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

:root {
  --green: #339461;
  --green-light: #5BB680;
  --green-dark: #1F8073;
  --gradient-start: #2EA68C;
  --gradient-end: #1F8073;
  --text: #1a1a1a;
  --text-secondary: #555;
  --bg: #fff;
  --bg-alt: #f7faf8;
  --border: #e0e8e3;
  --radius: 12px;
}

html {
  font-size: 16px;
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
}

/* Navbar */
.navbar {
  position: sticky;
  top: 0;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  z-index: 100;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--green);
  text-decoration: none;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.95rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--green);
}

/* Hero */
.hero {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff;
  padding: 100px 0 80px;
  text-align: center;
}

.hero h1 {
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  margin-bottom: 8px;
}

.hero-subtitle {
  font-size: 1.35rem;
  font-weight: 500;
  opacity: 0.9;
  margin-bottom: 20px;
}

.hero-description {
  font-size: 1.1rem;
  max-width: 540px;
  margin: 0 auto 36px;
  opacity: 0.85;
  line-height: 1.7;
}

.app-store-badge img {
  height: 54px;
  transition: opacity 0.2s;
}

.app-store-badge:hover img {
  opacity: 0.85;
}

/* Callout */
.callout {
  background: var(--bg-alt);
  text-align: center;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
}

.callout p {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--green);
}

/* Features */
.features {
  padding: 80px 0;
}

.features h2 {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 48px;
  letter-spacing: -0.02em;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.feature-card {
  background: var(--bg-alt);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
}

.feature-icon {
  width: 44px;
  height: 44px;
  color: var(--green);
  margin-bottom: 16px;
}

.feature-icon svg {
  width: 100%;
  height: 100%;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 650;
  margin-bottom: 8px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Platforms */
.platforms {
  background: var(--bg-alt);
  padding: 60px 0;
  text-align: center;
  border-top: 1px solid var(--border);
}

.platforms h2 {
  font-size: 1.6rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.platforms p {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

/* Page Header */
.page-header {
  background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
  color: #fff;
  padding: 60px 0 48px;
  text-align: center;
}

.page-header h1 {
  font-size: 2.4rem;
  font-weight: 800;
  margin-bottom: 8px;
}

.page-header p {
  opacity: 0.85;
  font-size: 1.05rem;
  max-width: 480px;
  margin: 0 auto;
}

/* Contact Form */
.contact-section {
  padding: 60px 0 80px;
}

.contact-form {
  max-width: 560px;
  margin: 0 auto;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 6px;
  color: var(--text);
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: 1rem;
  font-family: inherit;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--text);
  transition: border-color 0.2s, box-shadow 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--green);
  box-shadow: 0 0 0 3px rgba(51, 148, 97, 0.12);
}

.form-group textarea {
  resize: vertical;
  min-height: 120px;
}

.contact-form button[type="submit"] {
  width: 100%;
  padding: 14px;
  font-size: 1rem;
  font-weight: 600;
  font-family: inherit;
  color: #fff;
  background: var(--green);
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: background 0.2s;
}

.contact-form button[type="submit"]:hover {
  background: var(--green-dark);
}

.contact-form button[type="submit"]:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.form-feedback {
  margin-bottom: 16px;
  padding: 0;
  font-size: 0.95rem;
  border-radius: 8px;
}

.form-feedback.success {
  background: #eaf7ef;
  color: #1a6b3a;
  padding: 12px 16px;
}

.form-feedback.error {
  background: #fdecea;
  color: #a33;
  padding: 12px 16px;
}

/* Content Pages (Privacy) */
.content-section {
  padding: 60px 0 80px;
}

.content-narrow {
  max-width: 720px;
}

.content-narrow h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin-top: 36px;
  margin-bottom: 12px;
  color: var(--text);
}

.content-narrow h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin-top: 24px;
  margin-bottom: 8px;
}

.content-narrow p {
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.content-narrow ul {
  color: var(--text-secondary);
  margin-bottom: 12px;
  padding-left: 24px;
}

.content-narrow li {
  margin-bottom: 6px;
}

.content-narrow a {
  color: var(--green);
  text-decoration: none;
}

.content-narrow a:hover {
  text-decoration: underline;
}

/* Footer */
.footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
}

.footer-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--green);
}

.footer-copy {
  color: var(--text-secondary);
  font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 768px) {
  .hero {
    padding: 72px 0 56px;
  }

  .hero h1 {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.15rem;
  }

  .feature-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .features {
    padding: 56px 0;
  }

  .footer-content {
    flex-direction: column;
    gap: 12px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 2rem;
  }

  .page-header h1 {
    font-size: 1.8rem;
  }
}