/* ============================================
   ENHANCED DESIGN SYSTEM - CSS IMPROVEMENTS
   ============================================ */

/* ============================================
   COLOR VARIABLES
   ============================================ */

:root {
  font-family: var(--font-sans);

  /* Primary Colors */
  --color-primary: #0891B2;
  --color-primary-dark: #0E7490;
  --color-primary-light: #CFFAFE;

  /* Status Colors */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;

  /* Neutral Colors */
  --color-text-primary: #1f2937;
  --color-text-secondary: #6b7280;
  --color-border: #e5e7eb;
  --color-bg: #f9fafb;
  --color-bg-card: #ffffff;

  /* Typography */
  --font-sans: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-md: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;
  --weight-black: 800;
  --leading-tight: 1.15;
  --leading-normal: 1.4;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --section-gap: 1.25rem;

  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.25rem;
  --radius-card: 18px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);

  /* Motion */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --duration-fast: 140ms;
  --duration-normal: 220ms;
  --duration-slow: 320ms;

  /* Transitions (legacy aliases) */
  --transition-fast: var(--duration-fast) var(--ease-out);
  --transition-normal: var(--duration-normal) var(--ease-out);
  --transition-slow: var(--duration-slow) var(--ease-out);

  /* Badge/Chip */
  --chip-radius: 9999px;
  --chip-padding: 0.25rem 0.6rem;
  --chip-font: 0.70rem;
  --chip-border: rgba(148, 163, 184, 0.35);
  --chip-bg: rgba(255, 255, 255, 0.7);
  --chip-bg-dark: rgba(17, 24, 39, 0.45);
  --chip-text: rgba(15, 23, 42, 0.82);
  --chip-text-dark: rgba(243, 244, 246, 0.92);
  --chip-shadow: 0 6px 16px rgba(15, 23, 42, 0.08);
  --chip-shadow-dark: 0 10px 20px rgba(0, 0, 0, 0.35);
  --chip-backdrop: blur(10px) saturate(145%);
  --chip-border-dark: rgba(75, 85, 99, 0.55);
  --chip-focus: rgba(59, 130, 246, 0.18);
  --chip-focus-dark: rgba(96, 165, 250, 0.22);

  /* Card */
  --card-padding: 1.25rem;
  --card-padding-sm: 1rem;
  --card-border: rgba(148, 163, 184, 0.22);
  --card-border-dark: rgba(75, 85, 99, 0.55);
  --card-shadow: 0 14px 30px rgba(15, 23, 42, 0.08);
  --card-shadow-dark: 0 18px 38px rgba(0, 0, 0, 0.35);
  --card-bg: rgba(255, 255, 255, 0.88);
  --card-bg-dark: rgba(31, 41, 55, 0.88);
  --card-backdrop: blur(12px) saturate(145%);
  --card-hover-raise: translateY(-1px);
  --card-active-press: scale(0.99);

  /* Table */
  --table-radius: 14px;
  --table-row-hover: rgba(59, 130, 246, 0.04);
  --table-row-hover-dark: rgba(96, 165, 250, 0.08);

  /* Focus */
  --focus-ring: 0 0 0 3px rgba(59, 130, 246, 0.18);
  --focus-ring-dark: 0 0 0 3px rgba(96, 165, 250, 0.22);

  /* Surface */
  --surface-glass: rgba(255, 255, 255, 0.72);
  --surface-glass-dark: rgba(17, 24, 39, 0.52);
  --surface-shadow: 0 -8px 30px rgba(30, 64, 175, 0.15);
  --surface-shadow-dark: 0 -10px 32px rgba(0, 0, 0, 0.45);

  /* Buttons */
  --btn-radius: 14px;
  --btn-shadow: 0 10px 20px rgba(37, 99, 235, 0.16);
  --btn-shadow-dark: 0 14px 22px rgba(0, 0, 0, 0.4);
  --btn-press: scale(0.99);

  /* Page */
  --page-enter: premiumFadeUp var(--transition-normal);
  --page-enter-desktop: premiumFadeUp var(--transition-normal);

  /* Nav */
  --nav-height: 74px;
  --nav-bg: var(--surface-glass);
  --nav-bg-dark: var(--surface-glass-dark);
  --nav-shadow: var(--surface-shadow);
  --nav-shadow-dark: var(--surface-shadow-dark);

  /* Sidebar */
  --sidebar-grad: linear-gradient(180deg, #08203f 0%, #123b6d 60%, #0e7490 100%);
  --sidebar-border: rgba(255, 255, 255, 0.12);
  --sidebar-shadow: 8px 0 28px rgba(15, 23, 42, 0.22);

  /* Header */
  --header-grad: linear-gradient(120deg, #2f62ff, #2f7bff 50%, #17c4b5);
  --header-shadow: 0 10px 30px rgba(37, 99, 235, 0.12);

  /* Avatar */
  --avatar-shadow: 0 10px 25px rgba(15, 23, 42, 0.12);

  /* Inputs */
  --input-radius: 14px;
  --input-bg: rgba(255, 255, 255, 0.92);
  --input-bg-dark: rgba(31, 41, 55, 0.92);
  --input-border: rgba(148, 163, 184, 0.35);
  --input-border-dark: rgba(75, 85, 99, 0.55);
  --input-shadow: 0 8px 18px rgba(15, 23, 42, 0.06);

  /* Icons */
  --icon-size: 20px;
  --icon-stroke: 2;

  /* Tooltip */
  --tooltip-bg: rgba(15, 23, 42, 0.9);
  --tooltip-bg-dark: rgba(255, 255, 255, 0.9);

  /* Modal */
  --modal-radius: 18px;
  --modal-shadow: 0 24px 60px rgba(0, 0, 0, 0.18);

  /* Layout */
  --layout-max: 80rem;

  /* Compatibility */
  --premium-grad-start: #2f62ff;
  --premium-grad-mid: #2f7bff;
  --premium-grad-end: #17c4b5;
  --premium-glass: rgba(255, 255, 255, 0.72);
  --premium-glass-dark: rgba(17, 24, 39, 0.52);
  --premium-shadow-soft: 0 10px 30px rgba(37, 99, 235, 0.12);
  --premium-shadow-card: 0 12px 28px rgba(15, 23, 42, 0.08);

  /* Legacy */
  --legacy-transition-fast: 0.15s ease-in-out;
  --legacy-transition-normal: 0.2s ease-in-out;
  --legacy-transition-slow: 0.3s ease-in-out;
}

.dark {
  --color-text-primary: #f3f4f6;
  --color-text-secondary: #d1d5db;
  --color-border: #374151;
  --color-bg: #111827;
  --color-bg-card: #1f2937;
}

/* ============================================
   BUTTON STYLES - ENHANCED
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-normal);
  outline: none;
  position: relative;
}

.btn:focus {
  outline: 2px solid;
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

/* Primary Button */
.btn-primary {
  background-color: var(--color-primary);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-primary-dark);
  box-shadow: var(--shadow-lg);
  transform: translateY(-1px);
}

.btn-primary:active:not(:disabled) {
  transform: translateY(0);
}

.btn-primary:focus {
  outline-color: var(--color-primary);
}

/* Secondary Button */
.btn-secondary {
  background-color: #e5e7eb;
  color: #1f2937;
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover:not(:disabled) {
  background-color: #d1d5db;
  box-shadow: var(--shadow-md);
}

.dark .btn-secondary {
  background-color: #374151;
  color: #f3f4f6;
}

.dark .btn-secondary:hover:not(:disabled) {
  background-color: #4b5563;
}

/* Danger Button */
.btn-danger {
  background-color: var(--color-error);
  color: white;
  box-shadow: var(--shadow-md);
}

.btn-danger:hover:not(:disabled) {
  background-color: #dc2626;
  box-shadow: var(--shadow-lg);
}

.btn-danger:focus {
  outline-color: var(--color-error);
}

/* ============================================
   FORM INPUTS - ENHANCED
   ============================================ */

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.form-label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.form-label .required {
  color: var(--color-error);
}

.form-input,
.form-select,
.form-textarea {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 2px solid var(--color-border);
  border-radius: var(--radius-lg);
  font-size: 1rem;
  font-family: inherit;
  background-color: var(--color-bg-card);
  color: var(--color-text-primary);
  transition: all var(--transition-normal);
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(8, 145, 178, 0.15);
  outline: none;
}

.form-input:disabled,
.form-select:disabled,
.form-textarea:disabled {
  background-color: #f3f4f6;
  cursor: not-allowed;
  opacity: 0.6;
}

.dark .form-input,
.dark .form-select,
.dark .form-textarea {
  background-color: #374151;
  border-color: #4b5563;
  color: #f3f4f6;
}

.dark .form-input:focus,
.dark .form-select:focus,
.dark .form-textarea:focus {
  box-shadow: 0 0 0 4px rgba(34, 211, 238, 0.25);
}

.form-input.error,
.form-select.error,
.form-textarea.error {
  border-color: var(--color-error);
}

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

.form-hint {
  font-size: 0.75rem;
  color: var(--color-text-secondary);
}

.form-error {
  font-size: 0.75rem;
  color: var(--color-error);
  font-weight: 500;
  display: none;
  margin-top: 0.25rem;
}

.form-error.show {
  display: block;
  animation: slideInUp var(--transition-fast);
}

.form-success {
  font-size: 0.75rem;
  color: var(--color-success);
  font-weight: 500;
  display: none;
  margin-top: 0.25rem;
}

.form-success.show {
  display: block;
  animation: slideInUp var(--transition-fast);
}

/* Input with success state */
.form-input.success,
.form-select.success,
.form-textarea.success {
  border-color: var(--color-success);
}

.form-input.success:focus,
.form-select.success:focus,
.form-textarea.success:focus {
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.1);
}

/* Input with warning state */
.form-input.warning,
.form-select.warning,
.form-textarea.warning {
  border-color: var(--color-warning);
}

.form-input.warning:focus,
.form-select.warning:focus,
.form-textarea.warning:focus {
  box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.1);
}

/* Dark mode error states */
.dark .form-input.error,
.dark .form-select.error,
.dark .form-textarea.error {
  border-color: #f87171;
}

.dark .form-input.error:focus,
.dark .form-select.error:focus,
.dark .form-textarea.error:focus {
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.2);
}

/* Dark mode success states */
.dark .form-input.success,
.dark .form-select.success,
.dark .form-textarea.success {
  border-color: #6ee7b7;
}

.dark .form-input.success:focus,
.dark .form-select.success:focus,
.dark .form-textarea.success:focus {
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.2);
}

/* ============================================
   CARD COMPONENTS - ENHANCED
   ============================================ */

.card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: all var(--transition-normal);
  overflow: hidden;
}

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

.card-header {
  padding: 1.5rem;
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-bg);
}

.card-body {
  padding: 1.5rem;
}

.card-footer {
  padding: 1.5rem;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg);
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
}

.card-elevated {
  box-shadow: var(--shadow-lg);
}

.card-outlined {
  border: 2px solid var(--color-primary);
  box-shadow: none;
}

.card-flat {
  box-shadow: none;
}

/* ============================================
   NAVIGATION BUTTONS - ENHANCED
   ============================================ */

.nav-btn {
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  font-weight: 600;
  font-size: 0.875rem;
  border: 1px solid var(--color-border);
  background-color: var(--color-bg-card);
  color: var(--color-text-primary);
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
}

.nav-btn:hover {
  background-color: var(--color-bg);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

/* Answered State */
.nav-btn.answered {
  background-color: #d1fae5;
  color: #065f46;
  border-color: #6ee7b7;
}

.nav-btn.answered:hover {
  background-color: #a7f3d0;
}

/* Marked State */
.nav-btn.marked {
  background-color: #fef3c7;
  color: #92400e;
  border-color: #fcd34d;
}

.nav-btn.marked:hover {
  background-color: #fde68a;
}

/* Current State */
.nav-btn.current {
  background-color: var(--color-primary);
  color: white;
  border-color: var(--color-primary-dark);
  box-shadow: 0 4px 12px rgba(59, 130, 246, 0.4);
}

.nav-btn.current:hover {
  background-color: var(--color-primary-dark);
  box-shadow: 0 6px 16px rgba(59, 130, 246, 0.5);
}

/* Dark Mode */
.dark .nav-btn {
  background-color: #374151;
  color: #d1d5db;
  border-color: #4b5563;
}

.dark .nav-btn:hover {
  background-color: #4b5563;
}

/* ============================================
   MODAL DIALOG - ENHANCED
   ============================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 50;
  padding: 1rem;
  animation: fadeIn var(--transition-normal);
}

.modal-content {
  background-color: var(--color-bg-card);
  border-radius: var(--radius-2xl);
  box-shadow: var(--shadow-xl);
  max-width: 42rem;
  width: 100%;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideInUp var(--transition-slow);
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.5rem;
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  background-color: var(--color-bg-card);
  z-index: 10;
}

.modal-title {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.modal-close {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: color var(--transition-normal);
  padding: 0.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.modal-close:hover {
  color: var(--color-text-primary);
}

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

.modal-body {
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.modal-footer {
  display: flex;
  justify-content: flex-end;
  gap: 1rem;
  padding: 1.5rem;
  border-top: 1px solid var(--color-border);
  background-color: var(--color-bg);
  position: sticky;
  bottom: 0;
}

/* ============================================
   ANIMATIONS - ENHANCED
   ============================================ */

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

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

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

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

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

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

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

.fade-in {
  animation: fadeIn var(--transition-normal);
}

.slide-in-up {
  animation: slideInUp var(--transition-slow);
}

.slide-in-right {
  animation: slideInRight var(--transition-normal);
}

.slide-in-left {
  animation: slideInLeft var(--transition-normal);
}

.loading {
  position: relative;
  color: transparent;
}

.loading::after {
  content: '';
  position: absolute;
  width: 1rem;
  height: 1rem;
  top: 50%;
  left: 50%;
  margin-left: -0.5rem;
  margin-top: -0.5rem;
  border: 2px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: white;
  animation: spin 1s ease-in-out infinite;
}

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

@media (max-width: 640px) {
  .modal-content {
    max-width: 100%;
    border-radius: var(--radius-xl);
  }

  .modal-header,
  .modal-body,
  .modal-footer {
    padding: 1rem;
  }

  .btn {
    padding: 0.625rem 1rem;
    font-size: 0.875rem;
  }

  .card-header,
  .card-body,
  .card-footer {
    padding: 1rem;
  }
}

/* ============================================
   ACCESSIBILITY
   ============================================ */

/* Focus visible for keyboard navigation */
*:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
}

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

/* ============================================
   MOBILE OPTIMIZATION
   ============================================ */

/* Touch-friendly button sizing */
@media (max-width: 768px) {
  .btn {
    min-height: 44px;
    min-width: 44px;
    padding: 0.875rem 1.25rem;
  }

  .nav-btn {
    width: 2.75rem;
    height: 2.75rem;
    font-size: 0.8rem;
  }

  .modal-content {
    max-width: 95vw;
    max-height: 95vh;
  }

  .modal-header,
  .modal-body,
  .modal-footer {
    padding: 1rem;
  }

  .form-input,
  .form-select,
  .form-textarea {
    font-size: 16px;
  }

  .card {
    border-radius: var(--radius-lg);
  }

  .card-header,
  .card-body,
  .card-footer {
    padding: 1rem;
  }
}

/* Extra small devices (375px) */
@media (max-width: 375px) {
  .btn {
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
  }

  .modal-content {
    max-width: 100%;
    border-radius: var(--radius-lg);
  }

  .nav-btn {
    width: 2.5rem;
    height: 2.5rem;
    font-size: 0.75rem;
  }

  .form-label {
    font-size: 0.8125rem;
  }

  .form-input,
  .form-select,
  .form-textarea {
    padding: 0.625rem 0.875rem;
    font-size: 16px;
  }

  .card-header,
  .card-body,
  .card-footer {
    padding: 0.875rem;
  }
}

/* Landscape orientation optimization */
@media (max-height: 500px) and (orientation: landscape) {
  .modal-content {
    max-height: 90vh;
  }

  .form-group {
    margin-bottom: 0.75rem;
  }

  .btn {
    padding: 0.5rem 1rem;
  }
}

/* High DPI screens (retina) */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
  .btn,
  .form-input,
  .form-select,
  .form-textarea,
  .card,
  .nav-btn {
    border-width: 1px;
  }
}

/* Touch device optimizations */
@media (hover: none) and (pointer: coarse) {
  .btn:hover {
    transform: none;
  }

  .nav-btn:hover {
    transform: none;
  }

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

  /* Increase touch target size */
  button,
  a,
  input[type="checkbox"],
  input[type="radio"] {
    min-height: 44px;
    min-width: 44px;
  }
}

/* Reduce animations on mobile */
@media (max-width: 768px) {
  .modal-overlay {
    animation: fadeIn 0.1s ease-in-out;
  }

  .modal-content {
    animation: slideInUp 0.15s ease-in-out;
  }

  .btn {
    transition: background-color 0.1s ease-in-out;
  }
}

/* High contrast mode support */
@media (prefers-contrast: more) {
  .btn,
  .form-input,
  .card,
  .nav-btn {
    border-width: 2px;
  }
}

/* ============================================
   DARK MODE ENHANCEMENTS
   ============================================ */

.dark .card {
  background-color: #1f2937;
  border-color: #374151;
}

.dark .card-header,
.dark .card-footer {
  background-color: #111827;
}

.dark .modal-content {
  background-color: #1f2937;
}

.dark .modal-header,
.dark .modal-footer {
  background-color: #111827;
}

/* ============================================
   MOBILE BOTTOM NAVIGATION
   ============================================ */

.mobile-bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background-color: var(--nav-bg);
  backdrop-filter: var(--chip-backdrop);
  -webkit-backdrop-filter: var(--chip-backdrop);
  border-top: 1px solid var(--chip-border);
  display: flex !important;
  justify-content: space-around;
  align-items: center;
  z-index: 9999;
  box-shadow: var(--nav-shadow);
  padding: 0 0.35rem;
}

@media (min-width: 768px) {
  .mobile-bottom-nav {
    display: none !important;
  }
}

.dark .mobile-bottom-nav {
  background-color: rgba(31, 41, 55, 0.96);
  border-top-color: #374151;
  box-shadow: 0 -6px 18px rgba(0, 0, 0, 0.35);
}

.mobile-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.15rem;
  padding: 0.25rem 0.35rem;
  cursor: pointer;
  color: var(--color-text-secondary);
  transition: transform var(--transition-normal), color var(--transition-normal);
  min-width: 48px;
  min-height: 48px;
  border: none;
  background: none;
  font-family: var(--font-sans);
  font-size: var(--text-xs);
}

.mobile-nav-item:active {
  transform: scale(0.95);
}

.mobile-nav-icon-wrap {
  width: 30px;
  height: 30px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 9999px;
  transition: all var(--transition-normal);
}

.mobile-nav-item svg {
  width: 21px;
  height: 21px;
  stroke-width: 2;
}

.mobile-nav-item.active {
  color: var(--color-primary);
  font-weight: 700;
}

.mobile-nav-item.active .mobile-nav-icon-wrap {
  background-color: rgba(8, 145, 178, 0.22);
  box-shadow: 0 2px 8px rgba(8, 145, 178, 0.28);
  transform: scale(1.08);
}

.mobile-nav-item.active::before {
  content: '';
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 28px;
  height: 3px;
  border-radius: 0 0 4px 4px;
  background: linear-gradient(135deg, #22D3EE, #0891B2);
}

.mobile-nav-item {
  position: relative;
}

.mobile-nav-item-center {
  transform: translateY(-12px);
}

.mobile-nav-icon-wrap-center {
  width: 52px;
  height: 52px;
  background: linear-gradient(135deg, #22D3EE, #0891B2);
  color: #fff;
  box-shadow: 0 8px 16px rgba(8, 145, 178, 0.35);
}

.mobile-nav-item-center svg {
  width: 24px;
  height: 24px;
  stroke-width: 2.4;
}

.mobile-nav-item-center.active .mobile-nav-icon-wrap-center {
  background: linear-gradient(135deg, #0E7490, #164E63);
}

.dark .mobile-nav-item {
  color: #9ca3af;
}

.dark .mobile-nav-item.active {
  color: #67E8F9;
}

.dark .mobile-nav-item.active .mobile-nav-icon-wrap {
  background-color: rgba(34, 211, 238, 0.18);
}

.dark .mobile-nav-icon-wrap-center {
  box-shadow: 0 8px 18px rgba(14, 165, 233, 0.45);
}

/* Add padding to main content on mobile to avoid bottom nav overlap */
@media (max-width: 767px) {
  main, .flex-1 {
    padding-bottom: 80px;
  }

  .app-container > div {
    padding-bottom: 80px;
  }
}

.mobile-nav-badge {
  position: absolute;
  top: 1px;
  right: -1px;
  width: 8px;
  height: 8px;
  border-radius: 9999px;
  background-color: #ef4444;
  border: 1.5px solid #fff;
  box-shadow: 0 0 0 2px rgba(239, 68, 68, 0.18);
}

.dark .mobile-nav-badge {
  border-color: #1f2937;
}

.page-transition-enter {
  animation: mobilePageEnter 220ms ease-out;
}

@keyframes mobilePageEnter {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.mobile-tap-ripple {
  position: relative;
  overflow: hidden;
}

.mobile-tap-ripple::after {
  content: '';
  position: absolute;
  width: 10px;
  height: 10px;
  border-radius: 9999px;
  background: rgba(59, 130, 246, 0.2);
  transform: scale(0);
  opacity: 0;
  pointer-events: none;
}

.mobile-tap-ripple:active::after {
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%) scale(8);
  opacity: 1;
  transition: transform 260ms ease-out, opacity 360ms ease-out;
}

.dark .mobile-tap-ripple:active::after {
  background: rgba(147, 197, 253, 0.22);
}

/* ============================================
   PREMIUM MOBILE POLISH (2026)
   ============================================ */

:root {
  --premium-grad-start: #2f62ff;
  --premium-grad-mid: #2f7bff;
  --premium-grad-end: #17c4b5;
  --premium-glass: rgba(255, 255, 255, 0.72);
  --premium-glass-dark: rgba(17, 24, 39, 0.52);
  --premium-shadow-soft: 0 10px 30px rgba(37, 99, 235, 0.12);
  --premium-shadow-card: 0 12px 28px rgba(15, 23, 42, 0.08);
}

body {
  font-family: var(--font-sans);
  background:
    radial-gradient(circle at 20% -10%, rgba(47, 98, 255, 0.10), transparent 45%),
    radial-gradient(circle at 95% 5%, rgba(23, 196, 181, 0.12), transparent 40%),
    linear-gradient(180deg, #f7fbff 0%, #eef3fb 52%, #e8edf6 100%);
}

.dark body {
  background: linear-gradient(180deg, #0b1220 0%, #111827 100%);
}

@media (max-width: 767px) {
  .premium-card,
  .home-menu-card,
  .modal-content {
    border-radius: 18px;
    box-shadow: var(--premium-shadow-card);
  }

  .exam-page .exam-header {
    padding: 0.65rem 0.8rem !important;
  }

  .exam-page .exam-timer-box {
    min-width: 82px;
    padding: 0.5rem 0.6rem !important;
    border-radius: 12px;
  }

  .exam-page #timer {
    font-size: 2rem;
    letter-spacing: 0.06em;
  }

  .exam-page .exam-finish-btn {
    min-height: 42px;
    padding: 0.55rem 0.8rem !important;
    border-radius: 12px;
    font-size: 0.8rem;
  }

  .exam-page .exam-main-wrap {
    padding: 0.8rem !important;
    gap: 0.75rem !important;
  }

  .exam-page main .card {
    padding: 1rem !important;
    min-height: 420px;
    border-radius: 16px;
  }

  .exam-page main .card h2 {
    font-size: 2rem;
    gap: 0.45rem;
  }

  .exam-page main .card h2 span {
    font-size: 0.78rem;
    padding: 0.35rem 0.6rem;
    border-radius: 10px;
  }

  .exam-page .option-label {
    padding: 0.75rem !important;
    border-radius: 11px;
  }

  .exam-page .exam-option {
    cursor: pointer;
    transition: transform 160ms ease, border-color 180ms ease, background-color 180ms ease, box-shadow 180ms ease;
  }

  .exam-page .exam-option:active {
    transform: scale(0.985);
  }

  .exam-page .exam-option.selected {
    box-shadow: 0 10px 24px rgba(37, 99, 235, 0.16);
  }

  .dark .exam-page .exam-option.selected {
    box-shadow: 0 10px 24px rgba(37, 99, 235, 0.28);
  }

  .exam-page .option-label span.w-8.h-8 {
    width: 34px;
    height: 34px;
    margin-right: 0.65rem;
  }

  .exam-page .option-label span.mt-1 {
    margin-top: 0.15rem;
    font-size: 1rem;
  }

  .exam-page main .card > .exam-cta {
    margin-top: 0.9rem;
    padding-top: 0.85rem;
    gap: 0.6rem;
  }

  .exam-page main {
    padding-bottom: calc(92px + env(safe-area-inset-bottom, 0px));
  }

  .exam-page .exam-cta {
    display: none !important;
  }

  /* Mobile action bar — fixed bottom navigation untuk ujian */
  .exam-mobile-action-bar {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    z-index: 50;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.5rem;
    padding: 0.65rem 1rem calc(0.65rem + env(safe-area-inset-bottom, 0px));
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px) saturate(150%);
    -webkit-backdrop-filter: blur(12px) saturate(150%);
    border-top: 1px solid rgba(148, 163, 184, 0.25);
    box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.08);
  }

  .dark .exam-mobile-action-bar {
    background: rgba(17, 24, 39, 0.95);
    border-top-color: rgba(75, 85, 99, 0.4);
    box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.3);
  }

  .exam-mobile-action-btn {
    flex: 1;
    min-height: 44px;
    padding: 0.55rem 0.75rem;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: 700;
    border: 1.5px solid #e2e8f0;
    background: #f8fafc;
    color: #374151;
    cursor: pointer;
    transition: all 160ms ease;
    text-align: center;
  }

  .dark .exam-mobile-action-btn {
    background: #1f2937;
    border-color: #374151;
    color: #d1d5db;
  }

  .exam-mobile-action-btn:active {
    transform: scale(0.97);
  }

  .exam-mobile-action-btn.primary {
    background: linear-gradient(135deg, #0891B2, #0E7490);
    border-color: transparent;
    color: #fff;
    box-shadow: 0 4px 12px rgba(8, 145, 178, 0.3);
  }

  .exam-mobile-action-btn.danger {
    background: linear-gradient(135deg, #dc2626, #b91c1c);
    border-color: transparent;
    color: #fff;
    box-shadow: 0 4px 12px rgba(220, 38, 38, 0.3);
  }

  .exam-mobile-action-btn.marked {
    background: #fef3c7;
    border-color: #f59e0b;
    color: #92400e;
  }

  .dark .exam-mobile-action-btn.marked {
    background: #451a03;
    border-color: #d97706;
    color: #fcd34d;
  }

  .exam-mobile-action-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
  }

  /* Tambah padding bawah konten supaya tidak tertutup action bar */
  .exam-page main {
    padding-bottom: calc(80px + env(safe-area-inset-bottom, 0px)) !important;
  }

  .exam-page .exam-cta > div {
    display: none;
  }

  .exam-page main .card > .flex.flex-wrap .btn {
    min-height: 40px;
    font-size: 0.84rem;
    padding: 0.55rem 0.85rem;
    border-radius: 12px;
  }

  .exam-page aside .card {
    padding: 0.9rem !important;
    border-radius: 14px;
  }

  .exam-page #mobile-nav-content .grid {
    gap: 0.4rem;
    margin-bottom: 0.9rem;
  }

  .exam-page .nav-btn {
    width: 2.45rem;
    height: 2.45rem;
    font-size: 0.76rem;
    border-radius: 10px;
  }
}

@media (max-width: 420px) {
  .exam-page .exam-header {
    padding: 0.55rem 0.65rem !important;
  }

  .exam-page #timer {
    font-size: 1.9rem;
  }

  .exam-page .exam-main-wrap {
    padding: 0.65rem !important;
  }

  .exam-page main .card {
    padding: 0.85rem !important;
  }
}

@media (max-width: 767px) {
  .premium-card,
  .home-menu-card,
  .modal-content {
    border-radius: 18px;
    box-shadow: var(--premium-shadow-card);
  }

  .bg-gradient-to-r.from-blue-600.to-indigo-600 {
    background-image: linear-gradient(120deg, var(--premium-grad-start), var(--premium-grad-mid) 50%, var(--premium-grad-end));
    box-shadow: var(--premium-shadow-soft);
  }

  .mobile-bottom-nav {
    height: 68px;
    border-top: 1px solid rgba(148, 163, 184, 0.22);
    background: rgba(255, 255, 255, 0.88);
    backdrop-filter: blur(16px) saturate(150%);
    -webkit-backdrop-filter: blur(16px) saturate(150%);
    box-shadow: 0 -6px 22px rgba(30, 64, 175, 0.12);
    padding: 0 0.2rem;
  }

  .dark .mobile-bottom-nav {
    background: rgba(17, 24, 39, 0.86);
    border-top-color: rgba(75, 85, 99, 0.45);
  }

  .mobile-nav-item {
    gap: 0.1rem;
    padding: 0.2rem 0.25rem;
    transition: transform 200ms ease, color 220ms ease;
  }

  .mobile-nav-item span:last-child {
    font-size: 0.68rem;
  }

  .mobile-nav-item.active {
    transform: translateY(-1px);
  }

  .mobile-nav-icon-wrap-center {
    width: 48px;
    height: 48px;
    background: linear-gradient(135deg, var(--premium-grad-start), var(--premium-grad-end));
    box-shadow: 0 8px 18px rgba(37, 99, 235, 0.34);
  }

  .rounded-xl,
  .rounded-2xl {
    border-radius: 18px !important;
  }

  .mobile-tap-ripple,
  .btn,
  button {
    transition: transform 160ms ease, box-shadow 220ms ease, background-color 220ms ease;
  }

  .mobile-tap-ripple:active,
  .btn:active,
  button:active {
    transform: scale(0.985);
  }

  .page-transition-enter,
  .premium-card,
  .home-menu-card {
    animation: premiumFadeUp 260ms ease-out;
  }

  main {
    padding: 0.85rem !important;
  }

  .max-w-6xl,
  .max-w-7xl {
    gap: 0.85rem;
  }

  .premium-card {
    padding: 1rem;
  }

  .premium-card.p-6,
  .premium-card.p-5 {
    padding: 1rem !important;
  }

  .premium-card.p-4 {
    padding: 0.9rem !important;
  }

  .admin-title-card {
    min-height: 100px;
  }

  .admin-title-card h2 {
    font-size: 1.9rem;
    margin-bottom: 0.2rem;
  }

  .admin-stat-card {
    min-height: 104px;
    padding: 1rem !important;
  }

  .admin-stat-card .text-3xl {
    font-size: 2rem;
    line-height: 1;
  }

  #exam-health-check .premium-empty {
    min-height: 7rem;
    padding: 1rem;
  }

  #exam-health-check button,
  .admin-stat-card button {
    min-height: 40px;
  }
}

@keyframes premiumFadeUp {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ============================================
   FINAL 10/10 DESIGN PASS
   ============================================ */

:where(.premium-card, .home-menu-card, .modal-content) {
  backdrop-filter: var(--card-backdrop);
  -webkit-backdrop-filter: var(--card-backdrop);
}

:where(.premium-chip, .rounded-full, [class*="rounded-full"]) {
  letter-spacing: 0.01em;
}

:where(.premium-chip, span[class*="rounded-full"], .mobile-nav-badge) {
  box-shadow: var(--chip-shadow);
}

.dark :where(.premium-chip, span[class*="rounded-full"], .mobile-nav-badge) {
  box-shadow: var(--chip-shadow-dark);
}

:where(button, .btn, input, select, textarea) {
  font-family: var(--font-sans);
}

:where(button, .btn) {
  border-radius: var(--btn-radius);
}

:where(input, select, textarea, .form-input, .form-select, .form-textarea) {
  border-radius: var(--input-radius);
}

:where(button, a, input, select, textarea):focus-visible {
  outline: none;
  box-shadow: var(--focus-ring);
}

.dark :where(button, a, input, select, textarea):focus-visible {
  box-shadow: var(--focus-ring-dark);
}

:where(h1, h2, h3) {
  letter-spacing: -0.025em;
  line-height: var(--leading-tight);
}

:where(p, span, label, input, select, textarea, button) {
  line-height: var(--leading-normal);
}

@media (max-width: 767px) {
  main > div,
  .max-w-6xl,
  .max-w-7xl {
    gap: var(--section-gap);
  }

  :where(.premium-card, .home-menu-card, .modal-content) {
    background-color: var(--card-bg);
    border-color: var(--card-border);
  }

  .dark :where(.premium-card, .home-menu-card, .modal-content) {
    background-color: var(--card-bg-dark);
    border-color: var(--card-border-dark);
  }
}

/* ============================================
   PRODUCTION COMPONENT CLASSES
   ============================================ */

.premium-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius-card);
  box-shadow: var(--card-shadow);
  backdrop-filter: var(--card-backdrop);
  -webkit-backdrop-filter: var(--card-backdrop);
}

.dark .premium-card {
  background: var(--card-bg-dark);
  border-color: var(--card-border-dark);
  box-shadow: var(--card-shadow-dark);
}

.premium-hero {
  background: var(--header-grad);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 22px;
  box-shadow: var(--header-shadow);
  color: #fff;
  position: relative;
  overflow: hidden;
}

.premium-hero::after {
  content: '';
  position: absolute;
  right: -8%;
  top: -35%;
  width: 260px;
  height: 260px;
  border-radius: 9999px;
  background: rgba(255, 255, 255, 0.14);
  pointer-events: none;
}

.premium-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: var(--chip-padding);
  border-radius: var(--chip-radius);
  border: 1px solid var(--chip-border);
  background: var(--chip-bg);
  color: var(--chip-text);
  font-size: var(--chip-font);
  font-weight: var(--weight-bold);
  letter-spacing: 0.01em;
  box-shadow: var(--chip-shadow);
  backdrop-filter: var(--chip-backdrop);
  -webkit-backdrop-filter: var(--chip-backdrop);
}

.dark .premium-chip {
  border-color: var(--chip-border-dark);
  background: var(--chip-bg-dark);
  color: var(--chip-text-dark);
  box-shadow: var(--chip-shadow-dark);
}

.premium-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 0.6rem 1rem;
  border-radius: var(--btn-radius);
  font-weight: var(--weight-bold);
  box-shadow: var(--btn-shadow);
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), background-color var(--transition-normal);
}

.premium-action:hover {
  transform: translateY(-1px);
}

.premium-action:active {
  transform: var(--btn-press);
}

.premium-empty {
  min-height: 9rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  gap: 0.55rem;
  padding: 1.5rem;
  border-radius: var(--radius-card);
  border: 1px dashed var(--card-border);
  background: rgba(255, 255, 255, 0.54);
  color: var(--color-text-secondary);
}

.dark .premium-empty {
  border-color: var(--card-border-dark);
  background: rgba(31, 41, 55, 0.44);
}

.premium-empty-icon {
  width: 42px;
  height: 42px;
  border-radius: 14px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(47, 98, 255, 0.14), rgba(23, 196, 181, 0.14));
  color: var(--color-primary);
}

.premium-table {
  border-radius: var(--table-radius);
  overflow: hidden;
  box-shadow: var(--card-shadow);
}

/* ============================================
   DESKTOP PREMIUM POLISH (2026)
   ============================================ */

@media (min-width: 768px) {
  body {
    background:
      radial-gradient(circle at 12% -8%, rgba(47, 98, 255, 0.10), transparent 40%),
      radial-gradient(circle at 92% 6%, rgba(23, 196, 181, 0.10), transparent 34%),
      linear-gradient(180deg, #f4f8ff 0%, #edf2fb 50%, #e8eef7 100%);
  }

  .dark body {
    background: linear-gradient(180deg, #0b1220 0%, #111827 100%);
  }

  .hidden.md\:flex.w-64,
  aside.w-64.hidden.md\:flex {
    background: linear-gradient(180deg, #08203f 0%, #123b6d 60%, #0e7490 100%) !important;
    border-right: 1px solid rgba(255, 255, 255, 0.12);
    box-shadow: 8px 0 28px rgba(15, 23, 42, 0.22);
  }

  .premium-card,
  .home-menu-card,
  .modal-content {
    border-radius: 18px;
    box-shadow: 0 10px 28px rgba(15, 23, 42, 0.08);
  }

  .dark .premium-card,
  .dark .home-menu-card,
  .dark .modal-content {
    box-shadow: 0 18px 38px rgba(0, 0, 0, 0.35);
  }

  .premium-card.border,
  .home-menu-card.border {
    border-color: rgba(148, 163, 184, 0.28);
  }

  .dark .premium-card.border,
  .dark .home-menu-card.border {
    border-color: rgba(75, 85, 99, 0.55);
  }

  table.w-full {
    border-collapse: separate;
    border-spacing: 0;
    overflow: hidden;
    border-radius: 14px;
  }

  thead.bg-gray-50,
  .dark thead.dark\:bg-gray-700 {
    position: sticky;
    top: 0;
    z-index: 2;
    backdrop-filter: blur(6px);
  }

  tbody tr {
    transition: background-color 180ms ease, transform 180ms ease;
  }

  tbody tr:hover {
    transform: translateY(-1px);
  }

  .rounded-xl,
  .rounded-2xl {
    border-radius: 18px !important;
  }

  button,
  .btn {
    transition: transform 150ms ease, box-shadow 220ms ease, background-color 220ms ease;
  }

  .premium-action:hover,
  .btn:hover,
  button.mobile-tap-ripple:hover {
    transform: translateY(-1px);
  }

  button:active,
  .btn:active {
    transform: translateY(0);
  }
}

/* ============================================
   HOME PAGE MENU CARDS
   ============================================ */

/* ============================================
   HOME PAGE MENU CARDS
   ============================================ */

.home-menu-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  padding: 1.5rem 1rem;
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  cursor: pointer;
  transition: all var(--transition-normal);
  box-shadow: var(--shadow-sm);
  min-height: 140px;
}

.home-menu-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: var(--color-primary);
}

.home-menu-card:active {
  transform: translateY(-2px);
}

.home-menu-icon {
  width: 60px;
  height: 60px;
  border-radius: var(--radius-lg);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-normal);
}

.dark .home-menu-card {
  background-color: #1f2937;
  border-color: #374151;
}

.dark .home-menu-card:hover {
  border-color: #60a5fa;
  background-color: #111827;
}

/* ============================================
   TYPOGRAPHY SYSTEM - ENHANCED
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text-primary);
  margin-bottom: 1rem;
}

h1 {
  font-size: 2rem;
  letter-spacing: -0.02em;
}

h2 {
  font-size: 1.5rem;
  letter-spacing: -0.01em;
}

h3 {
  font-size: 1.25rem;
}

h4 {
  font-size: 1.125rem;
}

h5 {
  font-size: 1rem;
}

h6 {
  font-size: 0.875rem;
}

p {
  line-height: 1.6;
  color: var(--color-text-secondary);
  margin-bottom: 1rem;
}

.text-sm {
  font-size: 0.875rem;
  line-height: 1.5;
}

.text-xs {
  font-size: 0.75rem;
  line-height: 1.5;
}

.text-lg {
  font-size: 1.125rem;
  line-height: 1.75;
}

.text-xl {
  font-size: 1.25rem;
  line-height: 1.75;
}

.font-semibold {
  font-weight: 600;
}

.font-bold {
  font-weight: 700;
}

.uppercase {
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ============================================
   SPACING UTILITIES - ENHANCED
   ============================================ */

.space-y-1 > * + * { margin-top: 0.25rem; }
.space-y-2 > * + * { margin-top: 0.5rem; }
.space-y-3 > * + * { margin-top: 0.75rem; }
.space-y-4 > * + * { margin-top: 1rem; }
.space-y-6 > * + * { margin-top: 1.5rem; }
.space-y-8 > * + * { margin-top: 2rem; }

.gap-1 { gap: 0.25rem; }
.gap-2 { gap: 0.5rem; }
.gap-3 { gap: 0.75rem; }
.gap-4 { gap: 1rem; }
.gap-6 { gap: 1.5rem; }
.gap-8 { gap: 2rem; }

.p-2 { padding: 0.5rem; }
.p-3 { padding: 0.75rem; }
.p-4 { padding: 1rem; }
.p-6 { padding: 1.5rem; }
.p-8 { padding: 2rem; }

.px-2 { padding-left: 0.5rem; padding-right: 0.5rem; }
.px-3 { padding-left: 0.75rem; padding-right: 0.75rem; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.px-6 { padding-left: 1.5rem; padding-right: 1.5rem; }

.py-2 { padding-top: 0.5rem; padding-bottom: 0.5rem; }
.py-3 { padding-top: 0.75rem; padding-bottom: 0.75rem; }
.py-4 { padding-top: 1rem; padding-bottom: 1rem; }
.py-6 { padding-top: 1.5rem; padding-bottom: 1.5rem; }

.mb-1 { margin-bottom: 0.25rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-3 { margin-bottom: 0.75rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }

.mt-1 { margin-top: 0.25rem; }
.mt-2 { margin-top: 0.5rem; }
.mt-3 { margin-top: 0.75rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }

/* ============================================
   CARD COMPONENT - ENHANCED
   ============================================ */

.card {
  background-color: var(--color-bg-card);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: 1.5rem;
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
}

.card:hover {
  box-shadow: var(--shadow-md);
  border-color: #d1d5db;
}

.card-header {
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 1rem;
  margin-bottom: 1rem;
}

.card-body {
  padding: 0;
}

.card-footer {
  border-top: 1px solid var(--color-border);
  padding-top: 1rem;
  margin-top: 1rem;
}

/* ============================================
   GRID & LAYOUT - ENHANCED
   ============================================ */

.grid {
  display: grid;
  gap: 1.5rem;
}

.grid-cols-1 {
  grid-template-columns: repeat(1, minmax(0, 1fr));
}

.grid-cols-2 {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.grid-cols-3 {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.grid-cols-4 {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

@media (max-width: 768px) {
  .grid-cols-2,
  .grid-cols-3,
  .grid-cols-4 {
    grid-template-columns: repeat(1, minmax(0, 1fr));
  }
}

@media (min-width: 768px) {
  .md\:grid-cols-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .md\:grid-cols-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .md\:grid-cols-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .lg\:grid-cols-3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .lg\:grid-cols-4 {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ============================================
   FLEXBOX UTILITIES - ENHANCED
   ============================================ */

.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.flex-row {
  flex-direction: row;
}

.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;
}

.justify-start {
  justify-content: flex-start;
}

.justify-end {
  justify-content: flex-end;
}

.flex-1 {
  flex: 1 1 0%;
}

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

/* ============================================
   BORDER & SHADOW UTILITIES
   ============================================ */

.border {
  border: 1px solid var(--color-border);
}

.border-t {
  border-top: 1px solid var(--color-border);
}

.border-b {
  border-bottom: 1px solid var(--color-border);
}

.border-l {
  border-left: 1px solid var(--color-border);
}

.border-r {
  border-right: 1px solid var(--color-border);
}

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

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

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

.rounded-2xl {
  border-radius: var(--radius-2xl);
}

.shadow-sm {
  box-shadow: var(--shadow-sm);
}

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

.shadow-lg {
  box-shadow: var(--shadow-lg);
}

.shadow-xl {
  box-shadow: var(--shadow-xl);
}

/* ============================================
   VISIBILITY & DISPLAY
   ============================================ */

.hidden {
  display: none;
}

.block {
  display: block;
}

.inline-block {
  display: inline-block;
}

.inline-flex {
  display: inline-flex;
}

.opacity-0 {
  opacity: 0;
}

.opacity-50 {
  opacity: 0.5;
}

.opacity-75 {
  opacity: 0.75;
}

.opacity-100 {
  opacity: 1;
}

/* ============================================
   TRANSITIONS & ANIMATIONS - ENHANCED
   ============================================ */

.transition {
  transition: all var(--transition-normal);
}

.transition-colors {
  transition: background-color, border-color, color var(--transition-normal);
}

.transition-opacity {
  transition: opacity var(--transition-normal);
}

.transition-transform {
  transition: transform var(--transition-normal);
}

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

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

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(-10px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

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

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

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

.animate-spin {
  animation: spin 1s linear infinite;
}

.animate-pulse {
  animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* ============================================
   RESPONSIVE UTILITIES
   ============================================ */

@media (max-width: 640px) {
  .sm\:hidden {
    display: none;
  }

  .sm\:block {
    display: block;
  }
}

@media (min-width: 640px) {
  .sm\:flex {
    display: flex;
  }

  .sm\:grid-cols-2 {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 768px) {
  .md\:flex {
    display: flex;
  }

  .md\:hidden {
    display: none;
  }

  .md\:p-8 {
    padding: 2rem;
  }
}

@media (min-width: 1024px) {
  .lg\:flex {
    display: flex;
  }

  .lg\:col-span-1 {
    grid-column: span 1 / span 1;
  }

  .lg\:col-span-3 {
    grid-column: span 3 / span 3;
  }
}

/* ============================================
   ACCESSIBILITY ENHANCEMENTS
   ============================================ */

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

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Skip to main content link */
.skip-to-main {
  position: absolute;
  top: -40px;
  left: 0;
  background: var(--color-primary);
  color: white;
  padding: 8px;
  text-decoration: none;
  z-index: 100;
}

.skip-to-main:focus {
  top: 0;
}

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

.w-full {
  width: 100%;
}

.h-full {
  height: 100%;
}

.h-screen {
  height: 100vh;
}

.max-w-6xl {
  max-width: 64rem;
}

.max-w-7xl {
  max-width: 80rem;
}

.mx-auto {
  margin-left: auto;
  margin-right: auto;
}

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

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

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

.overflow-hidden {
  overflow: hidden;
}

.overflow-y-auto {
  overflow-y: auto;
}

.overflow-x-hidden {
  overflow-x: hidden;
}

.sticky {
  position: sticky;
}

.top-0 {
  top: 0;
}

.top-6 {
  top: 1.5rem;
}

.relative {
  position: relative;
}

.absolute {
  position: absolute;
}

.inset-0 {
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}

.z-10 {
  z-index: 10;
}

.z-20 {
  z-index: 20;
}

.z-40 {
  z-index: 40;
}

.z-50 {
  z-index: 50;
}
.dark .modal-footer {
  background-color: #1f2937;
  border-color: #374151;
}

.dark .modal-title {
  color: #f3f4f6;
}

.dark .modal-close {
  color: #9ca3af;
}

.dark .modal-close:hover {
  color: #f3f4f6;
}