/* ============================================================
   Sulla Desktop — marketing site (index.html)
   Clean light/dark system. Steel-blue brand accent.
   Other pages keep using brand.css.
   ============================================================ */

:root {
  --bg: #f7f8fa;
  --bg-alt: #eef2f6;
  --card: #ffffff;
  --ink: #0f172a;
  --ink-2: #334155;
  --muted: #64748b;
  --line: #e2e8f0;
  --accent: #3d7fa0;
  --accent-ink: #ffffff;
  --accent-soft: #e4f0f6;
  --good: #15803d;
  --good-soft: #e7f6ec;
  --warn: #b45309;
  --warn-soft: #fdf3e3;
  --bad: #b91c1c;
  --bad-soft: #fdecec;
  --shadow: 0 1px 2px rgba(15, 23, 42, .04), 0 12px 32px -12px rgba(15, 23, 42, .16);
  --radius: 16px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --mono: 'JetBrains Mono', ui-monospace, Menlo, Consolas, monospace;
}

[data-theme="dark"] {
  --bg: #0d1117;
  --bg-alt: #11161d;
  --card: #161b22;
  --ink: #e6edf3;
  --ink-2: #c3ccd6;
  --muted: #8b949e;
  --line: #262d36;
  --accent: #6ab0cc;
  --accent-ink: #0d1117;
  --accent-soft: rgba(106, 176, 204, .12);
  --good: #4ade80;
  --good-soft: rgba(74, 222, 128, .12);
  --warn: #fbbf24;
  --warn-soft: rgba(251, 191, 36, .12);
  --bad: #f87171;
  --bad-soft: rgba(248, 113, 113, .12);
  --shadow: 0 1px 2px rgba(0, 0, 0, .3), 0 16px 40px -16px rgba(0, 0, 0, .6);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
code, .mono { font-family: var(--mono); }

.wrap { max-width: 1160px; margin: 0 auto; padding: 0 24px; }
.band { padding: 96px 0; }
.band.alt { background: var(--bg-alt); }
.center { text-align: center; }

/* ---------- type ---------- */
.eyebrow {
  font-size: 13px; font-weight: 700; letter-spacing: .08em; text-transform: uppercase;
  color: var(--accent); margin-bottom: 14px;
}
h1.display {
  font-size: clamp(40px, 6vw, 68px); line-height: 1.04; letter-spacing: -.03em; font-weight: 800;
}
h2.h2 { font-size: clamp(30px, 4vw, 44px); line-height: 1.1; letter-spacing: -.02em; font-weight: 800; }
h3.h3 { font-size: 20px; line-height: 1.3; font-weight: 700; }
.lead { font-size: 19px; color: var(--ink-2); max-width: 640px; }
.muted { color: var(--muted); }
.small { font-size: 14px; }
.section-head { max-width: 720px; margin-bottom: 48px; }
.section-head.center { margin-left: auto; margin-right: auto; }
.section-head.center .lead { margin: 16px auto 0; }
.section-head .lead { margin-top: 16px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 14px 22px; border-radius: 12px; font-weight: 700; font-size: 16px;
  background: var(--accent); color: var(--accent-ink); border: 1px solid var(--accent);
  box-shadow: 0 8px 20px -8px var(--accent); cursor: pointer; transition: transform .15s ease, filter .15s ease;
}
.btn:hover { transform: translateY(-1px); filter: brightness(1.05); }
.btn.ghost { background: var(--card); color: var(--ink); border-color: var(--line); box-shadow: none; }
.btn.small { padding: 9px 16px; font-size: 14px; border-radius: 10px; box-shadow: none; }
.icon-btn {
  width: 38px; height: 38px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--card); color: var(--ink); cursor: pointer; font-size: 16px;
}

/* ---------- header ---------- */
header.top {
  position: sticky; top: 0; z-index: 50;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(1.4) blur(12px);
  border-bottom: 1px solid var(--line);
}
.top-in { display: flex; align-items: center; gap: 28px; height: 68px; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 18px; letter-spacing: -.01em; }
.logo img { width: 30px; height: 30px; }
.logo .logo-dark { display: none; }
[data-theme="dark"] .logo .logo-light { display: none; }
[data-theme="dark"] .logo .logo-dark { display: block; }
nav.site { display: flex; gap: 24px; font-size: 15px; font-weight: 500; color: var(--ink-2); }
nav.site a:hover { color: var(--accent); }
.top-right { margin-left: auto; display: flex; align-items: center; gap: 10px; }
.menu-btn { display: none; }

/* ---------- hero ---------- */
.hero { padding: 72px 0 88px; position: relative; overflow: hidden; }
.hero::before {
  content: ''; position: absolute; inset: -200px -200px auto auto; width: 720px; height: 720px;
  background: radial-gradient(circle, var(--accent-soft) 0%, transparent 65%); pointer-events: none;
}
.hero > .wrap { position: relative; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; position: relative; }
.hero .lead { margin: 22px 0 28px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; }
.trust { margin-top: 22px; font-size: 14px; color: var(--muted); display: flex; flex-wrap: wrap; gap: 6px 18px; }
.trust span::before { content: '✓ '; color: var(--good); font-weight: 700; }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 26px; }
.chip {
  font-size: 13px; padding: 6px 12px; border-radius: 999px; border: 1px solid var(--line);
  background: var(--card); color: var(--ink-2);
}

/* ---------- automation demo card ---------- */
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: var(--shadow);
}
.demo { padding: 22px; }
.demo-head { display: flex; align-items: center; gap: 8px; padding-bottom: 14px; border-bottom: 1px solid var(--line); margin-bottom: 16px; }
.dot { width: 10px; height: 10px; border-radius: 50%; background: var(--line); }
.demo-title { margin-left: 6px; font-size: 13px; color: var(--muted); }
.ask {
  background: var(--accent-soft); border-radius: 12px; padding: 12px 14px; font-size: 15px; margin-bottom: 14px;
}
.ask b { color: var(--accent); font-size: 12px; text-transform: uppercase; letter-spacing: .06em; display: block; margin-bottom: 2px; }
.flow { display: grid; gap: 8px; }
.step { display: grid; grid-template-columns: 30px 1fr auto; gap: 12px; align-items: center; padding: 10px 12px; border: 1px solid var(--line); border-radius: 12px; font-size: 14px; }
.step .n { width: 30px; height: 30px; border-radius: 9px; display: grid; place-items: center; background: var(--accent-soft); color: var(--accent); font-weight: 800; font-size: 13px; }
.step small { display: block; color: var(--muted); font-size: 12.5px; }
.pill { font-size: 11.5px; font-weight: 700; padding: 4px 9px; border-radius: 999px; white-space: nowrap; }
.pill.good { background: var(--good-soft); color: var(--good); }
.pill.warn { background: var(--warn-soft); color: var(--warn); }
.pill.info { background: var(--accent-soft); color: var(--accent); }
.demo-foot { margin-top: 14px; font-size: 12.5px; color: var(--muted); }

/* ---------- compare ---------- */
.compare { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.compare .card { padding: 28px; }
.compare h3 { margin-bottom: 16px; }
.compare ul { list-style: none; display: grid; gap: 12px; }
.compare li { display: grid; grid-template-columns: 22px 1fr; gap: 10px; color: var(--ink-2); }
.compare .old li::before { content: '✕'; color: var(--bad); font-weight: 800; }
.compare .new { border-color: var(--accent); }
.compare .new li::before { content: '✓'; color: var(--good); font-weight: 800; }

/* ---------- how ---------- */
.how { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.how .card { padding: 26px; }
.num {
  width: 36px; height: 36px; border-radius: 10px; display: grid; place-items: center;
  background: var(--accent); color: var(--accent-ink); font-weight: 800; margin-bottom: 16px;
}
.how b { display: block; font-size: 18px; margin-bottom: 6px; }
.how span { color: var(--ink-2); }

/* ---------- shots ---------- */
.shot { border-radius: 14px; overflow: hidden; border: 1px solid var(--line); box-shadow: var(--shadow); background: #0d1117; }
.shot img { width: 100%; height: auto; }
.feature { display: grid; grid-template-columns: 1fr 1.2fr; gap: 56px; align-items: center; }
.feature.flip { grid-template-columns: 1.2fr 1fr; }
.feature.flip .feature-copy { order: 2; }
.feature + .feature { margin-top: 96px; }
.ticks { list-style: none; display: grid; gap: 14px; margin-top: 24px; }
.ticks li { display: grid; grid-template-columns: 24px 1fr; gap: 10px; }
.ticks li::before { content: '✓'; color: var(--accent); font-weight: 800; }
.ticks b { display: block; }
.ticks span { color: var(--muted); font-size: 15px; }

/* ---------- use cases ---------- */
.uses { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.use { padding: 24px; display: flex; flex-direction: column; gap: 10px; }
.use .ic { font-size: 26px; }
.use .trig { font-size: 12.5px; font-weight: 700; color: var(--accent); text-transform: uppercase; letter-spacing: .05em; }
.use p { color: var(--ink-2); font-size: 15px; }
.use .out { margin-top: auto; padding-top: 12px; border-top: 1px dashed var(--line); font-size: 14px; color: var(--muted); }

/* ---------- pillars ---------- */
.pillars { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.pillars .card { padding: 22px; }
.pillars .pi { font-size: 24px; margin-bottom: 10px; }
.pillars b { display: block; margin-bottom: 6px; }
.pillars span { color: var(--muted); font-size: 14.5px; }
@media (min-width: 981px) { .pillars.three { grid-template-columns: repeat(3, 1fr); } }
a.card { color: inherit; text-decoration: none; }

/* ---------- start ---------- */
.start { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.start .card { padding: 26px; }
.term {
  margin-top: 28px; display: flex; align-items: center; gap: 12px; flex-wrap: wrap;
  font-family: var(--mono); font-size: 14px; padding: 14px 18px; border-radius: 12px;
  background: #0d1117; color: #e6edf3; border: 1px solid #262d36;
}
.term .p { color: #6ab0cc; }
.term button { margin-left: auto; background: transparent; color: #8b949e; border: 1px solid #30363d; border-radius: 8px; padding: 4px 10px; cursor: pointer; font-family: var(--font); }
.get-app { margin-top: 28px; text-align: center; }
.dev-install { margin-top: 18px; }
.dev-install summary { cursor: pointer; font-size: 14px; color: var(--muted); text-align: center; }
.dev-install .term { margin-top: 12px; }
.reqs { margin-top: 18px; font-size: 14px; color: var(--muted); }

/* ---------- faq ---------- */
.faq { max-width: 820px; margin: 0 auto; display: grid; gap: 12px; }
.faq details { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 18px 22px; }
.faq summary { cursor: pointer; font-weight: 700; font-size: 17px; list-style: none; display: flex; justify-content: space-between; gap: 16px; }
.faq summary::after { content: '+'; color: var(--accent); font-size: 22px; line-height: 1; }
.faq details[open] summary::after { content: '–'; }
.faq p { margin-top: 12px; color: var(--ink-2); }

/* ---------- final cta ---------- */
.final { text-align: center; padding: 64px 32px; }
.final .lead { margin: 16px auto 28px; }
.final .hero-actions { justify-content: center; }

/* ---------- footer ---------- */
footer.site { border-top: 1px solid var(--line); padding: 56px 0 40px; font-size: 14px; }
.foot-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 32px; }
.foot-grid h4 { font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin-bottom: 12px; }
.foot-grid ul { list-style: none; display: grid; gap: 8px; }
.foot-grid a:hover { color: var(--accent); }
.copy { margin-top: 40px; color: var(--muted); font-size: 13px; }

/* ---------- reveal ---------- */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) { .reveal { opacity: 1; transform: none; transition: none; } }

/* ---------- responsive ---------- */
@media (max-width: 980px) {
  .hero-grid, .feature, .feature.flip, .compare { grid-template-columns: 1fr; }
  .feature.flip .feature-copy { order: 0; }
  .uses, .how, .start { grid-template-columns: 1fr 1fr; }
  .pillars { grid-template-columns: 1fr 1fr; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .band { padding: 68px 0; }
  nav.site { display: none; }
  .menu-open nav.site {
    display: grid; position: absolute; top: 68px; left: 0; right: 0; padding: 16px 24px 24px;
    background: var(--bg); border-bottom: 1px solid var(--line); gap: 14px;
  }
  .menu-btn { display: inline-block; }
  .top-right .btn { display: none; }
  .uses, .how, .start, .pillars { grid-template-columns: 1fr; }
}