/* ─────────────────────────────────────────────
   Material Design 3 color tokens
   Seed: #77DD77
   ───────────────────────────────────────────── */
:root {
  /* Primary */
  --md-primary:                #3D6B3D;
  --md-on-primary:             #FFFFFF;
  --md-primary-container:      #BDEAB9;
  --md-on-primary-container:   #002107;

  /* Secondary */
  --md-secondary:              #516650;
  --md-on-secondary:           #FFFFFF;
  --md-secondary-container:    #D4EAD0;
  --md-on-secondary-container: #0F1F0E;

  /* Tertiary */
  --md-tertiary:               #3A666D;
  --md-on-tertiary:            #FFFFFF;
  --md-tertiary-container:     #BDEAF1;
  --md-on-tertiary-container:  #002025;

  /* Surface & Background */
  --md-background:             #F8FBF7;
  --md-on-background:          #1A1D19;
  --md-surface:                #F8FBF7;
  --md-on-surface:             #1A1D19;
  --md-surface-variant:        #DCE5D8;
  --md-on-surface-variant:     #404941;

  /* Outline */
  --md-outline:                #717A6F;
  --md-outline-variant:        #C0C9BC;

  /* Inverse */
  --md-inverse-surface:        #2E312D;
  --md-inverse-on-surface:     #F0F1EB;
  --md-inverse-primary:        #A2D49E;
}

/* ─────────────────────────────────────────────
   Reset & base
   ───────────────────────────────────────────── */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--md-on-background);
  background: var(--md-background);
}

/* ─────────────────────────────────────────────
   Header
   ───────────────────────────────────────────── */
header {
  background: #FFFFFF;
  border-bottom: 1px solid var(--md-outline-variant);
  padding: 16px 0;
}

header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

header .logo {
  font-size: 20px;
  font-weight: 700;
  color: var(--md-primary);
  text-decoration: none;
  letter-spacing: -0.3px;
}

nav a {
  color: var(--md-on-surface-variant);
  text-decoration: none;
  margin-left: 24px;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.15s;
}

nav a:hover {
  color: var(--md-primary);
}

nav a.active {
  color: var(--md-primary);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ─────────────────────────────────────────────
   Layout
   ───────────────────────────────────────────── */
.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 24px;
}

main {
  padding: 48px 0 80px;
}

/* ─────────────────────────────────────────────
   Document page typography
   ───────────────────────────────────────────── */
.page-title {
  font-size: 32px;
  font-weight: 700;
  color: var(--md-on-background);
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}

.updated-date {
  font-size: 14px;
  color: var(--md-on-surface-variant);
  margin-bottom: 40px;
}

h1 {
  font-size: 18px;
  font-weight: 600;
  color: var(--md-primary);
  margin-top: 40px;
  margin-bottom: 10px;
}

h1:first-of-type {
  margin-top: 0;
}

p {
  margin-bottom: 16px;
  color: var(--md-on-surface);
}

ul {
  margin: 0 0 16px 24px;
  color: var(--md-on-surface);
}

ul li {
  margin-bottom: 8px;
}

a {
  color: var(--md-primary);
}

a:hover {
  color: var(--md-on-primary-container);
}

/* ─────────────────────────────────────────────
   Index hero
   ───────────────────────────────────────────── */
.hero {
  text-align: center;
  padding: 80px 0 60px;
}

.hero h1 {
  font-size: 36px;
  font-weight: 700;
  color: var(--md-on-background);
  margin-top: 0;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.hero p {
  font-size: 18px;
  color: var(--md-on-surface-variant);
  max-width: 520px;
  margin: 0 auto 40px;
}

/* ─────────────────────────────────────────────
   Cards
   ───────────────────────────────────────────── */
.cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  max-width: 680px;
  margin: 0 auto;
}

.card {
  background: #FFFFFF;
  border: 1px solid var(--md-outline-variant);
  border-radius: 12px;
  padding: 32px 28px;
  text-decoration: none;
  color: inherit;
  transition: background 0.15s, border-color 0.15s, box-shadow 0.15s;
  text-align: left;
}

.card:hover {
  background: var(--md-primary-container);
  border-color: var(--md-primary);
  box-shadow: 0 2px 10px rgba(61, 107, 61, 0.12);
}

.card h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--md-on-surface);
  margin-bottom: 8px;
}

.card p {
  font-size: 14px;
  color: var(--md-on-surface-variant);
  margin: 0;
}

/* ─────────────────────────────────────────────
   Footer
   ───────────────────────────────────────────── */
footer {
  background: var(--md-surface-variant);
  border-top: 1px solid var(--md-outline-variant);
  padding: 24px 0;
  font-size: 13px;
  color: var(--md-on-surface-variant);
  text-align: center;
}

footer a {
  color: var(--md-primary);
  text-decoration: none;
  margin: 0 12px;
  font-weight: 500;
}

footer a:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ─────────────────────────────────────────────
   Responsive
   ───────────────────────────────────────────── */
@media (max-width: 520px) {
  .cards {
    grid-template-columns: 1fr;
  }

  .hero h1 {
    font-size: 28px;
  }

  .page-title {
    font-size: 26px;
  }
}