frontend/src/index.css

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&display=swap');

:root {
  /* Glass Effects */
  --glass-bg: rgba(255, 255, 255, 0.85);
  --glass-border: rgba(255, 255, 255, 0.3);
  --glass-blur: blur(20px);

  /* Colors */
  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-dark: #4f46e5;
  --secondary: #ec4899;
  --accent: #06b6d4;

  /* Text */
  --text: #1e293b;
  --text-secondary: #64748b;
  --text-muted: #94a3b8;

  /* Backgrounds */
  --bg-base: #f1f5f9;
  --bg-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --card-bg: rgba(255, 255, 255, 0.9);

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --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);

  /* Spacing */
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 24px;
}

[data-theme='dark'] {
  --glass-bg: rgba(30, 41, 59, 0.9);
  --glass-border: rgba(255, 255, 255, 0.1);
  --text: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-muted: #94a3b8;
  --bg-base: #0f172a;
  --bg-gradient: linear-gradient(135deg, #1e1b4b 0%, #312e81 100%);
  --card-bg: rgba(30, 41, 59, 0.95);
}

[data-palette='pastel-blue'] {
  --primary: #3b82f6;
  --primary-light: #60a5fa;
  --primary-dark: #2563eb;
  --bg-gradient: linear-gradient(135deg, #3b82f6 0%, #8b5cf6 100%);
}

[data-palette='pastel-green'] {
  --primary: #10b981;
  --primary-light: #34d399;
  --primary-dark: #059669;
  --bg-gradient: linear-gradient(135deg, #10b981 0%, #06b6d4 100%);
}

[data-palette='pastel-purple'] {
  --primary: #8b5cf6;
  --primary-light: #a78bfa;
  --primary-dark: #7c3aed;
  --bg-gradient: linear-gradient(135deg, #8b5cf6 0%, #ec4899 100%);
}

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

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  min-height: 100vh;
  background: var(--bg-gradient);
  background-attachment: fixed;
  color: var(--text);
  line-height: 1.6;
}

/* Typography */
h1 {
  font-size: 2rem;
  font-weight: 800;
  letter-spacing: -0.025em;
}

h2 {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

h3 {
  font-size: 1.25rem;
  font-weight: 600;
}

h4 {
  font-size: 1rem;
  font-weight: 600;
}

/* Glass Container */
.glass-container {
  background: var(--glass-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

/* Cards */
.card {
  background: var(--card-bg);
  backdrop-filter: var(--glass-blur);
  -webkit-backdrop-filter: var(--glass-blur);
  border: 1px solid var(--glass-border);
  padding: 1.5rem;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

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

/* Buttons */
button {
  cursor: pointer;
  border: none;
  border-radius: var(--radius-md);
  padding: 0.75rem 1.5rem;
  font-family: inherit;
  font-size: 0.875rem;
  font-weight: 600;
  transition: all 0.2s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--text);
}

button.primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 4px 14px rgba(99, 102, 241, 0.4);
}

button.primary:hover {
  background: var(--primary-dark);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(99, 102, 241, 0.5);
}

button.secondary {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
}

button.secondary:hover {
  background: rgba(99, 102, 241, 0.1);
}

button.danger {
  color: #ef4444;
}

button.danger:hover {
  background: rgba(239, 68, 68, 0.1);
}

/* Inputs */
input,
select,
textarea {
  width: 100%;
  padding: 0.875rem 1rem;
  font-family: inherit;
  font-size: 0.9375rem;
  background: var(--glass-bg);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  color: var(--text);
  transition: all 0.2s ease;
  outline: none;
}

input:focus,
select:focus,
textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.15);
}

input::placeholder {
  color: var(--text-muted);
}

input[type="file"] {
  padding: 0.5rem;
}

input[type="radio"] {
  width: auto;
  margin: 0;
  accent-color: var(--primary);
  cursor: pointer;
}

/* Layout Utilities */
.flex {
  display: flex;
}

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

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

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

.items-start {
  align-items: flex-start;
}

.justify-center {
  justify-content: center;
}

.justify-between {
  justify-content: space-between;
}

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

.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;
}

.m-0 {
  margin: 0;
}

.mt-2 {
  margin-top: 0.5rem;
}

.mt-4 {
  margin-top: 1rem;
}

.mt-6 {
  margin-top: 1.5rem;
}

.mb-2 {
  margin-bottom: 0.5rem;
}

.mb-4 {
  margin-bottom: 1rem;
}

.mb-6 {
  margin-bottom: 1.5rem;
}

.w-full {
  width: 100%;
}

.max-w-md {
  max-width: 28rem;
}

.max-w-lg {
  max-width: 32rem;
}

.max-w-xl {
  max-width: 36rem;
}

.max-w-2xl {
  max-width: 42rem;
}

.max-w-4xl {
  max-width: 56rem;
}

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

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

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

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

.text-muted {
  color: var(--text-muted);
}

.text-secondary {
  color: var(--text-secondary);
}

.font-medium {
  font-weight: 500;
}

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

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

/* Header */
.app-header {
  position: sticky;
  top: 0;
  z-index: 100;
  margin: 1rem;
  padding: 0.875rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.header-logo {
  width: 40px;
  height: 40px;
  background: var(--primary);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
}

.header-title {
  font-size: 1.25rem;
  font-weight: 700;
  background: var(--bg-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

/* Navigation Links */
.nav-link {
  text-decoration: none;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.625rem 1rem;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.9375rem;
  transition: all 0.2s ease;
}

.nav-link:hover {
  color: var(--text);
  background: rgba(99, 102, 241, 0.1);
}

.nav-link.active {
  background: var(--primary);
  color: white;
  box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

/* Main Content */
.main-content {
  padding: 1rem 1.5rem 2rem;
  max-width: 1200px;
  margin: 0 auto;
}

/* Page Container */
.page-container {
  padding: 1.5rem;
}

/* Question Card */
.question-card {
  background: var(--card-bg);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin-bottom: 1rem;
  border: 1px solid var(--glass-border);
  box-shadow: var(--shadow-sm);
}

.question-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  min-width: 2rem;
  height: 2rem;
  background: var(--primary);
  color: white;
  font-weight: 700;
  font-size: 0.875rem;
  border-radius: 50%;
  margin-right: 0.75rem;
  flex-shrink: 0;
}

.question-text {
  font-weight: 600;
  font-size: 1.0625rem;
  color: var(--text);
  margin-bottom: 1rem;
  display: flex;
  align-items: flex-start;
}

/* Options */
.options-list {
  display: flex;
  flex-direction: column;
  gap: 0.625rem;
}

.option-item {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.875rem 1rem;
  background: rgba(255, 255, 255, 0.5);
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.2s ease;
}

[data-theme='dark'] .option-item {
  background: rgba(255, 255, 255, 0.05);
}

.option-item:hover {
  background: rgba(99, 102, 241, 0.1);
  border-color: var(--primary-light);
}

.option-item.selected {
  background: rgba(99, 102, 241, 0.15);
  border-color: var(--primary);
}

.option-item input[type="radio"] {
  width: 1.125rem;
  height: 1.125rem;
  flex-shrink: 0;
}

.option-label {
  font-size: 0.9375rem;
  color: var(--text);
  flex: 1;
}

/* Test Card Grid */
.test-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.5rem;
}

.test-card {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.test-card-icon {
  width: 3.5rem;
  height: 3.5rem;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  margin-bottom: 1rem;
}

.test-card-content {
  flex: 1;
}

.test-card h3 {
  margin-bottom: 0.5rem;
}

.test-card p {
  color: var(--text-secondary);
  font-size: 0.9375rem;
}

/* Result Card */
.result-card {
  text-align: center;
  padding: 3rem 2rem;
}

.result-icon {
  width: 5rem;
  height: 5rem;
  background: linear-gradient(135deg, var(--primary-light), var(--primary));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  margin: 0 auto 1.5rem;
}

.result-score {
  font-size: 3rem;
  font-weight: 800;
  background: var(--bg-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin: 1rem 0;
}

/* Tables */
.data-table {
  width: 100%;
  border-collapse: collapse;
  text-align: left;
}

.data-table th {
  padding: 1rem;
  font-weight: 600;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  border-bottom: 2px solid var(--glass-border);
}

.data-table td {
  padding: 1rem;
  border-bottom: 1px solid var(--glass-border);
  font-size: 0.9375rem;
}

.data-table tr:last-child td {
  border-bottom: none;
}

.data-table tr:hover td {
  background: rgba(99, 102, 241, 0.05);
}

/* Badge */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.75rem;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: 9999px;
}

.badge-admin {
  background: rgba(99, 102, 241, 0.15);
  color: var(--primary);
}

.badge-user {
  background: rgba(16, 185, 129, 0.15);
  color: #10b981;
}

/* Theme Settings Dropdown */
.theme-dropdown {
  position: relative;
}

.theme-toggle-btn {
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border-radius: 50%;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
}

.theme-menu {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  min-width: 200px;
  padding: 0.75rem;
  background: var(--card-bg);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  z-index: 50;
}

.theme-menu-section {
  padding: 0.5rem 0;
}

.theme-menu-section+.theme-menu-section {
  border-top: 1px solid var(--glass-border);
}

.theme-menu-label {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
}

.color-swatches {
  display: flex;
  gap: 0.5rem;
}

.color-swatch {
  width: 1.75rem;
  height: 1.75rem;
  border-radius: 50%;
  cursor: pointer;
  border: 3px solid transparent;
  transition: all 0.2s ease;
}

.color-swatch:hover {
  transform: scale(1.1);
}

.color-swatch.active {
  border-color: var(--text);
  box-shadow: 0 0 0 2px var(--card-bg);
}

/* User Info */
.user-info {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.user-avatar {
  width: 2.25rem;
  height: 2.25rem;
  background: var(--primary);
  color: white;
  font-weight: 700;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.875rem;
}

.user-name {
  font-weight: 600;
  font-size: 0.9375rem;
}

/* Loading */
.loading-container {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
}

.loading-spinner {
  width: 3rem;
  height: 3rem;
  border: 3px solid var(--glass-border);
  border-top-color: var(--primary);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

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

/* Empty State */
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-muted);
}

.empty-state-icon {
  width: 4rem;
  height: 4rem;
  margin: 0 auto 1rem;
  opacity: 0.5;
}

/* Responsive */
@media (max-width: 768px) {
  .app-header {
    flex-wrap: wrap;
    padding: 1rem;
  }

  .header-nav {
    order: 3;
    width: 100%;
    justify-content: center;
    margin-top: 0.5rem;
  }

  .test-grid {
    grid-template-columns: 1fr;
  }

  .main-content {
    padding: 1rem;
  }
}