/* ============================================
   Purpose Engine - Shared Design System
   Uplift Education Official Brand Colors
   ============================================ */

/* === CSS Variables (Design Tokens) === */
:root {
  /* Primary Brand Colors - Uplift Official */
  --primary: #0067b1;
  --primary-dark: #004b85;
  --primary-light: #5091cd;
  --primary-glow: rgba(0, 103, 177, 0.3);

  /* Accent Colors - Uplift Official */
  --yellow: #ffc425;
  --orange: #f15d22;
  --brand-gray: #8e8e91;

  /* Extended UI Colors */
  --navy: #0D1421;
  --navy-light: #1a2332;
  --success: #10B981;
  --warning: #F59E0B;
  --danger: #EF4444;
  --purple: #8B5CF6;
  --pink: #EC4899;

  /* Neutrals */
  --gray-50: #F8FAFC;
  --gray-100: #F1F5F9;
  --gray-200: #E2E8F0;
  --gray-300: #CBD5E1;
  --gray-400: #94A3B8;
  --gray-500: #64748B;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1E293B;
  --gray-900: #0F172A;

  /* Shadows */
  --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --card-shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --mega-menu-shadow: 0 20px 40px -8px rgba(0, 0, 0, 0.3), 0 8px 16px -4px rgba(0, 0, 0, 0.2);

  /* Typography */
  --font-family: 'Plus Jakarta Sans', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing */
  --nav-height: 72px;
  --container-max: 1400px;
}

/* === Base Reset === */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

/* === Shared Navigation Styles === */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  z-index: 1000;
  transition: all 0.3s ease;
}

/* Light navigation (for light backgrounds) */
.nav--light {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--gray-200);
}

/* Dark navigation (for dark backgrounds) */
.nav--dark {
  background: rgba(13, 20, 33, 0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: 16px;
  text-decoration: none;
}

.nav__logo-img {
  height: 44px;
  width: auto;
}

.nav__divider {
  width: 1px;
  height: 28px;
}

.nav--light .nav__divider {
  background: var(--gray-200);
}

.nav--dark .nav__divider {
  background: rgba(255, 255, 255, 0.2);
}

.nav__product {
  font-size: 15px;
  font-weight: 600;
}

.nav--light .nav__product {
  color: var(--navy);
}

.nav--dark .nav__product {
  color: white;
}

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

/* =========================================================
   Mobile Menu Stability Layer
   ========================================================= */

.nav__mobile,
#navLinks {
  display: none;
}

@media (min-width: 769px) {
  #navLinks {
    display: none !important;
  }
}

/* Nav link buttons/anchors */
.nav__link {
  padding: 10px 16px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
  border: none;
  cursor: pointer;
  font-family: inherit;
  white-space: nowrap;
}

.nav--light .nav__link {
  color: var(--gray-500);
  background: transparent;
}

.nav--light .nav__link:hover {
  background: var(--gray-100);
  color: var(--gray-700);
}

.nav--light .nav__link--active {
  background: var(--primary);
  color: white;
  font-weight: 600;
}

.nav--dark .nav__link {
  color: rgba(255, 255, 255, 0.7);
  background: transparent;
}

.nav--dark .nav__link:hover {
  background: rgba(255, 255, 255, 0.1);
  color: white;
}

.nav--dark .nav__link--active {
  background: var(--primary);
  color: white;
  font-weight: 600;
}

/* Mobile nav toggle */
.nav__toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  font-size: 24px;
}

.nav--light .nav__toggle {
  color: var(--navy);
}

.nav--dark .nav__toggle {
  color: white;
}

/* === Split Nav Layout === */
.nav__left,
.nav__right {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav__left {
  flex-shrink: 0;
}

.nav__right {
  margin-left: auto;
}

/* ============================================
   MEGA MENU STYLES
   ============================================ */

/* Demo dropdown trigger */
.nav__dropdown {
  position: relative;
}

.nav__dropdown-trigger {
  padding: 10px 16px;
  border-radius: 10px;
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: all 0.2s ease;
  border: none;
  cursor: pointer;
  font-family: inherit;
  white-space: nowrap;
  background: transparent;
}

.nav--dark .nav__dropdown-trigger {
  color: rgba(255, 255, 255, 0.7);
}

.nav--dark .nav__dropdown-trigger:hover,
.nav--dark .nav__dropdown-trigger[aria-expanded="true"] {
  background: rgba(255, 255, 255, 0.1);
  color: white;
}

.nav--light .nav__dropdown-trigger {
  color: var(--gray-500);
}

.nav--light .nav__dropdown-trigger:hover,
.nav--light .nav__dropdown-trigger[aria-expanded="true"] {
  background: var(--gray-100);
  color: var(--gray-700);
}

.nav__dropdown-arrow {
  font-size: 10px;
  transition: transform 0.2s ease;
}

.nav__dropdown-trigger[aria-expanded="true"] .nav__dropdown-arrow {
  transform: rotate(180deg);
}

/* Mega menu panel */
.nav__mega-menu {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  width: 580px;
  background: var(--navy);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 16px;
  box-shadow: var(--mega-menu-shadow);
  padding: 24px;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all 0.2s ease;
  z-index: 1100;
}

.nav__dropdown:hover .nav__mega-menu,
.nav__dropdown:focus-within .nav__mega-menu,
.nav__mega-menu:hover {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* Light theme mega menu */
.nav--light .nav__mega-menu {
  background: white;
  border: 1px solid var(--gray-200);
}

/* Mega menu grid layout */
.mega-menu__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

/* Mega menu sections */
.mega-menu__section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.mega-menu__section--full {
  grid-column: 1 / -1;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: 20px;
  margin-top: 4px;
}

.nav--light .mega-menu__section--full {
  border-top-color: var(--gray-200);
}

/* Section headers */
.mega-menu__header {
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--gray-400);
  padding: 0 12px 8px;
}

/* Mega menu links */
.mega-menu__link {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px;
  border-radius: 10px;
  text-decoration: none;
  transition: all 0.15s ease;
}

.mega-menu__link:hover {
  background: rgba(255, 255, 255, 0.08);
}

.nav--light .mega-menu__link:hover {
  background: var(--gray-100);
}

.mega-menu__icon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 16px;
  flex-shrink: 0;
}

/* Icon color variants */
.mega-menu__icon--yellow {
  background: rgba(255, 196, 37, 0.15);
  color: var(--yellow);
}

.mega-menu__icon--blue {
  background: rgba(0, 103, 177, 0.15);
  color: var(--primary-light);
}

.mega-menu__icon--green {
  background: rgba(16, 185, 129, 0.15);
  color: var(--success);
}

.mega-menu__icon--purple {
  background: rgba(139, 92, 246, 0.15);
  color: #A78BFA;
}

.mega-menu__icon--orange {
  background: rgba(241, 93, 34, 0.15);
  color: var(--orange);
}

.mega-menu__content {
  flex: 1;
  min-width: 0;
}

.mega-menu__title {
  font-size: 14px;
  font-weight: 600;
  color: white;
  margin-bottom: 2px;
}

.nav--light .mega-menu__title {
  color: var(--navy);
}

.mega-menu__desc {
  font-size: 12px;
  color: var(--gray-400);
  line-height: 1.4;
}

/* ============================================
   MOBILE MEGA MENU
   ============================================ */

@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
  }

  .nav {
    padding: 0 20px;
  }

  .nav__logo-img {
    height: 36px;
  }

  .nav__divider,
  .nav__product {
    display: none;
  }

  .nav__toggle {
    display: block;
  }

  /* Hide desktop nav elements */
  .nav__left > .nav__links,
  .nav__right {
    display: none;
  }

  /* Mobile menu container */
  .nav__mobile,
  #navLinks {
    display: none;
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    padding: 16px;
    gap: 4px;
    z-index: 1100;
    max-height: calc(100vh - var(--nav-height));
    overflow-y: auto;
  }

  .nav--light .nav__mobile,
  .nav--light #navLinks {
    background: white;
    border-bottom: 1px solid var(--gray-200);
  }

  .nav--dark .nav__mobile,
  .nav--dark #navLinks {
    background: var(--navy);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .nav__mobile.open,
  #navLinks.open {
    display: flex;
  }

  /* Mobile section headers */
  .mobile-menu__header {
    font-size: 10px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    color: var(--gray-400);
    padding: 16px 12px 8px;
    margin-top: 8px;
  }

  .mobile-menu__header:first-child {
    margin-top: 0;
    padding-top: 8px;
  }

  /* Mobile links */
  .nav__link {
    padding: 12px 16px;
    font-size: 14px;
    justify-content: flex-start;
  }

  .nav__link-text {
    display: inline;
  }

  .container {
    padding: 0 20px;
  }

  .page-content {
    padding-top: calc(var(--nav-height) + 24px);
  }

  .btn {
    padding: 12px 16px;
    font-size: 13px;
  }
}

/* Small Mobile - 480px */
@media (max-width: 480px) {
  .nav {
    padding: 0 16px;
  }

  .nav__logo-img {
    height: 32px;
  }

  .container {
    padding: 0 16px;
  }

  .card__content {
    padding: 16px;
  }

  .btn {
    padding: 10px 14px;
    font-size: 12px;
    border-radius: 10px;
  }
}

/* ============================================
   SHARED BUTTON STYLES
   ============================================ */

.btn {
  padding: 12px 20px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: inherit;
  border: none;
  text-decoration: none;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn--primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
}

.btn--primary:hover {
  box-shadow: 0 4px 12px var(--primary-glow);
}

.btn--yellow {
  background: var(--yellow);
  color: var(--navy);
}

.btn--yellow:hover {
  box-shadow: 0 4px 12px rgba(255, 196, 37, 0.4);
}

.btn--secondary {
  background: white;
  border: 1px solid var(--gray-200);
  color: var(--navy);
}

.btn--secondary:hover {
  background: var(--gray-50);
}

.btn--ghost {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.2);
  color: white;
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* ============================================
   SHARED CARD STYLES
   ============================================ */

.card {
  background: white;
  border-radius: 20px;
  box-shadow: var(--card-shadow);
  overflow: hidden;
}

.card--dark {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.card__header {
  padding: 20px 24px;
  border-bottom: 1px solid var(--gray-100);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.card__title {
  font-size: 16px;
  font-weight: 700;
  color: var(--navy);
}

.card__content {
  padding: 24px;
}

/* ============================================
   SHARED CONTAINER
   ============================================ */

.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 40px;
}

.page-content {
  padding-top: calc(var(--nav-height) + 32px);
  min-height: 100vh;
}

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideIn {
  from { opacity: 0; transform: translateX(-20px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 20px var(--primary-glow); }
  50% { box-shadow: 0 0 40px var(--primary-glow); }
}

.animate-fade-in {
  animation: fadeIn 0.4s ease forwards;
}

.animate-slide-in {
  animation: slideIn 0.4s ease forwards;
}

.animate-scale-in {
  animation: scaleIn 0.3s ease forwards;
}

/* ============================================
   UTILITY CLASSES
   ============================================ */

.text-primary { color: var(--primary); }
.text-yellow { color: var(--yellow); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }
.text-white { color: white; }
.text-gray-400 { color: var(--gray-400); }
.text-gray-500 { color: var(--gray-500); }
.text-navy { color: var(--navy); }

.bg-primary { background: var(--primary); }
.bg-navy { background: var(--navy); }
.bg-gray-50 { background: var(--gray-50); }
.bg-gray-100 { background: var(--gray-100); }

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
  .nav,
  .btn {
    display: none;
  }

  .page-content {
    padding-top: 0;
  }
}