/* ShareHub marketing site — design tokens, reset, fluid typography */

:root {
  --c-primary: #0F1F3D;
  --c-primary-soft: #1E3361;
  --c-accent: #2D7FF9;
  --c-accent2: #F97316;
  --c-accent2-soft: #FFEDD5;
  --c-pos: #10B981;
  --c-accent-deep: #1B5FCB;
  --c-accent-soft: #DDE9FF;
  --c-warn: #F59E0B;
  --c-info: #3B82F6;

  --c-bg: #FFFFFF;
  --c-bg-alt: #F7F9FC;
  --c-card: #FFFFFF;
  --c-border: #E5E9F2;
  --c-border-strong: #CBD3E1;

  --c-text: #0B1220;
  --c-text-mute: #475569;
  --c-text-soft: #8A93A6;
  --c-text-invert: #FFFFFF;

  --r-md: 12px;
  --r-lg: 16px;
  --r-xl: 22px;
  --sh-1: 0 1px 2px rgba(15, 31, 61, 0.05), 0 1px 1px rgba(15, 31, 61, 0.03);
  --sh-2: 0 8px 28px rgba(15, 31, 61, 0.08), 0 2px 6px rgba(15, 31, 61, 0.04);
  --sh-3: 0 24px 60px rgba(15, 31, 61, 0.16);

  --f-sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --f-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;

  --header-h: 68px;
  --container-max: 1180px;
}

* { box-sizing: border-box; }
*::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }
html, body {
  margin: 0;
  padding: 0;
  background: var(--c-bg);
  color: var(--c-text);
  font-family: var(--f-sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color 0.15s ease; }
button { font: inherit; color: inherit; cursor: pointer; border: none; background: none; padding: 0; }
input, textarea, select { font: inherit; color: inherit; }

h1, h2, h3, h4 { margin: 0; font-weight: 700; letter-spacing: -0.02em; line-height: 1.18; }
h1 { font-size: clamp(2.1rem, 5vw, 3.4rem); }
h2 { font-size: clamp(1.6rem, 3.6vw, 2.2rem); }
h3 { font-size: clamp(1.15rem, 2vw, 1.3rem); }
h4 { font-size: 1.02rem; }
p { margin: 0; }

.lead {
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  color: var(--c-text-mute);
  line-height: 1.65;
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 20px;
}

.section {
  padding: clamp(48px, 7vw, 88px) 0;
}
.section-alt { background: var(--c-bg-alt); }

.eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--c-accent-deep);
  background: var(--c-accent-soft);
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 14px;
}

.muted { color: var(--c-text-mute); }
.soft  { color: var(--c-text-soft); }
.num   { font-variant-numeric: tabular-nums; }
.mono  { font-family: var(--f-mono); }
.center { text-align: center; }
.pos { color: var(--c-pos); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  height: 48px;
  padding: 0 22px;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid transparent;
  transition: transform 0.06s ease, background 0.18s ease, box-shadow 0.18s ease;
  white-space: nowrap;
}
.btn:active { transform: scale(0.98); }
.btn-primary {
  background: var(--c-primary);
  color: #fff;
}
.btn-primary:hover { background: var(--c-primary-soft); box-shadow: var(--sh-2); }
.btn-accent {
  background: var(--c-accent);
  color: #fff;
}
.btn-accent:hover { background: #1B5FCB; box-shadow: var(--sh-2); }
.btn-ghost {
  background: transparent;
  color: var(--c-text);
  border-color: var(--c-border-strong);
}
.btn-ghost:hover { background: var(--c-bg-alt); }
.btn-sm { height: 38px; padding: 0 14px; font-size: 0.86rem; border-radius: 10px; }

/* Pill / chip */
.chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  height: 22px;
  padding: 0 8px;
  border-radius: 999px;
  font-size: 0.72rem;
  font-weight: 600;
  background: var(--c-bg-alt);
  color: var(--c-text-mute);
  border: 1px solid var(--c-border);
}
.chip-accent { background: var(--c-accent-soft); color: var(--c-accent-deep); border-color: #B6CFFE; }

/* Grid helpers */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
@media (max-width: 900px) {
  .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); gap: 18px; }
}
@media (max-width: 600px) {
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; gap: 14px; }
}

.stack > * + * { margin-top: 16px; }