/* ============================================
   EduBro Design System
   Platforma educationala pentru studenti
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  /* Primary palette */
  --primary: #6366f1;
  --primary-dark: #4338ca;
  --primary-darker: #3730a3;
  --primary-light: #a5b4fc;
  --primary-lighter: #e0e7ff;
  --primary-alpha-10: rgba(99, 102, 241, 0.1);
  --primary-alpha-20: rgba(99, 102, 241, 0.2);

  /* Secondary palette */
  --secondary: #06b6d4;
  --secondary-dark: #0891b2;
  --secondary-light: #67e8f9;
  --secondary-lighter: #cffafe;

  /* Semantic colors */
  --success: #10b981;
  --success-light: #d1fae5;
  --warning: #f59e0b;
  --warning-light: #fef3c7;
  --danger: #ef4444;
  --danger-light: #fee2e2;
  --info: #3b82f6;
  --info-light: #dbeafe;

  /* Backgrounds */
  --bg: #ffffff;
  --bg-secondary: #f8fafc;
  --bg-tertiary: #f1f5f9;
  --bg-dark: #0f172a;
  --bg-dark-secondary: #1e293b;

  /* Text */
  --text: #1e293b;
  --text-secondary: #64748b;
  --text-tertiary: #94a3b8;
  --text-inverse: #ffffff;
  --text-link: #6366f1;

  /* Borders */
  --border: #e2e8f0;
  --border-light: #f1f5f9;
  --border-dark: #cbd5e1;

  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;

  /* Border radius */
  --radius-sm: 6px;
  --radius: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  --shadow-primary: 0 4px 14px rgba(99, 102, 241, 0.35);
  --shadow-primary-lg: 0 8px 25px rgba(99, 102, 241, 0.4);

  /* Typography */
  --font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'Fira Code', 'Cascadia Code', monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;

  --leading-tight: 1.2;
  --leading-snug: 1.35;
  --leading-normal: 1.6;
  --leading-relaxed: 1.75;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition: 250ms ease;
  --transition-slow: 350ms ease;

  /* Z-index layers */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-overlay: 400;
  --z-modal: 500;
  --z-toast: 600;

  /* Container */
  --container-max: 1200px;
  --container-narrow: 800px;
  --container-wide: 1400px;
}

/* --- Dark Mode --- */
[data-theme="dark"],
.dark {
  --bg: #0f172a;
  --bg-secondary: #1e293b;
  --bg-tertiary: #334155;
  --bg-dark: #020617;
  --bg-dark-secondary: #0f172a;

  --text: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --text-inverse: #0f172a;
  --text-link: #a5b4fc;

  --border: #334155;
  --border-light: #1e293b;
  --border-dark: #475569;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.4), 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.4), 0 2px 4px -2px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.4), 0 4px 6px -4px rgba(0, 0, 0, 0.3);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 8px 10px -6px rgba(0, 0, 0, 0.3);

  --primary-alpha-10: rgba(99, 102, 241, 0.15);
  --primary-alpha-20: rgba(99, 102, 241, 0.25);

  --success-light: rgba(16, 185, 129, 0.15);
  --warning-light: rgba(245, 158, 11, 0.15);
  --danger-light: rgba(239, 68, 68, 0.15);
  --info-light: rgba(59, 130, 246, 0.15);

  --primary-lighter: rgba(99, 102, 241, 0.1);
  --secondary-lighter: rgba(6, 182, 212, 0.1);
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
  font-size: 16px;
}

body {
  font-family: var(--font-family);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--text);
  background-color: var(--bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a:hover {
  color: var(--primary-dark);
}

[data-theme="dark"] a:hover,
.dark a:hover {
  color: var(--primary-light);
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

button {
  cursor: pointer;
  font-family: inherit;
  font-size: inherit;
  border: none;
  background: none;
}

ul, ol {
  list-style: none;
}

input, textarea, select {
  font-family: inherit;
  font-size: inherit;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: var(--leading-tight);
  color: var(--text);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }

p {
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

.text-gradient {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* --- Container --- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--space-md);
}

.container--narrow {
  max-width: var(--container-narrow);
}

.container--wide {
  max-width: var(--container-wide);
}

/* --- Layout Utilities --- */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-wrap { flex-wrap: wrap; }
.flex-center { display: flex; align-items: center; justify-content: center; }
.flex-between { display: flex; align-items: center; justify-content: space-between; }
.flex-start { display: flex; align-items: center; justify-content: flex-start; }
.flex-end { display: flex; align-items: center; justify-content: flex-end; }
.items-center { align-items: center; }
.items-start { align-items: flex-start; }
.items-end { align-items: flex-end; }
.justify-center { justify-content: center; }
.justify-between { justify-content: space-between; }
.gap-xs { gap: var(--space-xs); }
.gap-sm { gap: var(--space-sm); }
.gap-md { gap: var(--space-md); }
.gap-lg { gap: var(--space-lg); }
.gap-xl { gap: var(--space-xl); }
.gap-2xl { gap: var(--space-2xl); }
.flex-1 { flex: 1; }
.flex-shrink-0 { flex-shrink: 0; }

.grid { display: grid; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }
.grid-cols-5 { grid-template-columns: repeat(5, 1fr); }

/* --- Spacing Utilities --- */
.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }
.mt-3xl { margin-top: var(--space-3xl); }
.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }
.mb-2xl { margin-bottom: var(--space-2xl); }
.mb-3xl { margin-bottom: var(--space-3xl); }
.p-sm { padding: var(--space-sm); }
.p-md { padding: var(--space-md); }
.p-lg { padding: var(--space-lg); }
.p-xl { padding: var(--space-xl); }
.px-md { padding-left: var(--space-md); padding-right: var(--space-md); }
.px-lg { padding-left: var(--space-lg); padding-right: var(--space-lg); }
.py-sm { padding-top: var(--space-sm); padding-bottom: var(--space-sm); }
.py-md { padding-top: var(--space-md); padding-bottom: var(--space-md); }
.py-lg { padding-top: var(--space-lg); padding-bottom: var(--space-lg); }
.py-xl { padding-top: var(--space-xl); padding-bottom: var(--space-xl); }
.py-2xl { padding-top: var(--space-2xl); padding-bottom: var(--space-2xl); }
.py-3xl { padding-top: var(--space-3xl); padding-bottom: var(--space-3xl); }

/* --- Text Utilities --- */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }
.text-xs { font-size: var(--text-xs); }
.text-sm { font-size: var(--text-sm); }
.text-base { font-size: var(--text-base); }
.text-lg { font-size: var(--text-lg); }
.text-xl { font-size: var(--text-xl); }
.text-2xl { font-size: var(--text-2xl); }
.text-3xl { font-size: var(--text-3xl); }
.text-4xl { font-size: var(--text-4xl); }
.text-5xl { font-size: var(--text-5xl); }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }
.font-extrabold { font-weight: 800; }
.text-primary { color: var(--primary); }
.text-secondary-color { color: var(--text-secondary); }
.text-muted { color: var(--text-tertiary); }
.text-success { color: var(--success); }
.text-warning { color: var(--warning); }
.text-danger { color: var(--danger); }
.text-white { color: #ffffff; }
.truncate { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

/* --- Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px 24px;
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: 1;
  border-radius: var(--radius);
  transition: all var(--transition);
  white-space: nowrap;
  text-decoration: none;
  border: 2px solid transparent;
  position: relative;
  overflow: hidden;
}

.btn:active {
  transform: scale(0.97);
}

.btn--primary {
  background: var(--primary);
  color: #ffffff;
  box-shadow: var(--shadow-primary);
}

.btn--primary:hover {
  background: var(--primary-dark);
  box-shadow: var(--shadow-primary-lg);
  color: #ffffff;
  transform: translateY(-1px);
}

.btn--secondary {
  background: var(--secondary);
  color: #ffffff;
}

.btn--secondary:hover {
  background: var(--secondary-dark);
  color: #ffffff;
  transform: translateY(-1px);
}

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

.btn--outline:hover {
  background: var(--primary);
  color: #ffffff;
  transform: translateY(-1px);
}

.btn--outline-white {
  background: transparent;
  color: #ffffff;
  border-color: rgba(255, 255, 255, 0.4);
}

.btn--outline-white:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: #ffffff;
  color: #ffffff;
}

.btn--ghost {
  background: transparent;
  color: var(--text);
  border-color: var(--border);
}

.btn--ghost:hover {
  background: var(--bg-secondary);
  color: var(--text);
  border-color: var(--border-dark);
}

.btn--danger {
  background: var(--danger);
  color: #ffffff;
}

.btn--danger:hover {
  background: #dc2626;
  color: #ffffff;
}

.btn--success {
  background: var(--success);
  color: #ffffff;
}

.btn--success:hover {
  background: #059669;
  color: #ffffff;
}

.btn--sm {
  padding: 8px 16px;
  font-size: var(--text-xs);
}

.btn--lg {
  padding: 16px 32px;
  font-size: var(--text-base);
}

.btn--xl {
  padding: 18px 36px;
  font-size: var(--text-lg);
  border-radius: var(--radius-lg);
}

.btn--full {
  width: 100%;
}

.btn--icon {
  padding: 10px;
  width: 40px;
  height: 40px;
}

.btn--icon.btn--sm {
  padding: 6px;
  width: 32px;
  height: 32px;
}

.btn--icon.btn--lg {
  padding: 14px;
  width: 52px;
  height: 52px;
}

/* --- Cards --- */
.card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-lg);
  transition: all var(--transition);
}

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

.card--flat {
  border: none;
  background: var(--bg-secondary);
}

.card--flat:hover {
  background: var(--bg-tertiary);
}

.card--interactive {
  cursor: pointer;
}

.card--interactive:hover {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-md), 0 0 0 1px var(--primary-alpha-10);
}

/* --- Form Styles --- */
.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.form-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 12px 16px;
  font-size: var(--text-base);
  color: var(--text);
  background: var(--bg);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  transition: all var(--transition-fast);
  outline: none;
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--text-tertiary);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-alpha-10);
}

.form-input--error,
.form-select--error,
.form-textarea--error {
  border-color: var(--danger);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

.form-error {
  font-size: var(--text-xs);
  color: var(--danger);
}

.form-hint {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

.form-textarea {
  resize: vertical;
  min-height: 100px;
}

.form-select {
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 40px;
}

.form-checkbox-group {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
}

.form-checkbox {
  width: 20px;
  height: 20px;
  accent-color: var(--primary);
  cursor: pointer;
}

.form-radio {
  width: 20px;
  height: 20px;
  accent-color: var(--primary);
  cursor: pointer;
}

/* --- Modal --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(4px);
  z-index: var(--z-overlay);
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--space-md);
  opacity: 0;
  transition: opacity var(--transition);
}

.modal-overlay.active {
  display: flex;
  opacity: 1;
}

.modal {
  background: var(--bg);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-2xl);
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  padding: var(--space-xl);
  transform: scale(0.95) translateY(10px);
  transition: transform var(--transition);
}

.modal-overlay.active .modal {
  transform: scale(1) translateY(0);
}

.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
}

.modal__title {
  font-size: var(--text-xl);
  font-weight: 700;
}

.modal__close {
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

.modal__close:hover {
  background: var(--bg-secondary);
  color: var(--text);
}

.modal__body {
  margin-bottom: var(--space-lg);
}

.modal__footer {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-sm);
}

/* --- Toast / Notifications --- */
.toast-container {
  position: fixed;
  top: var(--space-lg);
  right: var(--space-lg);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  pointer-events: none;
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-md) var(--space-lg);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-lg);
  min-width: 300px;
  max-width: 420px;
  pointer-events: auto;
  animation: toastSlideIn 0.3s ease forwards;
}

.toast--removing {
  animation: toastSlideOut 0.3s ease forwards;
}

.toast__icon {
  font-size: var(--text-xl);
  flex-shrink: 0;
}

.toast__content {
  flex: 1;
}

.toast__title {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--text);
}

.toast__message {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  margin-top: 2px;
}

.toast__close {
  color: var(--text-tertiary);
  cursor: pointer;
  padding: 4px;
  flex-shrink: 0;
}

.toast__close:hover {
  color: var(--text);
}

.toast--success { border-left: 4px solid var(--success); }
.toast--success .toast__icon { color: var(--success); }

.toast--danger { border-left: 4px solid var(--danger); }
.toast--danger .toast__icon { color: var(--danger); }

.toast--warning { border-left: 4px solid var(--warning); }
.toast--warning .toast__icon { color: var(--warning); }

.toast--info { border-left: 4px solid var(--info); }
.toast--info .toast__icon { color: var(--info); }

@keyframes toastSlideIn {
  from { opacity: 0; transform: translateX(100%); }
  to { opacity: 1; transform: translateX(0); }
}

@keyframes toastSlideOut {
  from { opacity: 1; transform: translateX(0); }
  to { opacity: 0; transform: translateX(100%); }
}

/* --- Badge --- */
.badge {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  line-height: 1;
}

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

.badge--secondary {
  background: var(--secondary-lighter);
  color: var(--secondary-dark);
}

.badge--success {
  background: var(--success-light);
  color: var(--success);
}

.badge--warning {
  background: var(--warning-light);
  color: #b45309;
}

.badge--danger {
  background: var(--danger-light);
  color: var(--danger);
}

.badge--popular {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #ffffff;
}

/* --- Section Styles --- */
.section {
  padding: var(--space-3xl) 0;
}

.section--alt {
  background: var(--bg-secondary);
}

.section__header {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-2xl);
}

.section__label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--primary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
}

.section__title {
  font-size: var(--text-3xl);
  margin-bottom: var(--space-md);
}

.section__subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
}

/* --- Header / Navigation --- */
.header {
  position: sticky;
  top: 0;
  z-index: var(--z-fixed);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-light);
  transition: all var(--transition);
}

[data-theme="dark"] .header,
.dark .header {
  background: rgba(15, 23, 42, 0.85);
}

.header--scrolled {
  box-shadow: var(--shadow-md);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.header__logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  text-decoration: none;
}

.header__logo img {
  height: 36px;
  width: auto;
}

.header__logo-text {
  font-size: var(--text-xl);
  font-weight: 800;
  color: var(--text);
}

.header__logo-text span {
  color: var(--primary);
}

.header__nav {
  display: none;
  align-items: center;
  gap: var(--space-lg);
}

.header__nav-link {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: color var(--transition-fast);
  position: relative;
}

.header__nav-link:hover,
.header__nav-link.active {
  color: var(--primary);
}

.header__nav-link::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: width var(--transition);
  border-radius: 1px;
}

.header__nav-link:hover::after,
.header__nav-link.active::after {
  width: 100%;
}

.header__actions {
  display: none;
  align-items: center;
  gap: var(--space-sm);
}

.header__hamburger {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: 8px;
  cursor: pointer;
}

.header__hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all var(--transition);
}

.header__hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.header__hamburger.active span:nth-child(2) {
  opacity: 0;
}

.header__hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu */
.mobile-menu {
  position: fixed;
  top: 68px;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--bg);
  z-index: var(--z-overlay);
  padding: var(--space-xl);
  transform: translateX(100%);
  transition: transform var(--transition);
  overflow-y: auto;
}

.mobile-menu.active {
  transform: translateX(0);
}

.mobile-menu__link {
  display: block;
  padding: var(--space-md) 0;
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid var(--border-light);
}

.mobile-menu__link:hover {
  color: var(--primary);
}

.mobile-menu__actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-top: var(--space-xl);
}

.mobile-menu__actions .btn {
  width: 100%;
}

/* --- Hero Section --- */
.hero {
  position: relative;
  padding: var(--space-3xl) 0 var(--space-4xl);
  background: linear-gradient(180deg, var(--primary-lighter) 0%, var(--bg) 100%);
  overflow: hidden;
}

[data-theme="dark"] .hero,
.dark .hero {
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.1) 0%, var(--bg) 100%);
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, var(--primary-alpha-10) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero__content {
  position: relative;
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 6px 16px;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
  box-shadow: var(--shadow-sm);
}

.hero__badge i {
  color: var(--primary);
}

.hero__title {
  font-size: var(--text-4xl);
  font-weight: 800;
  line-height: var(--leading-tight);
  margin-bottom: var(--space-md);
  color: var(--text);
}

.hero__subtitle {
  font-size: var(--text-lg);
  color: var(--text-secondary);
  margin-bottom: var(--space-2xl);
  line-height: var(--leading-relaxed);
}

/* Hero Search Bar */
.hero__search {
  display: flex;
  align-items: center;
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 6px;
  box-shadow: var(--shadow-lg);
  margin-bottom: var(--space-xl);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.hero__search:focus-within {
  border-color: var(--primary);
  box-shadow: var(--shadow-lg), 0 0 0 4px var(--primary-alpha-10);
}

.hero__search-input {
  flex: 1;
  padding: 14px 16px;
  font-size: var(--text-base);
  border: none;
  outline: none;
  background: transparent;
  color: var(--text);
  min-width: 0;
}

.hero__search-input::placeholder {
  color: var(--text-tertiary);
}

.hero__search-select {
  padding: 10px 36px 10px 12px;
  font-size: var(--text-sm);
  font-weight: 500;
  border: none;
  outline: none;
  background: var(--bg-secondary);
  color: var(--text-secondary);
  border-radius: var(--radius-lg);
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  cursor: pointer;
}

.hero__search-btn {
  padding: 12px 24px;
  background: var(--primary);
  color: #ffffff;
  border: none;
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  white-space: nowrap;
}

.hero__search-btn:hover {
  background: var(--primary-dark);
}

/* Hero Stats */
.hero__stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xl);
  flex-wrap: wrap;
  margin-bottom: var(--space-2xl);
}

.hero__stat {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.hero__stat strong {
  color: var(--text);
  font-weight: 700;
}

.hero__stat-divider {
  width: 1px;
  height: 16px;
  background: var(--border);
}

/* Hero CTAs */
.hero__ctas {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

/* --- Subjects Grid --- */
.subjects-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-md);
}

.subject-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-lg);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  transition: all var(--transition);
  position: relative;
  overflow: hidden;
}

.subject-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--subject-color);
  transform: scaleX(0);
  transition: transform var(--transition);
}

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

.subject-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: var(--subject-color, var(--border));
}

.subject-card__icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  font-size: var(--text-2xl);
  margin-bottom: var(--space-md);
  background: var(--subject-bg);
  color: var(--subject-color);
  transition: transform var(--transition);
}

.subject-card:hover .subject-card__icon {
  transform: scale(1.1);
}

.subject-card__name {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-xs);
}

.subject-card__desc {
  font-size: var(--text-xs);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

/* Subject color classes */
.subject--matematica { --subject-color: #6366f1; --subject-bg: var(--primary-alpha-10); }
.subject--romana { --subject-color: #ec4899; --subject-bg: rgba(236, 72, 153, 0.1); }
.subject--fizica { --subject-color: #06b6d4; --subject-bg: rgba(6, 182, 212, 0.1); }
.subject--chimie { --subject-color: #10b981; --subject-bg: rgba(16, 185, 129, 0.1); }
.subject--biologie { --subject-color: #22c55e; --subject-bg: rgba(34, 197, 94, 0.1); }
.subject--istorie { --subject-color: #f59e0b; --subject-bg: rgba(245, 158, 11, 0.1); }
.subject--geografie { --subject-color: #84cc16; --subject-bg: rgba(132, 204, 22, 0.1); }
.subject--engleza { --subject-color: #3b82f6; --subject-bg: rgba(59, 130, 246, 0.1); }
.subject--franceza { --subject-color: #8b5cf6; --subject-bg: rgba(139, 92, 246, 0.1); }
.subject--germana { --subject-color: #eab308; --subject-bg: rgba(234, 179, 8, 0.1); }
.subject--informatica { --subject-color: #0ea5e9; --subject-bg: rgba(14, 165, 233, 0.1); }
.subject--economie { --subject-color: #14b8a6; --subject-bg: rgba(20, 184, 166, 0.1); }
.subject--filosofie { --subject-color: #a855f7; --subject-bg: rgba(168, 85, 247, 0.1); }
.subject--logica { --subject-color: #f97316; --subject-bg: rgba(249, 115, 22, 0.1); }
.subject--psihologie { --subject-color: #e11d48; --subject-bg: rgba(225, 29, 72, 0.1); }

/* --- How It Works --- */
.steps {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xl);
}

.step {
  display: flex;
  align-items: flex-start;
  gap: var(--space-xl);
  text-align: left;
}

.step__number {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--primary), var(--primary-dark));
  color: #ffffff;
  font-size: var(--text-xl);
  font-weight: 800;
  box-shadow: var(--shadow-primary);
}

.step__content h3 {
  font-size: var(--text-xl);
  margin-bottom: var(--space-sm);
}

.step__content p {
  font-size: var(--text-base);
  color: var(--text-secondary);
}

/* --- Features --- */
.features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.feature-card {
  display: flex;
  align-items: flex-start;
  gap: var(--space-lg);
  padding: var(--space-lg);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: all var(--transition);
}

.feature-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--primary-light);
}

.feature-card__icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  background: var(--primary-alpha-10);
  color: var(--primary);
  font-size: var(--text-xl);
}

.feature-card__content h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-xs);
}

.feature-card__content p {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

/* --- Pricing --- */
.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
  max-width: 1000px;
  margin: 0 auto;
}

.pricing-card {
  position: relative;
  background: var(--bg);
  border: 2px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  text-align: center;
  transition: all var(--transition);
}

.pricing-card:hover {
  box-shadow: var(--shadow-xl);
  transform: translateY(-4px);
}

.pricing-card--featured {
  border-color: var(--primary);
  box-shadow: var(--shadow-primary);
  transform: scale(1.02);
}

.pricing-card--featured:hover {
  transform: scale(1.02) translateY(-4px);
  box-shadow: var(--shadow-primary-lg);
}

.pricing-card__badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
}

.pricing-card__name {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--text);
  margin-bottom: var(--space-xs);
}

.pricing-card__price {
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: var(--space-xs);
  margin-bottom: var(--space-xs);
}

.pricing-card__price-amount {
  font-size: var(--text-4xl);
  font-weight: 800;
  color: var(--text);
}

.pricing-card__price-period {
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.pricing-card__desc {
  font-size: var(--text-sm);
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

.pricing-card__features {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  text-align: left;
}

.pricing-card__feature {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--text-sm);
  color: var(--text-secondary);
}

.pricing-card__feature i {
  color: var(--success);
  font-size: var(--text-sm);
}

.pricing-card__feature i.fa-xmark {
  color: var(--text-tertiary);
}

/* --- Testimonials --- */
.testimonials-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

.testimonial-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  transition: all var(--transition);
}

.testimonial-card:hover {
  box-shadow: var(--shadow-md);
}

.testimonial-card__stars {
  display: flex;
  gap: 2px;
  margin-bottom: var(--space-md);
  color: #fbbf24;
  font-size: var(--text-sm);
}

.testimonial-card__text {
  font-size: var(--text-base);
  color: var(--text);
  line-height: var(--leading-relaxed);
  margin-bottom: var(--space-lg);
  font-style: italic;
}

.testimonial-card__author {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.testimonial-card__avatar {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  font-size: var(--text-base);
  color: #ffffff;
}

.testimonial-card__info h4 {
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--text);
}

.testimonial-card__info p {
  font-size: var(--text-xs);
  color: var(--text-secondary);
}

/* --- FAQ --- */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.faq-item {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
}

.faq-item.active {
  border-color: var(--primary-light);
  box-shadow: var(--shadow-sm);
}

.faq-item__question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: var(--space-lg);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--text);
  text-align: left;
  cursor: pointer;
  background: none;
  border: none;
  transition: color var(--transition-fast);
}

.faq-item__question:hover {
  color: var(--primary);
}

.faq-item__icon {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  transition: transform var(--transition);
  flex-shrink: 0;
  margin-left: var(--space-md);
}

.faq-item.active .faq-item__icon {
  transform: rotate(180deg);
  color: var(--primary);
}

.faq-item__answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-slow);
}

.faq-item.active .faq-item__answer {
  max-height: 300px;
}

.faq-item__answer-inner {
  padding: 0 var(--space-lg) var(--space-lg);
  font-size: var(--text-sm);
  color: var(--text-secondary);
  line-height: var(--leading-relaxed);
}

/* --- Footer --- */
.footer {
  background: var(--bg-dark);
  color: var(--text-inverse);
  padding: var(--space-3xl) 0 var(--space-xl);
}

.footer a {
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer a:hover {
  color: #ffffff;
}

.footer__top {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  margin-bottom: var(--space-2xl);
}

.footer__brand {
  max-width: 320px;
}

.footer__brand-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-md);
}

.footer__brand-logo img {
  height: 32px;
}

.footer__brand-logo span {
  font-size: var(--text-xl);
  font-weight: 800;
  color: #ffffff;
}

.footer__brand-logo span em {
  color: var(--primary-light);
  font-style: normal;
}

.footer__brand p {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
  line-height: var(--leading-relaxed);
}

.footer__links-group h4 {
  font-size: var(--text-sm);
  font-weight: 700;
  color: #ffffff;
  margin-bottom: var(--space-md);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer__links {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

.footer__links a {
  font-size: var(--text-sm);
  color: var(--text-tertiary);
}

.footer__social {
  display: flex;
  gap: var(--space-sm);
  margin-top: var(--space-lg);
}

.footer__social a {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius);
  background: var(--bg-dark-secondary);
  color: var(--text-tertiary);
  font-size: var(--text-lg);
  transition: all var(--transition-fast);
}

.footer__social a:hover {
  background: var(--primary);
  color: #ffffff;
  transform: translateY(-2px);
}

.footer__bottom {
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
  text-align: center;
}

.footer__bottom p {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

.footer__bottom-links {
  display: flex;
  gap: var(--space-lg);
  flex-wrap: wrap;
  justify-content: center;
}

.footer__bottom-links a {
  font-size: var(--text-xs);
  color: var(--text-tertiary);
}

/* --- Chat Bubbles --- */
.chat-container {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  padding: var(--space-lg);
}

.chat-bubble {
  max-width: 80%;
  padding: var(--space-md) var(--space-lg);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  line-height: var(--leading-relaxed);
  word-wrap: break-word;
}

.chat-bubble--user {
  align-self: flex-end;
  background: var(--primary);
  color: #ffffff;
  border-bottom-right-radius: var(--radius-sm);
}

.chat-bubble--ai {
  align-self: flex-start;
  background: var(--bg-secondary);
  color: var(--text);
  border: 1px solid var(--border);
  border-bottom-left-radius: var(--radius-sm);
}

.chat-bubble--ai code {
  background: var(--bg-tertiary);
  padding: 2px 6px;
  border-radius: 4px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.chat-input-area {
  display: flex;
  align-items: flex-end;
  gap: var(--space-sm);
  padding: var(--space-md);
  border-top: 1px solid var(--border);
  background: var(--bg);
}

.chat-input {
  flex: 1;
  padding: 12px 16px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius-lg);
  font-size: var(--text-sm);
  outline: none;
  resize: none;
  max-height: 120px;
  color: var(--text);
  background: var(--bg-secondary);
}

.chat-input:focus {
  border-color: var(--primary);
  background: var(--bg);
}

/* --- Gamification --- */
.streak-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: 6px 14px;
  background: linear-gradient(135deg, #f59e0b, #f97316);
  color: #ffffff;
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 700;
  box-shadow: 0 2px 8px rgba(245, 158, 11, 0.3);
}

.points-display {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  padding: 6px 14px;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: #ffffff;
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 700;
  box-shadow: var(--shadow-primary);
}

.badge-collection {
  display: flex;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.gamification-badge {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  font-size: var(--text-xl);
  position: relative;
}

.gamification-badge--bronze {
  background: linear-gradient(135deg, #d97706, #b45309);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(217, 119, 6, 0.3);
}

.gamification-badge--silver {
  background: linear-gradient(135deg, #9ca3af, #6b7280);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(156, 163, 175, 0.3);
}

.gamification-badge--gold {
  background: linear-gradient(135deg, #fbbf24, #f59e0b);
  color: #ffffff;
  box-shadow: 0 2px 8px rgba(251, 191, 36, 0.3);
}

.gamification-badge--locked {
  background: var(--bg-tertiary);
  color: var(--text-tertiary);
  opacity: 0.5;
}

.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  overflow: hidden;
}

.progress-bar__fill {
  height: 100%;
  border-radius: var(--radius-full);
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  transition: width var(--transition-slow);
}

.progress-bar__fill--success {
  background: linear-gradient(90deg, #10b981, #34d399);
}

.progress-bar__fill--warning {
  background: linear-gradient(90deg, #f59e0b, #fbbf24);
}

/* --- Animation Utilities --- */
.fade-in {
  animation: fadeIn 0.5s ease forwards;
}

.fade-in-up {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s ease forwards;
}

.fade-in-down {
  opacity: 0;
  transform: translateY(-20px);
  animation: fadeInDown 0.6s ease forwards;
}

.scale-in {
  opacity: 0;
  transform: scale(0.9);
  animation: scaleIn 0.4s ease forwards;
}

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

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

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

@keyframes scaleIn {
  from { opacity: 0; transform: scale(0.9); }
  to { opacity: 1; transform: scale(1); }
}

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

@keyframes bounce {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

.animate-pulse { animation: pulse 2s ease-in-out infinite; }
.animate-bounce { animation: bounce 1s ease-in-out infinite; }
.animate-spin { animation: spin 1s linear infinite; }

/* Stagger delays for children */
.stagger > *:nth-child(1) { animation-delay: 0ms; }
.stagger > *:nth-child(2) { animation-delay: 80ms; }
.stagger > *:nth-child(3) { animation-delay: 160ms; }
.stagger > *:nth-child(4) { animation-delay: 240ms; }
.stagger > *:nth-child(5) { animation-delay: 320ms; }
.stagger > *:nth-child(6) { animation-delay: 400ms; }
.stagger > *:nth-child(7) { animation-delay: 480ms; }
.stagger > *:nth-child(8) { animation-delay: 560ms; }
.stagger > *:nth-child(9) { animation-delay: 640ms; }
.stagger > *:nth-child(10) { animation-delay: 720ms; }
.stagger > *:nth-child(11) { animation-delay: 800ms; }
.stagger > *:nth-child(12) { animation-delay: 880ms; }
.stagger > *:nth-child(13) { animation-delay: 960ms; }
.stagger > *:nth-child(14) { animation-delay: 1040ms; }
.stagger > *:nth-child(15) { animation-delay: 1120ms; }

/* Intersection Observer reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* --- Utility --- */
.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;
}

.hidden { display: none !important; }
.visible { display: block; }
.overflow-hidden { overflow: hidden; }
.relative { position: relative; }
.w-full { width: 100%; }

/* --- Responsive: 640px (small tablets, large phones) --- */
@media (min-width: 640px) {
  .subjects-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .pricing-card--featured {
    transform: scale(1.05);
  }

  .pricing-card--featured:hover {
    transform: scale(1.05) translateY(-4px);
  }

  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer__top {
    grid-template-columns: repeat(2, 1fr);
  }

  .hero__title {
    font-size: var(--text-5xl);
  }
}

/* --- Responsive: 768px (tablets) --- */
@media (min-width: 768px) {
  .section {
    padding: var(--space-4xl) 0;
  }

  .section__title {
    font-size: var(--text-4xl);
  }

  .subjects-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-lg);
  }

  .steps {
    flex-direction: row;
    gap: var(--space-lg);
  }

  .step {
    flex: 1;
    flex-direction: column;
    text-align: center;
    align-items: center;
  }

  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .footer__top {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }

  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }

  .hero__stats {
    gap: var(--space-2xl);
  }

  .toast {
    min-width: 360px;
  }
}

/* --- Responsive: 1024px (desktop) --- */
@media (min-width: 1024px) {
  .container {
    padding: 0 var(--space-xl);
  }

  .header__nav {
    display: flex;
  }

  .header__actions {
    display: flex;
  }

  .header__hamburger {
    display: none;
  }

  .hero__content {
    max-width: 800px;
  }

  .hero__title {
    font-size: var(--text-6xl);
  }

  .subjects-grid {
    grid-template-columns: repeat(5, 1fr);
  }

  .features-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
  }

  .testimonials-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-xl);
  }
}

/* --- Print Styles --- */
@media print {
  .header,
  .footer,
  .hero__ctas,
  .mobile-menu,
  .toast-container {
    display: none;
  }

  body {
    color: #000;
    background: #fff;
  }
}

/* --- Accessibility: Reduced Motion --- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}