/* MathHell: Balance — landing / support / privacy.
   Colors and the squared-notebook look mirror the app's src/ui/theme.ts
   so the site feels like the product: warm paper, light-blue cell grid,
   blue-black ink, red-pen accents, Caveat handwriting. */

:root {
  --paper: #fbf8f0;
  --surface: #ffffff;
  --surface-alt: #f1ede2;
  --grid: rgba(96, 150, 220, 0.18);
  --margin: rgba(217, 83, 79, 0.45);
  --ink: #1e2a4a;
  --ink-soft: rgba(30, 42, 74, 0.66);
  --ink-faint: rgba(30, 42, 74, 0.4);
  --line: rgba(30, 42, 74, 0.22);
  --accent: #3b6fd4;
  --success: #3f9b6b;
  --warning: #e8963c;
  --danger: #d9534f;
  --r-card: 14px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica,
    Arial, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  /* the notebook page: paper + cell grid + the classic red margin line */
  background-color: var(--paper);
  background-image:
    linear-gradient(var(--grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid) 1px, transparent 1px);
  background-size: 28px 28px;
}

.wrap {
  max-width: 920px;
  margin: 0 auto;
  padding: 28px 22px 72px;
}

.hand {
  font-family: "Caveat", cursive;
}

/* ---------- Top bar ---------- */
.nav {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 40px;
}
.nav .logo {
  width: 42px;
  height: 42px;
  border-radius: 11px;
  border: 2px solid var(--line);
}
.nav .brand {
  font-weight: 700;
  letter-spacing: 0.2px;
  font-size: 17px;
}
.nav .spacer { flex: 1; }
.nav a {
  color: var(--ink-soft);
  text-decoration: none;
  font-size: 14px;
  margin-left: 18px;
}
.nav a:hover { color: var(--ink); }

/* ---------- Hero ---------- */
.hero {
  text-align: center;
  padding: 18px 0 8px;
}
.hero h1 {
  font-family: "Caveat", cursive;
  font-size: clamp(46px, 9vw, 84px);
  line-height: 1.02;
  margin: 0 0 16px;
  font-weight: 700;
  letter-spacing: -0.5px;
}
.hero h1 .accent { color: var(--accent); }
.hero h1 .danger { color: var(--danger); }
.hero p.lead {
  font-size: clamp(16px, 2.4vw, 20px);
  color: var(--ink-soft);
  max-width: 620px;
  margin: 0 auto 28px;
}

/* ---------- Buttons (ink outline, like the app's chalkBorder) ---------- */
.btn {
  display: inline-block;
  padding: 12px 26px;
  border-radius: var(--r-card);
  background: var(--surface);
  color: var(--ink);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  border: 2px solid var(--ink-soft);
  transition: transform 0.09s ease, background 0.12s ease;
}
.btn:hover { transform: translateY(-1px); background: var(--surface-alt); }
.btn:active { transform: scale(0.98); }
.btn.accent { color: var(--accent); border-color: var(--accent); }

.store-links {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
  margin: 2px auto 10px;
}
.store-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 48px;
  padding: 11px 16px;
  border-radius: var(--r-card);
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  font-weight: 700;
  font-size: 14px;
  border: 2px solid var(--ink);
  transition: transform 0.09s ease, background 0.12s ease;
}
.store-links.left { justify-content: flex-start; margin: 12px 0 0; }
.store-btn:hover { transform: translateY(-1px); background: var(--accent); border-color: var(--accent); }
.store-btn span { font-size: 17px; line-height: 1; }
.download-note {
  margin: 0 auto 18px;
  color: var(--ink-faint);
  font-size: 13px;
}

/* ---------- Feature cards ---------- */
.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 18px;
  margin: 56px 0;
}
.card {
  background: var(--surface);
  border-radius: var(--r-card);
  padding: 22px 22px 24px;
  border: 2px solid var(--line);
}
.card .dot {
  width: 38px;
  height: 38px;
  border-radius: 11px;
  display: grid;
  place-items: center;
  font-size: 20px;
  margin-bottom: 14px;
  background: var(--surface-alt);
  border: 1px solid var(--line);
}
.card h3 { margin: 0 0 6px; font-size: 17px; }
.card p { margin: 0; color: var(--ink-soft); font-size: 14.5px; }

/* ---------- Content pages (support / privacy) ---------- */
.page h1 {
  font-family: "Caveat", cursive;
  font-size: clamp(38px, 6vw, 56px);
  margin: 6px 0 6px;
  font-weight: 700;
}
.page .updated { color: var(--ink-faint); font-size: 13px; margin-bottom: 30px; }
.panel {
  background: var(--surface);
  border-radius: var(--r-card);
  padding: 26px 28px;
  border: 2px solid var(--line);
  margin-bottom: 20px;
}
.panel h2 {
  font-size: 19px;
  margin: 0 0 10px;
}
.panel h2 .tag { color: var(--accent); }
.panel p, .panel li { color: var(--ink-soft); font-size: 15px; }
.panel a { color: var(--accent); text-decoration: none; }
.panel a:hover { text-decoration: underline; }
.panel ul { padding-left: 20px; margin: 8px 0 0; }
.panel li { margin-bottom: 6px; }
.pill {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 600;
  color: var(--success);
  background: var(--surface-alt);
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  margin-bottom: 16px;
}
.mail {
  display: inline-block;
  margin-top: 6px;
  font-size: 17px;
  font-weight: 600;
}

/* ---------- Footer ---------- */
.footer {
  margin-top: 56px;
  padding-top: 24px;
  border-top: 2px solid var(--margin);
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  align-items: center;
  color: var(--ink-faint);
  font-size: 13.5px;
}
.footer a { color: var(--ink-soft); text-decoration: none; }
.footer a:hover { color: var(--ink); }
.footer .spacer { flex: 1; }