/* ============================================================
   coldstart — home · notebook-first, destination nav (nextjs-style IA)
   temperature = concept: frost = the cold exact index, ember = the warm memory.
   ============================================================ */
:root{
  --void:#070a11;
  --ink-1:#0b111c;
  --ink-2:#0f1826;
  --raised:#121d2d;
  --warm-ground:#12100e;
  --text:#e7eef8;
  --muted:#8b9ab2;
  --faint:#5d6b83;
  --frost:#4fbfe0;
  --frost-dim:#2f89a8;
  --ember:#ef9448;
  --ember-dim:#b96a28;
  --ok:#57cc92;
  --line:#1a2536;
  --line-warm:#2a2218;
  --mono:"SF Mono",ui-monospace,"JetBrains Mono","Fira Code",Menlo,Consolas,monospace;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;
  --wrap:1120px;
}
*{box-sizing:border-box;}
body{
  margin:0;background:var(--void);color:var(--text);
  font-family:var(--sans);line-height:1.6;-webkit-font-smoothing:antialiased;
  font-feature-settings:"kern" 1;overflow-x:hidden;
}
a{color:inherit;text-decoration:none;}
h1,h2,h3,h4{margin:0;text-wrap:balance;}
p{margin:0;}
code{font-family:var(--mono);}
.wrap{max-width:var(--wrap);margin:0 auto;padding:0 28px;}

/* scroll progress: a hairline that warms frost→ember as you descend */
.progress{position:fixed;top:0;left:0;height:2px;width:0;z-index:60;
  background:linear-gradient(90deg,var(--frost),var(--ember));
  box-shadow:0 0 12px rgba(239,148,72,.4);transition:width .08s linear;}

/* ---------- NAV ---------- */
nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(12px);
  background:color-mix(in srgb,var(--void) 78%,transparent);
  border-bottom:1px solid var(--line);}
.nav-in{max-width:var(--wrap);margin:0 auto;padding:0 28px;height:62px;
  display:flex;align-items:center;gap:22px;}
.brand{font-family:var(--mono);font-weight:700;font-size:17px;letter-spacing:-.02em;
  display:flex;align-items:center;gap:10px;color:var(--text);}
.brand .dot{width:11px;height:11px;border-radius:50%;
  background:radial-gradient(circle at 34% 30%,var(--ember),var(--frost));
  box-shadow:0 0 12px color-mix(in srgb,var(--frost) 60%,transparent);}
.brand .mark{flex:none;}
.mark{fill:none;}
.fl{stroke-width:2.1;stroke-linecap:round;}
.s2 .fl{stroke:url(#warm);}
.core{stroke:none;}
.nav-sp{flex:1;}
.nav-links{display:flex;gap:24px;font-family:var(--mono);font-size:13.5px;}
.nav-links a{color:var(--muted);transition:color .15s;}
.nav-links a:hover{color:var(--text);}
.nav-cta{font-family:var(--mono);font-size:13px;padding:8px 16px;border-radius:8px;
  border:1px solid var(--line);color:var(--text);transition:.15s;}
.nav-cta:hover{border-color:var(--frost);background:color-mix(in srgb,var(--frost) 12%,transparent);}
@media(max-width:820px){.nav-links{display:none;}}

/* ---------- shared section scaffold ---------- */
section{padding:104px 0;position:relative;}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.18em;text-transform:uppercase;
  color:var(--frost);margin-bottom:22px;}
.eyebrow.warm{color:var(--ember);}
h2{font-family:var(--mono);font-weight:700;font-size:clamp(27px,4vw,40px);
  letter-spacing:-.035em;line-height:1.08;}
.lead{margin-top:20px;font-size:clamp(16px,2vw,19px);color:var(--muted);max-width:60ch;}
.lead b,.lead strong{color:var(--text);font-weight:600;}

/* reveal on scroll */
.rise{opacity:0;transform:translateY(22px);transition:opacity .7s ease,transform .7s ease;}
.rise.in{opacity:1;transform:none;}

/* ---------- HERO ---------- */
.hero{padding:88px 0 96px;position:relative;overflow:hidden;}
.hero::before{content:"";position:absolute;inset:0;z-index:-1;
  background:
    radial-gradient(80% 60% at 78% -10%,color-mix(in srgb,var(--frost) 15%,transparent),transparent 60%),
    radial-gradient(60% 50% at 0% 8%,color-mix(in srgb,var(--frost) 8%,transparent),transparent 55%);}
.hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:56px;align-items:center;}
@media(max-width:940px){.hero-grid{grid-template-columns:1fr;gap:40px;}}
h1.title{font-family:var(--mono);font-weight:700;
  font-size:clamp(32px,5.2vw,54px);line-height:1.05;letter-spacing:-.04em;max-width:16ch;}
h1.title .cold{color:var(--frost);}
h1.title .warm{color:var(--ember);}
.hero-sub{margin-top:26px;font-size:clamp(16px,2vw,19px);color:var(--muted);max-width:52ch;}
.hero-sub b{color:var(--text);font-weight:600;}
.cta{margin-top:34px;display:flex;gap:14px;align-items:center;flex-wrap:wrap;}
.btn{font-family:var(--mono);font-size:14px;padding:12px 22px;border-radius:9px;
  display:inline-flex;align-items:center;gap:9px;transition:transform .12s,box-shadow .25s,border-color .15s,background .2s;}
.btn-primary{background:var(--frost);color:#04121a;font-weight:600;}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 12px 30px -8px color-mix(in srgb,var(--frost) 55%,transparent);}
.btn-ghost{color:var(--text);border:1px solid var(--line);}
.btn-ghost:hover{border-color:var(--frost);}
.hero-note{font-family:var(--mono);font-size:12px;color:var(--faint);}

/* ---------- TERMINAL ---------- */
.term{background:#05080e;border:1px solid var(--line);border-radius:13px;overflow:hidden;
  box-shadow:0 40px 90px -40px rgba(0,0,0,.9),0 0 0 1px rgba(255,255,255,.02) inset;}
.term-bar{display:flex;align-items:center;gap:8px;padding:12px 15px;
  border-bottom:1px solid rgba(255,255,255,.05);background:rgba(255,255,255,.015);}
.tl{width:11px;height:11px;border-radius:50%;}
.tl:nth-child(1){background:#ff5f57;}.tl:nth-child(2){background:#febc2e;}.tl:nth-child(3){background:#28c840;}
.term-title{margin-left:10px;font-family:var(--mono);font-size:11.5px;color:#5d6b83;}
.copy-btn{margin-left:auto;font-family:var(--mono);font-size:11px;color:#8aa0bd;cursor:pointer;
  background:rgba(255,255,255,.04);border:1px solid rgba(255,255,255,.08);border-radius:6px;
  padding:4px 10px;transition:color .15s,background .15s,border-color .15s;}
.copy-btn:hover{color:#eef3fb;background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.16);}
.copy-btn.copied{color:#4fd18b;border-color:rgba(79,209,139,.4);background:rgba(79,209,139,.08);}
.term-body{padding:20px 22px 24px;font-family:var(--mono);font-size:13px;line-height:1.85;
  color:#c3d0e2;overflow-x:auto;}
.term-body .l{white-space:pre;display:block;}
.p-prompt{color:#4fd18b;}.p-cmd{color:#eef3fb;}.p-flag{color:var(--ember);}
.p-dim{color:#5d6b83;}.p-frost{color:#6fd3ef;}.p-ember{color:#ffb267;}
.p-hit{color:#4fd18b;}.p-file{color:#c3d0e2;}
.term-body .gap{display:block;height:9px;}
/* typing reveal */
.type .l{opacity:0;animation:lineIn .28s ease forwards;}
@keyframes lineIn{to{opacity:1;}}
.cursor{display:inline-block;width:8px;height:15px;vertical-align:-2px;margin-left:2px;
  background:var(--frost);animation:blink 1.05s steps(1) infinite;}
@keyframes blink{50%{opacity:0;}}

/* ---------- NAVIGATION SECTION (the index) ---------- */
.navsec{background:var(--ink-1);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.ops{display:grid;grid-template-columns:1fr 1fr;gap:22px;margin-top:44px;}
@media(max-width:800px){.ops{grid-template-columns:1fr;}}
.op{border:1px solid var(--line);border-radius:13px;background:var(--void);padding:30px;position:relative;overflow:hidden;}
.op::before{content:"";position:absolute;top:0;left:0;right:0;height:2px;background:var(--frost);opacity:.7;}
.op .on{font-family:var(--mono);font-weight:700;font-size:20px;color:var(--frost);}
.op .on .sig{color:var(--faint);font-weight:400;font-size:14px;}
.op h3{font-family:var(--mono);font-size:16px;margin:14px 0 8px;letter-spacing:-.01em;color:var(--text);}
.op p{color:var(--muted);font-size:14.5px;}
.op p em{color:var(--text);font-style:normal;border-bottom:1px solid var(--frost-dim);}
.flow{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;align-items:stretch;margin-top:22px;}
@media(max-width:800px){.flow{grid-template-columns:1fr;gap:14px;}.flow .arrow{display:none;}}
.step{border:1px solid var(--line);border-radius:12px;background:var(--void);padding:22px;}
.step .k{font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--faint);}
.step .cmd{font-family:var(--mono);font-weight:700;font-size:17px;margin-top:10px;letter-spacing:-.02em;}
.step.cold .cmd{color:var(--frost);}.step.warm .cmd{color:var(--ember);}
.step .cap{color:var(--muted);font-size:13.5px;margin-top:9px;}
.arrow{display:grid;place-items:center;font-family:var(--mono);color:var(--faint);font-size:20px;padding:0 18px;}
.tax-note{margin-top:24px;font-family:var(--mono);font-size:13px;color:var(--muted);}
.tax-note b{color:var(--frost);font-weight:600;}

/* ---------- NOTEBOOK (the lead value, warm) ---------- */
.nb{background:
    radial-gradient(90% 70% at 82% -5%,color-mix(in srgb,var(--ember) 13%,transparent),transparent 58%),
    radial-gradient(70% 60% at 0% 100%,color-mix(in srgb,var(--ember) 8%,transparent),transparent 55%),
    var(--warm-ground);
  border-top:1px solid var(--line-warm);border-bottom:1px solid var(--line-warm);}
.nb h2 .warm{color:var(--ember);}
.beats{display:flex;flex-direction:column;gap:78px;margin-top:60px;}
.beat{display:grid;grid-template-columns:.92fr 1.08fr;gap:54px;align-items:center;}
.beat.rev .bv{order:-1;}
@media(max-width:860px){.beat{grid-template-columns:1fr;gap:28px;}.beat.rev .bv{order:0;}}
.bstep{font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--ember);display:flex;align-items:center;gap:12px;}
.bstep .n{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;font-size:12px;flex:none;
  border:1px solid color-mix(in srgb,var(--ember) 50%,var(--line-warm));color:var(--ember);}
.beat h3{font-family:var(--mono);font-size:clamp(20px,2.6vw,25px);letter-spacing:-.025em;margin:18px 0 12px;}
.bt p{color:var(--muted);font-size:15px;}
.bt p+p{margin-top:11px;}
.bt code{font-family:var(--mono);font-size:12.5px;background:rgba(239,148,72,.1);
  border:1px solid var(--line-warm);border-radius:6px;padding:1px 7px;color:var(--ember);}
.lbl{font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--faint);}

/* note card */
.card{border:1px solid var(--line-warm);border-radius:13px;background:#0e0c09;overflow:hidden;
  box-shadow:0 30px 70px -40px rgba(0,0,0,.9);}
.card-top{padding:17px 20px 15px;border-bottom:1px solid var(--line-warm);}
.kick{display:flex;align-items:center;gap:9px;flex-wrap:wrap;}
.pill-t{font-family:var(--mono);font-size:10.5px;letter-spacing:.08em;text-transform:uppercase;
  padding:3px 9px;border-radius:999px;border:1px solid color-mix(in srgb,var(--ember) 45%,var(--line-warm));color:var(--ember);}
.pill{font-family:var(--mono);font-size:10.5px;padding:3px 9px 3px 8px;border-radius:999px;
  display:inline-flex;align-items:center;gap:6px;font-weight:600;}
.pill .d{width:7px;height:7px;border-radius:50%;}
.pill.fresh{background:rgba(87,204,146,.14);color:var(--ok);}.pill.fresh .d{background:var(--ok);}
.pill.chg{background:rgba(239,148,72,.14);color:var(--ember);}.pill.chg .d{background:var(--ember);}
.card-title{font-family:var(--mono);font-size:16px;font-weight:700;letter-spacing:-.02em;margin-top:12px;color:var(--text);}
.card-body{padding:16px 20px 20px;}
.card-body p{font-size:13.5px;color:#cdd8e8;}
.card-body p+p{margin-top:9px;}
.mono-link{color:var(--frost);font-family:var(--mono);font-size:13px;}
.warnbar{margin-top:11px;font-family:var(--mono);font-size:11.5px;color:var(--ember);
  background:rgba(239,148,72,.1);border-radius:8px;padding:9px 11px;}
.anchors{margin-top:15px;border-top:1px solid var(--line-warm);padding-top:13px;}
.anchors .lbl{margin-bottom:9px;}
.arow{display:flex;flex-wrap:wrap;gap:8px;}
.anc{font-family:var(--mono);font-size:11.5px;padding:4px 9px;border:1px solid var(--line-warm);
  border-radius:7px;background:rgba(255,255,255,.02);color:#cdd8e8;display:inline-flex;align-items:center;gap:7px;}
.anc .d{width:6px;height:6px;border-radius:50%;}
.anc.fresh .d{background:var(--ok);}.anc.chg .d{background:var(--ember);}
.anc .sym{color:var(--faint);}

/* kb view mock */
.viewer{border:1px solid var(--line-warm);border-radius:13px;background:#0e0c09;overflow:hidden;
  box-shadow:0 30px 70px -40px rgba(0,0,0,.9);}
.vchrome{display:flex;align-items:center;gap:8px;padding:10px 14px;background:rgba(255,255,255,.02);border-bottom:1px solid var(--line-warm);}
.vchrome .tl{width:10px;height:10px;}
.vurl{margin-left:8px;font-family:var(--mono);font-size:11px;color:var(--faint);
  background:rgba(0,0,0,.4);border:1px solid var(--line-warm);border-radius:6px;padding:3px 10px;flex:1;}
.vapp{display:grid;grid-template-columns:200px 1fr;min-height:300px;}
@media(max-width:520px){.vapp{grid-template-columns:1fr;}.vtree{display:none;}}
.vtop{grid-column:1/-1;display:flex;align-items:center;gap:12px;padding:12px 16px;border-bottom:1px solid var(--line-warm);}
.vrepo{font-family:var(--mono);font-weight:700;font-size:14px;}
.vk{font-family:var(--mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:var(--faint);}
.vcount{margin-left:auto;font-family:var(--mono);font-size:11px;color:var(--faint);}
.vtree{border-right:1px solid var(--line-warm);padding:10px 8px;font-family:var(--mono);font-size:12px;background:rgba(0,0,0,.25);}
.vr{display:flex;align-items:center;gap:7px;padding:4px 8px;border-radius:6px;color:#cdd8e8;white-space:nowrap;}
.vr .tw{color:var(--faint);width:10px;display:inline-block;}
.vr.dir{color:var(--faint);}
.vr.on{background:rgba(79,191,224,.1);}
.vr .dd{width:6px;height:6px;border-radius:50%;margin-left:auto;}
.vr .dd.fresh{background:var(--ok);}.vr .dd.chg{background:var(--ember);}
.i1{padding-left:16px;}.i2{padding-left:30px;}
.vpane{padding:18px 20px;}
.vpane p{font-size:13px;color:#cdd8e8;margin-top:10px;}

/* keynote */
.keynote{margin-top:64px;border:1px solid color-mix(in srgb,var(--ember) 40%,var(--line-warm));
  background:color-mix(in srgb,var(--ember) 7%,var(--warm-ground));border-radius:13px;
  padding:24px 28px;display:flex;gap:24px;align-items:baseline;}
.keynote .kk{font-family:var(--mono);font-size:11.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--ember);white-space:nowrap;flex:none;}
.keynote p{font-size:15px;color:var(--text);line-height:1.65;}
.keynote b{font-weight:600;}
.keynote code{font-family:var(--mono);font-size:13px;background:rgba(0,0,0,.35);border:1px solid var(--line-warm);border-radius:6px;padding:2px 7px;color:var(--ember);}
@media(max-width:640px){.keynote{flex-direction:column;gap:10px;}}
.nb-foot{margin-top:40px;max-width:64ch;margin-inline:auto;text-align:center;}
.nb-foot .big{font-family:var(--mono);font-size:clamp(17px,2.2vw,21px);letter-spacing:-.02em;line-height:1.4;color:var(--text);}
.nb-foot .sm{margin-top:13px;font-size:14.5px;color:var(--muted);}
.nb-foot b{color:var(--ember);font-weight:600;}

/* ---------- PHILOSOPHY / why it works ---------- */
.phil{background:var(--ink-1);border-top:1px solid var(--line);border-bottom:1px solid var(--line);}
.cmp{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin-top:44px;}
@media(max-width:760px){.cmp{grid-template-columns:1fr;}}
.col{border:1px solid var(--line);border-radius:13px;background:var(--void);padding:26px;}
.col.them{opacity:.72;}
.col h4{font-family:var(--mono);font-size:14px;margin:0 0 16px;letter-spacing:.02em;}
.col.them h4{color:var(--muted);}.col.us h4{color:var(--frost);}
.col ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:13px;}
.col li{display:flex;gap:11px;font-size:14px;color:var(--muted);}
.col li b{color:var(--text);font-weight:600;}
.mk{font-family:var(--mono);flex:none;}
.them .mk{color:#c46a60;}.us .mk{color:var(--ok);}
.keynote.cool{border-color:color-mix(in srgb,var(--frost) 40%,var(--line));
  background:color-mix(in srgb,var(--frost) 6%,var(--ink-1));}
.keynote.cool .kk{color:var(--frost);}
.keynote.cool code{color:var(--frost);}

/* ---------- LANGUAGES ---------- */
.langs{display:flex;flex-wrap:wrap;gap:9px;margin-top:40px;}
.chip{font-family:var(--mono);font-size:12.5px;padding:5px 12px;border:1px solid var(--line);
  border-radius:999px;color:var(--muted);background:var(--ink-1);}
.chip.hot{color:var(--frost);border-color:color-mix(in srgb,var(--frost) 40%,var(--line));}

/* ---------- INSTALL ---------- */
.install-term{max-width:760px;margin-top:44px;}
.install .cta{justify-content:flex-start;margin-top:30px;}

/* ---------- FOOTER ---------- */
footer{border-top:1px solid var(--line);padding:50px 0;}
.foot-in{max-width:var(--wrap);margin:0 auto;padding:0 28px;display:flex;justify-content:space-between;
  gap:24px;flex-wrap:wrap;align-items:center;}
.foot-brand{font-family:var(--mono);color:var(--faint);font-size:13px;}
.foot-links{display:flex;gap:22px;font-family:var(--mono);font-size:13px;}
.foot-links a{color:var(--muted);}.foot-links a:hover{color:var(--text);}

@media(prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;}
  .type .l{opacity:1!important;}.rise{opacity:1!important;transform:none!important;}
  .cursor{display:none;}
}
:focus-visible{outline:2px solid var(--frost);outline-offset:2px;border-radius:4px;}