:root {
  --navy: #0B2C5F;
  --blue: #0066CC;
  --blue-light: #E8F1FC;
  --blue-hover: #0052A3;
  --gray: #6B7280;
  --gray-light: #F3F4F6;
  --white: #FFFFFF;
  --border: #D1D5DB;
  --dark: #1F2937;
  --red: #DC2626;
}

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

body {
  font-family: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
  color: var(--dark);
  background: var(--white);
  line-height: 1.7;
}

/* Anti-phishing disclaimer banner */
.disclaimer-banner {
  background: #FEF3C7;
  border-bottom: 2px solid #F59E0B;
  padding: 12px 20px;
  text-align: center;
  font-size: 0.875rem;
  color: #92400E;
  font-weight: 600;
}

.disclaimer-banner a { color: #92400E; text-decoration: underline; }

/* Header */
header {
  background: var(--navy);
  color: var(--white);
  padding: 20px 0;
  border-bottom: 4px solid var(--blue);
}

.header-inner {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

header h1 {
  font-size: 1.5rem;
  font-weight: 600;
}

header h1 span { color: var(--blue); }

/* Navigation */
nav {
  background: var(--navy);
  border-top: 1px solid rgba(255,255,255,0.1);
}

nav ul {
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 20px;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
}

nav ul li a {
  display: block;
  padding: 12px 16px;
  color: rgba(255,255,255,0.85);
  text-decoration: none;
  font-size: 0.875rem;
  transition: background 0.2s;
}

nav ul li a:hover, nav ul li a.active {
  background: var(--blue);
  color: var(--white);
}

/* Layout */
.container {
  max-width: 1140px;
  margin: 0 auto;
  padding: 30px 20px;
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 40px;
}

.main-content { min-width: 0; }

/* Sidebar */
.sidebar {
  position: sticky;
  top: 20px;
  align-self: start;
}

.sidebar-card {
  background: var(--blue-light);
  border: 1px solid #BFDBFE;
  border-radius: 8px;
  padding: 20px;
  margin-bottom: 20px;
}

.sidebar-card h3 {
  color: var(--navy);
  font-size: 1rem;
  margin-bottom: 12px;
}

.sidebar-card p {
  font-size: 0.875rem;
  color: var(--gray);
  margin-bottom: 8px;
}

.sidebar-card .no-login {
  background: #FEE2E2;
  border: 1px solid #FCA5A5;
  border-radius: 6px;
  padding: 12px;
  color: var(--red);
  font-weight: 600;
  font-size: 0.85rem;
  text-align: center;
  margin-top: 12px;
}

.sidebar-links {
  background: var(--gray-light);
  border-radius: 8px;
  padding: 20px;
}

.sidebar-links h3 {
  color: var(--navy);
  font-size: 1rem;
  margin-bottom: 12px;
}

.sidebar-links ul {
  list-style: none;
}

.sidebar-links ul li {
  margin-bottom: 8px;
}

.sidebar-links ul li a {
  color: var(--blue);
  text-decoration: none;
  font-size: 0.875rem;
}

.sidebar-links ul li a:hover { text-decoration: underline; }

/* Content styling */
.main-content h2 {
  color: var(--navy);
  font-size: 1.75rem;
  margin: 30px 0 15px;
  font-weight: 600;
}

.main-content h3 {
  color: var(--navy);
  font-size: 1.25rem;
  margin: 25px 0 10px;
  font-weight: 600;
}

.main-content p {
  margin-bottom: 15px;
  color: #374151;
}

.main-content ul, .main-content ol {
  margin: 0 0 15px 25px;
  color: #374151;
}

.main-content ul li, .main-content ol li {
  margin-bottom: 8px;
}

.main-content a {
  color: var(--blue);
  text-decoration: none;
}

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

/* Hero section */
.hero {
  background: linear-gradient(135deg, var(--navy) 0%, #134A8E 100%);
  color: var(--white);
  padding: 50px 20px;
  text-align: center;
}

.hero h2 {
  color: var(--white);
  font-size: 2rem;
  margin-bottom: 15px;
}

.hero p {
  color: rgba(255,255,255,0.9);
  max-width: 700px;
  margin: 0 auto 20px;
  font-size: 1.05rem;
}

.hero .official-btn {
  display: inline-block;
  background: var(--blue);
  color: var(--white);
  padding: 12px 30px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.95rem;
  transition: background 0.2s;
}

.hero .official-btn:hover { background: var(--blue-hover); }

/* Info cards */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 20px;
  margin: 30px 0;
}

.card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
  text-align: center;
  transition: box-shadow 0.2s;
}

.card:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.08); }

.card .card-icon {
  width: 48px;
  height: 48px;
  background: var(--blue-light);
  border-radius: 50%;
  margin: 0 auto 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
}

.card h3 {
  color: var(--navy);
  font-size: 1.1rem;
  margin-bottom: 10px;
}

.card p {
  font-size: 0.9rem;
  color: var(--gray);
}

.card .card-link {
  display: inline-block;
  margin-top: 12px;
  color: var(--blue);
  text-decoration: none;
  font-size: 0.875rem;
  font-weight: 600;
}

/* Buttons */
.btn-howto {
  display: inline-block;
  background: var(--navy);
  color: var(--white);
  padding: 10px 24px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  margin: 5px;
  transition: background 0.2s;
}

.btn-howto:hover { background: var(--blue); }

.btn-official {
  display: inline-block;
  background: var(--blue);
  color: var(--white);
  padding: 12px 28px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  margin: 15px 0;
}

.btn-official:hover { background: var(--blue-hover); }

/* Notice box */
.notice {
  background: var(--blue-light);
  border-left: 4px solid var(--blue);
  padding: 16px 20px;
  border-radius: 0 8px 8px 0;
  margin: 20px 0;
}

.notice strong { color: var(--navy); }

/* Table */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

table th {
  background: var(--navy);
  color: var(--white);
  padding: 12px;
  text-align: left;
  font-size: 0.875rem;
}

table td {
  padding: 12px;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
}

table tr:nth-child(even) { background: var(--gray-light); }

/* Footer */
footer {
  background: var(--navy);
  color: rgba(255,255,255,0.7);
  padding: 30px 20px;
  text-align: center;
  font-size: 0.85rem;
}

footer a {
  color: rgba(255,255,255,0.7);
  margin: 0 10px;
  text-decoration: none;
}

footer a:hover { color: var(--white); }

footer .footer-disclaimer {
  max-width: 700px;
  margin: 0 auto 15px;
  font-size: 0.8rem;
  line-height: 1.5;
}

/* Breadcrumbs */
.breadcrumbs {
  font-size: 0.8rem;
  color: var(--gray);
  margin-bottom: 20px;
}

.breadcrumbs a {
  color: var(--blue);
  text-decoration: none;
}

/* Responsive */
@media (max-width: 768px) {
  .container { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .header-inner { flex-direction: column; gap: 10px; }
  nav ul { flex-direction: column; }
  .hero h2 { font-size: 1.5rem; }
}