:root {
  --bg: #f5fbf5;
  --surface: #ffffff;
  --primary: #2e7d32;
  --primary-soft: #dff3e0;
  --text: #1d2a1f;
  --muted: #5d6e60;
  --accent: #9ed69f;
  --radius: 16px;
  --shadow: 0 8px 24px rgba(26, 74, 35, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

.container {
  width: min(1100px, 92%);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 999;
  background: rgba(245, 251, 245, 0.95);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid #e2efe3;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 0;
}

.logo {
  font-weight: 800;
  color: var(--primary);
  text-decoration: none;
}

.site-nav ul {
  display: flex;
  list-style: none;
  gap: 1rem;
  margin: 0;
  padding: 0;
}

.site-nav a {
  color: var(--text);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
}

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

.nav-toggle {
  display: none;
  border: none;
  background: transparent;
  font-size: 1.5rem;
}

.hero {
  padding: 3rem 0;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 2rem;
  align-items: center;
}

h1,
h2,
h3 {
  line-height: 1.25;
}

h1 {
  font-size: clamp(1.8rem, 3.5vw, 3rem);
  margin-top: 0;
}

.btn {
  background: var(--primary);
  color: #fff;
  border: none;
  padding: 0.75rem 1.1rem;
  border-radius: 999px;
  font-weight: 700;
  text-decoration: none;
  display: inline-block;
  cursor: pointer;
}

.btn:hover {
  background: #1f6725;
}

.hero-illustration {
  position: relative;
  min-height: 260px;
  border-radius: var(--radius);
  background: linear-gradient(180deg, #e7f8ff 0%, #f1fff3 70%);
  overflow: hidden;
  border: 1px solid #dceedd;
}

.sun {
  position: absolute;
  width: 70px;
  aspect-ratio: 1;
  border-radius: 50%;
  background: #ffd97a;
  top: 20px;
  right: 30px;
}

.hill {
  position: absolute;
  width: 120%;
  left: -10%;
  border-radius: 50%;
}

.hill-1 {
  height: 180px;
  background: #b8e4b9;
  bottom: -85px;
}

.hill-2 {
  height: 130px;
  background: #8ece91;
  bottom: -70px;
}

.tree {
  position: absolute;
  width: 18px;
  height: 70px;
  background: #6b4423;
  bottom: 45px;
  left: 40%;
}

.tree::before {
  content: "";
  position: absolute;
  width: 80px;
  height: 80px;
  border-radius: 50%;
  background: #58a75e;
  left: -31px;
  top: -45px;
}

.section {
  padding: 2.5rem 0;
}

.section.alt {
  background: #eff9ef;
}

.card {
  background: var(--surface);
  border-radius: var(--radius);
  padding: 1rem;
  box-shadow: var(--shadow);
  border: 1px solid #e5f1e6;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
}

.form-grid {
  display: grid;
  gap: 1rem;
}

fieldset {
  border: 1px solid #dcebdd;
  border-radius: 12px;
  padding: 0.75rem;
}

legend {
  font-weight: 700;
  padding: 0 0.3rem;
}

label {
  display: grid;
  gap: 0.3rem;
  color: var(--muted);
}

input,
textarea {
  width: 100%;
  border: 1px solid #ccdccc;
  border-radius: 10px;
  padding: 0.65rem;
  font: inherit;
}

#eco-map {
  height: 380px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid #d8e8d9;
  box-shadow: var(--shadow);
}

.goal-row {
  display: grid;
  gap: 0.5rem;
}

progress {
  width: 100%;
  height: 16px;
}

.challenge-progress {
  margin-top: 1rem;
  font-weight: 700;
}

.hidden {
  display: none;
}

.site-footer {
  border-top: 1px solid #e0ece1;
  padding: 1rem 0;
  text-align: center;
  color: var(--muted);
}

@media (max-width: 900px) {
  .site-nav {
    display: none;
    position: absolute;
    top: 100%;
    right: 1rem;
    background: white;
    border: 1px solid #ddeadd;
    border-radius: 12px;
    box-shadow: var(--shadow);
    width: min(280px, 85vw);
    padding: 0.5rem;
  }

  .site-nav.open {
    display: block;
  }

  .site-nav ul {
    flex-direction: column;
    gap: 0.2rem;
  }

  .site-nav a {
    display: block;
    padding: 0.5rem;
  }

  .nav-toggle {
    display: block;
  }

  .hero-grid {
    grid-template-columns: 1fr;
  }
}