/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --green: #2d7a45;
  --green-light: #e6f4ec;
  --green-dark: #1a4f2e;
  --gold: #e8a020;
  --gold-light: #fef6e4;
  --blue: #1a6896;
  --blue-light: #e6f2fa;
  --text: #1a1a2e;
  --text-muted: #5a5a72;
  --bg: #fafaf8;
  --white: #ffffff;
  --border: #e8e8e0;
  --radius: 16px;
  --shadow: 0 4px 24px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 48px rgba(0,0,0,0.12);
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  font-size: 16px;
}

a { text-decoration: none; color: inherit; }

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 15px;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all 0.2s ease;
  white-space: nowrap;
}

.btn-primary {
  background: var(--green);
  color: white;
  border-color: var(--green);
}
.btn-primary:hover { background: var(--green-dark); border-color: var(--green-dark); transform: translateY(-1px); box-shadow: 0 6px 20px rgba(45,122,69,0.35); }

.btn-outline {
  background: transparent;
  color: var(--green);
  border-color: var(--green);
}
.btn-outline:hover { background: var(--green-light); }

.btn-sm { padding: 10px 20px; font-size: 14px; }
.btn-full { width: 100%; justify-content: center; font-size: 16px; padding: 16px; }

/* ===== NAV ===== */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(250,250,248,0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 18px;
  font-weight: 500;
}
.logo strong { font-weight: 800; color: var(--green); }
.logo-icon { font-size: 24px; }

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a:not(.btn) {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  transition: color 0.2s;
}
.nav-links a:not(.btn):hover { color: var(--text); }

.hamburger {
  display: none;
  background: none;
  border: none;
  font-size: 22px;
  cursor: pointer;
  color: var(--text);
}

.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 4px;
  padding: 12px 24px 16px;
  border-top: 1px solid var(--border);
}
.mobile-menu a { padding: 10px 0; font-weight: 500; color: var(--text-muted); }
.mobile-menu.open { display: flex; }

/* ===== HERO ===== */
.hero {
  text-align: center;
  padding: 96px 24px 80px;
  max-width: 860px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-block;
  background: var(--green-light);
  color: var(--green-dark);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.5px;
  padding: 6px 16px;
  border-radius: 50px;
  margin-bottom: 24px;
  border: 1px solid rgba(45,122,69,0.2);
}

.hero h1 {
  font-family: 'Playfair Display', Georgia, serif;
  font-size: clamp(36px, 6vw, 68px);
  font-weight: 800;
  line-height: 1.12;
  margin-bottom: 24px;
  color: var(--text);
}

.highlight {
  color: var(--green);
  position: relative;
}

.hero-sub {
  font-size: clamp(16px, 2.5vw, 19px);
  color: var(--text-muted);
  max-width: 640px;
  margin: 0 auto 40px;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: white;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.stat {
  padding: 28px 40px;
  text-align: center;
  flex: 1;
  min-width: 180px;
}
.stat-num {
  display: block;
  font-size: 32px;
  font-weight: 800;
  color: var(--green);
  line-height: 1;
  margin-bottom: 6px;
}
.stat-label {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.4;
}
.stat-div {
  width: 1px;
  height: 60px;
  background: var(--border);
}

/* ===== PROBLEM ===== */
.problem {
  background: linear-gradient(135deg, #1a1a2e 0%, #2d3a20 100%);
  color: white;
  padding: 64px 24px;
  text-align: center;
}
.problem h2 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(24px, 4vw, 38px);
  margin-bottom: 16px;
  color: #f0f0e8;
}
.problem p {
  max-width: 640px;
  margin: 0 auto;
  color: rgba(255,255,255,0.72);
  font-size: 17px;
  line-height: 1.7;
}

/* ===== POLLUTION SECTION ===== */
.pollution { background: #0e0e18; }

/* Banner */
.pollution-banner {
  padding: 80px 24px 64px;
  text-align: center;
  background: linear-gradient(180deg, #0e0e18 0%, #1c1208 100%);
  position: relative;
  overflow: hidden;
}
.pollution-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse 80% 60% at 50% 100%, rgba(200,80,20,0.18) 0%, transparent 70%);
  pointer-events: none;
}
.pollution-banner h2 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(28px, 5vw, 52px);
  color: #f5ede0;
  margin-bottom: 20px;
  position: relative;
}
.pollution-banner p {
  max-width: 660px;
  margin: 0 auto;
  color: rgba(255,255,255,0.62);
  font-size: 17px;
  line-height: 1.8;
  position: relative;
}

/* Stats bar */
.pollution-stats-bar {
  background: #1a1208;
  border-top: 1px solid rgba(255,120,30,0.2);
  border-bottom: 1px solid rgba(255,120,30,0.2);
  padding: 0 24px;
}
.p-stats {
  display: flex;
  align-items: stretch;
  flex-wrap: wrap;
}
.p-stat {
  flex: 1;
  min-width: 200px;
  padding: 32px 28px;
  text-align: center;
}
.p-stat-num {
  display: block;
  font-size: 30px;
  font-weight: 800;
  color: #ff7a1a;
  line-height: 1;
  margin-bottom: 8px;
}
.p-stat-label {
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  line-height: 1.5;
}
.p-stat-div {
  width: 1px;
  background: rgba(255,120,30,0.2);
  margin: 20px 0;
}

/* Gases grid */
.pollution-gases {
  background: #111118;
  padding: 80px 24px;
}
.gases-header {
  text-align: center;
  margin-bottom: 48px;
}
.gases-header h3 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(24px, 4vw, 38px);
  color: #f5ede0;
  margin-bottom: 14px;
}
.gases-header p {
  color: rgba(255,255,255,0.55);
  font-size: 16px;
  max-width: 560px;
  margin: 0 auto;
  line-height: 1.7;
}
.gases-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 20px;
}
.gas-card {
  border-radius: var(--radius);
  padding: 28px 24px;
  border: 1px solid rgba(255,255,255,0.07);
  transition: transform 0.2s, border-color 0.2s;
}
.gas-card:hover { transform: translateY(-3px); border-color: rgba(255,255,255,0.15); }
.gas-icon { font-size: 28px; margin-bottom: 10px; }
.gas-name { font-size: 17px; font-weight: 700; color: #f0e8d8; margin-bottom: 4px; }
.gas-amount { font-size: 12px; font-weight: 600; letter-spacing: 0.5px; margin-bottom: 10px; }
.gas-desc { font-size: 14px; color: rgba(255,255,255,0.5); line-height: 1.6; }
.gas-red    { background: rgba(180,40,20,0.18); } .gas-red .gas-amount { color: #ff7060; }
.gas-orange { background: rgba(200,90,10,0.18); } .gas-orange .gas-amount { color: #ff9040; }
.gas-yellow { background: rgba(180,140,0,0.18);  } .gas-yellow .gas-amount { color: #ffc930; }
.gas-purple { background: rgba(100,40,160,0.18); } .gas-purple .gas-amount { color: #b080ff; }
.gas-brown  { background: rgba(120,60,20,0.18);  } .gas-brown .gas-amount { color: #d4905a; }
.gas-gray   { background: rgba(60,80,60,0.22);   } .gas-gray .gas-amount { color: #80c870; }

/* Health impact */
.pollution-health {
  background: #0e0e18;
  padding: 80px 24px;
}
.pollution-health .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}
.health-text h3 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(24px, 3.5vw, 36px);
  color: #f5ede0;
  margin-bottom: 14px;
}
.health-text > p {
  color: rgba(255,255,255,0.6);
  font-size: 16px;
  line-height: 1.8;
  margin-bottom: 28px;
}
.health-text > p strong { color: #ff7a1a; }
.health-facts { display: flex; flex-direction: column; gap: 20px; }
.health-fact {
  display: flex;
  gap: 14px;
  align-items: flex-start;
}
.hf-icon { font-size: 24px; flex-shrink: 0; margin-top: 2px; }
.health-fact div { display: flex; flex-direction: column; gap: 4px; }
.health-fact strong { font-size: 15px; color: #f0e0cc; }
.health-fact span { font-size: 13px; color: rgba(255,255,255,0.5); line-height: 1.6; }

/* AQI visual */
.aqi-display {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 32px 28px;
}
.aqi-label {
  font-size: 13px;
  font-weight: 600;
  color: rgba(255,255,255,0.5);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 24px;
}
.aqi-bars {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  height: 200px;
  margin-bottom: 16px;
}
.aqi-bar {
  flex: 1;
  height: var(--h);
  background: var(--c);
  border-radius: 6px 6px 0 0;
  opacity: 0.4;
  position: relative;
  cursor: default;
  transition: opacity 0.2s;
}
.aqi-bar.aqi-active {
  opacity: 1;
  box-shadow: 0 0 20px rgba(126,0,35,0.6), 0 0 40px rgba(126,0,35,0.3);
}
.aqi-bar::after {
  content: attr(data-label);
  position: absolute;
  bottom: -36px;
  left: 50%;
  transform: translateX(-50%);
  font-size: 9px;
  color: rgba(255,255,255,0.4);
  white-space: nowrap;
  text-align: center;
}
.aqi-bar.aqi-active::after { color: #ff7a1a; font-weight: 700; }
.aqi-note {
  font-size: 12px;
  color: rgba(255,255,255,0.3);
  text-align: center;
  margin-top: 44px;
}

/* Bridge */
.pollution-bridge {
  background: linear-gradient(180deg, #1a1208 0%, #0e1a12 100%);
  padding: 80px 24px;
  text-align: center;
  border-top: 1px solid rgba(255,120,30,0.15);
}
.bridge-content {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 32px;
  flex-wrap: wrap;
  margin-bottom: 40px;
}
.bridge-left, .bridge-right {
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 32px 28px;
  max-width: 340px;
  text-align: left;
  flex: 1;
  min-width: 260px;
}
.bridge-left { border-color: rgba(255,80,20,0.3); }
.bridge-right { border-color: rgba(45,122,69,0.4); }
.bridge-emoji { font-size: 36px; display: block; margin-bottom: 12px; }
.bridge-left h4, .bridge-right h4 { font-size: 18px; font-weight: 700; color: #f5ede0; margin-bottom: 10px; }
.bridge-left p, .bridge-right p { font-size: 14px; color: rgba(255,255,255,0.55); line-height: 1.7; }
.bridge-arrow {
  font-size: 32px;
  color: var(--green);
  font-weight: 300;
  flex-shrink: 0;
}

/* ===== SECTION LABELS ===== */
.section-label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--green);
  margin-bottom: 12px;
}
.section-label.light { color: rgba(255,255,255,0.7); }

.section-sub {
  color: var(--text-muted);
  font-size: 18px;
  max-width: 540px;
  margin: 0 auto 56px;
  text-align: center;
}

/* ===== HOW IT WORKS ===== */
.how {
  padding: 100px 24px;
  text-align: center;
}
.how h2 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(28px, 4vw, 42px);
  margin-bottom: 16px;
}

.steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
  flex-wrap: wrap;
}

.step {
  background: white;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 36px 28px;
  text-align: center;
  flex: 1;
  min-width: 200px;
  max-width: 240px;
  box-shadow: var(--shadow);
  transition: transform 0.2s, box-shadow 0.2s;
}
.step:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }

.step-icon { font-size: 40px; margin-bottom: 12px; }
.step-num {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 2px;
  color: var(--green);
  margin-bottom: 12px;
}
.step h3 { font-size: 17px; font-weight: 700; margin-bottom: 10px; }
.step p { font-size: 14px; color: var(--text-muted); line-height: 1.6; }

.step-arrow {
  font-size: 24px;
  color: var(--border);
  padding: 0 8px;
  margin-top: 80px;
  flex-shrink: 0;
}

/* ===== IMPACT ===== */
.impact {
  background: #f4f4f0;
  padding: 100px 24px;
  text-align: center;
}
.impact h2 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(28px, 4vw, 42px);
  margin-bottom: 48px;
}

.impact-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px;
  text-align: left;
}

.impact-card {
  background: white;
  border-radius: var(--radius);
  padding: 40px 36px;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
  transition: transform 0.2s;
}
.impact-card:hover { transform: translateY(-4px); }

.impact-icon { font-size: 36px; margin-bottom: 16px; }
.impact-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 12px; }
.impact-card p { font-size: 15px; color: var(--text-muted); margin-bottom: 20px; line-height: 1.7; }
.impact-card ul { list-style: none; }
.impact-card ul li {
  font-size: 14px;
  padding: 6px 0;
  padding-left: 20px;
  position: relative;
  color: var(--text-muted);
}
.impact-card ul li::before {
  content: '✓';
  position: absolute;
  left: 0;
  font-weight: 700;
}

.impact-green { border-top: 4px solid var(--green); }
.impact-green ul li::before { color: var(--green); }
.impact-gold { border-top: 4px solid var(--gold); }
.impact-gold ul li::before { color: var(--gold); }
.impact-blue { border-top: 4px solid var(--blue); }
.impact-blue ul li::before { color: var(--blue); }

/* ===== FARMERS ===== */
.farmers { padding: 100px 24px; }

.farmers-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.farmers-text .section-label { display: block; }
.farmers-text h2 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(28px, 4vw, 42px);
  margin-bottom: 20px;
  line-height: 1.2;
}
.farmers-text > p {
  color: var(--text-muted);
  font-size: 16px;
  line-height: 1.8;
  margin-bottom: 28px;
}

.farmer-benefits { list-style: none; margin-bottom: 36px; }
.farmer-benefits li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  font-size: 15px;
  border-bottom: 1px solid var(--border);
}
.farmer-benefits li:last-child { border-bottom: none; }
.check {
  width: 24px;
  height: 24px;
  background: var(--green-light);
  color: var(--green);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}

.image-card {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border);
}
.image-placeholder {
  background: linear-gradient(135deg, var(--green-light), #d0ead8);
  height: 400px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 16px;
}
.big-emoji { font-size: 80px; }
.image-placeholder p { color: var(--text-muted); font-size: 15px; }

/* ===== JOIN ===== */
.join {
  background: linear-gradient(135deg, var(--green-dark) 0%, #1a3a28 100%);
  padding: 100px 24px;
  color: white;
  text-align: center;
}

.join-inner {
  max-width: 600px;
}

.join h2 {
  font-family: 'Playfair Display', serif;
  font-size: clamp(28px, 4vw, 42px);
  margin-bottom: 16px;
  color: white;
}
.join > .join-inner > p {
  color: rgba(255,255,255,0.75);
  font-size: 17px;
  margin-bottom: 40px;
}

.join-form {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.join-form input,
.join-form select {
  width: 100%;
  padding: 14px 18px;
  border-radius: 12px;
  border: 1.5px solid rgba(255,255,255,0.2);
  background: rgba(255,255,255,0.1);
  color: white;
  font-size: 15px;
  font-family: 'Inter', sans-serif;
  outline: none;
  transition: border-color 0.2s, background 0.2s;
}
.join-form input::placeholder { color: rgba(255,255,255,0.5); }
.join-form input:focus,
.join-form select:focus {
  border-color: rgba(255,255,255,0.6);
  background: rgba(255,255,255,0.15);
}
.join-form select option { background: var(--green-dark); color: white; }

.join-form .btn-primary {
  background: var(--gold);
  border-color: var(--gold);
  color: #1a1a00;
  font-size: 16px;
  margin-top: 8px;
}
.join-form .btn-primary:hover {
  background: #d4911a;
  border-color: #d4911a;
  box-shadow: 0 6px 20px rgba(232,160,32,0.4);
}

.join-success {
  text-align: center;
  padding: 48px 0;
}
.join-success .big-emoji { font-size: 64px; display: block; margin-bottom: 16px; }
.join-success h3 { font-size: 28px; margin-bottom: 12px; }
.join-success p { color: rgba(255,255,255,0.75); font-size: 16px; }

/* ===== FOOTER ===== */
footer {
  background: var(--text);
  color: white;
  padding: 64px 24px 0;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 48px;
  align-items: start;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand .logo { margin-bottom: 12px; }
.footer-brand .logo strong { color: #6fdb8e; }
.footer-brand p { font-size: 14px; color: rgba(255,255,255,0.5); line-height: 1.7; }

.footer-links {
  display: flex;
  gap: 64px;
}
.footer-links > div { display: flex; flex-direction: column; gap: 10px; }
.footer-links h4 {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: 4px;
}
.footer-links a {
  font-size: 14px;
  color: rgba(255,255,255,0.65);
  transition: color 0.2s;
}
.footer-links a:hover { color: white; }

.footer-bottom {
  padding: 20px 0;
  text-align: center;
}
.footer-bottom p {
  font-size: 13px;
  color: rgba(255,255,255,0.35);
}

/* ===== RESPONSIVE ===== */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: block; }

  .hero { padding: 64px 20px 56px; }

  .hero-stats { flex-direction: column; }
  .stat-div { width: 80%; height: 1px; }

  .steps { flex-direction: column; align-items: center; gap: 16px; }
  .step { max-width: 100%; }
  .step-arrow { transform: rotate(90deg); margin-top: 0; }

  .farmers-inner { grid-template-columns: 1fr; }
  .farmers-image { order: -1; }
  .image-placeholder { height: 260px; }

  .form-row { grid-template-columns: 1fr; }

  .footer-inner { grid-template-columns: 1fr; }
  .footer-links { flex-direction: column; gap: 32px; }

  .p-stats { flex-direction: column; }
  .p-stat-div { width: 80%; height: 1px; margin: 0 auto; }

  .pollution-health .container { grid-template-columns: 1fr; }
  .aqi-display { margin-top: 40px; }

  .bridge-arrow { transform: rotate(90deg); }
}

@media (max-width: 480px) {
  .hero-actions { flex-direction: column; align-items: center; }
  .btn { width: 100%; justify-content: center; }
}