/* ══════════════════════════════════════════════════════════════════════
   TaskLab 1C — shared design system
   Единый CSS для всех страниц. Импортирует шрифты, задаёт токены и
   переиспользуемые компоненты. Локальные страничные стили дописываются
   поверх (пример — landing_percept.html, handlers/record.go).
   ══════════════════════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter+Tight:wght@400;500;600;700;800&family=JetBrains+Mono:wght@400;500;600&display=swap');

/* ── Design tokens ─────────────────────────────────────────────────── */
:root{
  --bg:hsl(0 0% 99.2%);
  --surface-soft:hsl(0 0% 96.1%);
  --surface-mute:hsl(0 0% 92.2%);
  --fg:hsl(0 0% 18.8%);
  --fg-strong:hsl(0 0% 5.1%);
  --fg-muted:hsl(0 0% 45.5%);
  --card:#fff;
  --primary:hsl(51 100% 61%);
  --primary-glow:hsl(51 100% 75%);
  --primary-deep:hsl(45 90% 45%);
  --border:hsl(0 0% 89%);
  --border-strong:hsl(0 0% 80%);
  --success:#22c55e;
  --warning:#f59e0b;
  --destructive:hsl(0 70% 50%);
  --info:#3b82f6;

  --radius:14px;
  --radius-sm:8px;
  --radius-md:12px;
  --radius-lg:14px;
  --radius-xl:18px;
  --radius-2xl:22px;

  --shadow-soft:0 1px 2px rgba(0,0,0,.04), 0 8px 24px -12px rgba(0,0,0,.08);
  --shadow-elev:0 2px 4px rgba(0,0,0,.04), 0 24px 48px -20px rgba(0,0,0,.12);
  --shadow-yellow:0 20px 60px -20px rgba(255,214,51,.45);
  --shadow-yellow-sm:0 4px 14px -4px rgba(255,214,51,.55);

  --grad-yellow-glow:radial-gradient(60% 60% at 50% 40%, rgba(255,214,51,.28), transparent 70%);
  --grain:radial-gradient(circle at 1px 1px, rgba(0,0,0,.025) 1px, transparent 0);

  --font-sans:'Inter Tight', ui-sans-serif, system-ui, sans-serif;
  --font-mono:'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, monospace;
}

/* ── Reset ─────────────────────────────────────────────────────────── */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{
  font-family:var(--font-sans);
  background:var(--bg);
  color:var(--fg);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  line-height:1.5;
}
a{color:inherit;text-decoration:none}
img,svg{max-width:100%;display:block}
button{font-family:inherit}
::selection{background:var(--primary);color:var(--fg-strong)}

/* ── Typography ────────────────────────────────────────────────────── */
h1,h2,h3,h4{color:var(--fg-strong);font-weight:600;letter-spacing:-.02em;line-height:1.15}
.h1,h1{font-size:clamp(44px,5.5vw,64px);line-height:1.02;letter-spacing:-.032em}
.h2,h2{font-size:clamp(32px,4vw,44px);line-height:1.02;letter-spacing:-.023em}
.h3,h3{font-size:24px;letter-spacing:-.012em}
.h4,h4{font-size:17px;letter-spacing:-.01em}

.eyebrow{
  font-size:11px;font-weight:600;text-transform:uppercase;
  letter-spacing:.18em;color:var(--fg-muted);
}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}

/* ── Layout ────────────────────────────────────────────────────────── */
.container{max-width:1200px;margin:0 auto;padding:0 24px}
.section{padding:96px 0;position:relative}
@media(min-width:640px){.section{padding:128px 0}}
.section-alt{background:var(--surface-soft)}

.section-lede{display:grid;gap:40px}
@media(min-width:900px){
  .section-lede{grid-template-columns:1fr 1.15fr;gap:64px;align-items:start}
}
.section-lede h2{margin-top:16px}
.lede-body{font-size:17px;line-height:1.62;color:var(--fg-muted)}
.lede-body p+p{margin-top:16px}
.lede-body strong{color:var(--fg-strong);font-weight:500}

/* ── Brand mark ────────────────────────────────────────────────────── */
.brand{display:inline-flex;align-items:center;gap:10px}
.brand-mark{
  width:28px;height:28px;display:inline-flex;align-items:center;justify-content:center;
  filter:drop-shadow(0 4px 12px rgba(255,214,51,.45));
}
.brand-mark svg{display:block}
.brand-name{font-weight:600;font-size:16px;letter-spacing:-.02em;color:var(--fg-strong)}
.brand-name em{font-style:normal;color:var(--fg-strong);opacity:.55;font-weight:500}

/* ── Pill buttons ──────────────────────────────────────────────────── */
.pill{
  display:inline-flex;align-items:center;justify-content:center;
  height:40px;padding:0 20px;border-radius:9999px;
  font-size:14px;font-weight:500;transition:all .15s;cursor:pointer;
  border:none;font-family:inherit;white-space:nowrap;gap:6px;
}
.pill:disabled{opacity:.45;cursor:not-allowed}
.pill-primary{background:var(--primary);color:var(--fg-strong);box-shadow:var(--shadow-yellow-sm)}
.pill-primary:hover:not(:disabled){background:hsl(51 100% 55%);box-shadow:var(--shadow-yellow)}
.pill-outline{color:var(--fg-strong);background:transparent;border:1px solid var(--border-strong)}
.pill-outline:hover:not(:disabled){border-color:var(--fg-strong)}
.pill-ghost{color:var(--fg-strong);background:transparent}
.pill-ghost:hover:not(:disabled){background:var(--surface-soft)}
.pill-dark{background:var(--fg-strong);color:#fff}
.pill-dark:hover:not(:disabled){background:#000}
.pill-danger{background:var(--destructive);color:#fff}
.pill-danger:hover:not(:disabled){background:hsl(0 70% 45%)}

.pill-sm{height:32px;padding:0 14px;font-size:13px}
.pill-lg{height:44px;padding:0 24px;font-size:15px}
.pill-xl{height:52px;padding:0 32px;font-size:16px}

/* ── Cards ─────────────────────────────────────────────────────────── */
.card{
  background:var(--card);border:1px solid var(--border);
  border-radius:var(--radius-xl);padding:28px;box-shadow:var(--shadow-soft);
}
.card-hover{transition:box-shadow .2s,transform .2s,border-color .2s}
.card-hover:hover{box-shadow:var(--shadow-elev);transform:translateY(-2px)}
.card-dark{background:var(--fg-strong);color:#fff;border-color:var(--fg-strong)}
.card-dark h3,.card-dark h4{color:#fff}

/* ── Text links with animated underline ────────────────────────────── */
.link-arrow{
  display:inline-flex;align-items:center;gap:6px;
  font-size:14px;font-weight:500;color:var(--fg-strong);
  transition:color .15s;
}
.link-arrow:hover{color:var(--fg)}
.link-arrow svg{width:14px;height:14px}

.link-underline{
  color:var(--fg-strong);font-weight:500;text-decoration:underline;
  text-decoration-color:transparent;text-decoration-thickness:2px;
  text-underline-offset:4px;transition:text-decoration-color .2s;
}
.link-underline:hover{text-decoration-color:var(--fg-strong)}

/* ── Badges / chips ────────────────────────────────────────────────── */
.badge{
  display:inline-flex;align-items:center;gap:4px;
  padding:3px 10px;border-radius:9999px;
  font-size:11px;font-weight:600;letter-spacing:.06em;
  text-transform:uppercase;
}
.badge-yellow{background:var(--primary);color:var(--fg-strong)}
.badge-dark{background:var(--fg-strong);color:#fff}
.badge-mute{background:var(--surface-mute);color:var(--fg-muted)}
.badge-success{background:rgba(34,197,94,.12);color:#166534}
.badge-warning{background:rgba(245,158,11,.14);color:#a16207}
.badge-danger{background:rgba(220,38,38,.10);color:#b91c1c}
.badge-dot{width:6px;height:6px;border-radius:50%;background:currentColor;flex-shrink:0}

/* ── Form controls (базовые) ───────────────────────────────────────── */
.input,.select,.textarea{
  font-family:inherit;font-size:14px;color:var(--fg-strong);
  background:var(--card);border:1px solid var(--border-strong);
  border-radius:var(--radius-sm);padding:10px 14px;
  transition:border-color .15s, box-shadow .15s;width:100%;
}
.input:focus,.select:focus,.textarea:focus{
  outline:none;border-color:var(--fg-strong);
  box-shadow:0 0 0 3px rgba(255,214,51,.25);
}
.input::placeholder,.textarea::placeholder{color:var(--fg-muted)}
.label{
  display:block;font-size:12px;font-weight:600;color:var(--fg-strong);
  letter-spacing:.02em;margin-bottom:6px;
}

/* ── Utility ───────────────────────────────────────────────────────── */
.hero-glow{position:absolute;inset:0 0 auto 0;height:720px;background:var(--grad-yellow-glow);z-index:-1;pointer-events:none}
.grain{position:absolute;inset:0;background-image:var(--grain);background-size:3px 3px;opacity:.6;z-index:-1;pointer-events:none}
.divider{height:1px;background:var(--border);border:0}
.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}

/* ── Reveal on scroll ──────────────────────────────────────────────── */
.reveal{opacity:0;transform:translateY(24px);transition:opacity .7s ease-out,transform .7s ease-out;will-change:opacity,transform}
.reveal.in{opacity:1;transform:translateY(0)}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}

/* ── Scrollbar (тонкий) ────────────────────────────────────────────── */
.thin-scroll::-webkit-scrollbar{width:6px;height:6px}
.thin-scroll::-webkit-scrollbar-track{background:transparent}
.thin-scroll::-webkit-scrollbar-thumb{background:var(--border-strong);border-radius:6px}
.thin-scroll::-webkit-scrollbar-thumb:hover{background:var(--fg-muted)}