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

:root {
  --green-900: #1a2e0a;
  --green-800: #2d5016;
  --green-700: #3d6b1e;
  --green-600: #4a7f26;
  --green-100: #e8f5d8;
  --green-50: #f4faec;
  --neutral-900: #1a1a1a;
  --neutral-700: #4a4a4a;
  --neutral-500: #7a7a7a;
  --neutral-300: #c0c0c0;
  --neutral-100: #f0f0f0;
  --neutral-50: #fafafa;
  --warm-50: #fefcf8;
  --warm-100: #fdf6e9;
  --warm-200: #fbecc8;
  --radius: 12px;
  --radius-sm: 8px;
  --max-w: 960px;
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Helvetica Neue", "PingFang SC", "Noto Sans SC", sans-serif;
  color: var(--neutral-900);
  background: var(--warm-50);
  line-height: 1.7;
}

/* --- Nav --- */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(254, 252, 248, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.nav-inner {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--green-800);
  text-decoration: none;
  letter-spacing: 0.02em;
}

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

.nav-links a {
  font-size: 0.875rem;
  color: var(--neutral-500);
  text-decoration: none;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--green-700);
}

/* --- Hero --- */
.hero {
  padding: 100px 24px 80px;
  text-align: center;
  background: linear-gradient(180deg, var(--warm-50) 0%, var(--green-50) 100%);
}

.hero-inner {
  max-width: 600px;
  margin: 0 auto;
}

.hero-overline {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--green-600);
  margin-bottom: 12px;
}

.hero h1 {
  font-size: 3rem;
  font-weight: 700;
  color: var(--green-900);
  letter-spacing: 0.04em;
  margin-bottom: 20px;
}

.hero-sub {
  font-size: 1.15rem;
  color: var(--neutral-700);
  line-height: 1.8;
  margin-bottom: 36px;
}

.btn {
  display: inline-block;
  padding: 14px 32px;
  border-radius: 100px;
  font-size: 0.95rem;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.25s;
}

.btn-primary {
  background: var(--green-800);
  color: #fff;
}

.btn-primary:hover {
  background: var(--green-700);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(45, 80, 22, 0.25);
}

/* --- Features --- */
.features {
  padding: 80px 24px;
  background: #fff;
}

.features-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.features h2 {
  text-align: center;
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--green-900);
  margin-bottom: 48px;
}

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

.feature-card {
  padding: 28px 24px;
  border-radius: var(--radius);
  background: var(--warm-50);
  border: 1px solid rgba(0, 0, 0, 0.04);
}

.feature-icon {
  font-size: 1.8rem;
  margin-bottom: 12px;
}

.feature-card h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--neutral-900);
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--neutral-700);
  line-height: 1.65;
}

/* --- How --- */
.how {
  padding: 80px 24px;
  background: var(--green-50);
}

.how-inner {
  max-width: 680px;
  margin: 0 auto;
}

.how h2 {
  text-align: center;
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--green-900);
  margin-bottom: 48px;
}

.steps {
  display: flex;
  flex-direction: column;
  gap: 36px;
}

.step {
  display: flex;
  gap: 20px;
  align-items: flex-start;
}

.step-num {
  flex-shrink: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--green-800);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.95rem;
  font-weight: 600;
}

.step-body h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--neutral-900);
  margin-bottom: 4px;
}

.step-body p {
  font-size: 0.9rem;
  color: var(--neutral-700);
  line-height: 1.65;
}

/* --- Disclaimer --- */
.disclaimer-section {
  padding: 60px 24px;
  background: var(--warm-100);
}

.disclaimer-inner {
  max-width: 680px;
  margin: 0 auto;
  text-align: center;
}

.disclaimer-inner h3 {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--neutral-700);
  margin-bottom: 8px;
}

.disclaimer-inner p {
  font-size: 0.85rem;
  color: var(--neutral-500);
  line-height: 1.7;
}

/* --- Footer --- */
.footer {
  padding: 48px 24px 36px;
  background: var(--green-900);
  color: rgba(255, 255, 255, 0.7);
}

.footer-inner {
  max-width: var(--max-w);
  margin: 0 auto;
}

.footer-brand {
  margin-bottom: 20px;
}

.footer-name {
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
}

.footer-tagline {
  font-size: 0.8rem;
  margin-top: 2px;
  color: rgba(255, 255, 255, 0.5);
}

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

.footer-links a {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: #fff;
}

.footer-copy {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.35);
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* --- Content pages (privacy, support) --- */
.page-header {
  padding: 80px 24px 40px;
  background: linear-gradient(180deg, var(--warm-50) 0%, #fff 100%);
  text-align: center;
}

.page-header h1 {
  font-size: 2rem;
  font-weight: 600;
  color: var(--green-900);
}

.page-header .page-date {
  font-size: 0.8rem;
  color: var(--neutral-500);
  margin-top: 8px;
}

.page-content {
  max-width: 680px;
  margin: 0 auto;
  padding: 40px 24px 80px;
}

.page-content h2 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--neutral-900);
  margin: 40px 0 12px;
}

.page-content h3 {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--neutral-900);
  margin: 28px 0 8px;
}

.page-content p {
  font-size: 0.95rem;
  color: var(--neutral-700);
  line-height: 1.8;
  margin-bottom: 16px;
}

.page-content ul {
  margin: 12px 0 20px 20px;
}

.page-content li {
  font-size: 0.95rem;
  color: var(--neutral-700);
  line-height: 1.8;
  margin-bottom: 4px;
}

/* --- FAQ (support page) --- */
.faq-item {
  margin-bottom: 32px;
}

.faq-item h3 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--neutral-900);
  margin-bottom: 6px;
}

.faq-item p {
  font-size: 0.9rem;
  color: var(--neutral-700);
}

/* --- Responsive --- */
@media (max-width: 768px) {
  .feature-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .hero h1 {
    font-size: 2.2rem;
  }

  .hero-sub {
    font-size: 1rem;
  }

  .hero {
    padding: 72px 24px 56px;
  }

  .nav-links {
    gap: 16px;
  }

  .footer-links {
    flex-wrap: wrap;
    gap: 16px;
  }
}

@media (max-width: 480px) {
  .hero h1 {
    font-size: 1.8rem;
  }

  .nav-links a {
    font-size: 0.8rem;
  }
}