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

:root {
  --green-500: #34c759;
  --green-600: #28a745;
  --green-50: #f0fdf4;
  --gray-50: #f9fafb;
  --gray-100: #f2f2f7;
  --gray-200: #e5e5ea;
  --gray-400: #aeaeb2;
  --gray-500: #8e8e93;
  --gray-600: #636366;
  --gray-700: #48484a;
  --gray-800: #2c2c2e;
  --gray-900: #1c1c1e;
  --bg: #ffffff;
  --bg-secondary: #f2f2f7;
  --text-primary: #1c1c1e;
  --text-secondary: #636366;
  --card-bg: #ffffff;
  --card-border: rgba(0, 0, 0, 0.06);
  --table-header-bg: #f2f2f7;
  --divider: rgba(0, 0, 0, 0.08);
  --radius: 16px;
  --radius-sm: 12px;
  --max-width: 720px;
  --transition: 0.3s cubic-bezier(0.25, 0.1, 0.25, 1);
}

@media (prefers-color-scheme: dark) {
  :root {
    --green-50: rgba(52, 199, 89, 0.1);
    --gray-50: #1c1c1e;
    --gray-100: #2c2c2e;
    --bg: #000000;
    --bg-secondary: #1c1c1e;
    --text-primary: #f5f5f7;
    --text-secondary: #aeaeb2;
    --card-bg: #1c1c1e;
    --card-border: rgba(255, 255, 255, 0.08);
    --table-header-bg: #2c2c2e;
    --divider: rgba(255, 255, 255, 0.08);
  }
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family:
    -apple-system, BlinkMacSystemFont, 'SF Pro Text', 'SF Pro Display',
    'Helvetica Neue', Arial, sans-serif;
  background: var(--bg);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Header ── */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.72);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 0.5px solid var(--divider);
}

@media (prefers-color-scheme: dark) {
  header {
    background: rgba(0, 0, 0, 0.72);
  }
}

nav {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 12px 24px;
  display: flex;
  align-items: center;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 17px;
  letter-spacing: -0.02em;
}

.logo img {
  border-radius: 10px;
}

/* ── Hero ── */
.hero {
  text-align: center;
  padding: 64px 24px 32px;
  max-width: var(--max-width);
  margin: 0 auto;
}

.hero h1 {
  font-size: 48px;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.1;
  background: linear-gradient(135deg, var(--green-500), #2db44d);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.subtitle {
  margin-top: 12px;
  font-size: 17px;
  color: var(--text-secondary);
}

/* ── Content ── */
.content {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px 80px;
}

.content section {
  margin-top: 48px;
}

.content section:first-child {
  margin-top: 16px;
}

.content h2 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.content p {
  font-size: 17px;
  color: var(--text-secondary);
  margin-bottom: 12px;
  line-height: 1.7;
}

.content p:last-child {
  margin-bottom: 0;
}

.content ul {
  list-style: none;
  padding: 0;
  margin: 12px 0;
}

.content ul li {
  position: relative;
  padding-left: 20px;
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 6px;
}

.content ul li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 11px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--green-500);
}

.content strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* ── Cards ── */
.card-group {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 20px;
}

@media (max-width: 600px) {
  .card-group {
    grid-template-columns: 1fr;
  }
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px;
  transition:
    transform var(--transition),
    box-shadow var(--transition);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
}

@media (prefers-color-scheme: dark) {
  .card:hover {
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.3);
  }
}

.card h3 {
  font-size: 17px;
  font-weight: 600;
  margin-bottom: 12px;
  color: var(--green-500);
}

.card ul {
  margin: 0;
}

.card-note {
  margin-top: 16px;
  font-size: 14px !important;
  color: var(--gray-500) !important;
  line-height: 1.5 !important;
}

/* ── Table ── */
.table-wrapper {
  margin-top: 20px;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--card-border);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

thead {
  background: var(--table-header-bg);
}

th {
  text-align: left;
  padding: 12px 16px;
  font-weight: 600;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text-secondary);
}

td {
  padding: 14px 16px;
  color: var(--text-secondary);
  border-top: 1px solid var(--divider);
}

tr:first-child td {
  border-top: none;
}

/* ── Links ── */
.link {
  color: var(--green-500);
  text-decoration: none;
  font-weight: 500;
  transition: opacity var(--transition);
}

.link:hover {
  opacity: 0.7;
}

/* ── Footer ── */
footer {
  border-top: 1px solid var(--divider);
  padding: 40px 24px;
  text-align: center;
}

.footer-content {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}

.footer-icon {
  border-radius: 8px;
}

.footer-content p {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
}

.copyright {
  font-size: 13px !important;
  font-weight: 400 !important;
  color: var(--text-secondary) !important;
}

/* ── Animations ── */
.fade-in {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity 0.6s ease,
    transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ── Responsive ── */
@media (max-width: 600px) {
  .hero {
    padding: 48px 20px 24px;
  }

  .hero h1 {
    font-size: 34px;
  }

  .content {
    padding: 0 20px 60px;
  }

  .content h2 {
    font-size: 24px;
  }

  .content section {
    margin-top: 36px;
  }

  .card {
    padding: 20px;
  }

  th,
  td {
    padding: 10px 12px;
    font-size: 14px;
  }
}