/* components.css - GenZ Premium Tech Overhaul */

/* --- Buttons --- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 14px 28px; border-radius: var(--radius-sm);
  font-family: var(--font-heading);
  font-weight: 700; font-size: 0.95rem; cursor: pointer;
  transition: var(--transition); border: none; text-decoration: none;
  white-space: nowrap; letter-spacing: 0.02em;
}
.btn-primary { 
  background: var(--gradient-gold); 
  color: #000; 
  box-shadow: 0 4px 15px rgba(255, 215, 0, 0.2);
}
.btn-primary:hover { 
  background: linear-gradient(135deg, #FFEA00 0%, #FFB300 100%);
  color: #000; 
  transform: translateY(-3px) scale(1.02); 
  box-shadow: var(--shadow-glow-gold); 
}
.btn-outline { 
  background: transparent; 
  color: var(--accent-yellow); 
  border: 1.5px solid var(--accent-yellow); 
}
.btn-outline:hover { 
  background: var(--accent-yellow-glow); 
  color: #fff; 
  transform: translateY(-2px); 
  box-shadow: var(--shadow-glow-gold);
}

/* --- Cards --- */
.card {
  background: var(--bg-card); 
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md); 
  padding: 32px;
  transition: var(--transition); 
  position: relative; 
  overflow: hidden;
  backdrop-filter: blur(10px);
}
.card::before {
  content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 100%;
  background: radial-gradient(circle at top right, rgba(59, 130, 246, 0.08), transparent 70%);
  opacity: 0; transition: var(--transition); pointer-events: none;
}
.card:hover { 
  border-color: rgba(59, 130, 246, 0.3); 
  transform: translateY(-4px); 
  box-shadow: var(--shadow-glow); 
  background: var(--bg-card-hover);
}
.card:hover::before { opacity: 1; }

@media (max-width: 640px) {
  .card { padding: 20px; }
  .card-icon { width: 44px; height: 44px; font-size: 1.25rem; margin-bottom: 16px; }
  .card-title { font-size: 1.05rem; }
}

.card-title { font-family: var(--font-heading); font-size: 1.15rem; font-weight: 700; margin-bottom: 0.75rem; color: var(--text-primary); }
.card-desc { font-size: 0.95rem; color: var(--text-secondary); line-height: 1.6; }
.card-icon {
  width: 54px; height: 54px; border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; margin-bottom: 20px; 
  background: rgba(59, 130, 246, 0.1); color: var(--accent-blue);
  border: 1px solid rgba(59, 130, 246, 0.2);
}

/* --- Badges --- */
.badge {
  display: inline-flex; align-items: center; gap: 4px;
  padding: 4px 12px; border-radius: 20px; font-size: 0.75rem; font-weight: 700; letter-spacing: 0.5px;
  font-family: var(--font-heading);
}
.badge-yellow { background: rgba(255,215,0,0.1); color: var(--accent-yellow); border: 1px solid rgba(255,215,0,0.25); }
.badge-blue { background: rgba(59,130,246,0.1); color: var(--accent-blue-light); border: 1px solid rgba(59,130,246,0.25); }
.badge-green { background: rgba(16,185,129,0.1); color: var(--accent-green); border: 1px solid rgba(16,185,129,0.25); }

/* --- Header Component Styles --- */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(3, 7, 18, 0.75); 
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-glass); 
  height: var(--navbar-height);
  display: flex; align-items: center;
}
.header-inner {
  max-width: 1280px; margin: 0 auto; padding: 0 1.5rem;
  display: flex; align-items: center; justify-content: space-between; width: 100%;
}
.logo { display: flex; align-items: center; gap: 12px; text-decoration: none; color: #fff; font-size: 1.35rem; font-weight: 800; font-family: var(--font-heading); letter-spacing: -0.02em; }
.logo-icon {
  width: 40px; height: 40px; 
  background: var(--gradient-accent);
  border-radius: 12px; display: flex; align-items: center; justify-content: center;
  font-weight: 800; color: #fff; font-size: 1.2rem; 
  box-shadow: 0 0 20px rgba(59,130,246,0.4);
}
.logo-text span { color: var(--accent-blue-light); }

.nav-menu { display: flex; align-items: center; gap: 0.5rem; list-style: none; margin: 0; }
.nav-item { position: relative; }
.nav-link {
  display: block; padding: 0.5rem 1rem; color: var(--text-secondary);
  text-decoration: none; font-size: 0.9rem; font-weight: 600; border-radius: var(--radius-sm);
  transition: var(--transition-smooth); white-space: nowrap; font-family: var(--font-heading);
}
.nav-link:hover { color: #fff; background: rgba(255,255,255,0.05); }

.nav-dropdown-toggle { cursor: pointer; }
.nav-dropdown-toggle::after { content: '▾'; margin-left: 6px; font-size: 0.75rem; display: inline-block; transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275); }
.nav-dropdown:hover .nav-dropdown-toggle::after { transform: rotate(180deg); color: var(--accent-blue-light); }

.dropdown-menu {
  visibility: hidden; opacity: 0; transform: translateY(10px);
  position: absolute; top: 100%; left: 0;
  background: rgba(17, 24, 39, 0.95); backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-md); padding: 0.75rem; min-width: 240px;
  box-shadow: var(--shadow-card); z-index: 100;
  transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}
.nav-dropdown:hover .dropdown-menu { visibility: visible; opacity: 1; transform: translateY(0); }
.nav-dropdown:hover .dropdown-menu.dropdown-wide { display: flex; }
.dropdown-wide { min-width: 440px; gap: 24px; padding: 20px; }
.dropdown-item {
  display: block; padding: 0.75rem 1.2rem; color: var(--text-secondary); text-decoration: none;
  font-size: 0.9rem; font-weight: 500; border-radius: var(--radius-sm); transition: var(--transition-smooth);
}
.dropdown-item:hover { color: #fff; background: rgba(59, 130, 246, 0.15); transform: translateX(4px); }

.header-right { display: flex; align-items: center; gap: 0.8rem; }
.header-cta { display: flex; align-items: center; gap: 0.75rem; }
.btn-call { display: flex; align-items: center; gap: 6px; padding: 0.6rem 1.2rem; border: 1px solid var(--border-color); border-radius: var(--radius-sm); color: var(--text-primary); text-decoration: none; font-size: 0.9rem; font-weight: 600; transition: var(--transition); font-family: var(--font-heading); }
.btn-call:hover { border-color: var(--accent-blue); color: var(--accent-blue-light); background: rgba(59, 130, 246, 0.05); }
.btn-book { display: inline-flex; align-items: center; gap: 6px; padding: 0.6rem 1.4rem; background: var(--gradient-accent); color: #fff; border-radius: var(--radius-sm); text-decoration: none; font-size: 0.9rem; font-weight: 600; transition: var(--transition); font-family: var(--font-heading); box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3); }
.btn-book:hover { transform: translateY(-2px) scale(1.02); box-shadow: var(--shadow-glow); }

.hamburger { display: none; flex-direction: column; gap: 6px; cursor: pointer; padding: 8px; }
.hamburger span { display: block; width: 26px; height: 2px; background: var(--text-primary); border-radius: 2px; transition: var(--transition); }

.mobile-nav { display: none; position: fixed; top: var(--navbar-height); left: 0; right: 0; bottom: 0; background: rgba(3, 7, 18, 0.98); backdrop-filter: blur(20px); padding: 2rem; overflow-y: auto; z-index: 999; }
.mobile-nav.open { display: block; animation: fadeIn 0.3s ease; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }

.mobile-nav-link { display: block; padding: 1rem 0; border-bottom: 1px solid var(--border-subtle); color: var(--text-secondary); text-decoration: none; font-size: 1.1rem; font-family: var(--font-heading); font-weight: 600; }
.mobile-nav-link:hover { color: var(--accent-blue-light); padding-left: 8px; transition: var(--transition); }
.mobile-nav-section { padding: 1rem 0; border-bottom: 1px solid var(--border-subtle); }
.mobile-nav-section-title { font-size: 0.8rem; font-weight: 800; color: var(--accent-blue); text-transform: uppercase; letter-spacing: 1px; padding: 0.5rem 0; font-family: var(--font-heading); }
.mobile-nav-sub { display: block; padding: 0.75rem 0.5rem; color: var(--text-secondary); text-decoration: none; font-size: 0.95rem; font-weight: 500; }
.mobile-nav-sub:hover { color: #fff; }

@media (max-width: 960px) {
  .nav-menu { display: none; }
  .header-cta .btn-call { display: none; }
  .btn-book { padding: 0.5rem 1rem; font-size: 0.8rem; }
  .hamburger { display: flex; }
}

/* --- Chapter Navbar (sub-navigation for study material pages) --- */
.chapter-navbar {
  position: sticky;
  top: var(--navbar-height);
  left: 0; right: 0;
  background: rgba(3, 7, 18, 0.85);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid var(--border-glass);
  z-index: 998;
  display: flex;
  align-items: center;
  height: 54px;
}
.chapter-navbar .nav-inner {
  display: flex; align-items: center; justify-content: space-between;
  width: 100%; max-width: 1300px; margin: 0 auto; padding: 0 24px;
}
.chapter-navbar .nav-logo { display: none; }
.chapter-navbar .nav-links {
  display: flex; align-items: center; gap: 8px; list-style: none; margin: 0; padding: 0;
  flex-wrap: nowrap; overflow-x: auto; width: 100%; scrollbar-width: none;
}
.chapter-navbar .nav-links::-webkit-scrollbar { display: none; }
.chapter-navbar .nav-links li a {
  color: var(--text-secondary); font-size: 0.85rem; font-weight: 600; font-family: var(--font-heading);
  padding: 8px 14px; border-radius: var(--radius-sm); transition: var(--transition-smooth);
  white-space: nowrap; text-decoration: none; display: block;
}
.chapter-navbar .nav-links li a:hover,
.chapter-navbar .nav-links li a.active {
  color: #fff; background: rgba(255,255,255,0.08); box-shadow: inset 0 0 0 1px rgba(255,255,255,0.1);
}
.chapter-navbar .nav-right { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.chapter-navbar .exam-badge-mini {
  background: var(--gradient-gold); color: #000; font-size: 0.75rem; font-weight: 800; font-family: var(--font-heading);
  padding: 4px 12px; border-radius: 20px; letter-spacing: 0.5px; white-space: nowrap; box-shadow: 0 2px 10px rgba(255,215,0,0.2);
}
.chapter-navbar .hamburger { display: none; }

@media (max-width: 768px) {
  .chapter-navbar { height: auto; padding: 8px 0; }
  .chapter-navbar .nav-links { overflow-x: auto; -webkit-overflow-scrolling: touch; }
}

/* --- Footer Component Styles --- */
.site-footer { background: var(--bg-secondary); border-top: 1px solid var(--border-color); padding: 5rem 1.5rem 2rem; margin-top: 4rem; position: relative; overflow: hidden; }
.site-footer::before { content: ''; position: absolute; top: 0; left: 50%; transform: translateX(-50%); width: 60%; height: 1px; background: linear-gradient(90deg, transparent, var(--accent-blue), transparent); opacity: 0.5; }
.footer-inner { max-width: 1200px; margin: 0 auto; position: relative; z-index: 1; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 4rem; margin-bottom: 4rem; }
.footer-brand .footer-desc { font-size: 0.95rem; color: var(--text-muted); margin: 1.5rem 0; max-width: 320px; line-height: 1.7; }
.footer-contact-item { display: flex; align-items: center; gap: 12px; font-size: 0.9rem; color: var(--text-secondary); margin-bottom: 0.8rem; }
.footer-col h4 { font-size: 0.9rem; font-weight: 800; text-transform: uppercase; letter-spacing: 1.5px; color: var(--text-primary); margin-bottom: 1.5rem; font-family: var(--font-heading); }
.footer-link { display: block; color: var(--text-muted); text-decoration: none; font-size: 0.95rem; padding: 0.4rem 0; transition: var(--transition); }
.footer-link:hover { color: var(--accent-blue-light); padding-left: 4px; }
.footer-bottom { border-top: 1px solid var(--border-subtle); padding-top: 2rem; text-align: center; font-size: 0.9rem; color: var(--text-muted); display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 1rem; }

@media (max-width: 768px) {
  .footer-grid { grid-template-columns: 1fr; gap: 2.5rem; }
  .footer-bottom { justify-content: center; flex-direction: column; }
}