:root {
  --green: #245c42;
  --light: #f4f5e9;
  --lime: #d9ef9b;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: var(--light);
  color: #20372b;
}

header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 6%;
  background: #fffef8;
}

.logo {
  font-size: 22px;
  font-weight: bold;
  color: var(--green);
}

.logo span {
  color: #8cae4f;
}

nav {
  display: flex;
  gap: 18px;
}

nav a {
  text-decoration: none;
  color: var(--green);
}

main {
  max-width: 1050px;
  padding: 25px 20px;
  margin: auto;
}

.hero {
  background: var(--green);
  color: white;
  padding: 40px;
  border-radius: 24px;
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 20px;
  align-items: center;
}

.tag {
  color: var(--lime);
  letter-spacing: 2px;
  font-size: 12px;
  font-weight: bold;
}

h1 {
  font-size: clamp(38px, 6vw, 60px);
  line-height: 1.05;
}

.hero p {
  line-height: 1.7;
}

.nature {
  font-size: 75px;
  text-align: center;
  padding: 35px 10px;
  background: linear-gradient(#c9df9b, #69966a);
  border-radius: 20px;
}

section {
  margin: 30px 0;
}

h2 {
  font-size: 25px;
}

.panel {
  padding: 25px;
  background: #fffef8;
  border: 1px solid #e1e6d7;
  border-radius: 18px;
}

label {
  display: block;
  margin: 15px 0 7px;
  font-weight: bold;
}

input, select {
  width: 100%;
  padding: 12px;
  border: 1px solid #d5ddce;
  border-radius: 9px;
  font-size: 15px;
  background: white;
}

button {
  padding: 13px 18px;
  border: 0;
  border-radius: 10px;
  background: var(--lime);
  color: #20372b;
  font-weight: bold;
  cursor: pointer;
  margin-top: 15px;
}

button:hover {
  opacity: .85;
}

#generateBtn {
  background: var(--green);
  color: white;
  width: 100%;
}

#aiStatus {
  color: #68786a;
  font-size: 13px;
  margin-top: 18px;
}

#aiResult {
  white-space: pre-wrap;
  line-height: 1.8;
  margin-top: 12px;
}

.challenge {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding: 15px;
  margin: 10px 0;
  background: #fffef8;
  border-radius: 14px;
}

.challenge p {
  font-size: 13px;
  color: #68786a;
}

.challenge button {
  flex-shrink: 0;
}

.completed {
  opacity: .7;
}

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.stats strong {
  display: block;
  font-size: 25px;
  margin-top: 8px;
}

.track {
  background: #e3e8dc;
  height: 9px;
  border-radius: 20px;
  overflow: hidden;
  margin-top: 22px;
}

#progressBar {
  height: 100%;
  width: 0%;
  background: #79a854;
  transition: width .3s;
}

footer {
  text-align: center;
  padding: 25px;
  color: #68786a;
}

@media(max-width: 650px) {
  .hero {
    grid-template-columns: 1fr;
    padding: 25px;
  }

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

  nav {
    gap: 10px;
  }

  nav a {
    font-size: 12px;
  }
}