/* Pulsebox – etusivu ja osaluettelo */
:root {
  --bg:#0a0e14; --panel:#131923; --panel2:#1a2230; --border:#242e3d; --text:#e8eef5; --muted:#92a0b2;
  --accent:#4cc9f0; --accent2:#2bb673; --ink:#04202a; --silk:#6b7c8f; --mono:ui-monospace,"Cascadia Code",Consolas,monospace;
  color-scheme:dark;
}
* { box-sizing:border-box; }
html { scroll-behavior:smooth; }
body {
  margin:0; color:var(--text); font:16px/1.55 Inter,system-ui,-apple-system,"Segoe UI",sans-serif;
  background:
    radial-gradient(900px 480px at 78% -60px, rgba(43,182,115,.17), transparent 70%),
    radial-gradient(760px 420px at 8% 0, rgba(76,201,240,.13), transparent 70%),
    var(--bg);
  background-repeat:no-repeat;
  overflow-x:clip;
}
a { color:inherit; text-decoration:none; }
h1, h2, h3 { line-height:1.15; letter-spacing:-.02em; margin:0; }
main, .nav, .foot { width:min(1160px, 100% - 40px); margin-inline:auto; }

/* Yläpalkki */
.nav { display:flex; align-items:center; gap:28px; padding:18px 0; }
.brand { display:flex; align-items:center; gap:10px; font-weight:700; font-size:18px; }
.logo { width:30px; height:30px; border-radius:9px; background:linear-gradient(135deg,var(--accent),var(--accent2)); display:grid; place-items:center; font-size:16px; color:#fff; }
.links { display:flex; gap:22px; margin-left:auto; color:var(--muted); font-size:15px; }
.links a:hover, .links a.here { color:var(--text); }
select { font:inherit; font-size:14px; color:var(--text); background:var(--panel); border:1px solid var(--border); border-radius:8px; padding:6px 8px; }

/* Hero */
.hero::before {
  content:""; position:absolute; z-index:-1; pointer-events:none; inset:-90px calc(50% - 50vw) -20px; opacity:.55;
  background:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='320' height='320' fill='none' stroke='%232bb673' stroke-opacity='.22' stroke-width='2'%3E%3Cpath d='M0 60H90L130 100H210L250 60H320M0 180H50L90 220V320M320 200H270L230 240V320M150 0V60L180 90M60 320V270L20 230H0'/%3E%3Cg fill='%230a0e14'%3E%3Ccircle cx='90' cy='60' r='5'/%3E%3Ccircle cx='210' cy='100' r='5'/%3E%3Ccircle cx='180' cy='90' r='5'/%3E%3Ccircle cx='50' cy='180' r='5'/%3E%3Ccircle cx='270' cy='200' r='5'/%3E%3C/g%3E%3C/svg%3E");
  -webkit-mask-image:linear-gradient(#000 40%, transparent); mask-image:linear-gradient(#000 40%, transparent);
}
.hero { position:relative; display:grid; grid-template-columns:minmax(0,1fr) minmax(0,1.06fr); gap:52px; align-items:center; padding:56px 0 76px; }
.tag { color:var(--accent); font:600 13.5px var(--mono); margin:0 0 14px; }
h1 { font-size:clamp(38px, 5.2vw, 62px); font-weight:750; }
.lead { color:var(--muted); font-size:18px; margin:20px 0 0; max-width:34em; }
.cta { display:flex; flex-wrap:wrap; gap:12px; margin-top:30px; }
.button { padding:12px 22px; border-radius:10px; font-weight:600; background:var(--panel2); border:1px solid var(--border); transition:transform .12s, border-color .12s, background .12s; }
.button:hover { transform:translateY(-1px); border-color:#3b4b62; }
.button.primary { background:var(--accent); border-color:var(--accent); color:var(--ink); }
.button.primary:hover { background:#6bd5f5; border-color:#6bd5f5; }
.stats { display:flex; gap:38px; margin:38px 0 0; }
.stats dt { font:700 30px var(--mono); letter-spacing:-.03em; }
.stats dd { margin:0; color:var(--muted); font-size:14px; }

.demo { margin:0; background:var(--panel); border:1px solid var(--border); border-radius:18px; overflow:hidden; box-shadow:0 30px 80px rgba(0,0,0,.45); }
.demo figcaption { display:flex; align-items:center; gap:9px; padding:12px 16px; font-size:13.5px; color:var(--muted); border-bottom:1px solid var(--border); }
.demo figcaption a { margin-left:auto; color:var(--accent); font-weight:600; }
.dot { width:8px; height:8px; border-radius:50%; background:#4ade80; box-shadow:0 0 0 4px rgba(74,222,128,.16); }
.demo svg { display:block; width:100%; height:auto; aspect-ratio:3/2; padding:12px; background-image:radial-gradient(#242e3d 1px, transparent 1.2px); background-size:22px 22px; }

/* Osiot */
main > section:not(.hero):not(.pagehead) { padding:0 0 64px; }
h2 { font-size:27px; font-weight:700; }
.head { display:flex; justify-content:space-between; align-items:baseline; gap:16px; }
.head a { color:var(--accent); font-weight:600; font-size:15px; white-space:nowrap; }

.cards { display:grid; grid-template-columns:repeat(auto-fit, minmax(200px,1fr)); gap:14px; margin-top:22px; }
.card::after { content:attr(data-ref); position:absolute; top:16px; right:18px; font:12px var(--mono); color:var(--silk); }
.card { position:relative; display:block; padding:22px; background:var(--panel); border:1px solid var(--border); border-radius:14px; transition:transform .14s, border-color .14s; }
.card:hover { transform:translateY(-3px); border-color:var(--accent); }
.pico { display:inline-grid; place-items:center; width:58px; height:44px; border-radius:11px; background:var(--panel2); color:var(--accent); }
.card h3 { font-size:18px; margin-top:16px; }
.card p { color:var(--muted); font-size:14.5px; margin:8px 0 0; }

.minis { display:grid; grid-template-columns:repeat(3, minmax(0,1fr)); gap:12px; margin-top:20px; }
.mini { display:block; padding:16px 18px; background:var(--panel); border:1px solid var(--border); border-radius:12px; transition:border-color .14s; }
.mini:hover { border-color:var(--accent); }
.mini b { font-weight:600; }
.mini span { display:block; color:var(--muted); font-size:14px; margin-top:4px; }

.tasks { display:flex; flex-wrap:wrap; gap:8px; margin-top:20px; }
.tasks a { padding:8px 14px; font-size:14.5px; background:var(--panel); border:1px solid var(--border); border-radius:999px; color:#c6d2df; transition:border-color .14s, color .14s; }
.tasks a:hover { border-color:var(--accent); color:var(--text); }

.foot { display:flex; justify-content:space-between; gap:24px; padding:24px 0 40px; border-top:1px solid var(--border); color:var(--muted); font-size:14px; }
.foot p { margin:0; }
.foot a { white-space:nowrap; text-decoration:underline; text-underline-offset:3px; }

/* Osaluettelo */
.pagehead { padding:40px 0 34px; }
.pagehead h1 { font-size:clamp(34px, 4.4vw, 48px); }
#search { display:block; width:min(420px, 100%); margin-top:24px; padding:11px 14px; font:inherit; color:var(--text); background:var(--panel); border:1px solid var(--border); border-radius:10px; }
#search:focus { outline:none; border-color:var(--accent); }
#list section { padding-bottom:44px; }
.parts { display:grid; grid-template-columns:repeat(3, minmax(0,1fr)); gap:14px; margin-top:18px; }
.part { padding:20px; background:var(--panel); border:1px solid var(--border); border-radius:14px; }
.part header { display:flex; align-items:center; gap:14px; margin-bottom:12px; }
.part h3 { font-size:18px; }
.part h4 { margin:12px 0 2px; font-size:12px; font-weight:600; text-transform:uppercase; letter-spacing:.7px; color:var(--muted); }
.part p { margin:0; font-size:14.5px; color:#cdd7e2; }

/* Opi-sivu */
.learn { display:grid; grid-template-columns:250px minmax(0,1fr); gap:40px; align-items:start; padding-bottom:60px; }
.toc { position:sticky; top:16px; max-height:calc(100vh - 32px); overflow-y:auto; font-size:14.5px; }
.toc h2 { font-size:13px; font-family:var(--mono); color:var(--accent); font-weight:600; margin:18px 0 8px; letter-spacing:0; }
.toc h2:first-child { margin-top:0; }
.toc a { display:block; padding:4px 0; color:var(--muted); }
.toc a:hover { color:var(--text); }
.grouph { font-size:27px; margin:0 0 18px; }
#lessons section { margin-bottom:44px; }
.lesson { padding:22px 24px; margin-bottom:14px; background:var(--panel); border:1px solid var(--border); border-radius:14px; scroll-margin-top:16px; }
.lesson h3 { font-size:20px; margin-bottom:10px; }
.lesson p { margin:8px 0; color:#cdd7e2; }
.lesson pre { margin:14px 0 4px; padding:14px 16px; overflow-x:auto; background:#0a0e14; border:1px solid var(--border); border-radius:10px; font:13.5px/1.55 var(--mono); color:#9fe6b0; }
.lesson .links { display:flex; flex-wrap:wrap; gap:8px; margin-top:14px; }
.button.small { padding:7px 12px; font-size:13.5px; font-weight:500; color:var(--accent); }

:focus-visible { outline:2px solid var(--accent); outline-offset:2px; }

@media (max-width: 960px) {
  .hero { grid-template-columns:minmax(0,1fr); gap:36px; padding:32px 0 56px; }
  .minis, .parts { grid-template-columns:repeat(2, minmax(0,1fr)); }
  .learn { grid-template-columns:200px minmax(0,1fr); gap:24px; }
}
@media (max-width: 600px) {
  .nav { flex-wrap:wrap; gap:12px 18px; }
  .links { order:3; margin-left:0; width:100%; gap:18px; }
  .nav select { margin-left:auto; }
  .cards, .minis, .parts, .learn { grid-template-columns:minmax(0,1fr); }
  .toc { position:static; max-height:none; }
  .stats { gap:16px; }
  .stats dd { font-size:13px; }
  .foot { flex-direction:column; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior:auto; }
  * { transition:none !important; }
}