/* ── Variables ── */
:root {
  --green: #22c55e;
  --dark: #0f172a;
  --paper: #f5f7fb;
  --paper-warm: #eef3f8;
  --ink: #0f172a;
  --ink-soft: #334155;
  --ink-mute: #64748b;
  --ink-faint: #94a3b8;
  --rule: #d1dce8;
  --white: #fff;
  --border: #e2e8f0;
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-serif: 'Source Serif 4', 'Iowan Old Style', Georgia, serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, 'SF Mono', Menlo, Consolas, monospace;
  --radius: 6px;
  --container: 1100px;
}

/* ── Reset ── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { display: block; max-width: 100%; }
a { text-decoration: none; color: inherit; }
button, input { font-family: inherit; border: none; cursor: pointer; }

/* ── Layout utilities ── */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 40px;
}

/* ── Measuring rule ── */
.measuring-rule {
  display: block;
  height: 1px;
  width: 100%;
  background-image: linear-gradient(to right, transparent 0, var(--rule) 1px, var(--rule) 2px, transparent 3px);
  background-size: 6px 1px;
  background-repeat: repeat-x;
}

/* ── Eyebrow label ── */
.eyebrow {
  font-size: 11px;
  font-weight: 500;
  font-family: var(--font-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 14px;
}

/* ── Section header (centered) ── */
.section-header {
  text-align: center;
  padding: 72px 40px 0;
}
.section-header h2 {
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 12px;
  line-height: 1.1;
}
.section-header .subtitle {
  font-size: 15px;
  color: var(--ink-mute);
  max-width: 520px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ── Email form shared ── */
.email-form {
  display: flex;
  gap: 8px;
  max-width: 420px;
}
.email-input {
  flex: 1;
  border: 1.5px solid var(--border);
  border-radius: 8px;
  padding: 11px 16px;
  font-size: 14px;
  color: var(--ink);
  background: var(--white);
  outline: none;
  transition: border-color 0.2s;
}
.email-input:focus { border-color: var(--green); }
.btn-primary {
  background: var(--dark);
  color: var(--white);
  font-size: 13px;
  font-weight: 600;
  padding: 11px 20px;
  border-radius: 100px;
  white-space: nowrap;
  transition: background-color 0.2s;
}
.btn-primary:hover { background: #1e3a2e; }
.btn-primary:disabled { opacity: 0.5; cursor: not-allowed; }
.form-note {
  font-size: 11px;
  font-family: var(--font-mono);
  letter-spacing: 0.05em;
  color: var(--ink-faint);
  margin-top: 8px;
}
.form-success {
  font-size: 14px;
  color: var(--green);
  font-weight: 600;
  padding: 12px 0;
}

/* ── Nav ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(245, 247, 251, 0.88);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border);
}
.nav-inner {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 40px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.nav-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}
.brand-pill {
  background: var(--green);
  color: var(--white);
  font-size: 11px;
  font-weight: 600;
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  padding: 5px 12px;
  border-radius: 4px;
}
.nav-sep {
  color: var(--rule);
  font-size: 14px;
  line-height: 1;
}
.nav-enviroai {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-mute);
  transition: color 0.2s;
}
.nav-enviroai:hover { color: var(--ink); }
.enviroai-logo {
  height: 22px;
  width: auto;
}
.btn-nav-cta {
  background: var(--green);
  color: var(--white);
  font-size: 13px;
  font-weight: 600;
  padding: 8px 18px;
  border-radius: 100px;
  transition: opacity 0.2s;
}
.btn-nav-cta:hover { opacity: 0.85; }

/* ── Hero ── */
.hero {
  background: linear-gradient(160deg, #f0fdf4 0%, #f5f7fb 55%);
  padding: 88px 0 80px;
  border-bottom: 1px solid var(--border);
}
.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.hero-headline {
  font-family: var(--font-serif);
  font-size: 44px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--dark);
  margin-bottom: 20px;
  letter-spacing: -0.01em;
}
.hero-headline em {
  font-style: italic;
  color: var(--green);
}
.hero-sub {
  font-size: 15px;
  color: var(--ink-soft);
  line-height: 1.75;
  margin-bottom: 28px;
  max-width: 420px;
}
.hero-stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}
.stat-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 22px 20px;
  border: 1px solid var(--border);
}
.stat-card.stat-wide {
  grid-column: span 2;
}
.stat-num {
  font-family: var(--font-serif);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--green);
  margin-bottom: 6px;
}
.stat-title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--ink);
  margin-bottom: 4px;
  letter-spacing: 0.04em;
}
.stat-label {
  font-size: 12px;
  color: var(--ink-mute);
  line-height: 1.5;
}

/* ── What is Climate Fresk ── */
.what-is { padding-bottom: 72px; }
.what-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin-top: 40px;
}
.feature-card {
  padding: 32px 28px;
  background: var(--paper);
}
.feature-card:nth-child(even) {
  background: var(--white);
}
.feature-label {
  font-size: 10.5px;
  font-weight: 500;
  font-family: var(--font-mono);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-bottom: 14px;
}
.feature-card h3 {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 10px;
  line-height: 1.2;
}
.feature-card p {
  font-size: 14px;
  color: var(--ink-soft);
  line-height: 1.7;
}

/* ── Why Philippines ── */
.why-ph {
  background: var(--dark);
  padding: 80px 0;
}
.why-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.why-content .eyebrow { color: rgba(255,255,255,0.35); }
.why-content h2 {
  font-family: var(--font-serif);
  font-size: 30px;
  font-weight: 700;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 18px;
}
.why-body {
  font-size: 15px;
  color: rgba(255,255,255,0.6);
  line-height: 1.8;
  margin-bottom: 20px;
}
.why-link {
  font-size: 12px;
  font-family: var(--font-mono);
  letter-spacing: 0.06em;
  color: var(--green);
  text-transform: uppercase;
  transition: opacity 0.2s;
}
.why-link:hover { opacity: 0.75; }
.why-stats {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.dark-stat {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 18px 22px;
  display: flex;
  align-items: center;
  gap: 18px;
}
.dark-stat-num {
  font-family: var(--font-serif);
  font-size: 30px;
  font-weight: 700;
  color: var(--green);
  min-width: 60px;
  flex-shrink: 0;
}
.dark-stat-text {
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  line-height: 1.55;
}

/* ── How It Works ── */
.how-it-works { padding-bottom: 80px; }
.steps {
  display: flex;
  align-items: flex-start;
  gap: 0;
  margin-top: 44px;
}
.step {
  flex: 1;
  text-align: center;
  padding: 0 28px;
}
.step-num {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--green);
  color: var(--white);
  font-size: 16px;
  font-weight: 600;
  font-family: var(--font-mono);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 18px;
}
.step h3 {
  font-family: var(--font-serif);
  font-size: 17px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 8px;
}
.step p {
  font-size: 14px;
  color: var(--ink-mute);
  line-height: 1.7;
}
.step-arrow {
  font-size: 18px;
  color: var(--rule);
  flex-shrink: 0;
  padding-top: 12px;
  align-self: flex-start;
}

/* ── CTA Band ── */
.cta-band {
  background: var(--green);
  padding: 80px 0;
}
.cta-inner {
  text-align: center;
  max-width: 520px;
}
.cta-band .eyebrow { color: rgba(255,255,255,0.55); }
.cta-band h2 {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 700;
  color: var(--white);
  line-height: 1.2;
  margin-bottom: 12px;
}
.cta-band p {
  font-size: 15px;
  color: rgba(255,255,255,0.8);
  margin-bottom: 28px;
  line-height: 1.65;
}
.cta-form { margin: 0 auto; }
.cta-input {
  background: rgba(255,255,255,0.95);
  border-color: transparent;
}
.cta-input:focus { border-color: var(--dark); }
.btn-cta {
  background: var(--dark);
}
.btn-cta:hover { background: var(--dark); opacity: 0.85; }
.cta-success { color: var(--white); }
.cta-band .form-note { color: rgba(255,255,255,0.55); }

/* ── Footer ── */
.footer {
  background: var(--dark);
  padding: 40px 0;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}
.footer-brand { display: flex; flex-direction: column; gap: 8px; }
.footer-logos {
  display: flex;
  align-items: center;
  gap: 12px;
}
.brand-pill-sm {
  font-size: 10px;
  padding: 4px 10px;
}
.footer-tagline {
  font-size: 10.5px;
  font-family: var(--font-mono);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.22);
}
.footer-links {
  display: flex;
  gap: 22px;
}
.footer-links a {
  font-size: 12px;
  font-family: var(--font-mono);
  color: rgba(255,255,255,0.32);
  transition: color 0.2s;
}
.footer-links a:hover { color: rgba(255,255,255,0.65); }
.footer-copy {
  font-size: 11px;
  font-family: var(--font-mono);
  letter-spacing: 0.08em;
  color: rgba(255,255,255,0.18);
}
.footer .nav-enviroai { color: rgba(255,255,255,0.45); }
.footer .nav-sep { color: rgba(255,255,255,0.15); }

/* ── Responsive ── */
@media (max-width: 768px) {
  .container { padding: 0 20px; }
  .nav-inner { padding: 0 20px; }

  .nav-enviroai span { display: none; }

  .hero { padding: 56px 0 64px; }
  .hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-headline { font-size: 32px; }
  .hero-sub { max-width: 100%; }
  .email-form { flex-direction: column; max-width: 100%; }
  .btn-primary { width: 100%; text-align: center; padding: 13px 20px; }

  .what-cards { grid-template-columns: 1fr; }

  .why-inner { grid-template-columns: 1fr; gap: 36px; }

  .steps {
    flex-direction: column;
    align-items: center;
    gap: 8px;
  }
  .step { max-width: 320px; }
  .step-arrow { transform: rotate(90deg); align-self: center; }

  .section-header { padding: 56px 20px 0; }
  .section-header h2 { font-size: 26px; }

  .cta-band { padding: 64px 0; }
  .cta-band h2 { font-size: 26px; }
  .cta-form { flex-direction: column; }
  .btn-cta { width: 100%; text-align: center; }

  .footer-inner {
    flex-direction: column;
    align-items: flex-start;
    gap: 20px;
  }
}