/* =========================================================================
   农业项目数智化管理 · 知识图谱
   Design system — "Agritech Field Notes" editorial theme
   Self-contained: no Tailwind, no Font Awesome. Inline SVG icons in HTML.
   ========================================================================= */

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

/* ---------- Design tokens ---------- */
:root{
  /* ink & paper */
  --paper:        #f8f6f1;   /* warm field-paper, brightened */
  --paper-2:      #f0ece3;   /* deeper paper */
  --card:         #ffffff;   /* raised surface */
  --card-2:       #faf9f6;
  --ink:          #1d2118;   /* near-black warm green */
  --ink-soft:     #4b5043;
  --muted:        #8a8577;
  --rule:         #e0d9c9;   /* hairline rule */
  --rule-soft:    #ebe6d8;

  /* structure / agriculture */
  --forest:       #283a24;   /* deep forest green — primary */
  --forest-2:     #3c5235;
  --moss:         #6f7f4e;

  /* earth accents */
  --clay:         #b5552e;   /* terracotta */
  --clay-soft:    #e9cdbd;
  --amber:        #c08a2e;
  --amber-soft:   #f0e1bd;

  /* digital accent (数智化) */
  --volt:         #8aa83a;   /* chartreuse / electric green */
  --volt-2:       #c9d96a;
  --volt-soft:    #e7eed1;

  /* semantic */
  --blue:         #2f6f86;   --blue-soft:#cfe0e2;
  --grape:        #6b4a7a;   --grape-soft:#e4dcec;
  --rose:         #a4453b;   --rose-soft:#ecd3cf;

  /* shape — slightly softer, more breathing room */
  --r-xs:2px; --r-sm:6px; --r:8px; --r-lg:12px; --r-xl:16px;
  --sh-1: 0 1px 2px rgba(29,33,24,.05);
  --sh-2: 0 8px 30px -12px rgba(29,33,24,.12);
  --sh-3: 0 18px 50px -18px rgba(29,33,24,.16);

  --ff-display:"Noto Serif SC", "Songti SC","STSong","SimSun", serif;
  --ff-body:   "Noto Sans SC", "PingFang SC","Microsoft YaHei", system-ui, sans-serif;
  --ff-mono:   "JetBrains Mono", ui-monospace, "Cascadia Mono", monospace;

  --container: 1240px;
}

/* ---------- Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{ -webkit-text-size-adjust:100%; }
body{
  margin:0;
  font-family:var(--ff-body);
  color:var(--ink);
  background:var(--paper);
  /* faint paper grain via layered radial specks */
  background-image:
    radial-gradient(rgba(40,58,36,.022) 1px, transparent 1.4px),
    radial-gradient(rgba(181,85,46,.015) 1px, transparent 1.4px);
  background-size:24px 24px, 40px 40px;
  background-position:0 0, 12px 12px;
  line-height:1.7;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--forest);text-decoration:none;transition:color .18s, background .18s, border-color .18s}
a:hover{color:var(--clay)}
button{font-family:inherit;cursor:pointer}
h1,h2,h3,h4{font-family:var(--ff-display);font-weight:700;color:var(--forest);line-height:1.25;margin:0}
p{margin:0}

/* ---------- Layout ---------- */
.container{max-width:1400px;margin:0 auto;padding:0 30px}
.wrap{padding-top:42px;padding-bottom:100px}

/* ---------- Top bar ---------- */
.topbar{
  position:sticky;top:0;z-index:40;
  background:var(--paper);
  border-bottom:1px solid var(--rule);
}
.topbar-inner{display:flex;align-items:center;gap:22px;padding-top:14px;padding-bottom:14px}
.brand{display:flex;align-items:center;gap:12px;margin-right:auto}
.brand-mark{
  width:38px;height:38px;border-radius:var(--r-sm);flex:none;
  background:var(--forest);
  display:grid;place-items:center;color:var(--volt-2);
}
.brand-mark svg{width:22px;height:22px}
.brand-text{display:flex;flex-direction:column;line-height:1.1}
.brand-title{font-family:var(--ff-display);font-weight:900;font-size:18px;color:var(--forest);letter-spacing:.01em}
.brand-sub{font-size:11.5px;letter-spacing:.26em;text-transform:uppercase;color:var(--muted);font-family:var(--ff-mono);margin-top:2px}
.nav{display:flex;align-items:center;gap:4px}
.nav a{
  display:inline-flex;align-items:center;gap:7px;
  padding:9px 13px;border-radius:var(--r-sm);
  font-size:14.5px;font-weight:500;color:var(--ink-soft);
  border:1px solid transparent;
}
.nav a svg{width:16px;height:16px;opacity:.85}
.nav a:hover{background:var(--paper-2);color:var(--forest);border-color:var(--rule)}
.nav a.active{background:var(--forest);color:var(--paper);border-color:var(--forest)}
.nav a.active:hover{color:var(--volt-2)}

/* ---------- Breadcrumb ---------- */
.crumb{display:flex;align-items:center;flex-wrap:wrap;gap:8px;font-size:14px;color:var(--muted);margin-bottom:22px}
.crumb a{color:var(--moss);font-weight:500}
.crumb a:hover{color:var(--clay)}
.crumb .sep{opacity:.5}
.crumb .here{color:var(--ink);font-weight:600}

/* ---------- Page header ---------- */
.page-head{margin-bottom:30px}
.eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--ff-mono);font-size:12px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--clay);padding:4px 0;margin-bottom:14px;
  border-bottom:2px solid var(--clay-soft);
}
.page-title{font-size:clamp(32px,4.2vw,56px);font-weight:900;letter-spacing:-.01em}
.page-title .accent{color:var(--clay)}
.page-lead{color:var(--ink-soft);max-width:72ch;margin-top:14px;font-size:19px}
.rule-deco{height:3px;width:64px;background:var(--forest);border-radius:3px;margin-top:18px;position:relative}
.rule-deco::after{content:"";position:absolute;left:70px;top:1px;height:1px;width:120px;background:var(--rule)}

/* ---------- Stat strip ---------- */
.stats{display:grid;grid-template-columns:repeat(6,1fr);gap:0;border:1px solid var(--rule);border-radius:var(--r-lg);overflow:hidden;background:var(--card);box-shadow:var(--sh-1);margin-bottom:30px}
.stat{padding:22px 18px;border-right:1px solid var(--rule-soft);position:relative}
.stat:last-child{border-right:0}
.stat .num{font-family:var(--ff-display);font-weight:900;font-size:34px;color:var(--forest);line-height:1;letter-spacing:-.02em}
.stat .num .u{font-size:15px;color:var(--moss);font-weight:600;margin-left:3px}
.stat .lbl{font-size:14px;color:var(--muted);margin-top:10px;letter-spacing:.02em}
.stat .tick{position:absolute;top:14px;right:14px;width:6px;height:6px;border-radius:var(--r-xs);background:var(--volt);opacity:.6}
@media(max-width:880px){.stats{grid-template-columns:repeat(3,1fr)}.stat{border-bottom:1px solid var(--rule-soft)}.stat:nth-child(3){border-right:0}}

/* ---------- Cards ---------- */
.card{background:var(--card);border:1px solid var(--rule);border-radius:var(--r-lg);transition:transform .25s ease, box-shadow .25s ease;box-shadow:var(--sh-1)}
.card:hover{transform:translateY(-2px);box-shadow:var(--sh-2)}
.card-pad{padding:28px}
.card h3{font-size:18px;display:flex;align-items:center;gap:9px;margin-bottom:16px}
.card h3 svg{width:18px;height:18px;color:var(--moss)}
.section-title{font-family:var(--ff-display);font-weight:700;font-size:15px;letter-spacing:.06em;text-transform:uppercase;color:var(--moss);margin:0 0 12px;display:flex;align-items:center;gap:8px}
.section-title .dot{width:6px;height:6px;border-radius:var(--r-xs);background:var(--clay)}

/* ---------- Tags / chips ---------- */
.tag{display:inline-flex;align-items:center;gap:5px;padding:4px 10px;border-radius:var(--r-sm);font-size:13px;font-weight:600;letter-spacing:.01em;white-space:nowrap;border:1px solid transparent;font-family:var(--ff-body)}
.tag svg{width:12px;height:12px}
.t-forest{background:var(--forest);color:var(--volt-2)}
.t-paper{background:var(--paper-2);color:var(--forest)}
.t-clay{background:var(--clay-soft);color:#8a3d1f}
.t-volt{background:var(--volt-soft);color:#5c7322}
.t-amber{background:var(--amber-soft);color:#825e16}
.t-blue{background:var(--blue-soft);color:#1f5666}
.t-grape{background:var(--grape-soft);color:#4d3359}
.t-rose{background:var(--rose-soft);color:#7d2f26}
.t-ghost{background:transparent;color:var(--muted);border-color:var(--rule)}

/* impact levels */
.imp-high{background:var(--rose-soft);color:#7d2f26}
.imp-mid{background:var(--amber-soft);color:#825e16}
.imp-low{background:var(--volt-soft);color:#5c7322}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 18px;border-radius:var(--r-sm);font-size:14.5px;font-weight:600;border:1px solid transparent;transition:background .18s, color .18s, border-color .18s}
.btn svg{width:16px;height:16px}
.btn-primary{background:var(--forest);color:var(--volt-2)}
.btn-primary:hover{background:var(--ink);color:#fff}
.btn-ghost{background:var(--card);color:var(--forest);border-color:var(--rule)}
.btn-ghost:hover{border-color:var(--forest);background:var(--paper-2)}
.btn-clay{background:var(--clay);color:#fff}
.btn-clay:hover{background:#9a4623;color:#fff}
.btn-sm{padding:6px 11px;font-size:13.5px}
.btn-block{width:100%;justify-content:center}

/* ---------- Classroom showcase login ---------- */
.demo-login-switcher{display:grid;gap:18px;margin-top:18px;padding:22px;border:1px solid var(--amber);border-radius:var(--r-lg);background:linear-gradient(135deg,#fff9e8,#fff);box-shadow:var(--sh-1)}
.demo-login-switcher h2{font-size:23px}.demo-login-switcher p{margin-top:7px;color:var(--ink-soft);font-size:14px}.demo-login-actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px}.demo-login-actions form{margin:0}.demo-login-actions .btn{min-height:44px}
.showcase-entry{display:grid;gap:10px;margin-top:18px;padding:22px;border:1px solid var(--clay);border-radius:var(--r-lg);background:linear-gradient(135deg,#fff4e8,#fff);box-shadow:var(--sh-1)}.showcase-entry h2{font-size:23px}.showcase-entry p{color:var(--ink-soft);font-size:14px}.showcase-home-action{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:18px}.showcase-home-action span{color:var(--ink-soft);font-size:13px}
@media(max-width:480px){.demo-login-actions{grid-template-columns:1fr}}

/* ---------- Forms ---------- */
.field{display:block;margin-bottom:16px}
.field label{display:block;font-size:13.5px;font-weight:600;color:var(--ink-soft);margin-bottom:7px;letter-spacing:.02em}
.input,.select,.textarea{
  width:100%;padding:11px 13px;border:1px solid var(--rule);border-radius:var(--r-sm);
  background:var(--card-2);color:var(--ink);font-family:var(--ff-body);font-size:15px;transition:border-color .15s, box-shadow .15s;
}
.input:focus,.select:focus,.textarea:focus{outline:none;border-color:var(--forest);box-shadow:0 0 0 3px rgba(40,58,36,.12)}
.textarea{resize:vertical;line-height:1.6}

/* ---------- Tables (admin) ---------- */
.tbl{width:100%;border-collapse:collapse;font-size:14.5px}
.tbl th,.tbl td{text-align:left;padding:11px 13px;border-bottom:1px solid var(--rule-soft)}
.tbl th{font-family:var(--ff-mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:600}
.tbl tr:hover td{background:var(--paper-2)}

/* ---------- Utilities ---------- */
.grid{display:grid;gap:24px}
.cols-3{grid-template-columns:1.9fr 1fr}
.cols-2{grid-template-columns:1fr 1fr}
.cols-tree{grid-template-columns:300px 1fr 360px}
.cols-atlas{grid-template-columns:56px minmax(0,1fr) minmax(520px,1.25fr);gap:24px}
@media(max-width:1080px){.cols-tree{grid-template-columns:1fr}.cols-3{grid-template-columns:1fr}.cols-2{grid-template-columns:1fr}}
@media(max-width:960px){.cols-atlas{grid-template-columns:1fr}.week-toggle-col{position:static!important;grid-row:1;margin-bottom:4px}.week-toggle{width:auto;display:inline-flex;gap:8px;padding:9px 14px}}

/* week drawer */
.week-toggle-col{position:sticky;top:90px;align-self:start;z-index:35}
.week-toggle{width:48px;height:48px;display:grid;place-items:center;border-radius:var(--r);border:1px solid var(--rule);background:var(--card);box-shadow:var(--sh-2);color:var(--forest);cursor:pointer;transition:background .2s,border-color .2s,transform .2s}
.week-toggle:hover{background:var(--paper-2);border-color:var(--forest);transform:translateX(2px)}
.week-toggle svg{width:18px;height:18px}
.week-drawer{position:fixed;top:0;left:0;height:100vh;width:320px;max-width:85vw;background:var(--card);border-right:1px solid var(--rule);box-shadow:var(--sh-2);z-index:50;transform:translateX(-100%);transition:transform .3s cubic-bezier(.2,.7,.2,1);display:flex;flex-direction:column}
.week-drawer.open{transform:translateX(0)}
.week-drawer-head{display:flex;align-items:center;gap:12px;padding:16px 18px;border-bottom:1px solid var(--rule);background:var(--paper)}
.week-drawer-head .section-title{margin:0}
.week-drawer-body{flex:1;overflow-y:auto;padding:18px}
.week-drawer-close{margin-left:auto;display:grid;place-items:center;width:30px;height:30px;border-radius:var(--r-sm);border:1px solid var(--rule);background:var(--card);color:var(--muted);cursor:pointer}
.week-drawer-close:hover{color:var(--forest);border-color:var(--forest)}
.drawer-backdrop{position:fixed;inset:0;background:rgba(29,33,24,.35);opacity:0;visibility:hidden;transition:opacity .3s;z-index:45}
.drawer-backdrop.show{opacity:1;visibility:visible}
@media(max-width:760px){
  .week-toggle{width:auto;display:inline-flex;gap:8px;padding:8px 12px}
  .week-drawer{width:280px}
}
.flex{display:flex}
.between{justify-content:space-between;align-items:center}
.wrap-flex{flex-wrap:wrap}
.gap-s{gap:8px}.gap-m{gap:14px}.gap-l{gap:22px}
.center{align-items:center}
.mt-s{margin-top:10px}.mt-m{margin-top:18px}.mt-l{margin-top:28px}
.mb-s{margin-bottom:10px}.mb-m{margin-bottom:18px}
.muted{color:var(--muted)}
.soft{color:var(--ink-soft)}
.small{font-size:13.5px}
.tiny{font-size:12.5px}
.mono{font-family:var(--ff-mono)}
.bold{font-weight:700}
.right{text-align:right}
.sticky-col{position:sticky;top:90px;align-self:start}
.hidden{display:none!important}
.clamp-2{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.clamp-3{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}

/* definition / prose blocks */
.def{background:var(--paper-2);border-left:3px solid var(--forest);padding:14px 18px;border-radius:0 var(--r-sm) var(--r-sm) 0;color:var(--ink-soft);font-size:15px}
.def.clay{border-left-color:var(--clay)}
.def.volt{border-left-color:var(--volt)}
.def.amber{border-left-color:var(--amber)}
.kv{font-family:var(--ff-body);font-size:13px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:var(--moss);margin:12px 0 6px}

/* link rows */
.linkrow{display:flex;gap:12px;align-items:flex-start;padding:11px 13px;border:1px solid var(--rule-soft);border-radius:var(--r-sm);background:var(--card);transition:border-color .15s, background .15s}
.linkrow:hover{border-color:var(--forest);background:var(--paper-2)}
.linkrow .ico{flex:none;width:30px;height:30px;border-radius:var(--r-sm);display:grid;place-items:center;background:var(--paper-2);color:var(--forest)}
.linkrow .ico svg{width:15px;height:15px}
.linkrow .body{min-width:0}
.linkrow .name{font-weight:600;color:var(--ink);font-size:15px;line-height:1.4}
.linkrow .desc{font-size:13px;color:var(--muted);margin-top:4px;display:block;line-height:1.5}

/* empty state */
.empty{text-align:center;padding:38px 18px;color:var(--muted)}
.empty svg{width:36px;height:36px;opacity:.4;margin:0 auto 10px}

/* ---------- Loader ---------- */
.loading{display:block;color:var(--muted);font-size:14px;padding:20px}
.loading .spin{display:inline-block;vertical-align:middle;margin-right:9px}
.spin{width:16px;height:16px;border:2px solid var(--rule);border-top-color:var(--forest);border-radius:50%;animation:spin .8s linear infinite}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---------- Reveal animation ---------- */
.reveal{opacity:0;transform:translateY(10px);animation:reveal .5s cubic-bezier(.2,.7,.2,1) forwards}
@keyframes reveal{to{opacity:1;transform:none}}
.r-d1{animation-delay:.04s}.r-d2{animation-delay:.08s}.r-d3{animation-delay:.12s}.r-d4{animation-delay:.16s}.r-d5{animation-delay:.2s}.r-d6{animation-delay:.24s}

/* ---------- Footer ---------- */
.foot{border-top:1px solid var(--rule);margin-top:60px;padding:26px 0;color:var(--muted);font-size:13px}
.foot-inner{display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px}

/* =========================================================================
   Index page redesign components
   ========================================================================= */

/* ---------- Stats v2 ---------- */
.stats-v2{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-bottom:36px}
.stat-v2{
  background:var(--card);border:1px solid var(--rule);border-radius:var(--r-lg);
  padding:26px 24px;box-shadow:var(--sh-1);transition:transform .25s ease,box-shadow .25s ease;
  display:flex;flex-direction:column;gap:6px;position:relative;overflow:hidden
}
.stat-v2:hover{transform:translateY(-3px);box-shadow:var(--sh-2)}
.stat-v2::before{
  content:"";position:absolute;top:0;left:0;right:0;height:4px;background:var(--forest);opacity:.9
}
.stat-v2:nth-child(2)::before{background:var(--volt)}
.stat-v2:nth-child(3)::before{background:var(--clay)}
.stat-v2 .num{font-family:var(--ff-display);font-weight:900;font-size:42px;color:var(--forest);line-height:1;letter-spacing:-.02em}
.stat-v2 .num .u{font-size:17px;color:var(--moss);font-weight:600;margin-left:4px}
.stat-v2 .lbl{font-size:15px;color:var(--muted);font-weight:500}
.stat-v2 .sub{display:flex;gap:14px;flex-wrap:wrap;margin-top:10px;font-size:13px;color:var(--muted)}
.stat-v2 .sub span{display:inline-flex;align-items:center;gap:5px}
.stat-v2 .sub b{color:var(--ink-soft);font-weight:700}

/* ---------- Atlas layout ---------- */
.cols-atlas-v2{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(360px,1fr);gap:28px;align-items:start}

/* ---------- Toolbar (week bar + search) ---------- */
.atlas-toolbar{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin-bottom:18px}
.week-bar{
  flex:1 1 auto;min-width:0;display:flex;gap:8px;overflow-x:auto;padding-bottom:4px;
  scrollbar-width:thin;scrollbar-color:var(--rule) transparent
}
.week-bar::-webkit-scrollbar{height:5px}
.week-bar::-webkit-scrollbar-thumb{background:var(--rule);border-radius:3px}
.week-bar::after{
  content:"";position:absolute;right:0;top:0;bottom:6px;width:40px;
  background:linear-gradient(90deg,transparent,var(--card));pointer-events:none;opacity:0;
  transition:opacity .2s
}
.week-bar-wrap{position:relative;flex:1 1 auto;min-width:220px}
.week-bar-wrap.can-scroll::after{opacity:1}
.week-chip{
  flex:none;display:inline-flex;align-items:center;gap:7px;
  padding:7px 13px;border-radius:var(--r-sm);border:1px solid var(--rule);
  background:var(--card-2);color:var(--ink-soft);font-size:13.5px;font-weight:500;
  cursor:pointer;transition:all .18s;white-space:nowrap
}
.week-chip:hover{border-color:var(--forest);color:var(--forest);background:var(--paper-2)}
.week-chip.active{background:var(--forest);color:var(--paper);border-color:var(--forest)}
.week-chip .num{font-family:var(--ff-mono);font-weight:700;font-size:12px;opacity:.8}
.week-chip.active .num{color:var(--volt-2);opacity:1}

.search-field{position:relative;flex:none;width:260px}
.search-field svg{position:absolute;left:12px;top:50%;transform:translateY(-50%);color:var(--muted);width:16px;height:16px}
.search-field input{width:100%;padding:9px 12px 9px 36px;border:1px solid var(--rule);border-radius:var(--r-sm);background:var(--card-2);font-size:14px;transition:border-color .15s,box-shadow .15s}
.search-field input:focus{outline:none;border-color:var(--forest);box-shadow:0 0 0 3px rgba(40,58,36,.10)}

/* ---------- Knowledge tree ---------- */
.knowledge-tree{display:flex;flex-direction:column;gap:8px}
.node-l1{
  background:var(--card);border:1px solid var(--rule);border-radius:var(--r-lg);
  overflow:hidden;box-shadow:var(--sh-1);transition:box-shadow .2s,border-color .2s
}
.node-l1:hover{box-shadow:var(--sh-2);border-color:var(--rule)}
.node-l1-head{
  display:flex;align-items:center;gap:14px;padding:16px 18px;cursor:pointer;
  border-left:4px solid var(--forest);transition:background .18s
}
.node-l1-head:hover{background:var(--paper-2)}
.node-l1-head .meta{flex:1;min-width:0}
.node-l1-head .title{color:var(--forest);font-family:var(--ff-display);font-weight:700;font-size:17px;line-height:1.35}
.node-l1-head .tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:7px}
.node-l1-head .chev{
  width:26px;height:26px;border-radius:var(--r-sm);display:grid;place-items:center;
  color:var(--moss);background:var(--paper-2);transition:transform .25s ease,background .18s;
  flex:none
}
.node-l1-head:hover .chev{background:var(--rule-soft)}
.node-l1.open .node-l1-head .chev{transform:rotate(180deg)}

.l2-list{
  max-height:0;overflow:hidden;transition:max-height .45s cubic-bezier(.2,.7,.2,1)
}
.l2-list.open{max-height:5000px}

.node-l2{border-top:1px solid var(--rule-soft)}
.node-l2-head{
  display:flex;align-items:center;gap:12px;padding:12px 18px 12px 42px;cursor:pointer;
  transition:background .18s
}
.node-l2-head:hover{background:var(--paper-2)}
.node-l2-head .title{color:var(--blue);font-weight:600;font-size:15px;line-height:1.35}
.node-l2-head .chev{width:20px;height:20px;color:var(--muted);transition:transform .25s ease;flex:none}
.node-l2.open .node-l2-head .chev{transform:rotate(180deg)}

.l3-list{
  max-height:0;overflow:hidden;transition:max-height .4s cubic-bezier(.2,.7,.2,1)
}
.l3-list.open{max-height:3000px}

.node-l3{
  display:flex;align-items:center;gap:10px;padding:10px 18px 10px 66px;
  border-top:1px dashed var(--rule-soft);font-size:14px;color:var(--ink-soft);
  transition:background .15s
}
.node-l3:hover{background:var(--paper-2)}
.node-l3 .dot{width:6px;height:6px;border-radius:50%;background:var(--amber);flex:none}
.node-l3 .name{flex:1;min-width:0}
.node-l3 .ext{color:var(--muted);width:16px;height:16px;flex:none;opacity:.6;transition:opacity .15s,transform .15s}
.node-l3:hover .ext{opacity:1;transform:translateX(2px)}

/* ---------- Detail panel ---------- */
.detail-panel{
  position:sticky;top:90px;align-self:start;
  max-height:calc(100vh - 110px);overflow-y:auto;
  scrollbar-width:thin;scrollbar-color:var(--rule) transparent;
  min-height:260px
}
.detail-panel::-webkit-scrollbar{width:6px}
.detail-panel::-webkit-scrollbar-thumb{background:var(--rule);border-radius:3px}
.detail-empty{text-align:center;padding:60px 20px;color:var(--muted)}

.workshop-card{border:1px solid color-mix(in srgb,var(--amber) 54%,var(--rule));border-left:4px solid var(--amber);border-radius:var(--r);background:var(--paper-2);padding:18px}
.workshop-card .kv{margin-top:12px!important}
.workshop-card h4{font-family:var(--ff-display);font-size:20px;color:var(--forest);margin:5px 0 8px}
.workshop-card p{color:var(--ink);line-height:1.75}
.workshop-card ol{margin:12px 0 12px 20px;color:var(--muted);line-height:1.7}
.workshop-output{border-top:1px solid var(--rule);padding-top:11px;font-size:13px;line-height:1.7;color:var(--forest)}
.workshop-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.detail-panel .info-card ul{margin:8px 0 0 18px;line-height:1.7}

.detail-empty svg{width:44px;height:44px;opacity:.35;margin:0 auto 14px}
.detail-header{margin-bottom:18px}
.detail-header .tags{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:10px}
.detail-header h3{font-size:22px;color:var(--forest);line-height:1.3;margin:0}
.detail-section{margin-top:22px}
.detail-section:first-child{margin-top:0}
.detail-section .section-title{margin-bottom:12px}
.info-card{
  background:var(--card-2);border:1px solid var(--rule);border-radius:var(--r-sm);
  padding:16px 18px;position:relative;overflow:hidden
}
.info-card::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--forest)
}
.info-card.volt::before{background:var(--volt)}
.info-card.amber::before{background:var(--amber)}
.info-card.clay::before{background:var(--clay)}
.info-card .kv{margin:0 0 6px}
.info-card p:last-child{margin-bottom:0}

/* ---------- Loading skeleton ---------- */
.skeleton{animation:skeleton-pulse 1.6s ease-in-out infinite;background:linear-gradient(90deg,var(--paper-2) 25%,var(--card) 50%,var(--paper-2) 75%);background-size:200% 100%;border-radius:var(--r-sm)}
@keyframes skeleton-pulse{0%{background-position:200% 0}100%{background-position:-200% 0}}
.skeleton-text{height:14px;margin-bottom:10px;border-radius:4px}
.skeleton-title{height:18px;width:40%;margin-bottom:16px}
.skeleton-row{height:48px;margin-bottom:10px}

/* ---------- Custom scrollbar ---------- */
::-webkit-scrollbar{width:8px;height:8px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--rule);border-radius:4px}
::-webkit-scrollbar-thumb:hover{background:var(--muted)}

/* ---------- Mobile / responsive ---------- */
@media(max-width:1080px){
  .cols-atlas-v2{grid-template-columns:1fr}
  .search-field{width:100%}
  .atlas-toolbar{flex-direction:column;align-items:stretch}
  .week-bar-wrap{order:2}
  .search-field{order:1}
  .detail-panel{position:static;max-height:none;overflow-y:visible}
}
@media(max-width:760px){
  body{font-size:16px}
  .nav{gap:0}
  .nav a span.lbl{display:none}
  .nav a{padding:9px 11px}
  .brand-sub{display:none}
  .container{padding:0 18px}
  .wrap{padding-top:28px;padding-bottom:70px}
  .page-title{font-size:clamp(28px,7vw,40px)}
  .page-lead{font-size:17px}
  .card h3{font-size:17px}
  .stats-v2{grid-template-columns:1fr}
  .stat-v2{padding:20px 18px}
  .stat-v2 .num{font-size:34px}
  .node-l1-head{padding:14px 16px}
  .node-l1-head .title{font-size:16px}
  .node-l2-head{padding:11px 16px 11px 32px}
  .node-l3{padding:10px 16px 10px 52px}
  .week-chip{padding:6px 11px;font-size:13px}
}

/* ---------- Case detail enhancements ---------- */

/* semantic tag palette */
.t-brand{background:#f3e8ff;color:#7c3aed;border-color:#ddd6fe}
.t-policy{background:#ffedd5;color:#ea580c;border-color:#fed7aa}
.t-society{background:#dcfce7;color:#16a34a;border-color:#bbf7d0}
.t-tech{background:#dbeafe;color:#2563eb;border-color:#bfdbfe}
.t-market{background:#fef3c7;color:#b45309;border-color:#fde68a}

/* case hero */
.case-hero-v2{
  display:grid;
  grid-template-columns:1.15fr 1fr;
  gap:36px;
  align-items:center;
  padding:36px 40px;
  background:linear-gradient(135deg, var(--card) 0%, var(--paper-2) 100%);
  border:1px solid var(--rule);
  border-radius:var(--r-lg);
  box-shadow:var(--sh-2);
  overflow:hidden;
  position:relative
}
.case-hero-v2::before{
  content:"";position:absolute;top:0;left:0;width:5px;height:100%;
  background:linear-gradient(180deg, var(--theme-color, var(--forest)), var(--theme-color-2, var(--moss)));
  opacity:.85
}
.case-hero-content{position:relative;z-index:1}
.case-hero-v2 .eyebrow{
  font-family:var(--ff-mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);font-weight:600
}
.case-hero-v2 .page-title{font-size:clamp(30px,4vw,48px);font-weight:900;line-height:1.1;margin-top:10px}
.case-hero-v2 .page-title .accent{display:block;color:var(--theme-color, var(--clay));font-size:.72em;font-weight:700;margin-top:6px}
.case-hero-v2 .page-subtitle{
  font-size:clamp(18px,2.2vw,24px);color:var(--ink-soft);font-weight:500;margin-top:8px;line-height:1.4
}
.case-hero-v2 .hero-tags{display:flex;flex-wrap:wrap;gap:9px;margin:18px 0 14px}
.case-hero-v2 .page-lead{color:var(--ink-soft);font-size:17px;line-height:1.75;max-width:62ch}
.case-hero-media{
  position:relative;border-radius:var(--r);overflow:hidden;
  box-shadow:var(--sh-2);aspect-ratio:16/10;background:var(--paper-2)
}
.case-hero-media img{width:100%;height:100%;object-fit:cover}
.case-hero-media .caption{
  position:absolute;bottom:0;left:0;right:0;padding:10px 14px;
  background:linear-gradient(transparent, rgba(29,33,24,.75));color:#fff;font-size:12.5px
}
.case-hero-footer{margin-top:22px}
.case-hero-v2 .stats-v2{margin-bottom:0;margin-top:24px}
.case-hero-v2 .stat-v2:nth-child(3n+1)::before{background:var(--theme-color, var(--forest))}
.case-hero-v2 .stat-v2:nth-child(3n+2)::before{background:var(--theme-color-2, var(--volt))}
.case-hero-v2 .stat-v2:nth-child(3n+3)::before{background:var(--theme-color-3, var(--clay))}

@media(max-width:980px){
  .case-hero-v2{grid-template-columns:1fr;padding:28px}
  .case-hero-media{aspect-ratio:16/9;max-height:360px}
}

/* definition boxes with semantic colors */
.def-v2{
  background:var(--card-2);border:1px solid var(--rule-soft);
  border-left:4px solid var(--theme-color, var(--forest));
  border-radius:0 var(--r-sm) var(--r-sm) 0;padding:18px 20px;margin:16px 0;
  box-shadow:var(--sh-1)
}
.def-v2 .def-title{
  font-family:var(--ff-display);font-weight:700;color:var(--forest);font-size:16px;margin-bottom:8px;
  display:flex;align-items:center;gap:8px
}
.def-v2 .def-title::before{
  content:"";width:6px;height:6px;border-radius:50%;background:var(--theme-color, var(--forest))
}
.def-v2 p{color:var(--ink-soft);font-size:15px;line-height:1.7;margin:0}
.def-v2.def-brand{border-left-color:#7c3aed;background:#faf7ff}
.def-v2.def-policy{border-left-color:#ea580c;background:#fffaf5}
.def-v2.def-society{border-left-color:#16a34a;background:#f6fff9}
.def-v2.def-tech{border-left-color:#2563eb;background:#f5f9ff}

/* data table caption & source */
.table-block{margin:18px 0}
.table-caption{
  font-family:var(--ff-display);font-weight:700;font-size:17px;color:var(--forest);margin-bottom:10px
}
.table-block .data-table,.table-block .md-table{margin-top:0;background:var(--card)}
.source-note{
  font-size:12.5px;color:var(--muted);margin-top:8px;display:flex;align-items:center;gap:6px
}
.source-note::before{content:"来源：";font-weight:600;color:var(--muted)}

/* timeline improvements */
.timeline-v2{position:relative;padding-left:28px}
.timeline-v2::before{
  content:"";position:absolute;left:8px;top:8px;bottom:8px;width:2px;
  background:linear-gradient(180deg, var(--theme-color, var(--forest)), var(--theme-color-2, var(--moss)));
  border-radius:2px
}
.tl-item-v2{position:relative;margin-bottom:24px}
.tl-item-v2::before{
  content:"";position:absolute;left:-26px;top:4px;width:13px;height:13px;border-radius:50%;
  background:var(--card);border:3px solid var(--theme-color, var(--clay));box-shadow:0 0 0 3px var(--paper)
}
.tl-item-v2 .phase{font-family:var(--ff-display);font-weight:700;color:var(--forest);font-size:16px}
.tl-item-v2 .time{
  display:inline-block;font-family:var(--ff-mono);font-size:12px;color:var(--muted);
  background:var(--paper-2);padding:2px 8px;border-radius:var(--r-sm);margin-left:8px
}
.tl-item-v2 .txt{font-size:15px;color:var(--ink-soft);margin-top:6px;line-height:1.7}

/* figure card */
.figure-card{margin:18px 0}
.figure-card img{width:100%;height:auto;border-radius:var(--r-sm);box-shadow:var(--sh-1)}
.figure-card figcaption{font-size:13px;color:var(--muted);margin-top:9px;text-align:center}

/* TOC / sidebar */
.toc-v2{display:flex;flex-direction:column;gap:4px}
.toc-v2 a{
  display:flex;align-items:baseline;gap:10px;padding:10px 12px;border-radius:var(--r-sm);
  color:var(--ink-soft);font-size:14.5px;transition:background .15s,color .15s
}
.toc-v2 a:hover{background:var(--paper-2);color:var(--forest)}
.toc-v2 a .num{
  font-family:var(--ff-mono);font-size:11px;color:var(--muted);min-width:20px
}
.toc-v2 a.active{background:var(--theme-color-soft, var(--paper-2));color:var(--theme-color, var(--forest));font-weight:600}
.sidebar-sticky{
  position:sticky;top:92px;align-self:start;display:flex;flex-direction:column;gap:20px;
  max-height:calc(100vh - 110px);overflow-y:auto;scrollbar-width:thin;scrollbar-color:var(--rule) transparent
}
.sidebar-sticky::-webkit-scrollbar{width:5px}
.sidebar-sticky::-webkit-scrollbar-thumb{background:var(--rule);border-radius:3px}

/* discussion questions */
.questions-list{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:14px}
.questions-list li{
  background:var(--card-2);border:1px solid var(--rule-soft);border-radius:var(--r-sm);
  padding:16px 18px 16px 48px;position:relative;font-size:15.5px;color:var(--ink-soft);line-height:1.7
}
.questions-list li::before{
  content:attr(data-idx);position:absolute;left:16px;top:16px;
  font-family:var(--ff-display);font-weight:900;font-size:20px;color:var(--theme-color, var(--clay));opacity:.8
}

/* theme utilities (injected via JS) */
.theme-blueberry{--theme-color:#4f46e5;--theme-color-2:#7c3aed;--theme-color-3:#2563eb;--theme-color-soft:#eef2ff}
.theme-cherry{--theme-color:#c41e3a;--theme-color-2:#8b0000;--theme-color-3:#d4a574;--theme-color-soft:#fff1f2}

/* section component layout */
.section-components{display:flex;flex-direction:column;gap:18px}
.section-components > *:last-child{margin-bottom:0}
.subsections{display:flex;flex-direction:column;gap:22px;margin-top:18px}
.sub-section{padding:18px 20px;background:var(--card-2);border:1px solid var(--rule-soft);border-radius:var(--r-sm)}
.sub-heading{font-family:var(--ff-display);font-size:18px;font-weight:700;color:var(--forest);margin:0 0 10px}
.sub-section p{color:var(--ink-soft);line-height:1.75;margin-bottom:12px}
.sub-section p:last-child{margin-bottom:0}