/* TensorSketch — shared design system
   Brand palette lifted from the visualizer so the whole platform feels like one thing:
   violet #7e88ff (weights) and green #5bd99a (activations), on a near-black canvas. */

:root {
  --bg: #0b0d13;
  --bg-elev: #12141d;
  --bg-elev-2: #171a25;
  --border: #242838;
  --border-soft: #1b1f2c;
  --fg: #e9ebf2;
  --muted: #9aa2b8;
  --faint: #6b7288;
  --violet: #7e88ff;
  --violet-2: #a08bff;
  --violet-ink: #b7bcff;
  --green: #5bd99a;
  --green-ink: #8ff0c0;
  --radius: 14px;
  --radius-sm: 10px;
  --maxw: 1120px;
  --sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  /* faint dot-grid — a nod to the canvas */
  background-image: radial-gradient(rgba(126, 136, 255, 0.05) 1px, transparent 1px);
  background-size: 26px 26px;
  background-position: -13px -13px;
  min-height: 100vh;
}

a { color: var(--violet-ink); text-decoration: none; }
a:hover { color: #d6d9ff; }

h1, h2, h3 { line-height: 1.15; letter-spacing: -0.02em; font-weight: 700; margin: 0; }
p { margin: 0 0 1rem; }

.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 22px; }

.muted { color: var(--muted); }
.faint { color: var(--faint); }
.accent { color: var(--violet-ink); }
.accent-green { color: var(--green-ink); }
.center { text-align: center; }
.nowrap { white-space: nowrap; }

/* ---------- top nav ---------- */

.topbar {
  position: sticky; top: 0; z-index: 50;
  background: rgba(11, 13, 19, 0.72);
  backdrop-filter: saturate(140%) blur(12px);
  border-bottom: 1px solid var(--border-soft);
}
.nav {
  display: flex; align-items: center; gap: 18px;
  height: 62px; max-width: var(--maxw); margin: 0 auto; padding: 0 22px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 18px; color: var(--fg); letter-spacing: -0.02em; }
.brand:hover { color: var(--fg); }
.brand img { width: 26px; height: 26px; display: block; }
.brand .tld { color: var(--faint); font-weight: 600; }
.nav-links { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.nav-links a {
  color: var(--muted); font-size: 14.5px; font-weight: 500;
  padding: 8px 12px; border-radius: 8px; transition: color .15s, background .15s;
}
.nav-links a:hover { color: var(--fg); background: var(--bg-elev); }
.nav-links a.active { color: var(--fg); }
.nav-gh {
  display: inline-flex; align-items: center; gap: 7px;
  border: 1px solid var(--border); border-radius: 8px; padding: 7px 12px !important;
}
.nav-gh:hover { border-color: #333a50; }
.nav-gh svg { width: 16px; height: 16px; fill: currentColor; }
.nav-toggle { display: none; margin-left: auto; background: none; border: 1px solid var(--border); color: var(--fg); border-radius: 8px; width: 40px; height: 38px; cursor: pointer; }
.nav-toggle svg { width: 18px; height: 18px; fill: currentColor; vertical-align: middle; }

/* ---------- buttons ---------- */

.btn {
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 600; font-size: 15px; padding: 11px 18px;
  border-radius: 10px; border: 1px solid transparent; cursor: pointer;
  transition: transform .12s ease, background .15s, border-color .15s, color .15s;
}
.btn:active { transform: translateY(1px); }
.btn-primary { background: linear-gradient(180deg, #8b93ff, #6f79f5); color: #0b0d13; }
.btn-primary:hover { color: #0b0d13; filter: brightness(1.06); }
.btn-ghost { background: var(--bg-elev); color: var(--fg); border-color: var(--border); }
.btn-ghost:hover { color: var(--fg); border-color: #3a4160; background: var(--bg-elev-2); }
.btn svg { width: 16px; height: 16px; fill: currentColor; }

/* ---------- pills / badges ---------- */

.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 13px; font-weight: 600; letter-spacing: .02em;
  color: var(--violet-ink); background: rgba(126, 136, 255, .1);
  border: 1px solid rgba(126, 136, 255, .22); border-radius: 999px; padding: 5px 12px;
}
.eyebrow .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 10px var(--green); }
.badges { display: flex; flex-wrap: wrap; gap: 8px; }
.badge { font: 500 12.5px var(--mono); color: var(--muted); border: 1px solid var(--border); border-radius: 7px; padding: 4px 9px; background: var(--bg-elev); }

/* ---------- hero ---------- */

.hero { padding: 74px 0 26px; }
.hero h1 { font-size: clamp(2.5rem, 6vw, 4.1rem); margin: 20px 0 0; }
.hero .tagline { font-size: clamp(1.05rem, 2.3vw, 1.3rem); color: var(--muted); max-width: 640px; margin: 18px 0 0; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 30px; }
.gradient-text {
  background: linear-gradient(100deg, var(--violet-2) 10%, var(--green) 120%);
  -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent;
}

/* ---------- sections ---------- */

section { padding: 46px 0; }
.section-head { max-width: 680px; margin-bottom: 34px; }
.section-head h2 { font-size: clamp(1.6rem, 3.4vw, 2.2rem); }
.section-head p { color: var(--muted); margin-top: 12px; font-size: 1.05rem; }
.rule { height: 1px; background: linear-gradient(90deg, transparent, var(--border), transparent); border: 0; margin: 0; }

/* ---------- cards ---------- */

.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  position: relative; display: flex; flex-direction: column;
  background: var(--bg-elev); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px; transition: transform .16s ease, border-color .16s, background .16s;
  overflow: hidden;
}
a.card:hover { transform: translateY(-3px); border-color: #39405e; background: var(--bg-elev-2); color: var(--fg); }
.card .kicker { font: 600 12.5px var(--mono); color: var(--violet-ink); letter-spacing: .04em; text-transform: uppercase; }
.card h3 { font-size: 1.3rem; margin: 12px 0 8px; }
.card p { color: var(--muted); font-size: .97rem; margin: 0; flex: 1; }
.card .go { margin-top: 18px; font-weight: 600; font-size: .95rem; color: var(--violet-ink); display: inline-flex; align-items: center; gap: 6px; }
a.card:hover .go { gap: 10px; }
.card-icon {
  width: 44px; height: 44px; border-radius: 11px; display: grid; place-items: center;
  background: rgba(126, 136, 255, .12); border: 1px solid rgba(126, 136, 255, .22); margin-bottom: 6px;
}
.card-icon svg { width: 24px; height: 24px; }

/* ---------- feature list ---------- */

.features { display: grid; grid-template-columns: repeat(2, 1fr); gap: 14px 30px; }
.feature { border-left: 2px solid var(--border); padding: 2px 0 2px 16px; }
.feature h4 { margin: 0 0 4px; font-size: 1rem; display: flex; align-items: center; gap: 8px; }
.feature h4 .tag { font: 600 11px var(--mono); color: var(--green-ink); background: rgba(91, 217, 154, .1); border: 1px solid rgba(91, 217, 154, .22); border-radius: 5px; padding: 1px 6px; }
.feature p { margin: 0; color: var(--muted); font-size: .92rem; }

/* ---------- steps ---------- */

.steps { counter-reset: step; display: grid; gap: 18px; }
.step { display: grid; grid-template-columns: 40px 1fr; gap: 16px; align-items: start; }
.step .num {
  counter-increment: step; width: 40px; height: 40px; border-radius: 50%;
  display: grid; place-items: center; font-weight: 700; color: var(--violet-ink);
  background: rgba(126, 136, 255, .1); border: 1px solid rgba(126, 136, 255, .25);
}
.step .num::before { content: counter(step); }
.step h4 { margin: 8px 0 4px; font-size: 1.05rem; }
.step p { margin: 0; color: var(--muted); }

/* ---------- code ---------- */

.code {
  position: relative; background: #0a0c12; border: 1px solid var(--border);
  border-radius: var(--radius-sm); overflow: hidden;
}
.code-head { display: flex; align-items: center; gap: 8px; padding: 10px 14px; border-bottom: 1px solid var(--border-soft); }
.code-head .dot { width: 11px; height: 11px; border-radius: 50%; background: #2a3042; }
.code-head .name { margin-left: 8px; font: 500 12.5px var(--mono); color: var(--faint); }
.code pre { margin: 0; padding: 18px; overflow-x: auto; font: 13.5px/1.7 var(--mono); color: #d7dbe6; }
.code .cp { color: var(--faint); }              /* comment */
.code .kw { color: #c4a0ff; }                    /* keyword */
.code .st { color: #8ff0c0; }                    /* string */
.code .fn { color: #8b93ff; }                    /* function / class */
.code .nm { color: #e9ebf2; }
.copy-btn {
  position: absolute; top: 8px; right: 8px; z-index: 2;
  background: var(--bg-elev); color: var(--muted); border: 1px solid var(--border);
  border-radius: 7px; font: 500 12px var(--sans); padding: 5px 10px; cursor: pointer;
}
.copy-btn:hover { color: var(--fg); border-color: #3a4160; }

.install {
  display: inline-flex; align-items: center; gap: 12px; font: 14px var(--mono);
  background: #0a0c12; border: 1px solid var(--border); border-radius: 10px; padding: 12px 16px; color: var(--fg);
}
.install .dollar { color: var(--green); }
.install .copy-inline { margin-left: 6px; background: none; border: 0; color: var(--faint); cursor: pointer; font: inherit; }
.install .copy-inline:hover { color: var(--fg); }

/* ---------- ascii diagram ---------- */

.ascii {
  background: #0a0c12; border: 1px solid var(--border); border-radius: var(--radius-sm);
  padding: 20px; overflow-x: auto; color: var(--muted);
  font: 13px/1.45 var(--mono); white-space: pre;
}

/* ---------- screenshots ---------- */

.shot { border: 1px solid var(--border); border-radius: 14px; overflow: hidden; background: #f4f5f7; box-shadow: 0 24px 60px -24px rgba(0, 0, 0, .6); }
.shot img { display: block; width: 100%; height: auto; }
.shot-frame { max-width: 940px; margin: 0 auto; }
.shot-cap { text-align: center; color: var(--faint); font-size: .9rem; margin-top: 14px; }
.shot-cap code { color: var(--muted); }

/* ---------- split (text + visual) ---------- */

.split { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }

/* ---------- footer ---------- */

.footer { border-top: 1px solid var(--border-soft); margin-top: 40px; padding: 46px 0 40px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 30px; }
.footer h5 { margin: 0 0 12px; font-size: 13px; letter-spacing: .05em; text-transform: uppercase; color: var(--faint); }
.footer a { display: block; color: var(--muted); font-size: 14px; padding: 4px 0; }
.footer a:hover { color: var(--fg); }
.footer .brand { margin-bottom: 12px; }
.footer .tag { color: var(--muted); font-size: 14px; max-width: 260px; }
.footer-bottom { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 10px; margin-top: 36px; padding-top: 22px; border-top: 1px solid var(--border-soft); color: var(--faint); font-size: 13px; }

/* ---------- responsive ---------- */

@media (max-width: 820px) {
  .grid-3, .grid-2, .features, .split { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .nav-links { display: none; position: absolute; top: 62px; left: 0; right: 0; flex-direction: column; align-items: stretch; gap: 2px; padding: 10px 14px 16px; background: var(--bg); border-bottom: 1px solid var(--border); }
  .nav-links.open { display: flex; }
  .nav-links a { padding: 12px; border-radius: 8px; }
  .nav-toggle { display: inline-block; }
  .hero { padding: 52px 0 20px; }
}