/* ============================================
   SHARED STYLES FOR FOCAL POINT LEARNING
   Light Theme & Dark Theme Support
   ============================================ */

/* Root CSS Variables - Light Theme (Default) */
:root {
  --color-primary: #0b3d91;
  --color-secondary: #4682B4;
  --color-accent: #FFC107;
  --color-background: #FFFFFF;
  --color-surface: #F5F7FA;
  --color-text: #1A1A1A;
  --color-text-light: #666666;
  --color-border: #E0E0E0;
  --color-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);

  /* Typography */
  --font-serif: 'Playfair Display', serif;
  --font-mono: 'IBM Plex Mono', monospace;
  --font-sans: 'Work Sans', 'Segoe UI', sans-serif;
  --font-code: 'JetBrains Mono', monospace;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;

  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-base: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html, body {
  height: 100%;
  overflow-x: hidden;
}

body {
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-background);
  line-height: 1.6;
  transition: background-color var(--transition-base), color var(--transition-base);
  padding-top: 70px;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-primary);
  transition: color var(--transition-base);
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin-bottom: var(--spacing-lg);
}

h2 {
  font-size: clamp(1.75rem, 4vw, 3rem);
  margin-bottom: var(--spacing-lg);
}

h3 {
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  margin-bottom: var(--spacing-md);
}

p, li {
  color: var(--color-text-light);
  transition: color var(--transition-base);
}

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

a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

/* ============================================
   HEADER & NAVIGATION
   ============================================ */

header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: var(--color-background);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-base);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

.navbar {
  padding: var(--spacing-md) 0;
  background: var(--color-background) !important;
  transition: all var(--transition-base);
}

.navbar-brand {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary) !important;
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

.nav-link {
  font-family: var(--font-sans);
  color: var(--color-text) !important;
  transition: all var(--transition-fast);
  margin: 0 var(--spacing-sm);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--color-accent);
  transition: width var(--transition-fast);
}

.nav-link:hover::after {
  width: 100%;
}

.navbar-toggler {
  border: none;
}

.navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%230b3d91' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

/* Theme & Language Toggles */
.control-buttons {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
  margin-left: auto;
}

.control-buttons button, .control-buttons select {
  background: none;
  border: 1px solid var(--color-border);
  color: var(--color-text);
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  cursor: pointer;
  font-size: 0.9rem;
  transition: all var(--transition-fast);
  font-family: var(--font-sans);
}

.control-buttons button:hover, .control-buttons select:hover {
  background-color: var(--color-surface);
  border-color: var(--color-accent);
  color: var(--color-accent);
}

#theme-toggle {
  font-size: 1.2rem;
}

/* ============================================
   HERO SECTIONS
   ============================================ */

.hero-banner {
  position: relative;
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin-bottom: var(--spacing-2xl);
}

.hero-banner img {
  position: absolute;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -1;
}

.hero-content {
  text-align: center;
  color: white;
  z-index: 1;
  position: relative;
  animation: slideInUp 0.8s ease-out;
}

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

/* ============================================
   BENTO GRID SYSTEM
   ============================================ */

.bento-grid {
  display: grid;
  gap: var(--spacing-lg);
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  margin: var(--spacing-2xl) 0;
}

@media (min-width: 768px) {
  .bento-grid {
    grid-template-columns: repeat(12, 1fr);
  }
}

.bento-item {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  transition: all var(--transition-base);
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.bento-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
  border-color: var(--color-accent);
}

/* Grid span utilities */
.bento-span-1 { grid-column: span 1; }
.bento-span-2 { grid-column: span 2; }
.bento-span-3 { grid-column: span 3; }

@media (min-width: 768px) {
  .bento-item-lg {
    grid-column: span 6;
    grid-row: span 2;
  }

  .bento-item-md {
    grid-column: span 4;
  }

  .bento-item-sm {
    grid-column: span 3;
  }

  .bento-hero {
    grid-column: span 12;
    min-height: 400px;
    padding: var(--spacing-2xl);
  }

  .bento-wide {
    grid-column: span 6;
  }

  .bento-tall {
    grid-row: span 2;
  }
}

.bento-item img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
}

.bento-item-content {
  flex-grow: 1;
}

.bento-item h3 {
  margin-bottom: var(--spacing-md);
  font-size: 1.5rem;
}

.bento-item p {
  margin-bottom: var(--spacing-md);
  font-size: 0.95rem;
}

/* ============================================
   CARDS & CONTAINERS
   ============================================ */

.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition-base);
  box-shadow: var(--color-shadow);
}

.card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 24px rgba(0, 0, 0, 0.15);
}

.card-body {
  padding: var(--spacing-lg);
}

.card-title {
  color: var(--color-primary);
  font-family: var(--font-serif);
  margin-bottom: var(--spacing-md);
}

/* Glassmorphism effect */
.glass-effect {
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.2);
}

.theme-dark .glass-effect {
  background: rgba(30, 144, 255, 0.1);
  border: 1px solid rgba(135, 206, 235, 0.2);
}

/* ============================================
   BUTTONS & FORMS
   ============================================ */

.btn {
  border-radius: var(--radius-md);
  padding: var(--spacing-sm) var(--spacing-lg);
  font-family: var(--font-sans);
  font-weight: 600;
  transition: all var(--transition-fast);
  border: none;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
}

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

.btn-primary:hover {
  background-color: var(--color-secondary);
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(11, 61, 145, 0.3);
  color: white;
}

.btn-accent {
  background-color: var(--color-accent);
  color: #000;
}

.btn-accent:hover {
  background-color: #FFD700;
  color: #000;
}

.btn-outline {
  background: transparent;
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}

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

.btn-large {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: 1.1rem;
}

.btn-small {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: 0.85rem;
}

form {
  max-width: 600px;
}

.form-group {
  margin-bottom: var(--spacing-lg);
}

label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  color: var(--color-primary);
}

input, textarea, select {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  color: var(--color-text);
  background-color: var(--color-background);
  transition: all var(--transition-fast);
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px rgba(255, 193, 7, 0.1);
}

/* ============================================
   SECTIONS & SPACING
   ============================================ */

section {
  padding: var(--spacing-2xl) 0;
  transition: all var(--transition-base);
}

.section-dark {
  background-color: var(--color-surface);
}

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

.section-accent h2, .section-accent h3, .section-accent h4, .section-accent h5, .section-accent h6 {
  color: white;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* ============================================
   FOOTER
   ============================================ */

footer {
  background-color: var(--color-primary);
  color: white;
  margin-top: auto;
  transition: all var(--transition-base);
}

footer a {
  color: white;
  opacity: 0.9;
  transition: opacity var(--transition-fast);
}

footer a:hover {
  opacity: 1;
  color: var(--color-accent);
}

footer h6 {
  color: var(--color-accent);
}

.footer-section {
  padding: var(--spacing-2xl) 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom {
  text-align: center;
  padding: var(--spacing-lg) 0;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

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

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

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

.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;
}

.stagger-delay-1 { animation-delay: 0.1s; }
.stagger-delay-2 { animation-delay: 0.2s; }
.stagger-delay-3 { animation-delay: 0.3s; }
.stagger-delay-4 { animation-delay: 0.4s; }

/* ============================================
   RESPONSIVE DESIGN
   ============================================ */

@media (max-width: 768px) {
  body {
    padding-top: 60px;
  }

  h1 {
    font-size: 1.75rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  section {
    padding: var(--spacing-xl) 0;
  }

  .bento-item {
    padding: var(--spacing-md);
  }

  .bento-grid {
    gap: var(--spacing-md);
  }

  .control-buttons {
    gap: var(--spacing-sm);
  }

  .control-buttons button, .control-buttons select {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.8rem;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 var(--spacing-md);
  }

  .btn-large {
    width: 100%;
    padding: var(--spacing-md);
  }

  .control-buttons {
    flex-wrap: wrap;
    width: 100%;
    justify-content: flex-end;
  }
}

/* ============================================
   DARK THEME OVERRIDES
   ============================================ */

.theme-dark {
  --color-background: #0D1B2A;
  --color-surface: #1A2F42;
  --color-text: #E8E8E8;
  --color-text-light: #B0B0B0;
  --color-border: #3A4D5C;
  --color-shadow: 0 2px 12px rgba(0, 0, 0, 0.5);
  --color-primary: #1E90FF;
  --color-secondary: #87CEEB;
  --color-accent: #FFD700;
}

.theme-dark input, .theme-dark textarea, .theme-dark select {
  background-color: var(--color-surface);
  border-color: var(--color-border);
}

.theme-dark .navbar-toggler-icon {
  background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 30 30'%3e%3cpath stroke='%231E90FF' stroke-linecap='round' stroke-miterlimit='10' stroke-width='2' d='M4 7h22M4 15h22M4 23h22'/%3e%3c/svg%3e");
}

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

.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: var(--spacing-md); }
.mt-2 { margin-top: var(--spacing-lg); }
.mt-3 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-md); }
.mb-2 { margin-bottom: var(--spacing-lg); }
.mb-3 { margin-bottom: var(--spacing-xl); }

.p-1 { padding: var(--spacing-md); }
.p-2 { padding: var(--spacing-lg); }
.p-3 { padding: var(--spacing-xl); }

.w-100 { width: 100%; }
.h-100 { height: 100%; }

.opacity-75 { opacity: 0.75; }
.opacity-50 { opacity: 0.5; }

.shadow-sm { box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1); }
.shadow { box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12); }
.shadow-lg { box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15); }

.rounded { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }

.d-flex { display: flex; }
.d-grid { display: grid; }
.align-center { align-items: center; }
.justify-center { justify-content: center; }
.gap-1 { gap: var(--spacing-md); }
.gap-2 { gap: var(--spacing-lg); }

.flex-wrap { flex-wrap: wrap; }
.flex-grow { flex: 1; }