/* ── TOKENS ─────────────────────────────────────────── */
:root{
  /* ── Light base ── */
  --bg:#ffffff;
  --bg2:#f5f5f7;
  --bg3:#e8e8ed;
  --bg4:#d2d2d7;
  /* ── Dark sections ── */
  --dark:#000000;
  --dark2:#111111;
  --dark3:#1a1a1a;
  /* ── Typography ── */
  --ink:#1d1d1f;
  --soft:#3d3d3f;
  --muted:#6e6e73;
  --faint:#86868b;
  /* ── Borders / surfaces ── */
  --line:rgba(0,0,0,.08);
  --line2:rgba(0,0,0,.05);
  --panel:rgba(0,0,0,.03);
  --panel2:rgba(0,0,0,.05);
  /* ── Primary accent (monochrome) ── */
  --blue:#1d1d1f;
  --blue-lt:#3d3d3f;
  --cyan:#6e6e73;
  /* ── Semantic / functional colors ── */
  --green:#1a5c38;
  --yellow:#7a5200;
  --red:#b91c1c;
  --purple:#4c1d95;
  --orange:#92400e;
  /* ── Dark-section overrides ── */
  --ds-ink:#f5f5f7;
  --ds-soft:#a1a1a6;
  --ds-muted:#6e6e73;
  --ds-line:rgba(255,255,255,.08);
  --ds-panel:rgba(255,255,255,.04);
  --ds-blue:#f5f5f7;
  --ds-cyan:#a1a1a6;
  /* ── Misc ── */
  --radius:12px; --r-sm:8px; --r-lg:16px;
  --blue-dim:rgba(29,29,31,.06); --green-dim:rgba(29,29,31,.06);
  --font:"Inter",-apple-system,sans-serif;
  --mono:"JetBrains Mono",monospace;
  --nav-h:62px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;overflow-x:hidden}
body{background:var(--bg);color:var(--ink);font-family:var(--font);font-size:16px;line-height:1.6;overflow-x:hidden;-webkit-font-smoothing:antialiased}
a{color:inherit;text-decoration:none}
img{display:block;max-width:100%}
button{cursor:pointer;border:none;background:none;font:inherit;color:inherit}
ul,ol{list-style:none}
code,pre{font-family:var(--mono)}
input,select,textarea{font-family:var(--font)}

/* ── TYPOGRAPHY ─────────────────────────────────────── */
.d1{font-size:clamp(42px,7vw,88px);font-weight:900;line-height:1.02;letter-spacing:-0.04em}
.d2{font-size:clamp(32px,5vw,64px);font-weight:800;line-height:1.07;letter-spacing:-0.03em}
.d3{font-size:clamp(24px,3.5vw,44px);font-weight:700;line-height:1.12;letter-spacing:-0.02em}
h4{font-size:18px;font-weight:600;line-height:1.3;letter-spacing:-0.01em}
.label{font-size:10px;font-weight:600;letter-spacing:0.16em;text-transform:uppercase;color:var(--muted)}
.lead{font-size:clamp(16px,2vw,20px);color:var(--soft);line-height:1.65}
p{color:var(--muted);line-height:1.75}

/* ── LAYOUT ─────────────────────────────────────────── */
.wrap{max-width:1200px;margin:0 auto;padding:0 48px}
.section-wide{max-width:1440px;margin:0 auto;padding:0 48px}
.wrap-lg{max-width:1440px;margin:0 auto;padding:0 48px}
.section{padding:120px 0}
.section-sm{padding:80px 0}
.divider{height:1px;background:var(--line)}

/* ── BUTTONS ─────────────────────────────────────────── */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 24px;border-radius:8px;font-size:14px;font-weight:600;transition:all .18s ease;white-space:nowrap;letter-spacing:.01em}
.btn-primary{background:var(--ink);color:#fff}
.btn-primary:hover{background:var(--soft);transform:translateY(-1px);box-shadow:0 6px 24px rgba(0,0,0,.18)}
.btn-ghost{border:1px solid rgba(0,0,0,.12);color:var(--soft);background:transparent}
.btn-ghost:hover{border-color:rgba(0,0,0,.25);color:var(--ink);background:var(--panel2)}
.btn-lg{padding:15px 32px;font-size:16px;border-radius:10px}
.btn-group{display:flex;gap:12px;flex-wrap:wrap;align-items:center}

/* ── TOPBAR ──────────────────────────────────────────── */
#topbar{
  position:fixed;top:42px;left:0;right:0;z-index:900;
  height:var(--nav-h);display:flex;align-items:center;
  transition:box-shadow .25s;
  background:rgba(255,255,255,.96);
  backdrop-filter:blur(24px);-webkit-backdrop-filter:blur(24px);
  border-bottom:1px solid var(--line);
  box-shadow:0 1px 0 rgba(0,0,0,.05);
}
#topbar.scrolled{
  box-shadow:0 2px 8px rgba(0,0,0,.07);
}
.nav-inner{display:flex;align-items:center;justify-content:space-between;width:100%;max-width:1440px;margin:0 auto;padding:0 48px}
.logo{font-size:22px;font-weight:800;letter-spacing:-0.03em;color:var(--ink);display:flex;align-items:center;gap:0;flex-shrink:0;transition:color .25s}
.logo .s{color:#0057ff}
.nav-links{display:flex;align-items:center;gap:2px}
.nav-links a{padding:7px 14px;border-radius:7px;font-size:13px;font-weight:500;color:var(--muted);transition:color .15s,background .15s;letter-spacing:.01em}
.nav-links a:hover,.nav-links a.active{color:var(--ink);background:var(--panel2)}
.nav-right{display:flex;align-items:center;gap:10px}
.hub-cta{padding:8px 18px;border-radius:7px;background:var(--ink);color:#fff;font-size:13px;font-weight:700;transition:all .18s;letter-spacing:.01em}
.hub-cta:hover{background:var(--soft);transform:translateY(-1px)}
.lh-nav-hub{display:inline-flex;align-items:center;gap:5px;padding:8px 15px;border-radius:7px;background:#0057ff;color:#fff!important;font-size:13px;font-weight:700;letter-spacing:.01em;transition:all .18s;white-space:nowrap;text-decoration:none}
.lh-nav-hub:hover{background:#2268ff;transform:translateY(-1px);box-shadow:0 4px 16px rgba(0,87,255,.3)}
.hamburger{display:none;flex-direction:column;gap:5px;padding:8px;cursor:pointer}
.hamburger span{display:block;width:22px;height:2px;background:var(--soft);border-radius:2px;transition:.2s}
#mobile-nav{display:none;position:fixed;inset:0;z-index:950;background:rgba(5,7,13,.98);backdrop-filter:blur(24px);flex-direction:column;align-items:center;justify-content:center;gap:6px}
#mobile-nav.open{display:flex}
#mobile-nav a{font-size:26px;font-weight:800;color:var(--soft);padding:12px 40px;letter-spacing:-0.02em}
#mobile-nav a:hover{color:var(--ink)}
.mob-close{position:absolute;top:20px;right:24px;font-size:32px;color:var(--muted);cursor:pointer}


/* ── DARK SECTIONS (hero, dramatic CTAs) ──────────────── */
.ds{background:var(--dark);color:var(--ds-ink)}
.ds p,.ds .lead{color:var(--ds-soft)}
.ds .label{color:var(--ds-muted)}
.ds h1,.ds h2,.ds h3{color:var(--ds-ink)}
.ds .stat-l{color:var(--ds-muted)}
.ds .stat-n{color:var(--ds-ink)}
.ds .stat-n span{color:var(--ds-blue)}
.ds .tag{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.12);color:var(--ds-soft)}
.ds .btn-ghost{border-color:rgba(255,255,255,.2);color:var(--ds-soft)}
.ds .btn-ghost:hover{border-color:rgba(255,255,255,.4);color:var(--ds-ink);background:rgba(255,255,255,.06)}

/* ── HERO ─────────────────────────────────────────────── */
#hero{
  min-height:100vh;display:grid;grid-template-columns:1fr 1fr;
  align-items:center;padding-top:calc(var(--nav-h) + 42px);position:relative;overflow:hidden;
  background:var(--bg);color:var(--ink);
}
#hero h1{color:var(--ink)}
#hero p,#hero .lead{color:var(--muted)}
#hero .label{color:var(--muted)}
#hero .hero-sub{color:var(--muted)}
#hero .hero-meta-item{color:var(--faint)}
#hero .hero-meta-num{color:var(--soft)}
.hero-bg-grid{
  position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(0,0,0,.03) 1px,transparent 1px),
    linear-gradient(90deg,rgba(0,0,0,.03) 1px,transparent 1px);
  background-size:80px 80px;
  mask-image:radial-gradient(ellipse 70% 80% at 30% 50%,black 0%,transparent 100%);
  -webkit-mask-image:radial-gradient(ellipse 70% 80% at 30% 50%,black 0%,transparent 100%);
}
.hero-glow{display:none}
.hero-text{padding:clamp(60px,8vh,120px) 60px clamp(60px,8vh,100px) clamp(28px,4vw,60px);display:flex;flex-direction:column;justify-content:center;position:relative;z-index:1}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:5px 14px 5px 10px;border-radius:24px;
  border:1px solid rgba(0,0,0,.1);background:rgba(0,0,0,.04);
  font-size:10px;font-weight:600;letter-spacing:0.14em;text-transform:uppercase;color:var(--muted);
  margin-bottom:36px;
}
.hero-badge-dot{width:5px;height:5px;border-radius:50%;background:var(--faint);animation:pulse 2.2s ease infinite}
.hero-text h1{color:var(--ink)}
.hero-text h1 em{font-style:normal;color:var(--ink);-webkit-text-fill-color:var(--ink);background:none}
.hero-sub{margin-top:24px;max-width:460px;font-size:clamp(16px,1.8vw,19px);color:var(--muted);line-height:1.65}
.hero-actions{margin-top:40px;display:flex;gap:12px;flex-wrap:wrap}
.hero-meta{margin-top:52px;display:flex;align-items:center;gap:24px;flex-wrap:wrap}
.hero-meta-item{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--faint)}
.hero-meta-sep{color:var(--line);font-size:18px;line-height:1}
.hero-meta-num{font-size:16px;font-weight:800;color:var(--soft);font-family:var(--mono)}
.hero-visual{
  display:flex;align-items:center;justify-content:center;
  position:relative;overflow:visible;
}
.hero-visual-glow{display:none}
.robot-frame{position:relative;display:flex;align-items:center;justify-content:center}
.robot-img{
  height:clamp(420px,52vh,660px);width:auto;object-fit:contain;
  position:relative;z-index:1;
  filter:drop-shadow(0 40px 80px rgba(0,0,0,.12));
}
.chip{
  position:absolute;z-index:2;
  display:flex;align-items:center;gap:7px;padding:7px 14px;
  border-radius:8px;background:rgba(255,255,255,.94);border:1px solid rgba(0,0,0,.08);
  backdrop-filter:blur(14px);font-size:11px;font-weight:600;color:var(--soft);
  white-space:nowrap;animation:float 4s ease-in-out infinite;letter-spacing:.01em;
  box-shadow:0 4px 16px rgba(0,0,0,.06);
}
.chip-dot{width:7px;height:7px;border-radius:50%;flex-shrink:0}
.c1{top:18%;left:-30px;animation-delay:0s}
.c2{top:36%;right:-44px;animation-delay:.8s}
.c3{bottom:36%;left:-50px;animation-delay:1.6s}
.c4{bottom:20%;right:-36px;animation-delay:2.4s}

/* ── STATS STRIP ─────────────────────────────────────── */
#stats{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:var(--bg)}
.stats-inner{display:grid;grid-template-columns:repeat(5,1fr);width:100%;max-width:1440px;margin:0 auto}
.stat{
  padding:36px 40px;border-right:1px solid var(--line);
  display:flex;flex-direction:column;gap:4px;
}
.stat:last-child{border-right:none!important}
.stat-n{font-size:36px;font-weight:900;letter-spacing:-0.04em;color:var(--ink);line-height:1}
.stat-n span{color:var(--ink)}
.stat-l{font-size:13px;font-weight:500;color:var(--muted);margin-top:4px}

/* ── PLATFORM SECTION ────────────────────────────────── */
#platform-sec{background:#fff}
.plat-grid{display:grid;grid-template-columns:1fr 1fr;gap:80px;align-items:center}
.plat-content{display:flex;flex-direction:column}
.plat-text .label{margin-bottom:16px;display:block}
.plat-text p{font-size:17px;color:var(--muted);line-height:1.75;margin-top:16px;max-width:480px}
.plat-features{margin-top:48px;display:flex;flex-direction:column;gap:1px;background:var(--line);border-radius:18px;overflow:hidden;border:1px solid rgba(0,0,0,.08)}
.plat-feat{
  background:var(--bg2);padding:24px 28px;
  display:flex;align-items:flex-start;gap:18px;
  transition:background .2s;
}
.plat-feat:hover{background:var(--bg2)}
.plat-icon{width:36px;height:36px;border-radius:8px;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.plat-icon.blue{background:var(--panel2)}
.plat-icon.green{background:var(--panel2)}
.plat-icon.purple{background:var(--panel2)}
.plat-icon-mark{width:14px;height:14px;border-radius:2px;background:var(--ink);opacity:.35}
.plat-feat h4{margin-bottom:4px}
.plat-feat p{font-size:14px;color:var(--muted);margin:0}
.plat-visual{position:relative}
.plat-img-wrap{border-radius:20px;overflow:hidden;border:1px solid var(--line);position:relative}
.plat-img-wrap img{width:100%;object-fit:cover;display:block}
.plat-img-wrap::after{content:'';position:absolute;inset:0;background:linear-gradient(135deg,rgba(95,183,255,.08),transparent 60%)}
.plat-specs{
  position:absolute;bottom:20px;left:20px;right:20px;
  background:rgba(5,7,13,.85);backdrop-filter:blur(16px);
  border:1px solid var(--line);border-radius:12px;
  padding:16px 20px;display:grid;grid-template-columns:repeat(3,1fr);gap:16px;
}
.plat-spec-item{text-align:center}
.plat-spec-val{font-size:18px;font-weight:800;color:var(--blue);letter-spacing:-0.02em}
.plat-spec-key{font-size:11px;color:var(--muted);margin-top:2px}

/* ── LEARNING SECTION ────────────────────────────────── */
#learning-sec{background:var(--bg2)}
.learning-head{text-align:center;max-width:640px;margin:0 auto}
.learning-head .label{margin-bottom:12px;display:block}
.learning-head p{margin-top:14px}
.quarters{
  display:grid;grid-template-columns:repeat(4,1fr);gap:1px;
  background:var(--line);border-radius:20px;overflow:hidden;
  border:1px solid var(--line);margin-top:60px;
}
.qcard{background:#fff;border:1px solid rgba(0,0,0,.08);box-shadow:0 2px 12px rgba(0,0,0,.06);padding:36px 28px;transition:background .2s,box-shadow .2s;position:relative;overflow:hidden}
.qcard:hover{background:var(--bg4)}
.qcard::before{content:'';position:absolute;top:0;left:0;right:0;height:2px}
.qcard.q1::before{background:var(--blue)}
.qcard.q2::before{background:var(--cyan)}
.qcard.q3::before{background:var(--green)}
.qcard.q4::before{background:var(--purple)}
.q-num{font-size:11px;font-weight:700;letter-spacing:0.12em;text-transform:uppercase;margin-bottom:10px}
.qcard.q1 .q-num{color:var(--blue)}
.qcard.q2 .q-num{color:var(--cyan)}
.qcard.q3 .q-num{color:var(--green)}
.qcard.q4 .q-num{color:var(--purple)}
.q-title{font-size:22px;font-weight:800;letter-spacing:-0.02em;margin-bottom:8px}
.q-desc{font-size:14px;color:var(--muted);line-height:1.6;margin-bottom:20px}
.q-skills{display:flex;flex-direction:column;gap:7px}
.q-skill{font-size:13px;color:var(--soft);display:flex;align-items:center;gap:8px}
.q-skill::before{content:'';width:5px;height:5px;border-radius:50%;flex-shrink:0;background:currentColor;opacity:.5}
.qcard.q1 .q-skill::before{color:var(--blue)}
.qcard.q2 .q-skill::before{color:var(--cyan)}
.qcard.q3 .q-skill::before{color:var(--green)}
.qcard.q4 .q-skill::before{color:var(--purple)}
.q-footer{margin-top:24px;padding-top:20px;border-top:1px solid var(--line);font-size:12px;color:var(--faint);font-weight:600}

/* ── DEMOS PREVIEW ───────────────────────────────────── */
#demos-preview{background:var(--bg)}
.demos-head{display:flex;align-items:flex-end;justify-content:space-between;gap:40px;margin-bottom:48px;flex-wrap:wrap}
.demos-head p{font-size:15px;color:var(--muted);max-width:400px}
.demo-cards{display:grid;grid-template-columns:repeat(5,minmax(160px,1fr));gap:1px;background:var(--line);border-radius:20px;overflow:hidden;border:1px solid var(--line)}
.demo-card{background:#fff;border:1px solid rgba(0,0,0,.08);padding:28px 24px;display:flex;flex-direction:column;gap:10px;transition:background .2s,box-shadow .2s;cursor:pointer}
.demo-card:hover{background:var(--bg2);box-shadow:0 4px 20px rgba(0,87,255,.08)}
.demo-num{font-size:11px;font-weight:700;letter-spacing:0.1em;text-transform:uppercase;color:var(--faint)}
.demo-icon{font-size:28px;margin:4px 0}
.demo-card h4{font-size:16px;font-weight:700;letter-spacing:-0.01em}
.demo-card p{font-size:13px;color:var(--muted);margin:0;line-height:1.5}
.demo-tag{margin-top:auto;display:inline-flex;align-items:center;gap:5px;font-size:11px;font-weight:600;color:var(--blue)}

/* ── COMPARE SECTION ─────────────────────────────────── */
#compare-sec{background:#fff}
.compare-head-txt{max-width:560px;margin-bottom:56px}
.compare-head-txt .label{margin-bottom:12px;display:block}
.compare-head-txt p{margin-top:12px}
.compare-table{border-radius:20px;overflow:hidden;border:1px solid var(--line)}
.ct-head{display:grid;grid-template-columns:2.2fr 1fr 1fr 1.2fr;background:var(--bg3);border-bottom:1px solid var(--line);border-radius:var(--radius) var(--radius) 0 0;overflow:hidden}
.ct-cell{padding:18px 24px;font-size:12px;font-weight:700;letter-spacing:0.08em;text-transform:uppercase;color:var(--muted)}
.ct-cell.hi{color:var(--blue)}
.ct-row{display:grid;grid-template-columns:2.2fr 1fr 1fr 1.2fr;border-bottom:1px solid var(--line2);transition:background .15s}
.ct-row:last-child{border-bottom:none}
.ct-row:hover{background:var(--panel)}
.ct-val{padding:16px 24px;font-size:14px;color:var(--muted);display:flex;align-items:center}
.ct-val.feature{color:var(--soft);font-weight:500}
.ct-val.hi{color:var(--ink)}
.ck{color:var(--green);font-size:17px;font-weight:800}
.cx{color:var(--faint);font-size:17px}
.cp{color:var(--yellow);font-size:13px;font-weight:600}
.compare-note{margin-top:20px;text-align:center;font-size:14px;font-style:italic;color:var(--muted)}

/* ── SCHOOLS CTA ─────────────────────────────────────── */
#schools-cta{background:#000000}
.cta-split{display:grid;grid-template-columns:1fr 1fr;gap:1px;background:rgba(255,255,255,.06);border-radius:16px;overflow:hidden;border:1px solid rgba(255,255,255,.08)}
.cta-side{padding:72px 56px}
.cta-side.left{background:rgba(255,255,255,.03)}
.cta-side.right{background:rgba(255,255,255,.05);border-left:1px solid rgba(255,255,255,.08)}
.cta-side .label{margin-bottom:16px;display:block;color:rgba(180,210,255,.7)}
.cta-side h2{font-size:clamp(26px,3vw,40px);font-weight:800;letter-spacing:-0.025em;margin-bottom:14px;color:#edf5ff}
.cta-side>p{font-size:15px;color:rgba(200,220,240,.75);margin-bottom:32px;max-width:400px}
.cta-list{display:flex;flex-direction:column;gap:12px;margin-bottom:36px}
.cta-list li{display:flex;align-items:flex-start;gap:10px;font-size:14px;color:rgba(200,220,240,.85)}
.cta-list li::before{content:'→';color:#5fb7ff;font-weight:700;flex-shrink:0;margin-top:1px}
.contact-form{display:flex;flex-direction:column;gap:14px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.field{display:flex;flex-direction:column;gap:6px}
.field label{font-size:11px;font-weight:700;color:var(--muted);letter-spacing:0.09em;text-transform:uppercase}
.field input,.field select,.field textarea{padding:11px 15px;border-radius:10px;background:var(--bg);border:1px solid var(--line);color:var(--ink);font-family:var(--font);font-size:14px;transition:border-color .15s;outline:none}
.field input:focus,.field select:focus,.field textarea:focus{border-color:var(--blue)}
.field select{appearance:none;cursor:pointer;color:var(--soft)}
.field textarea{min-height:90px;resize:vertical;line-height:1.5}
.field input::placeholder,.field textarea::placeholder{color:var(--faint)}
.form-submit{padding:14px;border-radius:8px;background:#ffffff;color:#000000;font-size:14px;font-weight:700;transition:all .18s;width:100%;letter-spacing:.01em}
.form-submit:hover{background:rgba(255,255,255,.88);transform:translateY(-1px)}
.form-note{font-size:12px;color:var(--faint);text-align:center}

/* ── FOOTER ──────────────────────────────────────────── */
#footer{background:#fff;border-top:1px solid var(--line);padding:72px 0 40px}
.footer-logo{color:var(--ink) !important}
.footer-logo .s{color:#0057ff !important}
.footer-top{display:grid;grid-template-columns:2fr 1fr 1fr;gap:48px;margin-bottom:60px}
.footer-brand .logo{font-size:20px;margin-bottom:14px;display:inline-flex}
.footer-brand p{font-size:14px;color:var(--muted);max-width:260px;line-height:1.65}
.footer-col h5{font-size:11px;font-weight:700;letter-spacing:0.12em;text-transform:uppercase;color:var(--faint);margin-bottom:18px}
.footer-col ul{display:flex;flex-direction:column;gap:10px}
.footer-col a{font-size:14px;color:var(--muted);transition:color .15s}
.footer-col a:hover{color:var(--ink)}
.footer-bottom{border-top:1px solid var(--line);padding-top:24px;display:flex;align-items:center;justify-content:space-between}
.footer-copy{font-size:13px;color:var(--faint)}
.footer-sub{display:flex;gap:24px}
.footer-sub a{font-size:13px;color:var(--faint);transition:color .15s}
.footer-sub a:hover{color:var(--muted)}

/* ── PAGE SYSTEM ─────────────────────────────────────── */
.pg{display:none}
.pg.active{display:block}
#pg-home{display:block}
.stub-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding-top:calc(var(--nav-h) + 42px)}
.stub-box{text-align:center;max-width:480px;padding:0 24px}
.stub-box .label{margin-bottom:12px;display:block}
.stub-box h2{font-size:36px;font-weight:800;letter-spacing:-0.025em;margin-bottom:12px}
.stub-box p{color:var(--muted);margin-bottom:28px}

/* ── LEARNING HUB OVERLAY ────────────────────────────── */
#hub{display:none;position:fixed;inset:0;z-index:1000;background:#f7f8fc;flex-direction:column;color:#1a1f2e}
#hub.open{display:flex}

/* Hub top bar */
.hub-bar{
  height:54px;display:flex;align-items:center;gap:20px;padding:0 24px;
  border-bottom:1px solid rgba(255,255,255,.08);background:#ffffff;border-bottom:1px solid #e2e6ee;flex-shrink:0;
}
.hub-back{display:flex;align-items:center;gap:6px;font-size:14px;font-weight:600;color:#556080;transition:color .15s;cursor:pointer}
.hub-back:hover{color:#0057ff}
.hub-back svg{width:16px;height:16px;stroke:currentColor;fill:none;stroke-width:2.5}
.hub-bar-title{font-size:15px;font-weight:700;color:#1a1f2e;flex:1;text-align:center}
.hub-search-wrap{position:relative}
.hub-search{padding:7px 14px 7px 34px;border-radius:8px;background:#f0f3f8;border:1px solid #dde2ee;color:#1a1f2e;font-size:13px;width:220px;outline:none;transition:border-color .15s}
.hub-search:focus{border-color:#0057ff;background:#fff;box-shadow:0 0 0 3px rgba(0,87,255,.08)}
.hub-search-icon{position:absolute;left:10px;top:50%;transform:translateY(-50%);color:#9aadc0;pointer-events:none}

/* Hub shell */
.hub-shell{display:flex;flex:1;overflow:hidden}

/* Sidebar */
.hub-sidebar{
  width:280px;flex-shrink:0;border-right:1px solid rgba(255,255,255,.08);
  overflow-y:auto;background:#f0f2f8;
}
.hub-sidebar::-webkit-scrollbar{width:3px}
.hub-sidebar::-webkit-scrollbar-thumb{background:#c5cdd8;border-radius:2px}
.sidebar-section{padding:20px 0 8px}
.sidebar-section-label{
  padding:0 20px 8px;
  font-size:10px;font-weight:800;letter-spacing:0.14em;text-transform:uppercase;color:#9aadc0;
}
.sidebar-module{border-bottom:1px solid #e4e8f0}
.sidebar-module-header{
  display:flex;align-items:center;justify-content:space-between;
  padding:12px 20px;cursor:pointer;transition:background .15s;
  font-size:14px;font-weight:700;color:#2a3650;
}
.sidebar-module-header:hover{background:rgba(0,87,255,.04)}
.sidebar-module-header .arrow{width:16px;height:16px;stroke:#9aadc0;fill:none;stroke-width:2.5;transition:transform .2s;flex-shrink:0}
.sidebar-module-header.open .arrow{transform:rotate(180deg)}
.sidebar-module-items{display:none;padding:4px 0 8px}
.sidebar-module-items.open{display:block}
.sidebar-item{
  display:flex;align-items:center;padding:8px 20px 8px 32px;
  font-size:13px;color:#556080;cursor:pointer;
  border-left:2px solid transparent;transition:all .15s;
  line-height:1.4;
}
.sidebar-item:hover{color:#1a1f2e;background:rgba(0,87,255,.04);border-left-color:#9aadc0}
.sidebar-item.active{color:#0057ff;border-left-color:#0057ff;background:rgba(0,87,255,.07);font-weight:600}

/* Hub content */
.hub-content-wrap{display:flex;flex:1;overflow:hidden}
.hub-content{flex:1;overflow-y:auto;padding:0}
.hub-content::-webkit-scrollbar{width:5px}
.hub-content::-webkit-scrollbar-thumb{background:var(--faint);border-radius:3px}
.hub-article{display:none;max-width:860px;margin:0 auto;padding:56px 64px}
.hub-main{flex:1;overflow-y:auto;background:#ffffff}
.hub-article.show{display:block}
/* breadcrumb */
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:13px;color:#9aadc0;margin-bottom:36px}
.breadcrumb a{color:#9aadc0;transition:color .15s}
.breadcrumb a:hover{color:#0057ff}
.breadcrumb .sep{color:var(--faint)}
.breadcrumb .current{color:#556080}
/* article content */
.hub-article h1{font-size:clamp(30px,4vw,46px);font-weight:900;letter-spacing:-0.03em;line-height:1.08;margin-bottom:20px;color:#1a1f2e}
#hub .hub-article h1,#hub .hub-article h2,#hub .hub-article h3{color:#1a1f2e}
#hub .hub-article p,#hub .hub-article li,#hub .hub-article td,#hub .hub-article th{color:#374060}
#hub .hub-article .article-lead{color:#3d5070}
#hub .hub-article code{background:#f0f3f8;color:#0057ff;border:1px solid #dde2ee}
#hub .hub-article a{color:#0057ff}
#hub .hub-article a:hover{text-decoration:underline}
.article-lead{font-size:17px;color:#3d5070;line-height:1.75;padding:22px 26px;border-left:3px solid var(--blue);background:rgba(95,183,255,.05);border-radius:0 10px 10px 0;margin-bottom:36px}
.article-meta{display:flex;align-items:center;gap:20px;margin-bottom:40px;padding-bottom:24px;border-bottom:1px solid var(--line)}
.article-meta-item{font-size:13px;color:var(--faint);display:flex;align-items:center;gap:6px}
.article-meta-item strong{color:var(--muted);font-weight:600}
.hub-article h2{font-size:24px;font-weight:800;letter-spacing:-0.02em;margin:48px 0 16px;color:var(--ink);padding-top:8px}
.hub-article h3{font-size:18px;font-weight:700;letter-spacing:-0.01em;margin:32px 0 12px;color:var(--soft)}
.hub-article p{font-size:15px;color:var(--soft);margin-bottom:16px;line-height:1.8}
.hub-article ul,.hub-article ol{margin-bottom:20px;display:flex;flex-direction:column;gap:8px}
.hub-article li{font-size:15px;color:var(--soft);padding-left:22px;position:relative;line-height:1.7}
.hub-article ul li::before{content:'→';position:absolute;left:0;color:var(--blue);font-weight:800;font-size:12px;top:4px}
.hub-article ol{counter-reset:li}
.hub-article ol li{counter-increment:li}
.hub-article ol li::before{content:counter(li)'.';position:absolute;left:0;color:var(--blue);font-weight:700;font-size:12px}

/* code */
.code-wrap{border-radius:12px;overflow:hidden;border:1px solid var(--line);margin:20px 0}
.code-header{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;background:#0d1117;border-bottom:1px solid rgba(255,255,255,.06)}
.code-lang{font-size:11px;font-weight:700;color:var(--muted);letter-spacing:0.1em;text-transform:uppercase}
.copy-btn{font-size:11px;font-weight:600;color:var(--muted);padding:4px 10px;border-radius:6px;border:1px solid var(--line);transition:all .15s}
.copy-btn:hover{color:var(--ink);border-color:var(--muted)}
.copy-btn.ok{color:var(--green);border-color:rgba(125,255,189,.4)}
pre[class*="language-"]{margin:0!important;border-radius:0!important;background:#0d1117!important;font-size:13px!important;line-height:1.75!important}
/* terminal */
.term{border-radius:12px;overflow:hidden;border:1px solid var(--line);margin:20px 0}
.term-bar{display:flex;align-items:center;gap:7px;padding:10px 16px;background:#0d1117;border-bottom:1px solid rgba(255,255,255,.06)}
.t-dot{width:11px;height:11px;border-radius:50%}
.td-r{background:#ff5f57}.td-y{background:#febc2e}.td-g{background:#28c840}
.term-label{font-size:12px;color:var(--muted);margin-left:4px;font-family:var(--mono)}
.term-body{background:#040810;padding:20px 24px;font-family:var(--mono);font-size:13px;color:var(--green);line-height:1.85;overflow-x:auto}
.term-body .tc{color:var(--cyan)}.term-body .ty{color:var(--yellow)}.term-body .tm{color:var(--muted)}.term-body .tf{color:var(--faint)}
/* callout boxes */
.callout{border-radius:10px;padding:18px 22px;margin:24px 0;border-left:3px solid}
.callout.tip{border-color:var(--green);background:rgba(125,255,189,.06)}
.callout.note{border-color:var(--blue);background:rgba(95,183,255,.06)}
.callout.warn{border-color:var(--yellow);background:rgba(255,209,102,.06)}
.callout.danger{border-color:var(--red);background:rgba(255,123,123,.06)}
.callout-label{font-size:10px;font-weight:800;letter-spacing:0.13em;text-transform:uppercase;margin-bottom:8px}
.callout.tip .callout-label{color:var(--green)}
.callout.note .callout-label{color:var(--blue)}
.callout.warn .callout-label{color:var(--yellow)}
.callout.danger .callout-label{color:var(--red)}
.callout p{font-size:14px;margin:0;line-height:1.65;color:var(--soft)}
/* robot reality box */
.rr-box{border-left:3px solid var(--yellow);background:rgba(255,209,102,.05);border-radius:0 10px 10px 0;padding:18px 22px;margin:24px 0}
.rr-label{font-size:10px;font-weight:800;letter-spacing:0.13em;text-transform:uppercase;color:var(--yellow);margin-bottom:8px}
.rr-box p{font-size:14px;color:var(--soft);margin:0;line-height:1.7}
/* next article */
.hub-next{margin-top:60px;padding-top:24px;border-top:1px solid var(--line)}
.hub-next-card{
  display:flex;align-items:center;justify-content:space-between;
  padding:20px 26px;border:1px solid var(--line);border-radius:14px;
  transition:border-color .2s,background .2s;cursor:pointer;
}
.hub-next-card:hover{border-color:rgba(95,183,255,.4);background:rgba(95,183,255,.05)}
.hub-next-sub{font-size:12px;color:var(--muted);font-weight:600;text-transform:uppercase;letter-spacing:.08em;margin-bottom:4px}
.hub-next-title{font-size:17px;font-weight:700;color:var(--ink)}
.hub-next-arrow{font-size:22px;color:var(--blue)}
/* hub file path */
.file-path{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;background:#0c1524;border:1px solid rgba(255,255,255,.1);border-radius:8px;font-family:var(--mono);font-size:12px;color:#7af1ff;margin:8px 0 20px}
/* tag */
.tag{display:inline-flex;align-items:center;padding:3px 9px;border-radius:6px;font-size:11px;font-weight:700;background:var(--bg3);border:1px solid var(--line);color:var(--muted)}
.tag.blue{background:rgba(95,183,255,.1);color:var(--blue);border-color:rgba(95,183,255,.2)}
.tag.green{background:rgba(125,255,189,.08);color:var(--green);border-color:rgba(125,255,189,.18)}
.tag.yellow{background:rgba(255,209,102,.08);color:var(--yellow);border-color:rgba(255,209,102,.18)}
/* ── CARD SYSTEM ─────────────────────────────────────── */
.card{
  background:#fff;
  border-radius:var(--radius);
  border:1px solid rgba(0,0,0,.08);
  box-shadow:0 2px 8px rgba(0,0,0,.06),0 1px 2px rgba(0,0,0,.04);
  transition:border-color .2s,box-shadow .2s,transform .2s;
  overflow:hidden;
  position:relative;
}
.card:hover{
  border-color:rgba(0,87,255,.2);
  box-shadow:0 8px 32px rgba(0,0,0,.10),0 2px 8px rgba(0,0,0,.06);
  transform:translateY(-2px);
}
.card.glow-blue:hover{border-color:rgba(0,87,255,.3);box-shadow:0 8px 32px rgba(0,87,255,.12),0 2px 8px rgba(0,0,0,.06)}
.card.glow-cyan:hover{border-color:rgba(0,153,204,.3);box-shadow:0 8px 32px rgba(0,153,204,.12),0 2px 8px rgba(0,0,0,.06)}
.card.glow-green:hover{border-color:rgba(0,128,74,.3);box-shadow:0 8px 32px rgba(0,128,74,.12),0 2px 8px rgba(0,0,0,.06)}
.card.glow-yellow:hover{border-color:rgba(179,93,0,.3);box-shadow:0 8px 32px rgba(179,93,0,.10),0 2px 8px rgba(0,0,0,.06)}
.card.glow-purple:hover{border-color:rgba(109,40,217,.3);box-shadow:0 8px 32px rgba(109,40,217,.12),0 2px 8px rgba(0,0,0,.06)}
/* card accent top bar */
.card-accent{height:2px;width:100%;display:block}
.card-accent.blue{background:linear-gradient(90deg,var(--blue),var(--cyan))}
.card-accent.cyan{background:linear-gradient(90deg,var(--cyan),var(--blue))}
.card-accent.green{background:linear-gradient(90deg,var(--green),var(--cyan))}
.card-accent.yellow{background:linear-gradient(90deg,var(--yellow),var(--orange))}
.card-accent.purple{background:linear-gradient(90deg,var(--purple),var(--blue))}
.card-accent.orange{background:linear-gradient(90deg,var(--orange),var(--yellow))}
/* card body */
.card-body{padding:28px}
.card-body-sm{padding:20px 24px}
/* demo number badge */
.demo-num{
  display:inline-flex;align-items:center;justify-content:center;
  width:32px;height:32px;border-radius:8px;font-family:var(--mono);
  font-size:13px;font-weight:800;margin-bottom:16px;
}
.demo-num.blue{background:rgba(0,87,255,.08);color:var(--blue)}
.demo-num.cyan{background:rgba(0,153,204,.1);color:var(--cyan)}
.demo-num.green{background:rgba(0,128,74,.1);color:var(--green)}
.demo-num.yellow{background:rgba(179,93,0,.08);color:var(--yellow)}
.demo-num.purple{background:rgba(109,40,217,.08);color:var(--purple)}

/* difficulty badge */
.diff{display:inline-flex;align-items:center;gap:5px;padding:4px 10px;border-radius:6px;font-size:11px;font-weight:700}
.diff.easy{background:rgba(125,255,189,.1);color:var(--green)}
.diff.med{background:rgba(255,209,102,.1);color:var(--yellow)}
.diff.hard{background:rgba(255,123,123,.1);color:var(--red)}
/* access / safety tier badges */
.safe-green{display:inline-block;padding:3px 10px;border-radius:6px;font-size:11px;font-weight:700;background:rgba(125,255,189,.12);color:var(--green)}
.safe-yellow{display:inline-block;padding:3px 10px;border-radius:6px;font-size:11px;font-weight:700;background:rgba(255,209,102,.12);color:var(--yellow)}
.safe-red{display:inline-block;padding:3px 10px;border-radius:6px;font-size:11px;font-weight:700;background:rgba(255,123,123,.12);color:var(--red)}
/* lab starter code */
.todo-comment{color:#ffd166 !important}
/* section divider inside articles */
.art-divider{height:1px;background:var(--line);margin:40px 0}

/* ── ANIMATIONS ──────────────────────────────────────── */
@keyframes pulse{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.4;transform:scale(1.5)}}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-7px)}}
@keyframes fadeUp{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}

/* ── SCROLLBAR ───────────────────────────────────────── */
::-webkit-scrollbar{width:7px;height:7px}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--faint);border-radius:4px}

/* ── RESPONSIVE ──────────────────────────────────────── */
@media(max-width:1100px){
  #hero{grid-template-columns:1fr}.hero-visual{display:none}
  .hero-text{padding:100px 0 80px}
  .plat-grid{grid-template-columns:1fr;gap:48px}.plat-visual{display:none}
  .quarters{grid-template-columns:1fr 1fr}
  .demo-cards{grid-template-columns:1fr 1fr 1fr}
  .footer-top{grid-template-columns:1fr 1fr;gap:32px}
  .cta-split{grid-template-columns:1fr}
  .ct-head,.ct-row{grid-template-columns:2fr 1fr 1.2fr}
  .ct-cell:nth-child(3),.ct-val:nth-child(3){display:none}
}
@media(max-width:768px){
  .wrap,.wrap-lg,.section-wide{padding:0 20px}
  .nav-inner{padding:0 20px}
  .nav-links{display:none}.hamburger{display:flex}
  /* ensure hamburger tap target is large enough */
  .hamburger{padding:10px;margin:-4px}
  .nav-right .btn-ghost{display:none}
  .lh-nav-hub{display:none!important}
  .section{padding:80px 0}.section-sm{padding:60px 0}
  .stats-inner{grid-template-columns:1fr 1fr}
  .stat:nth-child(5){grid-column:1/-1}
  .stat{padding:28px 24px}
  .stat-n{font-size:32px}
  .quarters{grid-template-columns:1fr}
  .demo-cards{grid-template-columns:1fr 1fr}
  .footer-top{grid-template-columns:1fr}
  /* footer column gaps on single-column layout */
  .footer-col{padding-top:4px}
  .form-row{grid-template-columns:1fr}
  .cta-side{padding:48px 24px}
  .hub-sidebar{width:240px}
  .hub-article{padding:40px 24px}
  .hub-content{padding:0}
  .hero-text{padding:80px 20px 60px}
  .hero-actions{flex-direction:column;align-items:flex-start}
  .hero-actions .btn-lg{width:auto}
  .hero-meta{gap:16px;flex-wrap:wrap}
  /* floating chip badges — negative positions cause horizontal overflow */
  .chip{display:none}
  /* hero visual panel on single-column layout */
  .hero-visual-panel{padding:8px 20px 40px !important}
  .hero-visual-panel .robot-img{height:auto !important;width:100% !important;max-height:280px;object-fit:contain}
  /* prevent any table/grid from causing horizontal scroll */
  .compare-table,.ct-head,.ct-row{overflow-x:auto}
  /* mobile-nav link tap target */
  #mobile-nav a{padding:14px 32px;font-size:24px}
}
@media(max-width:520px){
  .demo-cards{grid-template-columns:1fr}
  .hub-sidebar{display:none}
  .d1{font-size:clamp(32px,9vw,48px)}
  .d2{font-size:clamp(26px,7.5vw,38px)}
  .d3{font-size:clamp(20px,6.5vw,30px)}
  .cta-side{padding:36px 20px}
  .section{padding:60px 0}
  .hero-meta-sep{display:none}
  .hero-meta{flex-direction:column;gap:8px;align-items:flex-start}
  .hero-visual-panel .robot-img{max-height:220px}
  /* shrink announce bar text so it stays on one line */
  #announce-bar{font-size:10px;padding:7px 16px}
  /* tighter section headings on tiny screens */
  .section-wide h2,.wrap h2{font-size:clamp(22px,6vw,34px)}
  /* stats strip: 3 per row on very narrow screens */
  .stats-inner{grid-template-columns:repeat(3,1fr)!important}
  .stat{padding:20px 12px}
  .stat-n{font-size:26px}
  .stat-l{font-size:11px}
}

/* ══════════════════════════════════════════════════════
   HUB ENHANCEMENTS v2
   ══════════════════════════════════════════════════════ */

/* ── Article page navigator ── */
.art-pages{display:flex;align-items:center;gap:8px;margin-bottom:40px;padding-bottom:20px;border-bottom:1px solid #eaeef5}
.art-page-dot{width:28px;height:28px;border-radius:50%;border:1px solid #dde2ee;background:#fff;color:#9aadc0;font-size:12px;font-weight:700;cursor:pointer;transition:all .2s;display:flex;align-items:center;justify-content:center}
.art-page-dot:hover{border-color:rgba(0,87,255,.4);color:#0057ff}
.art-page-dot.active{background:#0057ff;border-color:#0057ff;color:#fff}
.art-nav-bar{display:flex;align-items:center;justify-content:space-between;margin-top:56px;padding-top:24px;border-top:1px solid #eaeef5}
.art-nav-btn{display:inline-flex;align-items:center;gap:8px;padding:10px 20px;border-radius:10px;border:1px solid #dde2ee;background:#f0f3f8;color:#374060;font-size:13px;font-weight:600;cursor:pointer;transition:all .2s;text-decoration:none}
.art-nav-btn:hover{border-color:rgba(0,87,255,.35);color:#0057ff;background:rgba(0,87,255,.06)}
.art-nav-btn.primary{background:rgba(0,87,255,.08);border-color:rgba(0,87,255,.25);color:#0057ff}
.art-nav-btn.primary:hover{background:rgba(0,87,255,.14)}
.art-read-time{font-size:12px;color:rgba(200,220,240,.4);display:flex;align-items:center;gap:6px}

/* ── Quick reference panel ── */
.hub-content-wrap{display:flex;gap:0;flex:1;overflow:hidden}
.hub-main{flex:1;overflow-y:auto;padding:0}
.hub-qref{width:220px;flex-shrink:0;background:#f7f8fc;border-left:1px solid #e2e6ee;overflow-y:auto;padding:20px 16px;display:none}
.hub-qref.visible{display:block}
.hub-qref h4{font-size:10px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:#9aadc0;margin:0 0 10px;margin-top:20px}
.hub-qref h4:first-child{margin-top:0}
.hub-qref-item{font-size:12px;color:#556080;padding:5px 8px;border-radius:6px;margin-bottom:3px;line-height:1.4;cursor:default;transition:background .15s}
.hub-qref-item:hover{background:rgba(0,87,255,.05);color:#1a1f2e}
.hub-qref-item code{background:rgba(95,183,255,.1);color:#5fb7ff;border-radius:3px;padding:1px 4px;font-size:11px;font-family:var(--mono)}
.hub-qref-tag{display:inline-block;padding:2px 6px;border-radius:4px;font-size:10px;font-weight:700;margin-right:4px;margin-bottom:3px}
.qref-topic{background:rgba(0,87,255,.08);color:#0057ff}
.qref-cmd{background:rgba(0,140,180,.08);color:#006fa6}
.qref-err{background:rgba(255,100,100,.1);color:#ff8888}
.qref-term{background:rgba(0,128,74,.08);color:#00804a}

/* ── Code annotation toggle ── */
.code-wrap{position:relative;margin:28px 0}
.code-explain-btn{position:absolute;top:10px;right:44px;padding:4px 10px;border-radius:6px;border:1px solid rgba(255,255,255,.15);background:rgba(255,255,255,.08);color:rgba(220,235,255,.7);font-size:11px;font-weight:600;cursor:pointer;transition:all .2s;z-index:2;font-family:var(--mono)}
.code-explain-btn:hover{border-color:rgba(95,183,255,.4);color:#5fb7ff}
.code-explain-btn.on{background:rgba(95,183,255,.12);border-color:rgba(95,183,255,.3);color:#5fb7ff}
.annotated-line{display:flex;gap:0;align-items:baseline}
.annotated-line .ann{display:none;font-size:11px;color:rgba(122,241,255,.5);font-style:italic;margin-left:16px;white-space:nowrap;font-family:var(--mono)}
.code-annotations-on .annotated-line .ann{display:inline}

/* ── Tiered code tabs ── */
.code-tier-tabs{display:flex;gap:0;margin-bottom:-1px;position:relative;z-index:1}
.code-tier-tab{padding:7px 16px;font-size:12px;font-weight:700;font-family:var(--mono);border:1px solid rgba(255,255,255,.1);border-bottom:none;border-radius:8px 8px 0 0;cursor:pointer;background:#0d1117;color:rgba(200,220,240,.45);transition:all .2s}
.code-tier-tab:hover{color:#c9d9eb}
.code-tier-tab.active{background:#161b22;color:#5fb7ff;border-color:rgba(95,183,255,.25);border-bottom:1px solid #161b22}
.code-tier-panel{display:none}
.code-tier-panel.active{display:block}
.code-tier-panel pre{border-radius:0 8px 8px 8px!important;margin-top:0!important}

/* ── What Breaks If table ── */
.breaks-table{width:100%;border-collapse:collapse;margin:24px 0;font-size:13px}
.breaks-table th{background:rgba(255,75,75,.08);color:#ff8888;font-size:10px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;padding:10px 14px;text-align:left;border-bottom:1px solid rgba(255,100,100,.15)}
.breaks-table td{padding:10px 14px;border-bottom:1px solid rgba(255,255,255,.06);color:#c9d9eb;vertical-align:top}
.breaks-table td:first-child{color:#ffd166;font-family:var(--mono);font-size:12px}
.breaks-table td:nth-child(2){color:#ff9999}
.breaks-table td:last-child{color:#7dffbd}
.breaks-table tr:last-child td{border-bottom:none}
.breaks-table tr:hover td{background:rgba(255,255,255,.02)}
.breaks-label{display:flex;align-items:center;gap:8px;font-size:10px;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:#ff8888;margin-bottom:10px}
.breaks-label::before{content:'';display:block;width:3px;height:14px;background:#ff8888;border-radius:2px}

/* ── Lab self-assessment checklist ── */
.lab-checklist{background:rgba(0,128,74,.04);border:1px solid rgba(0,128,74,.15);border-radius:14px;padding:24px 28px;margin-top:48px}
.lab-checklist h3{font-size:13px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:#00804a;margin:0 0 16px}
.lab-check-item{display:flex;align-items:flex-start;gap:12px;padding:10px 0;border-bottom:1px solid rgba(0,128,74,.08);cursor:pointer;user-select:none}
.lab-check-item:last-child{border-bottom:none;padding-bottom:0}
.lab-check-box{width:20px;height:20px;border-radius:5px;border:2px solid #b8d8c8;flex-shrink:0;margin-top:1px;display:flex;align-items:center;justify-content:center;transition:all .2s}
.lab-check-item.checked .lab-check-box{background:#00804a;border-color:#00804a}
.lab-check-item.checked .lab-check-box::after{content:'✓';font-size:12px;font-weight:900;color:#05070d}
.lab-check-item.checked .lab-check-text{color:rgba(200,220,240,.4);text-decoration:line-through}
.lab-check-text{font-size:14px;color:#374060;line-height:1.4}

/* ── Concept map ── */
.concept-map-wrap{background:#f0f3f8;border:1px solid #dde2ee;border-radius:16px;padding:24px;overflow-x:auto;margin:32px 0}
.concept-map-wrap svg text{font-family:var(--mono)}
.cmap-node{cursor:pointer;transition:filter .2s}
.cmap-node:hover{filter:brightness(1.2)}

/* ── Troubleshooting flowchart ── */
.flow-chart-wrap{background:#f0f3f8;border:1px solid #dde2ee;border-radius:16px;padding:24px;overflow-x:auto;margin:28px 0}
.flow-node-yes{fill:rgba(125,255,189,.15);stroke:rgba(125,255,189,.4)}
.flow-node-no{fill:rgba(255,120,120,.12);stroke:rgba(255,120,120,.35)}
.flow-node-action{fill:rgba(95,183,255,.1);stroke:rgba(95,183,255,.35)}
.flow-node-start{fill:rgba(200,132,252,.12);stroke:rgba(200,132,252,.4)}

/* ── Error encyclopedia ── */
#pg-errors .err-grid{display:flex;flex-direction:column;gap:12px;margin-top:24px}
.err-card{background:#fff;border-radius:12px;border:1px solid rgba(0,0,0,.07);overflow:hidden;cursor:pointer;transition:box-shadow .2s,border-color .2s}
.err-card:hover{border-color:rgba(0,87,255,.2);box-shadow:0 4px 16px rgba(0,0,0,.08)}
.err-card-head{display:flex;align-items:center;gap:12px;padding:14px 18px;background:#fafafa}
.err-code{font-family:var(--mono);font-size:12px;font-weight:700;color:#c42b00;background:rgba(196,43,0,.06);padding:4px 10px;border-radius:6px;border:1px solid rgba(196,43,0,.12);flex-shrink:0}
.err-title{font-size:14px;font-weight:600;color:var(--ink);flex:1}
.err-cat{font-size:10px;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.err-body{padding:0 18px;max-height:0;overflow:hidden;transition:max-height .3s ease,padding .3s}
.err-card.open .err-body{max-height:400px;padding:14px 18px 18px}
.err-row{display:grid;grid-template-columns:110px 1fr;gap:8px 16px;margin-bottom:8px;font-size:13px}
.err-row-label{color:var(--muted);font-weight:600;font-size:11px;padding-top:2px}
.err-row-val{color:var(--soft)}
.err-fix{color:#00804a;font-weight:600}
.err-search-wrap{position:relative;max-width:480px;margin-bottom:32px}
.err-search{width:100%;padding:12px 16px 12px 42px;border-radius:10px;border:1px solid rgba(0,0,0,.1);background:#fff;font-size:14px;color:var(--ink);outline:none;font-family:var(--font);box-shadow:0 1px 4px rgba(0,0,0,.06)}
.err-search:focus{border-color:rgba(0,87,255,.35);box-shadow:0 0 0 3px rgba(0,87,255,.08)}
.err-search-icon{position:absolute;left:14px;top:50%;transform:translateY(-50%);color:var(--faint)}
.err-filter-bar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:24px}
.err-filter-btn{padding:6px 14px;border-radius:20px;border:1px solid rgba(0,0,0,.1);background:#fff;font-size:12px;font-weight:600;cursor:pointer;transition:all .15s;color:var(--muted)}
.err-filter-btn:hover{border-color:rgba(0,87,255,.3);color:var(--blue)}
.err-filter-btn.active{background:var(--blue);border-color:var(--blue);color:#fff}

/* ── ANNOUNCEMENT BAR ── */
#announce-bar{position:fixed;top:0;left:0;right:0;z-index:901;background:#1d1d1f;border-bottom:1px solid rgba(255,255,255,.08);padding:10px 0;text-align:center;font-size:12px;font-weight:500;color:rgba(255,255,255,.55);letter-spacing:.02em}
#announce-bar a{color:rgba(255,255,255,.8);text-decoration:none;border-bottom:1px solid rgba(255,255,255,.25);padding-bottom:1px;transition:color .15s}
#announce-bar a:hover{color:#fff}
/* ── INSTITUTION STRIP ── */
.inst-strip{background:var(--bg);border-bottom:1px solid var(--line);padding:32px 0}
.inst-strip-inner{display:flex;align-items:center;gap:40px;max-width:1200px;margin:0 auto;padding:0 48px;flex-wrap:wrap}
.inst-label{font-size:11px;font-weight:600;letter-spacing:.14em;text-transform:uppercase;color:var(--faint);white-space:nowrap;flex-shrink:0}
.inst-divider{width:1px;height:20px;background:var(--line);flex-shrink:0}
.inst-logos{display:flex;align-items:center;gap:32px;flex-wrap:wrap}
.inst-name{font-size:13px;font-weight:600;color:var(--faint);letter-spacing:.01em;white-space:nowrap;transition:color .2s}
.inst-name:hover{color:var(--muted)}
/* ── TESTIMONIAL BAND ── */
.testimonial-band{background:var(--bg2);border-top:1px solid var(--line);border-bottom:1px solid var(--line);padding:80px 0}
.testimonial-inner{max-width:760px;margin:0 auto;padding:0 48px;text-align:center}
.testimonial-quote{font-size:clamp(20px,2.5vw,28px);font-weight:500;line-height:1.5;letter-spacing:-.02em;color:var(--ink);margin-bottom:32px}
.testimonial-quote::before{content:'\201C'}
.testimonial-quote::after{content:'\201D'}
.testimonial-attr{display:flex;align-items:center;justify-content:center;gap:12px}
.testimonial-line{width:32px;height:1px;background:var(--line)}
.testimonial-name{font-size:13px;font-weight:600;color:var(--muted);letter-spacing:.02em}
/* ── HOW IT WORKS ── */
.how-section{background:var(--bg);padding:120px 0}
.how-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:12px;overflow:hidden;margin-top:60px}
.how-step{background:var(--bg);padding:48px 36px}
.how-num{font-size:11px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--faint);margin-bottom:24px;font-family:var(--mono)}
.how-title{font-size:22px;font-weight:700;letter-spacing:-.02em;color:var(--ink);margin-bottom:12px}
.how-desc{font-size:15px;color:var(--muted);line-height:1.75}
/* ── FAQ SECTION ── */
.faq-section{background:var(--bg2);padding:120px 0;border-top:1px solid var(--line)}
.faq-head{max-width:560px;margin-bottom:60px}
.faq-grid{display:grid;grid-template-columns:1fr 1fr;gap:0 80px}
.faq-item{padding:28px 0;border-bottom:1px solid var(--line)}
.faq-item:last-child{border-bottom:none}
.faq-q{font-size:16px;font-weight:600;letter-spacing:-.01em;color:var(--ink);margin-bottom:10px}
.faq-a{font-size:14px;color:var(--muted);line-height:1.75}
/* ── SPECS BAND ── */
.specs-band{background:var(--ink);padding:72px 0}
.specs-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1px;background:rgba(255,255,255,.06)}
.spec-item{padding:36px 32px;background:var(--ink)}
.spec-val{font-size:28px;font-weight:800;letter-spacing:-.03em;color:#fff;margin-bottom:6px;font-family:var(--mono)}
.spec-key{font-size:12px;font-weight:500;letter-spacing:.08em;text-transform:uppercase;color:rgba(255,255,255,.35)}
/* ── RESPONSIVE ADDITIONS ── */
@media(max-width:768px){
  .inst-strip-inner{padding:0 20px;gap:20px}
  .how-grid{grid-template-columns:1fr}
  .faq-grid{grid-template-columns:1fr}
  .specs-grid{grid-template-columns:1fr 1fr}
  .testimonial-inner{padding:0 20px}
  .how-section,.faq-section{padding:80px 0}
}
@media(max-width:520px){
  .specs-grid{grid-template-columns:1fr}
}

/* ── FEATURE CSS (pipeline, learn, anatomy, roadmap) ── */
.pipeline-diagram{background:#0d0d0f;border-radius:12px;overflow:hidden;padding:40px 32px;margin-bottom:48px;border:1px solid rgba(255,255,255,.06)}
.pipeline-legend{display:grid;grid-template-columns:repeat(5,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.pipe-item{background:var(--bg);padding:20px 18px}
.pipe-item-label{font-size:10px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:6px}
.pipe-item h5{font-size:15px;font-weight:700;color:var(--ink);margin-bottom:6px;letter-spacing:-.01em;margin-top:0}
.pipe-item p{font-size:13px;color:var(--muted);line-height:1.55;margin:0}
.pipe-topic{display:inline-block;font-family:var(--mono);font-size:11px;color:#0057ff;background:rgba(0,87,255,.06);border:1px solid rgba(0,87,255,.1);border-radius:4px;padding:2px 7px;margin-top:8px}
@media(max-width:900px){.pipeline-legend{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.pipeline-legend{grid-template-columns:1fr}}

/* ── LEARN PAGE ── */
.learn-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:12px;overflow:hidden;margin-top:60px}
.learn-area{background:#fff;padding:36px 28px;transition:background .2s}
.learn-area:hover{background:var(--bg2)}
.learn-area-head{display:flex;align-items:baseline;gap:12px;margin-bottom:14px}
.learn-num{font-family:var(--mono);font-size:11px;font-weight:700;color:var(--faint);letter-spacing:.08em}
.learn-area h3{font-size:17px;font-weight:700;letter-spacing:-.01em;color:var(--ink);margin:0}
.learn-area p{font-size:14px;color:var(--muted);line-height:1.75;margin-bottom:16px}
.learn-area-tags{display:flex;flex-wrap:wrap;gap:6px}
@media(max-width:1100px){.learn-grid{grid-template-columns:1fr 1fr}}
@media(max-width:600px){.learn-grid{grid-template-columns:1fr}}

/* ── ANATOMY DIAGRAM ── */
.anatomy-wrap{display:grid;grid-template-columns:380px 1fr;gap:48px;align-items:start}
.anatomy-svg-wrap{background:#0d0d0f;border-radius:12px;padding:32px;border:1px solid rgba(255,255,255,.06)}
.anatomy-panel{background:#fff;border:1px solid var(--line);border-radius:12px;padding:36px;min-height:360px;position:sticky;top:100px}
.anatomy-spot{cursor:pointer;transition:opacity .2s}
.anatomy-spot:hover{opacity:.8}
.anatomy-detail-label{font-size:10px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--muted);margin-bottom:8px}
.anatomy-detail h3{font-size:22px;font-weight:800;letter-spacing:-.02em;color:var(--ink);margin-bottom:14px;margin-top:0}
.anatomy-detail p{font-size:15px;color:var(--muted);line-height:1.75;margin-bottom:20px}
.anatomy-learns-label{font-size:10px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;color:#00804a;margin-bottom:12px}
.anatomy-learns li{font-size:14px;color:var(--soft);padding-left:20px;position:relative;margin-bottom:8px;list-style:none}
.anatomy-learns li::before{content:'→';position:absolute;left:0;color:#00804a;font-size:11px;font-weight:800;top:2px}
@keyframes anat-pulse{0%,100%{r:14;opacity:.5}50%{r:17;opacity:.15}}
@media(max-width:900px){.anatomy-wrap{grid-template-columns:1fr}.anatomy-panel{position:static;min-height:auto}}

/* ── ROADMAP ── */
.roadmap-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.roadmap-col{background:#fff;padding:36px 28px}
.roadmap-col-header{display:flex;align-items:center;gap:8px;margin-bottom:12px}
.roadmap-status-dot{width:8px;height:8px;border-radius:50%;flex-shrink:0}
.roadmap-status-dot.current{background:#00804a;box-shadow:0 0 0 3px rgba(0,128,74,.15)}
.roadmap-status-dot.indev{background:#b35d00;box-shadow:0 0 0 3px rgba(179,93,0,.12)}
.roadmap-status-dot.planned{background:#86868b}
.roadmap-col-label{font-size:10px;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.roadmap-col.roadmap-current .roadmap-col-label{color:#00804a}
.roadmap-col.roadmap-indev .roadmap-col-label{color:#b35d00}
.roadmap-col-title{font-size:16px;font-weight:700;color:var(--ink);margin:0 0 20px;padding-bottom:16px;border-bottom:1px solid var(--line);letter-spacing:-.01em}
.roadmap-items{display:flex;flex-direction:column;gap:10px;list-style:none;padding:0;margin:0}
.roadmap-items li{font-size:14px;color:var(--muted);line-height:1.5;padding-left:18px;position:relative}
.roadmap-col.roadmap-current .roadmap-items li::before{content:'✓';position:absolute;left:0;color:#00804a;font-weight:800;font-size:11px;top:1px}
.roadmap-col.roadmap-indev .roadmap-items li::before{content:'◌';position:absolute;left:0;color:#b35d00;font-size:13px;top:0}
.roadmap-col.roadmap-planned .roadmap-items li::before{content:'○';position:absolute;left:0;color:var(--faint);font-size:13px;top:0}
@media(max-width:860px){.roadmap-grid{grid-template-columns:1fr}}
</style>