/**
 * ╔═══════════════════════════════════════════════════════════════╗
 * ║  DigiSchool Africa — PREMIUM UI RESTORED                      ║
 * ║  Version: V2.2.x-D RESTORATION                                ║
 * ║  ONE SINGLE CSS — SOURCE OF TRUTH                             ║
 * ║  Inspiration: Zoom.com + Webflow SaaS + Notion Hierarchy      ║
 * ╚═══════════════════════════════════════════════════════════════╝
 */

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

:root {
  /* Brand Colors */
  --ds-green: #26A69A;
  --ds-blue: #1E88E5;
  --ds-purple: #7E57C2;
  --ds-dark: #263238;
  --ds-gray: #546E7A;
  --ds-light-gray: #ECEFF1;
  --ds-white: #FFFFFF;
  --ds-black: #0D1B2A;
  
  /* Semantic Colors */
  --color-primary: #1E88E5;
  --color-secondary: #26A69A;
  --color-accent: #7E57C2;
  --color-success: #4CAF50;
  --color-warning: #FF9800;
  --color-error: #F44336;
  
  /* Gradients Premium */
  --gradient-hero: linear-gradient(135deg, #1E88E5 0%, #26A69A 100%);
  --gradient-b2c: linear-gradient(135deg, #1E88E5 0%, #26A69A 100%);
  --gradient-b2b: linear-gradient(135deg, #263238 0%, #546E7A 100%);
  --gradient-rail-left: linear-gradient(180deg, rgba(30,136,229,0.08) 0%, rgba(38,166,154,0.08) 100%);
  --gradient-rail-right: linear-gradient(180deg, rgba(126,87,194,0.08) 0%, rgba(30,136,229,0.08) 100%);
  
  /* Typography Scale */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-heading: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  
  --text-xs: 0.75rem;      /* 12px */
  --text-sm: 0.875rem;     /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg: 1.125rem;     /* 18px */
  --text-xl: 1.25rem;      /* 20px */
  --text-2xl: 1.5rem;      /* 24px */
  --text-3xl: 1.875rem;    /* 30px */
  --text-4xl: 2.25rem;     /* 36px */
  --text-5xl: 3rem;        /* 48px */
  --text-6xl: 3.75rem;     /* 60px */
  
  /* Spacing Scale */
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-2xl: 24px;
  --radius-full: 9999px;
  
  /* Shadows — Premium Elevation */
  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 12px 48px rgba(0, 0, 0, 0.16);
  --shadow-hover: 0 16px 64px rgba(30, 136, 229, 0.24);
  
  /* Transitions */
  --transition-fast: 0.15s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Layout Constraints */
  --max-width-content: 1280px;
  --max-width-prose: 720px;
  --max-width-narrow: 640px;
  
  /* Z-Index Scale */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* ============================================
   2. BASE STYLES
   ============================================ */
html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  font-size: var(--text-base);
  line-height: 1.65;
  color: var(--ds-dark);
  background: var(--ds-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* ============================================
   3. HEADER — STICKY & CONSISTENT
   ============================================ */
.ds-global-header,
.digischool-global-header {
  position: sticky;
  top: 0;
  left: 0;
  right: 0;
  width: 100%;
  z-index: var(--z-sticky);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(24px) saturate(180%);
  -webkit-backdrop-filter: blur(24px) saturate(180%);
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.ds-global-header.scrolled,
.digischool-global-header.scrolled {
  box-shadow: var(--shadow-md);
  background: rgba(255, 255, 255, 0.98);
}

.ds-header-container {
  max-width: var(--max-width-content);
  margin: 0 auto;
  padding: var(--space-4) var(--space-8);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-8);
}

/* Logo — GUARANTEED VISIBILITY */
.ds-header-logo {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  min-width: 200px;
  height: 56px;
}

.ds-logo-img {
  height: 48px;
  width: auto;
  max-width: none;
  transition: transform var(--transition-base);
}

.ds-header-logo:hover .ds-logo-img {
  transform: scale(1.05);
}

/* Navigation */
.ds-header-nav {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  flex: 1;
  justify-content: center;
}

.ds-nav-link {
  color: var(--ds-dark);
  font-weight: 600;
  font-size: var(--text-base);
  text-decoration: none;
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast);
  position: relative;
}

.ds-nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 80%;
  height: 2px;
  background: var(--gradient-hero);
  border-radius: 999px;
  transition: transform var(--transition-base);
}

.ds-nav-link:hover {
  color: var(--color-primary);
  background: rgba(30, 136, 229, 0.04);
}

.ds-nav-link:hover::after {
  transform: translateX(-50%) scaleX(1);
}

/* Active Navigation State (V2.2.x-K.2) */
.ds-nav-link.active,
.ds-nav-link.nav-active {
  color: var(--color-primary);
  background: rgba(30, 136, 229, 0.08);
  font-weight: 700;
}

.ds-nav-link.active::after,
.ds-nav-link.nav-active::after {
  transform: translateX(-50%) scaleX(1);
}

/* Header Actions */
.ds-header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.ds-header-cta {
  background: var(--gradient-hero);
  color: white;
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: var(--text-base);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.ds-header-cta:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

/* Mobile Menu Toggle */
.ds-menu-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: transparent;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}

.ds-menu-toggle span {
  width: 24px;
  height: 2px;
  background: var(--ds-dark);
  border-radius: 999px;
  transition: all var(--transition-base);
}

/* ============================================
   4. FOOTER — CONSISTENT
   ============================================ */
.ds-global-footer {
  background: linear-gradient(135deg, var(--ds-dark) 0%, #1a237e 100%);
  color: white;
  padding: var(--space-16) var(--space-8) var(--space-8);
  margin-top: var(--space-20);
}

.ds-footer-container {
  max-width: var(--max-width-content);
  margin: 0 auto;
}

.ds-footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--space-12);
  margin-bottom: var(--space-12);
}

.ds-footer-section h3 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin-bottom: var(--space-6);
  color: white;
}

.ds-footer-links {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.ds-footer-link {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  font-size: var(--text-base);
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.ds-footer-link:hover {
  color: white;
  transform: translateX(4px);
}

.ds-footer-bottom {
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  color: rgba(255, 255, 255, 0.7);
  font-size: var(--text-sm);
}

/* ============================================
   5. LAYOUT — ZOOM-LIKE RAILS
   ============================================ */
.ds-page-layout {
  display: flex;
  min-height: 100vh;
  position: relative;
}

.ds-rail-left,
.ds-rail-right {
  position: fixed;
  top: 0;
  bottom: 0;
  width: 15vw;
  max-width: 240px;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.ds-rail-left {
  left: 0;
  background: var(--gradient-rail-left);
}

.ds-rail-right {
  right: 0;
  background: var(--gradient-rail-right);
}

/* Watermark — VISIBLE SUBTLE */
.ds-watermark {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 80%;
  height: auto;
  opacity: 0.08;
  pointer-events: none;
  animation: watermark-float 8s ease-in-out infinite;
}

@keyframes watermark-float {
  0%, 100% { transform: translate(-50%, -50%) translateY(0); }
  50% { transform: translate(-50%, -50%) translateY(-10px); }
}

.ds-main-content {
  flex: 1;
  margin: 0 auto;
  max-width: var(--max-width-content);
  width: 100%;
  padding: var(--space-8);
  position: relative;
  z-index: 1;
}

/* ============================================
   6. CARDS — PREMIUM ELEVATION & HOVER
   ============================================ */
.ds-card {
  background: white;
  border: 1px solid rgba(0, 0, 0, 0.06);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
  position: relative;
  overflow: hidden;
}

.ds-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: var(--gradient-hero);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--transition-base);
}

.ds-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-hover);
  border-color: rgba(30, 136, 229, 0.2);
}

.ds-card:hover::before {
  transform: scaleX(1);
}

/* Card Variants */
.ds-card-formation {
  background: white;
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-base);
  cursor: pointer;
}

.ds-card-formation:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
}

.ds-card-module {
  background: linear-gradient(135deg, rgba(30, 136, 229, 0.02) 0%, rgba(38, 166, 154, 0.02) 100%);
  border: 1px solid rgba(30, 136, 229, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: all var(--transition-base);
}

.ds-card-module:hover {
  transform: translateY(-3px);
  background: rgba(30, 136, 229, 0.04);
  border-color: rgba(30, 136, 229, 0.2);
  box-shadow: var(--shadow-lg);
}

/* ============================================
   7. TYPOGRAPHY — HIERARCHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.2;
  color: var(--ds-dark);
  margin-bottom: var(--space-4);
}

h1 {
  font-size: var(--text-5xl);
  letter-spacing: -0.02em;
}

h2 {
  font-size: var(--text-4xl);
  letter-spacing: -0.01em;
}

h3 {
  font-size: var(--text-3xl);
}

h4 {
  font-size: var(--text-2xl);
}

h5 {
  font-size: var(--text-xl);
}

h6 {
  font-size: var(--text-lg);
  font-weight: 600;
}

p {
  font-size: var(--text-base);
  line-height: 1.75;
  color: var(--ds-gray);
  margin-bottom: var(--space-4);
}

.text-lead {
  font-size: var(--text-xl);
  line-height: 1.7;
  color: var(--ds-gray);
}

.text-gradient {
  background: var(--gradient-hero);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ============================================
   8. BUTTONS — PREMIUM INTERACTIONS
   ============================================ */
.ds-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4) var(--space-6);
  border-radius: var(--radius-md);
  font-size: var(--text-base);
  font-weight: 600;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: all var(--transition-base);
  white-space: nowrap;
}

.ds-btn-primary {
  background: var(--gradient-hero);
  color: white;
  box-shadow: var(--shadow-sm);
}

.ds-btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.ds-btn-secondary {
  background: white;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
  box-shadow: var(--shadow-xs);
}

.ds-btn-secondary:hover {
  background: rgba(30, 136, 229, 0.04);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.ds-btn-ghost {
  background: transparent;
  color: var(--ds-dark);
  border: 1px solid rgba(0, 0, 0, 0.1);
}

.ds-btn-ghost:hover {
  background: rgba(0, 0, 0, 0.04);
  border-color: rgba(0, 0, 0, 0.2);
}

/* Button Sizes */
.ds-btn-sm {
  padding: var(--space-2) var(--space-4);
  font-size: var(--text-sm);
}

.ds-btn-lg {
  padding: var(--space-5) var(--space-8);
  font-size: var(--text-lg);
}

/* ============================================
   9. ICONS — SVG INTEGRATION
   ============================================ */
.ds-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  color: currentColor;
}

.ds-icon-lg {
  width: 48px;
  height: 48px;
}

.ds-icon-xl {
  width: 64px;
  height: 64px;
}

.ds-icon-badge {
  background: rgba(30, 136, 229, 0.1);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* ============================================
   10. GRID LAYOUTS
   ============================================ */
.ds-grid {
  display: grid;
  gap: var(--space-6);
}

.ds-grid-2 {
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.ds-grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.ds-grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

/* ============================================
   11. CHATBOT — AUTO-MINIMIZE ON ASSESSMENT
   ============================================ */
.ds-chatbot-widget {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: var(--z-modal);
  transition: all var(--transition-base);
}

body[data-page="assessment"] .ds-chatbot-widget {
  bottom: 24px;
  right: 24px;
  transform: scale(0.85);
  opacity: 0.7;
}

body[data-page="assessment"] .ds-chatbot-widget:hover {
  transform: scale(1);
  opacity: 1;
}

/* ============================================
   12. RESPONSIVE — MOBILE FIRST
   ============================================ */
@media (max-width: 768px) {
  :root {
    --text-5xl: 2rem;
    --text-4xl: 1.75rem;
    --text-3xl: 1.5rem;
  }
  
  .ds-header-nav {
    display: none;
  }
  
  .ds-menu-toggle {
    display: flex;
  }
  
  .ds-rail-left,
  .ds-rail-right {
    display: none;
  }
  
  .ds-main-content {
    padding: var(--space-4);
  }
  
  .ds-grid-2,
  .ds-grid-3,
  .ds-grid-4 {
    grid-template-columns: 1fr;
  }
}

/* ============================================
   13. UTILITY CLASSES
   ============================================ */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-4 { margin-top: var(--space-4); }
.mt-6 { margin-top: var(--space-6); }
.mt-8 { margin-top: var(--space-8); }
.mt-12 { margin-top: var(--space-12); }

.mb-4 { margin-bottom: var(--space-4); }
.mb-6 { margin-bottom: var(--space-6); }
.mb-8 { margin-bottom: var(--space-8); }
.mb-12 { margin-bottom: var(--space-12); }

.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-center { justify-content: center; }
.gap-4 { gap: var(--space-4); }
.gap-6 { gap: var(--space-6); }

.hidden { display: none; }
.block { display: block; }
.inline-block { display: inline-block; }

/* ============================================
   14. ANIMATIONS
   ============================================ */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes slideInLeft {
  from { opacity: 0; transform: translateX(-30px); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes slideInRight {
  from { opacity: 0; transform: translateX(30px); }
  to { opacity: 1; transform: translateX(0); }
}

.animate-fade-in {
  animation: fadeIn 0.6s ease-out;
}

.animate-slide-in-left {
  animation: slideInLeft 0.6s ease-out;
}

.animate-slide-in-right {
  animation: slideInRight 0.6s ease-out;
}

/* ============================================
   15. ACCESSIBILITY
   ============================================ */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

/* ============================================
   END — DigiSchool Africa Premium UI Restored
   ============================================ */