/* ==========================================================================
   ClassKit Global - Component Styles
   Buttons, Badges, Form Controls, Cards, Pro Locks
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. Button System
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: all 0.18s cubic-bezier(0.16, 1, 0.3, 1);
  white-space: nowrap;
  user-select: none;
  outline: none;
}

.btn:focus-visible {
  box-shadow: 0 0 0 3px var(--primary-ring);
}

/* Button Sizes */
.btn-sm {
  padding: 6px 12px;
  font-size: 13px;
  border-radius: var(--radius-sm);
}

.btn-md {
  padding: 9px 18px;
  font-size: 14px;
}

.btn-lg {
  padding: 13px 26px;
  font-size: 16px;
  font-weight: 700;
  border-radius: var(--radius-lg);
}

/* Button Variants */
/* Primary Brand: Rose Crimson */
.btn-primary {
  background-color: var(--primary);
  color: var(--text-inverse);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
  background-color: var(--primary-hover);
  box-shadow: var(--shadow-md), 0 0 12px rgba(225, 29, 72, 0.25);
  transform: translateY(-1px);
}

.btn-primary:active {
  background-color: var(--primary-active);
  transform: translateY(0);
}

/* Secondary: Crisp Slate Surface */
.btn-secondary {
  background-color: var(--bg-surface);
  color: var(--text-main);
  border-color: var(--border-medium);
  box-shadow: var(--shadow-xs);
}

.btn-secondary:hover {
  background-color: var(--bg-subtle);
  border-color: var(--text-light);
  color: var(--text-main);
  transform: translateY(-1px);
}

.btn-secondary:active {
  background-color: var(--bg-hover);
  transform: translateY(0);
}

/* Outline Primary */
.btn-outline-primary {
  background-color: transparent;
  color: var(--primary);
  border-color: var(--primary);
}

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

/* Pro / Monetization CTA: Amber Gold Gradient */
.btn-pro {
  background: var(--pro-gradient);
  color: #FFFFFF;
  box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
  font-weight: 700;
}

.btn-pro:hover {
  filter: brightness(1.06);
  box-shadow: 0 4px 16px rgba(245, 158, 11, 0.4);
  transform: translateY(-1px);
}

.btn-pro:active {
  transform: translateY(0);
}

/* Ghost / Minimal */
.btn-ghost {
  background: transparent;
  color: var(--text-muted);
}

.btn-ghost:hover {
  background-color: var(--bg-subtle);
  color: var(--text-main);
}

/* --------------------------------------------------------------------------
   2. Badge & Chip System
   -------------------------------------------------------------------------- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  padding: 3px 9px;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
}

.badge-primary {
  background-color: var(--primary-soft);
  color: var(--primary);
  border-color: var(--primary-border);
}

.badge-pro {
  background: var(--pro-badge-gradient);
  color: var(--pro-gold-text);
  border-color: var(--pro-gold-border);
  box-shadow: 0 1px 3px rgba(245, 158, 11, 0.12);
}

.badge-cs {
  background-color: var(--accent-cs-soft);
  color: var(--accent-cs);
  border-color: var(--accent-cs-border);
}

.badge-stem {
  background-color: var(--accent-stem-soft);
  color: var(--accent-stem);
  border-color: var(--accent-stem-border);
}

.badge-free {
  background-color: var(--bg-subtle);
  color: var(--text-muted);
  border-color: var(--border-light);
}

.badge-noprep {
  background-color: #F1F5F9;
  color: #475569;
  border-color: #CBD5E1;
  font-size: 10px;
  padding: 2px 7px;
  letter-spacing: 0.02em;
}

/* --------------------------------------------------------------------------
   3. Form Inputs & Select Controls
   -------------------------------------------------------------------------- */
.input-control, .select-control {
  width: 100%;
  padding: 9px 13px;
  font-family: inherit;
  font-size: 13.5px;
  color: var(--text-main);
  background-color: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-md);
  outline: none;
  transition: all 0.15s ease;
}

.input-control:hover, .select-control:hover {
  border-color: var(--text-light);
}

.input-control:focus, .select-control:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-ring);
  background-color: #FFFFFF;
}

/* --------------------------------------------------------------------------
   4. Interactive Toolkit Card
   -------------------------------------------------------------------------- */
.toolkit-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 24px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 16px;
  box-shadow: var(--shadow-sm);
  transition: all 0.22s cubic-bezier(0.16, 1, 0.3, 1);
  text-decoration: none;
  color: inherit;
  position: relative;
  overflow: hidden;
}

.toolkit-card:hover {
  transform: translateY(-3px);
  border-color: var(--primary-border);
  box-shadow: var(--shadow-md), 0 0 16px rgba(225, 29, 72, 0.08);
}

.toolkit-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--primary);
  opacity: 0;
  transition: opacity 0.2s ease;
}

.toolkit-card:hover::before {
  opacity: 1;
}

/* --------------------------------------------------------------------------
   5. Pro Locked Overlays & Badges
   -------------------------------------------------------------------------- */
.locked-indicator {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  color: var(--pro-gold-text);
  background-color: var(--pro-gold-soft);
  border: 1px solid var(--pro-gold-border);
  font-size: 11px;
  font-weight: 700;
  padding: 2px 7px;
  border-radius: var(--radius-sm);
}

.answer-key-locked {
  filter: blur(4px);
  user-select: none;
  pointer-events: none;
  position: relative;
}

/* --------------------------------------------------------------------------
   6. Mega Menu Dropdown Navigation
   -------------------------------------------------------------------------- */
.nav-item-dropdown {
  position: static;
  display: inline-flex;
  align-items: center;
  height: 100%;
}

.nav-link-dropdown {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--text-secondary);
  text-decoration: none;
  font-weight: 600;
  font-size: 14px;
  padding: 8px 12px;
  border-radius: var(--radius-md);
  transition: all 0.15s ease;
  cursor: pointer;
  background: transparent;
  border: none;
  font-family: inherit;
}

.nav-link-dropdown:hover,
.nav-item-dropdown:hover .nav-link-dropdown {
  color: var(--primary);
  background-color: var(--primary-soft);
}

.nav-dropdown-chevron {
  width: 14px;
  height: 14px;
  transition: transform 0.2s ease;
}

.nav-item-dropdown:hover .nav-dropdown-chevron {
  transform: rotate(180deg);
}

.nav-item-dropdown::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  height: 10px;
}

.mega-dropdown-panel {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(4px);
  width: min(1180px, calc(100vw - 48px));
  max-width: 96vw;
  background: var(--bg-surface);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-lg);
  box-shadow: 0 24px 48px -6px rgba(15, 23, 42, 0.16), 0 8px 18px -2px rgba(15, 23, 42, 0.06);
  padding: 24px 28px 18px 28px;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.18s cubic-bezier(0.16, 1, 0.3, 1), transform 0.18s cubic-bezier(0.16, 1, 0.3, 1), visibility 0.18s;
  pointer-events: none;
  z-index: 1000;
}

.nav-item-dropdown:hover .mega-dropdown-panel,
.nav-item-dropdown:focus-within .mega-dropdown-panel {
  opacity: 1;
  visibility: visible;
  transform: translateX(-50%) translateY(0);
  pointer-events: auto;
}

.mega-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.mega-col-header {
  font-size: 11px;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-light);
  margin-bottom: 8px;
  display: flex;
  align-items: center;
  gap: 6px;
  padding-bottom: 7px;
  border-bottom: 1px solid var(--border-light);
}

.mega-items-list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.mega-item-link {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 10px;
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text-main);
  transition: background-color 0.15s ease, transform 0.15s ease;
}

.mega-item-link:hover {
  background-color: var(--bg-subtle);
  transform: translateX(2px);
}

.mega-item-icon {
  font-size: 18px;
  line-height: 1;
  flex-shrink: 0;
  margin-top: 1px;
}

.mega-item-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
  flex: 1;
}

.mega-item-title {
  font-size: 13px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.25;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mega-item-link:hover .mega-item-title {
  color: var(--primary);
}

.mega-item-meta {
  font-size: 11px;
  color: var(--text-muted);
  display: flex;
  align-items: center;
  gap: 6px;
  line-height: 1.3;
  margin-top: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mega-item-badge {
  font-size: 8.5px;
  font-weight: 700;
  padding: 1px 5px;
  border-radius: 3px;
  background: #F1F5F9;
  color: #475569;
  border: 1px solid #E2E8F0;
  letter-spacing: 0.02em;
  white-space: nowrap !important;
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  line-height: 1.2;
}

.mega-item-badge.badge-new {
  background: #ECFDF5;
  color: #059669;
  border-color: #A7F3D0;
}

.mega-dropdown-footer {
  margin-top: 18px;
  padding-top: 12px;
  border-top: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-muted);
}

.mega-footer-link {
  color: var(--primary);
  text-decoration: none;
  font-weight: 700;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}

.mega-footer-link:hover {
  text-decoration: underline;
}

/* Responsive Mega Menu for Mobile/Tablet */
@media (max-width: 900px) {
  .nav-item-dropdown {
    position: relative;
  }

  .mega-dropdown-panel {
    position: fixed;
    top: 64px;
    left: 16px;
    right: 16px;
    width: auto;
    max-width: none;
    transform: none !important;
    max-height: calc(85vh - 64px);
    overflow-y: auto;
    padding: 18px;
  }

  .mega-grid {
    grid-template-columns: 1fr 1fr;
    gap: 16px;
  }
}

@media (max-width: 640px) {
  .mega-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .nav-links {
    gap: 8px;
  }
}