6px; left:20px; font-family:var(--font-brush); font-size:5rem; color:var(--red); opacity:.5;
}
.quote-block p.q{ font-family:var(--font-serif); font-size:1.5rem; line-height:1.6; margin-bottom:14px; }
.quote-block .src{ font-size:.85rem; color:var(--ink-faint); letter-spacing:.04em; }

/* ---------- timeline ---------- */
.timeline{ position:relative; margin-top:20px; }
.timeline::before{
  content:""; position:absolute; left:120px; top:0; bottom:0; width:2px;
  background:linear-gradient(var(--line-strong),var(--line-strong)) ;
  background-image:repeating-linear-gradient(to bottom, var(--red) 0 6px, transparent 6px 14px);
}
.tl-item{ position:relative; padding:0 0 44px 160px; }
.tl-item .yr{
  position:absolute; left:0; top:-2px; width:100px; text-align:right;
  font-family:var(--font-serif); font-weight:700; color:var(--red-deep); font-size:1rem;
}
.tl-item .dot{
  position:absolute; left:114px; top:4px; width:14px; height:14px; border-radius:50%;
  background:var(--gold); border:3px solid var(--paper);
  box-shadow:0 0 0 2px var(--red);
}
.tl-item h4{ font-size:1.12rem; margin-bottom:8px; }
.tl-item p{ color:var(--ink-soft); font-size:.95rem; }
.tl-item .impact{
  margin-top:8px; font-size:.85rem; color:var(--jade); border-left:2px solid var(--jade);
  padding-left:10px; font-style:normal;
}
@media (max-width:640px){
  .timeline::before{ left:52px; }
  .tl-item{ padding-left:78px; }
  .tl-item .yr{ position:static; text-align:left; width:auto; display:block; margin-bottom:6px; }
  .tl-item .dot{ left:46px; top:2px; }
}

/* badges: evidence strength */
.badge{
  display:inline-block; font-size:.72rem; padding:3px 10px; border-radius:20px;
  border:1px solid currentColor; letter-spacing:.03em; font-family:var(--font-sans); font-weight:500;
}
.badge.first{ color:var(--jade); }
.badge.indep{ color:#2b5f7a; }
.badge.bio{ color:var(--gold); }
.badge.doubt{ color:var(--red); }

/* ---------- cards generic ---------- */
.card{ background:var(--paper-2); border:1px solid var(--line); border-radius:var(--radius); padding:30px; }
.grid-2{ display:grid; grid-template-columns:1fr 1fr; gap:24px; }
.grid-3{ display:grid; grid-template-columns:repeat(3,1fr); gap:24px; }
@media (max-width:900px){ .grid-3{ grid-template-columns:1fr 1fr; } }
@media (max-width:640px){ .grid-2,.grid-3{ grid-template-columns:1fr; } }

/* ---------- mental model cards ---------- */
.model-card{
  background:var(--paper-2); border:1px solid var(--line); border-radius:var(--radius);
  padding:30px 28px; position:relative;
}
.model-card .mnum{
  font-family:var(--font-brush); font-size:2.6rem; color:var(--red); line-height:1; position:absolute; top:14px; right:22px; opacity:.7;
}
.model-card h3{ font-size:1.2rem; margin-bottom:6px; padding-right:50px; }
.model-card .oneliner{ color:var(--red-deep); font-weight:600; font-size:.95rem; margin-bottom:14px; }
.model-card .evidence{ font-size:.88rem; color:var(--ink-soft); border-top:1px dashed var(--line-strong); padding-top:12px; margin-top:12px; }
.model-card .limit{ font-size:.82rem; color:var(--ink-faint); margin-top:10px; }
.model-card .limit b{ color:var(--red); }

/* ---------- recipe / standardization visual ---------- */
.recipe-card{ background:var(--ink); color:var(--paper-2); border-radius:var(--radius); padding:30px; }
.recipe-card h4{ color:var(--gold-soft); font-size:1.1rem; margin-bottom:16px; }
.recipe-bar{ display:flex; align-items:center; gap:14px; margin-bottom:12px; font-size:.88rem; }
.recipe-bar .lbl{ width:110px; flex-shrink:0; color:rgba(242,232,213,.75); }
.recipe-bar .track{ flex:1; height:8px; background:rgba(242,232,213,.12); border-radius:6px; overflow:hidden; }
.recipe-bar .fill{ height:100%; background:linear-gradient(90deg, var(--red-bright), var(--gold)); border-radius:6px; }
.recipe-bar .val{ width:76px; text-align:right; color:var(--gold-soft); font-family:var(--font-serif); }

/* ---------- dish grid ---------- */
.dish-grid{ display:grid; grid-template-columns:repeat(4,1fr); gap:16px; }
@media (max-width:900px){ .dish-grid{ grid-template-columns:repeat(2,1fr);} }
@media (max-width:520px){ .dish-grid{ grid-template-columns:1fr;} }
.dish{
  border:1px solid var(--line); border-radius:var(--radius); padding:18px; background:var(--paper);
  transition:.25s;
}
.dish:hover{ border-color:var(--red); transform:translateY(-3px); }
.dish .name{ font-family:var(--font-serif); font-weight:700; font-size:1.05rem; margin-bottom:6px; }
.dish .tag{ font-size:.78rem; color:var(--jade); }
.dish p{ font-size:.85rem; color:var(--ink-soft); margin:8px 0 0; }

/* ---------- lineage tree ---------- */
.lineage-col{ display:flex; flex-direction:column; gap:14px; }
.lineage-node{
  border:1px solid var(--line); border-radius:var(--radius); padding:16px 18px; background:var(--paper-2);
  display:flex; justify-content:space-between; align-items:flex-start; gap:12px; flex-wrap:wrap;
}
.lineage-node .who{ font-family:var(--font-serif); font-weight:700; }
.lineage-node .desc{ font-size:.85rem; color:var(--ink-soft); margin-top:4px; max-width:520px; }
.lineage-center{
  text-align:center; padding:28px; background:var(--red); color:var(--paper); border-radius:var(--radius);
  font-family:var(--font-serif); font-size:1.4rem; font-weight:700; letter-spacing:.1em; box-shadow:var(--shadow);
}
.arrow-down{ text-align:center; color:var(--gold); font-size:1.4rem; margin:6px 0; }

/* ---------- guestbook ---------- */
.guestbook-form{ background:var(--paper-2); border:1px solid var(--line); border-radius:var(--radius); padding:30px; }
.guestbook-form label{ display:block; font-size:.85rem; color:var(--ink-soft); margin-bottom:6px; font-weight:600; }
.guestbook-form input, .guestbook-form textarea, .guestbook-form select{
  width:100%; border:1px solid var(--line-strong); background:var(--paper); border-radius:3px;
  padding:11px 13px; font-family:var(--font-sans); font-size:.95rem; color:var(--ink); margin-bottom:18px;
}
.guestbook-form textarea{ min-height:110px; resize:vertical; }
.guestbook-list{ display:flex; flex-direction:column; gap:16px; margin-top:34px; }
.msg{ border:1px solid var(--line); background:var(--paper); border-radius:var(--radius); padding:18px 20px; }
.msg .meta{ display:flex; justify-content:space-between; font-size:.8rem; color:var(--ink-faint); margin-bottom:8px; }
.msg .meta .name{ color:var(--red-deep); font-weight:600; font-family:var(--font-serif); }
.msg .body{ font-size:.95rem; }
.msg .tagpill{ background:var(--paper-2); border:1px solid var(--line-strong); border-radius:20px; padding:2px 10px; font-size:.72rem; }

/* ---------- FAQ accordion ---------- */
.faq-item{ border-bottom:1px solid var(--line); }
.faq-q{
  display:flex; justify-content:space-between; align-items:center; padding:20px 4px; cursor:pointer;
  font-family:var(--font-serif); font-weight:600; font-size:1.05rem;
}
.faq-q .plus{ font-size:1.3rem; color:var(--red); transition:transform .3s; }
.faq-item.open .plus{ transform:rotate(45deg); }
.faq-a{ max-height:0; overflow:hidden; transition:max-height .35s ease; font-size:.93rem; color:var(--ink-soft); }
.faq-item.open .faq-a{ padding-bottom:20px; }

/* ---------- disclaimer banner ---------- */
.disclaimer{
  background:repeating-linear-gradient(135deg, var(--paper-deep), var(--paper-deep) 10px, var(--paper-2) 10px, var(--paper-2) 20px);
  border:1px solid var(--gold); border-radius:var(--radius); padding:22px 26px; font-size:.88rem; color:var(--ink-soft);
  display:flex; gap:16px; align-items:flex-start;
}
.disclaimer .icon{ font-size:1.4rem; flex-shrink:0; }
.disclaimer strong{ color:var(--red-deep); }

/* ---------- footer ---------- */
footer.site{ background:var(--ink); color:rgba(242,232,213,.72); padding:56px 0 30px; }
footer.site .container{ display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:30px; }
footer.site h5{ color:var(--gold-soft); font-family:var(--font-serif); font-size:.95rem; margin-bottom:14px; letter-spacing:.06em; }
footer.site a{ display:block; font-size:.86rem; padding:4px 0; color:rgba(242,232,213,.68); transition:.2s; }
footer.site a:hover{ color:var(--gold-soft); }
footer.site .bottom{
  max-width:var(--maxw); margin:34px auto 0; padding:20px 28px 0; border-top:1px solid rgba(242,232,213,.14);
  font-size:.76rem; color:rgba(242,232,213,.5); display:flex; justify-content:space-between; flex-wrap:wrap; gap:10px;
}
@media (max-width:760px){ footer.site .container{ grid-template-columns:1fr 1fr; } }

/* ---------- page hero (inner pages) ---------- */
.page-hero{
  padding:70px 0 50px; background:linear-gradient(160deg,#1b140d,#2a1c12);
  color:var(--paper); position:relative; overflow:hidden;
}
.page-hero::before{
  content:attr(data-mark); position:absolute; font-family:var(--font-brush); font-size:22rem; line-height:1;
  color:rgba(242,232,213,.04); right:-4%; top:-30%;
}
.page-hero .crumb{ font-size:.78rem; letter-spacing:.2em; color:var(--gold-soft); margin-bottom:16px; }
.page-hero h1{ color:var(--paper); font-size:clamp(2rem,4.4vw,3rem); }
.page-hero p{ color:rgba(242,232,213,.78); max-width:640px; margin-top:14px; }

/* utility */
.mt{ margin-top:40px; }
.center{ text-align:center; }
.small{ font-size:.85rem; color:var(--ink-faint); }
.tag-row{ display:flex; gap:8px; flex-wrap:wrap; margin-top:10px; }