/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --primary: #1a56db;
  --primary-dark: #1340a8;
  --primary-light: #e8effc;
  --accent: #0ea5e9;
  --success: #10b981;
  --warning: #f59e0b;
  --danger: #ef4444;
  --dark: #111827;
  --gray-900: #1f2937;
  --gray-700: #374151;
  --gray-500: #6b7280;
  --gray-300: #d1d5db;
  --gray-100: #f3f4f6;
  --white: #ffffff;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --radius: 8px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.06);
  --shadow: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 32px rgba(0,0,0,0.12);
  --max-width: 1200px;
  --transition: 0.2s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  color: var(--gray-900);
  line-height: 1.6;
  background: var(--white);
  -webkit-font-smoothing: antialiased;
}

a { color: var(--primary); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--primary-dark); }

img { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4, h5, h6 { line-height: 1.25; color: var(--dark); }
h1 { font-size: 2.5rem; font-weight: 800; }
h2 { font-size: 2rem; font-weight: 700; }
h3 { font-size: 1.5rem; font-weight: 600; }
h4 { font-size: 1.25rem; font-weight: 600; }

p { margin-bottom: 1rem; color: var(--gray-700); }

/* ===== UTILITIES ===== */
.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section { padding: 80px 0; }
.section-sm { padding: 48px 0; }
.text-center { text-align: center; }
.text-primary { color: var(--primary); }
.text-muted { color: var(--gray-500); }
.bg-light { background: var(--gray-100); }
.bg-primary-light { background: var(--primary-light); }

.section-header { text-align: center; max-width: 640px; margin: 0 auto 48px; }
.section-header p { margin-top: 12px; font-size: 1.1rem; color: var(--gray-500); }

.grid { display: grid; gap: 24px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 992px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } h1 { font-size: 2rem; } h2 { font-size: 1.5rem; } .section { padding: 48px 0; } }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  font-family: var(--font);
  text-align: center;
  justify-content: center;
}

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

.btn-outline { border-color: var(--primary); color: var(--primary); background: transparent; }
.btn-outline:hover { background: var(--primary); color: var(--white); }

.btn-white { background: var(--white); color: var(--primary); }
.btn-white:hover { background: var(--gray-100); color: var(--primary); }

.btn-success { background: var(--success); color: var(--white); }
.btn-success:hover { background: #059669; color: var(--white); }

.btn-lg { padding: 16px 32px; font-size: 1.05rem; }
.btn-sm { padding: 8px 16px; font-size: 0.85rem; }
.btn-block { width: 100%; }

/* ===== HEADER / NAV ===== */
.header {
  background: var(--white);
  border-bottom: 1px solid var(--gray-300);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--dark);
  display: flex;
  align-items: center;
  gap: 8px;
}
.logo span { color: var(--primary); }

.nav { display: flex; align-items: center; gap: 4px; }

.nav-link {
  padding: 8px 16px;
  color: var(--gray-700);
  font-weight: 500;
  font-size: 0.95rem;
  border-radius: var(--radius);
  transition: all var(--transition);
  position: relative;
}
.nav-link:hover { color: var(--primary); background: var(--primary-light); }
.nav-link.active { color: var(--primary); font-weight: 600; }

/* Dropdown */
.nav-item { position: relative; }
.nav-dropdown {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--white);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  min-width: 240px;
  padding: 8px;
  z-index: 100;
}
.nav-item:hover .nav-dropdown { display: block; }
.nav-dropdown a {
  display: block;
  padding: 10px 16px;
  color: var(--gray-700);
  border-radius: 6px;
  font-size: 0.9rem;
}
.nav-dropdown a:hover { background: var(--primary-light); color: var(--primary); }

.header-actions { display: flex; align-items: center; gap: 12px; }

/* Mobile menu */
.mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
}
.mobile-toggle svg { width: 24px; height: 24px; stroke: var(--dark); }

@media (max-width: 768px) {
  .mobile-toggle { display: block; }
  .nav, .header-actions { display: none; }
  .nav.open, .header-actions.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--white);
    border-bottom: 1px solid var(--gray-300);
    padding: 16px 24px;
    box-shadow: var(--shadow);
  }
  .header-actions.open { top: auto; }
}

/* ===== HERO ===== */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, #2563eb 50%, var(--accent) 100%);
  color: var(--white);
  padding: 80px 0;
  position: relative;
  overflow: hidden;
}
.hero::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.05'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
  pointer-events: none;
}
.hero-content { position: relative; z-index: 1; max-width: 640px; }
.hero h1 { color: var(--white); font-size: 3rem; margin-bottom: 16px; }
.hero p { color: rgba(255,255,255,0.9); font-size: 1.2rem; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; }

@media (max-width: 640px) { .hero h1 { font-size: 2rem; } .hero { padding: 48px 0; } }

/* ===== CARDS ===== */
.card {
  background: var(--white);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  padding: 32px;
  transition: all var(--transition);
}
.card:hover { box-shadow: var(--shadow); border-color: var(--primary); transform: translateY(-2px); }

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: 12px;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  font-size: 1.5rem;
}

.card h3 { margin-bottom: 8px; }
.card p { font-size: 0.95rem; margin-bottom: 16px; }

/* Article Card */
.article-card { overflow: hidden; padding: 0; }
.article-card-img {
  height: 200px;
  background: var(--primary-light);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--primary);
}
.article-card-body { padding: 24px; }
.article-card-meta { display: flex; gap: 16px; margin-bottom: 8px; font-size: 0.85rem; color: var(--gray-500); }
.article-card-body h3 { font-size: 1.15rem; margin-bottom: 8px; }
.article-card-body p { font-size: 0.9rem; }

/* Resource Card */
.resource-card {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 24px;
}
.resource-icon {
  width: 48px;
  height: 48px;
  border-radius: 10px;
  background: #fef2f2;
  color: var(--danger);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}
.resource-info { flex: 1; }
.resource-info h4 { font-size: 1rem; margin-bottom: 4px; }
.resource-info p { font-size: 0.85rem; margin-bottom: 0; }

/* ===== BREADCRUMBS ===== */
.breadcrumbs {
  padding: 16px 0;
  border-bottom: 1px solid var(--gray-300);
  font-size: 0.9rem;
}
.breadcrumbs a { color: var(--gray-500); }
.breadcrumbs span { color: var(--gray-500); margin: 0 8px; }
.breadcrumbs strong { color: var(--gray-700); font-weight: 500; }

/* ===== ARTICLE PAGE ===== */
.article-header { padding: 48px 0 32px; max-width: 760px; margin: 0 auto; }
.article-header h1 { font-size: 2.25rem; margin-bottom: 16px; }
.article-meta { display: flex; flex-wrap: wrap; gap: 16px; color: var(--gray-500); font-size: 0.9rem; margin-bottom: 24px; }

.article-content {
  max-width: 760px;
  margin: 0 auto;
  padding-bottom: 64px;
}
.article-content h2 { margin: 40px 0 16px; font-size: 1.5rem; }
.article-content h3 { margin: 32px 0 12px; font-size: 1.25rem; }
.article-content p { font-size: 1.05rem; line-height: 1.75; margin-bottom: 20px; }
.article-content ul, .article-content ol { margin: 0 0 20px 24px; }
.article-content li { margin-bottom: 8px; font-size: 1.05rem; line-height: 1.75; color: var(--gray-700); }
.article-content blockquote {
  border-left: 4px solid var(--primary);
  background: var(--primary-light);
  padding: 20px 24px;
  margin: 24px 0;
  border-radius: 0 var(--radius) var(--radius) 0;
}
.article-content blockquote p { margin-bottom: 0; color: var(--gray-700); }
.article-content img, .article-content .video-embed {
  border-radius: var(--radius);
  margin: 24px 0;
  width: 100%;
}
.video-embed {
  position: relative;
  padding-bottom: 56.25%;
  height: 0;
  overflow: hidden;
  background: var(--dark);
  border-radius: var(--radius);
}
.video-embed iframe {
  position: absolute;
  top: 0; left: 0;
  width: 100%; height: 100%;
  border: 0;
}

.article-content .callout {
  background: var(--primary-light);
  border: 1px solid var(--primary);
  border-radius: var(--radius);
  padding: 20px 24px;
  margin: 24px 0;
}
.article-content .callout-title {
  font-weight: 700;
  color: var(--primary);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 8px;
}

/* Article sidebar */
.article-layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 48px;
  max-width: 1100px;
  margin: 0 auto;
}
.article-sidebar { position: sticky; top: 96px; align-self: start; }
.sidebar-card {
  background: var(--gray-100);
  border-radius: var(--radius);
  padding: 24px;
  margin-bottom: 24px;
}
.sidebar-card h4 { margin-bottom: 16px; font-size: 1rem; }
.sidebar-card ul { list-style: none; }
.sidebar-card li { margin-bottom: 8px; }
.sidebar-card a { font-size: 0.9rem; color: var(--gray-700); }
.sidebar-card a:hover { color: var(--primary); }

@media (max-width: 868px) { .article-layout { grid-template-columns: 1fr; } .article-sidebar { display: none; } }

/* ===== KNOWLEDGE BASE ===== */
.kb-hero {
  background: var(--primary-light);
  padding: 48px 0;
  text-align: center;
}
.kb-hero h1 { font-size: 2rem; margin-bottom: 8px; }
.kb-search {
  max-width: 500px;
  margin: 24px auto 0;
  position: relative;
}
.kb-search input {
  width: 100%;
  padding: 14px 20px 14px 48px;
  border: 2px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 1rem;
  font-family: var(--font);
  transition: border-color var(--transition);
}
.kb-search input:focus { outline: none; border-color: var(--primary); }
.kb-search svg {
  position: absolute;
  left: 16px;
  top: 50%;
  transform: translateY(-50%);
  width: 20px;
  height: 20px;
  stroke: var(--gray-500);
}

.kb-category {
  background: var(--white);
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  padding: 32px;
}
.kb-category h3 { margin-bottom: 16px; display: flex; align-items: center; gap: 10px; }
.kb-category ul { list-style: none; }
.kb-category li { border-bottom: 1px solid var(--gray-100); }
.kb-category li:last-child { border-bottom: none; }
.kb-category a {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 0;
  color: var(--gray-700);
  font-size: 0.95rem;
}
.kb-category a:hover { color: var(--primary); }
.kb-category a::after { content: '\2192'; color: var(--gray-500); transition: transform var(--transition); }
.kb-category a:hover::after { transform: translateX(4px); color: var(--primary); }

/* ===== FORMS ===== */
.form-group { margin-bottom: 20px; }
.form-group label {
  display: block;
  margin-bottom: 6px;
  font-weight: 500;
  font-size: 0.9rem;
  color: var(--gray-700);
}
.form-control {
  width: 100%;
  padding: 12px 16px;
  border: 2px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 0.95rem;
  font-family: var(--font);
  transition: border-color var(--transition);
  background: var(--white);
}
.form-control:focus { outline: none; border-color: var(--primary); }
.form-control::placeholder { color: var(--gray-500); }

select.form-control { appearance: none; background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' fill='%236b7280' viewBox='0 0 16 16'%3E%3Cpath d='M4 6l4 4 4-4'/%3E%3C/svg%3E"); background-repeat: no-repeat; background-position: right 12px center; padding-right: 40px; }

.form-check {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--gray-700);
}
.form-check input[type="checkbox"] { margin-top: 4px; accent-color: var(--primary); }

.form-divider {
  display: flex;
  align-items: center;
  gap: 16px;
  margin: 24px 0;
  color: var(--gray-500);
  font-size: 0.85rem;
}
.form-divider::before, .form-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--gray-300);
}

/* Auth pages */
.auth-page {
  min-height: calc(100vh - 72px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
  background: var(--gray-100);
}
.auth-card {
  background: var(--white);
  border-radius: 12px;
  box-shadow: var(--shadow);
  padding: 48px;
  width: 100%;
  max-width: 440px;
}
.auth-card h1 { font-size: 1.75rem; margin-bottom: 8px; text-align: center; }
.auth-card .subtitle { text-align: center; color: var(--gray-500); margin-bottom: 32px; }
.auth-footer { text-align: center; margin-top: 24px; font-size: 0.9rem; color: var(--gray-500); }

/* ===== RESOURCES / DOWNLOADS ===== */
.download-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(340px, 1fr)); gap: 20px; }

/* ===== TRUST BAR ===== */
.trust-bar {
  background: var(--gray-100);
  padding: 24px 0;
  border-bottom: 1px solid var(--gray-300);
}
.trust-items {
  display: flex;
  justify-content: center;
  gap: 48px;
  flex-wrap: wrap;
  font-size: 0.9rem;
  color: var(--gray-500);
  font-weight: 500;
}
.trust-items span { display: flex; align-items: center; gap: 8px; }

/* ===== CTA BANNER ===== */
.cta-banner {
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 100%);
  color: var(--white);
  padding: 64px 0;
  text-align: center;
}
.cta-banner h2 { color: var(--white); margin-bottom: 12px; }
.cta-banner p { color: rgba(255,255,255,0.9); margin-bottom: 24px; font-size: 1.1rem; }

/* ===== FOOTER ===== */
.footer {
  background: var(--dark);
  color: var(--gray-300);
  padding: 64px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-about .logo { margin-bottom: 16px; }
.footer-about .logo span { color: var(--accent); }
.footer-about p { color: var(--gray-500); font-size: 0.9rem; }

.footer h4 { color: var(--white); font-size: 0.9rem; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 16px; }
.footer ul { list-style: none; }
.footer li { margin-bottom: 10px; }
.footer a { color: var(--gray-500); font-size: 0.9rem; }
.footer a:hover { color: var(--white); }

.footer-bottom {
  border-top: 1px solid var(--gray-700);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 0.85rem;
  color: var(--gray-500);
}

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-bottom { flex-direction: column; text-align: center; }
}
@media (max-width: 480px) { .footer-grid { grid-template-columns: 1fr; } }

/* ===== TAGS / BADGES ===== */
.tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 100px;
  font-size: 0.8rem;
  font-weight: 600;
  background: var(--primary-light);
  color: var(--primary);
}
.tag-success { background: #d1fae5; color: #065f46; }
.tag-warning { background: #fef3c7; color: #92400e; }

/* ===== PAGINATION ===== */
.pagination {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 48px;
}
.pagination a, .pagination span {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid var(--gray-300);
  color: var(--gray-700);
}
.pagination a:hover { border-color: var(--primary); color: var(--primary); }
.pagination .active { background: var(--primary); color: var(--white); border-color: var(--primary); }

/* ===== NEWSLETTER ===== */
.newsletter-form {
  display: flex;
  gap: 12px;
  max-width: 480px;
  margin: 0 auto;
}
.newsletter-form input {
  flex: 1;
  padding: 14px 20px;
  border: 2px solid rgba(255,255,255,0.3);
  border-radius: var(--radius);
  background: rgba(255,255,255,0.15);
  color: var(--white);
  font-size: 1rem;
  font-family: var(--font);
}
.newsletter-form input::placeholder { color: rgba(255,255,255,0.6); }
.newsletter-form input:focus { outline: none; border-color: var(--white); }

@media (max-width: 480px) { .newsletter-form { flex-direction: column; } }

/* ===== TOAST / NOTIFICATIONS ===== */
.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  padding: 16px 24px;
  background: var(--dark);
  color: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
  z-index: 9999;
  transform: translateY(100px);
  opacity: 0;
  transition: all 0.3s ease;
}
.toast.show { transform: translateY(0); opacity: 1; }
.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }

/* ===== MODAL ===== */
.modal-overlay {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 9999;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
}
.modal-overlay.active { opacity: 1; visibility: visible; }
.modal {
  background: var(--white);
  border-radius: 12px;
  padding: 40px;
  max-width: 480px;
  width: 90%;
  box-shadow: var(--shadow-lg);
  transform: scale(0.9);
  transition: transform 0.3s ease;
}
.modal-overlay.active .modal { transform: scale(1); }
.modal-close {
  position: absolute;
  top: 16px;
  right: 16px;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--gray-500);
}