:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --text: #172033;
  --muted: #5f6b7a;
  --line: #dbe3ef;
  --brand: #2457d6;
  --brand-dark: #1b3f9e;
  --warning-bg: #fff8e5;
  --warning-line: #ead18a;
  --danger-bg: #fff0f0;
  --danger-line: #f0b8b8;
  --shadow: 0 12px 32px rgba(20, 35, 70, 0.08);
  --radius: 16px;
}

* {
  box-sizing: border-box;
}

html {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.7;
}

body {
  margin: 0;
}

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

a:hover {
  color: var(--brand-dark);
  text-decoration: underline;
}

.site-header {
  background: var(--panel);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 20px;
}

.site-title {
  margin: 0;
  font-size: 22px;
  line-height: 1.4;
}

.site-title a {
  color: var(--text);
}

.site-description {
  margin: 6px 0 0;
  color: var(--muted);
  font-size: 14px;
}

.nav {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 20px 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.nav a {
  display: inline-block;
  padding: 7px 11px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #ffffff;
  color: var(--text);
  font-size: 14px;
}

.nav a:hover {
  border-color: var(--brand);
  color: var(--brand);
  text-decoration: none;
}

.main {
  max-width: 1080px;
  margin: 0 auto;
  padding: 28px 20px 44px;
}

.hero {
  padding: 28px;
  background: linear-gradient(135deg, #ffffff, #edf3ff);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero h1 {
  margin: 0 0 12px;
  font-size: 30px;
  line-height: 1.4;
}

.hero p {
  margin: 0 0 12px;
}

.section {
  margin-top: 26px;
  padding: 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.section h2 {
  margin: 0 0 14px;
  font-size: 22px;
}

.section h3 {
  margin: 20px 0 8px;
  font-size: 18px;
}

.notice {
  margin-top: 18px;
  padding: 14px 16px;
  border: 1px solid var(--warning-line);
  border-radius: 12px;
  background: var(--warning-bg);
  color: #5d4a12;
}

.error {
  margin-top: 18px;
  padding: 14px 16px;
  border: 1px solid var(--danger-line);
  border-radius: 12px;
  background: var(--danger-bg);
  color: #7a2020;
}

.card-list {
  display: grid;
  gap: 14px;
}

.update-card,
.carrier-card {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #ffffff;
}

.update-card h3,
.carrier-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 8px 0 0;
  color: var(--muted);
  font-size: 13px;
}

.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 999px;
  background: #eef3ff;
  color: #21418f;
  font-size: 12px;
}

.badge-high {
  background: #fff0f0;
  color: #9b1c1c;
}

.badge-medium {
  background: #fff8e5;
  color: #755510;
}

.badge-low {
  background: #edf7ed;
  color: #22642a;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 14px;
}

.button-row {
  margin-top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.button {
  display: inline-block;
  padding: 9px 13px;
  border-radius: 10px;
  background: var(--brand);
  color: #ffffff;
  font-weight: 600;
}

.button:hover {
  background: var(--brand-dark);
  color: #ffffff;
  text-decoration: none;
}

.footer {
  border-top: 1px solid var(--line);
  background: #ffffff;
}

.footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 20px;
  color: var(--muted);
  font-size: 13px;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

@media (max-width: 640px) {
  .hero {
    padding: 22px;
  }

  .hero h1 {
    font-size: 24px;
  }

  .section {
    padding: 20px;
  }

  .nav {
    gap: 8px;
  }
}