:root {
  --primary: #2563eb;
  --accent: #ef4444;
  --bg: #ffffff;
  --section-bg: #f3f4f6;
  --text: #1f2937;
  --muted: #6b7280;
  --border: #e5e7eb;
  --shadow: 0 8px 24px rgba(31, 41, 55, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.75;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.site-header {
  background: var(--primary);
  color: #ffffff;
  text-align: center;
  padding: 2.4rem 1rem;
}

.site-header h1 {
  margin: 0;
  font-size: clamp(1.7rem, 4vw, 2.35rem);
  letter-spacing: 0.2px;
}

.site-header p {
  margin: 0.35rem 0 0;
  opacity: 0.95;
}

.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem;
  padding: 0.7rem;
  background: var(--primary);
  border-bottom: 1px solid #1d4ed8;
}

.navbar a {
  color: #e2e8f0;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.1px;
  padding: 0.48rem 0.85rem;
  border-radius: 999px;
  transition: background-color 0.2s ease, color 0.2s ease, transform 0.2s ease;
}

.navbar a:hover {
  background: var(--accent);
  color: #ffffff;
  transform: translateY(-1px);
}

.navbar a.active {
  background: var(--accent);
  color: #ffffff;
}

.container {
  width: 100%;
  max-width: 1020px;
  margin: 1.4rem auto 1.6rem;
  padding: 0 1rem;
  flex: 1;
}

.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: clamp(1rem, 2vw, 1.6rem);
  margin-bottom: 1.1rem;
  box-shadow: var(--shadow);
}

h2,
h3,
h4 {
  color: var(--text);
  margin-top: 0.2rem;
}

h2 {
  font-size: 1.45rem;
  margin-bottom: 0.4rem;
}

h3 {
  font-size: 1.18rem;
  margin-bottom: 0.55rem;
}

h4 {
  font-size: 1rem;
  margin-bottom: 0.35rem;
}

p {
  margin: 0.6rem 0;
}

ul,
ol {
  padding-left: 1.35rem;
  margin: 0.45rem 0 0.8rem;
}

li {
  margin-bottom: 0.33rem;
  color: var(--muted);
}

strong {
  color: var(--text);
}

a {
  color: #1d4ed8;
}

a:hover {
  color: #1e3a8a;
}

a:focus-visible {
  outline: 3px solid #93c5fd;
  outline-offset: 2px;
  border-radius: 6px;
}

.cover-banner {
  display: flex;
  align-items: center;
  gap: 1rem;
  background: var(--section-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  margin: 0.8rem 0 1rem;
}

.cover-icon {
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--primary);
  position: relative;
  flex-shrink: 0;
}

.cover-icon::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 13px;
  width: 21px;
  height: 32px;
  border: 2px solid #ffffff;
  border-top-left-radius: 2px;
  border-top-right-radius: 2px;
  border-bottom-left-radius: 8px;
  border-bottom-right-radius: 8px;
}

.cover-banner h4 {
  margin: 0 0 0.2rem;
}

.cover-banner p {
  margin: 0;
  color: var(--muted);
}

.chart-wrapper {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1rem;
  margin-top: 0.9rem;
}

.chart-note {
  margin-top: 0.8rem;
  color: var(--muted);
}

.site-footer {
  text-align: center;
  padding: 1rem;
  background: var(--text);
  color: #ffffff;
  font-size: 0.94rem;
}

.card.alt {
  background: var(--section-bg);
}

.section-title-blue {
  color: var(--primary);
}

.important-note {
  border-left: 4px solid var(--accent);
  padding-left: 0.75rem;
  color: var(--text);
  font-weight: 600;
}

.badge {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.2px;
  text-transform: uppercase;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  margin-bottom: 0.45rem;
}

.badge-blue {
  background: rgba(37, 99, 235, 0.12);
  color: var(--primary);
  border: 1px solid rgba(37, 99, 235, 0.3);
}

.badge-red {
  background: rgba(239, 68, 68, 0.12);
  color: var(--accent);
  border: 1px solid rgba(239, 68, 68, 0.3);
}

@media (max-width: 780px) {
  .navbar {
    justify-content: flex-start;
    overflow-x: auto;
    white-space: nowrap;
    padding-inline: 0.9rem;
  }

  .navbar a {
    flex: 0 0 auto;
  }
}

@media (max-width: 600px) {
  body {
    line-height: 1.65;
  }

  .site-header {
    padding: 1.9rem 0.9rem;
  }

  .cover-banner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media print {
  body {
    background: #ffffff;
    color: var(--text);
    line-height: 1.5;
  }

  .site-header,
  .site-footer,
  .navbar {
    background: #ffffff;
    color: var(--text);
    box-shadow: none;
    border: 0;
  }

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

  .card,
  .chart-wrapper,
  .cover-banner {
    box-shadow: none;
    border: 1px solid #d1d5db;
  }
}