/* Material 3 — green tonal palette */
:root {
  --primary: #386a20;
  --on-primary: #ffffff;
  --primary-container: #b7f397;
  --on-primary-container: #082100;
  --secondary-container: #dce7d1;
  --on-secondary-container: #131f0d;
  --surface: #fcfdf6;
  --surface-container: #f0f4e9;
  --surface-container-high: #e9eee1;
  --on-surface: #1a1c17;
  --on-surface-variant: #44483d;
  --outline: #c3c8ba;
  --tertiary: #386569;
  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 14px;
  --font: "Google Sans", "Product Sans", "Roboto", system-ui, sans-serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 88px; }

body {
  font-family: var(--font);
  color: var(--on-surface);
  background: var(--surface);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.material-symbols-rounded {
  font-variation-settings: "FILL" 0, "wght" 400, "GRAD" 0, "opsz" 24;
  color: var(--primary);
  vertical-align: middle;
}

/* ---------- Top bar ---------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 32px;
  background: rgba(252, 253, 246, 0.85);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s ease;
}
.topbar.scrolled { border-bottom-color: var(--outline); }

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--on-surface);
}
.brand-mark { font-size: 28px; }
.brand-name { font-weight: 700; font-size: 1.05rem; letter-spacing: -0.2px; }

.nav { display: flex; align-items: center; gap: 8px; }
.nav a {
  text-decoration: none;
  color: var(--on-surface-variant);
  font-weight: 500;
  padding: 8px 16px;
  border-radius: 999px;
  transition: background 0.2s ease, color 0.2s ease;
}
.nav a:hover { background: var(--surface-container-high); color: var(--on-surface); }
.nav .nav-cta {
  background: var(--primary);
  color: var(--on-primary);
}
.nav .nav-cta:hover { background: #2f5a1a; color: #fff; }

.menu-btn {
  display: none;
  border: none;
  background: transparent;
  cursor: pointer;
  padding: 6px;
}
.menu-btn .material-symbols-rounded { font-size: 28px; }

/* ---------- Hero ---------- */
.hero {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 48px;
  align-items: center;
  max-width: 1180px;
  margin: 0 auto;
  padding: 72px 32px 48px;
}
.hero-copy h1 {
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -1px;
  font-weight: 700;
  color: var(--on-surface);
}
.lead {
  margin-top: 20px;
  font-size: 1.15rem;
  color: var(--on-surface-variant);
  max-width: 34ch;
}
.hero-actions { display: flex; gap: 14px; margin-top: 32px; flex-wrap: wrap; }
.hero-note {
  margin-top: 22px;
  color: var(--on-surface-variant);
  font-size: 0.9rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  font-weight: 500;
  padding: 13px 26px;
  border-radius: 999px;
  transition: transform 0.15s ease, background 0.2s ease, box-shadow 0.2s ease;
}
.btn-filled { background: var(--primary); color: var(--on-primary); }
.btn-filled:hover { background: #2f5a1a; box-shadow: 0 6px 18px rgba(56, 106, 32, 0.28); }
.btn-tonal { background: var(--secondary-container); color: var(--on-secondary-container); }
.btn-tonal:hover { background: #cfdcc3; }
.btn:active { transform: translateY(1px); }

.hero-media img {
  width: 100%;
  height: 460px;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: 0 12px 40px rgba(26, 28, 23, 0.12);
}

/* ---------- Mission cards ---------- */
.mission {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 1180px;
  margin: 40px auto;
  padding: 0 32px;
}
.card {
  background: var(--surface-container);
  border-radius: var(--radius-md);
  padding: 32px 28px;
}
.card .material-symbols-rounded { font-size: 32px; }
.card h3 { margin: 16px 0 8px; font-size: 1.25rem; font-weight: 700; }
.card p { color: var(--on-surface-variant); }

/* ---------- Impact ---------- */
.impact {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 48px;
  align-items: center;
  max-width: 1180px;
  margin: 88px auto;
  padding: 0 32px;
}
.impact-media img {
  width: 100%;
  height: 420px;
  object-fit: cover;
  border-radius: var(--radius-lg);
}
.impact-copy h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.5px;
  margin-bottom: 28px;
}
.stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
.stat {
  background: var(--primary-container);
  color: var(--on-primary-container);
  border-radius: var(--radius-md);
  padding: 24px;
}
.stat-num {
  display: block;
  font-size: 2.6rem;
  font-weight: 700;
  line-height: 1;
  color: var(--on-primary-container);
}
.stat-label { display: block; margin-top: 8px; font-size: 0.95rem; }

/* ---------- Section shared ---------- */
section h2 { text-align: center; }
.join, .board, .follow {
  max-width: 1180px;
  margin: 88px auto;
  padding: 0 32px;
}
.join h2, .board h2, .follow h2 {
  font-size: clamp(1.8rem, 3.5vw, 2.6rem);
  font-weight: 700;
  letter-spacing: -0.5px;
}
.section-sub {
  text-align: center;
  color: var(--on-surface-variant);
  margin: 10px 0 40px;
}

/* ---------- Join ---------- */
.join-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.join-card {
  display: flex;
  flex-direction: column;
  background: var(--surface-container);
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  padding: 30px 28px;
  text-decoration: none;
  color: var(--on-surface);
  transition: transform 0.18s ease, border-color 0.2s ease, background 0.2s ease;
}
.join-card:hover {
  transform: translateY(-4px);
  border-color: var(--primary);
  background: var(--surface-container-high);
}
.join-card .material-symbols-rounded { font-size: 34px; }
.join-card h3 { margin: 16px 0 8px; font-size: 1.2rem; font-weight: 700; }
.join-card p { color: var(--on-surface-variant); flex: 1; }
.join-link {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  margin-top: 18px;
  color: var(--primary);
  font-weight: 500;
}
.join-link .material-symbols-rounded { font-size: 20px; transition: transform 0.2s ease; }
.join-card:hover .join-link .material-symbols-rounded { transform: translateX(4px); }

/* ---------- Board ---------- */
.board-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}
.member {
  background: var(--surface-container);
  border-radius: var(--radius-sm);
  padding: 22px 20px;
}
.member-name { display: block; font-weight: 700; font-size: 1.05rem; }
.member-role { display: block; color: var(--on-surface-variant); font-size: 0.9rem; margin-top: 4px; }

/* ---------- Follow ---------- */
.follow-links {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  max-width: 720px;
  margin: 40px auto 0;
}
.follow-links a {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 6px;
  background: var(--surface-container);
  border-radius: var(--radius-md);
  padding: 28px;
  text-decoration: none;
  color: var(--on-surface);
  transition: background 0.2s ease, transform 0.18s ease;
}
.follow-links a:hover { background: var(--surface-container-high); transform: translateY(-3px); }
.follow-links .material-symbols-rounded { font-size: 30px; }
.follow-links span:nth-child(2) { font-weight: 700; font-size: 1.1rem; }
.follow-links .handle { color: var(--on-surface-variant); font-size: 0.92rem; }

/* ---------- Footer ---------- */
.footer {
  background: var(--surface-container);
  margin-top: 96px;
  padding: 48px 32px 32px;
}
.footer-inner {
  max-width: 1180px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.footer-inner p { color: var(--on-surface-variant); }
.copyright {
  max-width: 1180px;
  margin: 28px auto 0;
  color: var(--on-surface-variant);
  font-size: 0.88rem;
}
.copyright a {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
}
.copyright a:hover { text-decoration: underline; }

/* ---------- Reveal ---------- */
.reveal { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease, transform 0.6s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ---------- Responsive ---------- */
@media (max-width: 900px) {
  .nav { display: none; }
  .nav.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    right: 20px;
    background: var(--surface);
    border: 1px solid var(--outline);
    border-radius: var(--radius-md);
    padding: 12px;
    gap: 4px;
    box-shadow: 0 12px 32px rgba(26, 28, 23, 0.16);
  }
  .menu-btn { display: block; }
  .hero { grid-template-columns: 1fr; padding-top: 48px; }
  .hero-media img { height: 320px; }
  .mission { grid-template-columns: 1fr; }
  .impact { grid-template-columns: 1fr; margin: 64px auto; }
  .impact-media img { height: 300px; }
  .join-grid { grid-template-columns: 1fr; }
  .board-grid { grid-template-columns: 1fr 1fr; }
  .follow-links { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .topbar { padding: 14px 20px; }
  .hero, .mission, .impact, .join, .board, .follow { padding-left: 20px; padding-right: 20px; }
  .stats { grid-template-columns: 1fr 1fr; }
  .board-grid { grid-template-columns: 1fr; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto; }
  .reveal { transition: none; opacity: 1; transform: none; }
}