/* VietHoo Modern Clean CSS */
:root {
  --primary-color: #0033aa;
  --primary-dark: #001f66;
  --accent-color: #c0392b;
  --text-color: #222222;
  --text-muted: #666666;
  --bg-color: #f7fafc;
  --card-bg: #ffffff;
  --border-color: #e2e8f0;
}

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

body {
  margin: 0;
  padding: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text-color);
  background-color: var(--bg-color);
  line-height: 1.6;
}

.site-wrapper {
  max-width: 960px;
  margin: 20px auto;
  padding: 24px 32px;
  background: var(--card-bg);
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

/* Header */
.site-header {
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 20px;
  margin-bottom: 24px;
}

.header-banner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 20px;
}

.banner-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.banner-tagline {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--primary-dark);
  line-height: 1.3;
}

.header-logo, .header-gate-img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
}

.site-title {
  text-align: center;
  font-size: 2.2rem;
  margin: 10px 0 4px 0;
}

.site-title a {
  color: var(--accent-color);
  text-decoration: none;
}

.site-title a:hover {
  text-decoration: underline;
}

.site-subtitle {
  text-align: center;
  color: var(--text-muted);
  font-size: 1rem;
  margin: 0 0 16px 0;
}

/* AdSense */
.adsense-container {
  max-width: 100%;
  min-height: 90px;
  contain: layout;
  overflow: hidden;
  margin: 16px auto;
  text-align: center;
}

/* Search Box */
.search-box {
  display: flex;
  justify-content: center;
  margin: 16px 0;
}

.search-box form {
  display: flex;
  gap: 8px;
  width: 100%;
  max-width: 480px;
}

.search-box input[type="text"] {
  flex: 1;
  padding: 10px 14px;
  font-size: 1rem;
  border: 1px solid var(--border-color);
  border-radius: 4px;
}

.search-box button {
  padding: 10px 20px;
  background-color: var(--primary-color);
  color: #ffffff;
  border: none;
  border-radius: 4px;
  font-weight: 600;
  cursor: pointer;
  transition: background-color 0.2s ease;
}

.search-box button:hover {
  background-color: var(--primary-dark);
}

/* Breadcrumbs */
.breadcrumb-nav {
  background-color: #f1f5f9;
  padding: 8px 14px;
  border-radius: 4px;
  font-size: 0.95rem;
  margin-top: 14px;
}

.breadcrumb-nav a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 600;
}

.breadcrumb-nav a:hover {
  text-decoration: underline;
}

/* Alerts */
.alert-message {
  background-color: #e0f2fe;
  color: #0369a1;
  padding: 12px 16px;
  border-radius: 4px;
  border-left: 4px solid #0284c7;
  margin: 16px 0;
  font-weight: 500;
}

/* Categories Grid */
.section-heading {
  font-size: 1.35rem;
  color: var(--primary-dark);
  border-bottom: 2px solid var(--border-color);
  padding-bottom: 8px;
  margin: 24px 0 16px 0;
}

.categories-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
  margin-bottom: 24px;
}

.category-card {
  background-color: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: 6px;
  padding: 12px 16px;
  transition: transform 0.15s ease, background-color 0.15s ease;
}

.category-card:hover {
  transform: translateY(-2px);
  background-color: #f1f5f9;
}

.category-card a {
  color: var(--primary-color);
  text-decoration: none;
  display: block;
}

/* Links Section */
.links-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
}

.suggest-btn {
  background-color: #10b981;
  color: #ffffff;
  padding: 8px 14px;
  border-radius: 4px;
  text-decoration: none;
  font-weight: 600;
  font-size: 0.9rem;
  transition: background-color 0.15s ease;
}

.suggest-btn:hover {
  background-color: #059669;
}

.link-list {
  list-style: none;
  padding: 0;
  margin: 16px 0;
}

.link-item {
  border-bottom: 1px solid var(--border-color);
  padding: 14px 0;
}

.link-item:last-child {
  border-bottom: none;
}

.link-title {
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--primary-color);
  text-decoration: none;
}

.link-title:hover {
  text-decoration: underline;
}

.link-url {
  display: block;
  font-size: 0.85rem;
  color: var(--text-muted);
  word-break: break-all;
  margin: 2px 0 6px 0;
}

.link-desc {
  margin: 0;
  color: #334155;
}

.link-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 6px;
}

.empty-state {
  color: var(--text-muted);
  font-style: italic;
  padding: 20px 0;
}

/* Suggest Form */
.suggest-form {
  background-color: #f8fafc;
  border: 1px solid var(--border-color);
  border-radius: 8px;
  padding: 24px;
  margin: 20px 0;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 6px;
}

.form-group input, .form-group textarea {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border-color);
  border-radius: 4px;
  font-size: 0.95rem;
  font-family: inherit;
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.required {
  color: #dc2626;
}

.form-actions {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-top: 20px;
}

.submit-btn {
  background-color: var(--primary-color);
  color: #ffffff;
  padding: 10px 20px;
  border: none;
  border-radius: 4px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
}

.submit-btn:hover {
  background-color: var(--primary-dark);
}

.cancel-link {
  color: var(--text-muted);
  text-decoration: none;
}

.cancel-link:hover {
  text-decoration: underline;
}

/* Footer */
.site-footer {
  margin-top: 40px;
  text-align: center;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.footer-links {
  margin-bottom: 8px;
}

.footer-links a {
  color: var(--primary-color);
  text-decoration: none;
}

.footer-links a:hover {
  text-decoration: underline;
}

@media (max-width: 640px) {
  .site-wrapper {
    margin: 8px;
    padding: 16px;
  }
  .form-row {
    grid-template-columns: 1fr;
  }
  .header-banner {
    flex-direction: column;
    text-align: center;
  }
  .banner-left {
    flex-direction: column;
  }
}