/* ==========================================================================
   docs.odok.ai — Odokai brand
   Reference: /odokai-business/design-system/odokai-brand-guidelines.md
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Sora:wght@700&display=swap');

:root {
  --brand-primary: #32CD32;
  --brand-primary-hover: #28B428;
  --brand-dark: #0A0A0A;
  --page-bg: #FFFFFF;
  --text-primary: #0A0A0A;
  --text-muted: #666666;
  --border-subtle: #E5E5E5;
  --surface-card: #F9F9F9;

  --container-max: 1240px;
  --container-gutter: clamp(20px, 2.6vw, 32px);

  color-scheme: light;
}

* { box-sizing: border-box; border-radius: 0; }

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-feature-settings: "ss01", "cv11", "calt", "kern", "liga";
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  color: var(--text-primary);
  background: var(--page-bg);
  line-height: 1.6;
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--container-gutter);
  padding-right: var(--container-gutter);
}

h1, h2, h3 { letter-spacing: -0.02em; line-height: 1.15; }

h2 { font-size: clamp(30px, 4vw, 48px); font-weight: 700; margin: 0 0 12px; }

.lead { font-size: 20px; color: var(--text-muted); max-width: 640px; margin: 0 0 40px; }

/* Header */
.site-header {
  background: var(--page-bg);
  border-bottom: 1px solid var(--border-subtle);
}

.nav-row { display: flex; align-items: center; gap: 32px; height: 64px; }

.logo {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.028em;
  text-decoration: none;
  color: var(--brand-dark);
}

.nav { display: flex; gap: 24px; margin-left: auto; }

.nav a {
  font-size: 15px;
  font-weight: 500;
  color: #5B5B5B;
  text-decoration: none;
  transition: color 0.22s cubic-bezier(0.22, 1, 0.36, 1);
}

.nav a:hover, .nav a.active { color: var(--text-primary); }

/* Hero: dark, Sora display, green rule */
.hero {
  background: var(--brand-dark);
  color: #FFFFFF;
  padding: clamp(72px, 8vw, 104px) 0;
}

.hero-rule { width: 64px; height: 4px; background: var(--brand-primary); margin-bottom: 32px; }

.hero h1 {
  font-family: 'Sora', 'Inter', sans-serif;
  font-size: clamp(42px, 7vw, 96px);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.0;
  margin: 0 0 24px;
}

.hero-lead {
  font-size: clamp(18px, 2.8vw, 28px);
  line-height: 1.35;
  color: rgba(255, 255, 255, 0.85);
  max-width: 620px;
  margin: 0;
}

/* Sections */
.section { padding: clamp(64px, 7vw, 88px) 0; }
.section-alt { background: var(--surface-card); }

/* Cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  padding: clamp(28px, 3vw, 36px);
  transition: transform 0.22s cubic-bezier(0.22, 1, 0.36, 1),
              border-color 0.22s cubic-bezier(0.22, 1, 0.36, 1),
              box-shadow 0.22s cubic-bezier(0.22, 1, 0.36, 1);
}

.feature-card:hover {
  transform: translateY(-3px);
  border-color: var(--brand-primary);
  box-shadow: 0 6px 16px rgba(50, 205, 50, 0.12);
}

.feature-card h3 { font-size: 24px; font-weight: 500; margin: 0 0 8px; }

.feature-card p { margin: 0 0 20px; color: var(--text-muted); }

.feature-card p:last-child { margin-bottom: 0; }

.feature-card .btn { margin-top: 4px; }

/* Buttons */
.btn {
  display: inline-block;
  background: var(--brand-primary);
  color: #000000;
  font-family: inherit;
  font-size: 14px;
  font-weight: 600;
  letter-spacing: -0.005em;
  text-decoration: none;
  border: 1px solid var(--brand-primary);
  padding: 10px 20px;
  cursor: pointer;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.06);
  transition: background 0.22s cubic-bezier(0.22, 1, 0.36, 1),
              transform 0.15s cubic-bezier(0.22, 1, 0.36, 1);
}

.btn:hover {
  background: var(--brand-primary-hover);
  transform: translateY(-1px);
}

.btn:focus-visible { outline: 2px solid var(--brand-primary); outline-offset: 3px; }

/* Footer */
.site-footer {
  background: var(--brand-dark);
  color: var(--text-muted);
  padding: 40px 0;
  font-size: 14px;
}

.site-footer p { margin: 0; }