/* ============================================
   AI TRUST CHECK - MAIN STYLESHEET
   Modern SaaS Design with Dark/Light Mode
   ============================================ */

:root {
  /* Primary Colors */
  --primary-blue: #0066ff;
  --primary-blue-dark: #0052cc;
  --primary-blue-light: #e6f0ff;
  
  /* Neutrals */
  --white: #ffffff;
  --dark-gray-900: #0a0e27;
  --dark-gray-800: #121829;
  --dark-gray-700: #1a1f35;
  --dark-gray-600: #262d45;
  --dark-gray-500: #333847;
  --gray-400: #666d7d;
  --gray-300: #999ca8;
  --gray-200: #cccfd4;
  --gray-100: #ebebed;
  --light-bg: #f5f7fa;
  
  /* Status Colors */
  --success: #10b981;
  --warning: #f59e0b;
  --error: #ef4444;
  --info: #3b82f6;
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
  --font-mono: 'Menlo', 'Monaco', 'Courier New', monospace;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 2rem;
  
  /* 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);
  --shadow-glass: 0 8px 32px 0 rgba(31, 38, 135, 0.37);
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
  
  /* Z-index */
  --z-header: 1000;
  --z-modal: 1200;
  --z-tooltip: 1300;
}

/* Dark Mode (Default) */
[data-theme="dark"] {
  --bg-primary: var(--dark-gray-900);
  --bg-secondary: var(--dark-gray-800);
  --bg-tertiary: var(--dark-gray-700);
  --bg-hover: var(--dark-gray-600);
  --text-primary: var(--white);
  --text-secondary: var(--gray-300);
  --text-tertiary: var(--gray-400);
  --border-color: var(--dark-gray-600);
  --input-bg: var(--dark-gray-700);
  --input-border: var(--dark-gray-600);
}

/* Light Mode */
[data-theme="light"] {
  --bg-primary: var(--white);
  --bg-secondary: var(--light-bg);
  --bg-tertiary: var(--gray-100);
  --bg-hover: var(--gray-100);
  --text-primary: var(--dark-gray-900);
  --text-secondary: var(--gray-400);
  --text-tertiary: var(--gray-300);
  --border-color: var(--gray-200);
  --input-bg: var(--gray-100);
  --input-border: var(--gray-200);
}

/* ============================================
   GLOBAL STYLES
   ============================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-family);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text-primary);
  background-color: var(--bg-primary);
  transition: background-color var(--transition-base), color var(--transition-base);
}

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

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: var(--spacing-md);
}

h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 700;
}

h2 {
  font-size: clamp(1.5rem, 4vw, 2.5rem);
}

h3 {
  font-size: 1.75rem;
}

h4 {
  font-size: 1.25rem;
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

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

a:hover {
  color: var(--primary-blue-dark);
  text-decoration: underline;
}

code, pre {
  font-family: var(--font-mono);
}

code {
  background-color: var(--bg-tertiary);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  font-size: 0.875em;
}

pre {
  background-color: var(--bg-tertiary);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  margin-bottom: var(--spacing-lg);
}

pre code {
  background: none;
  padding: 0;
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.625rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  user-select: none;
}

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

.btn-primary {
  background-color: var(--primary-blue);
  color: var(--white);
  box-shadow: var(--shadow-md);
}

.btn-primary:hover {
  background-color: var(--primary-blue-dark);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background-color: var(--bg-tertiary);
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

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

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

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

.btn-ghost {
  background-color: transparent;
  color: var(--text-primary);
  border: none;
}

.btn-ghost:hover {
  background-color: var(--bg-tertiary);
}

.btn-sm {
  padding: 0.375rem 0.75rem;
  font-size: 0.875rem;
}

.btn-lg {
  padding: 0.875rem 2rem;
  font-size: 1.125rem;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ============================================
   FORMS
   ============================================ */

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

label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 500;
  color: var(--text-primary);
}

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

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--primary-blue);
  box-shadow: 0 0 0 3px var(--primary-blue-light);
}

textarea {
  resize: vertical;
  min-height: 120px;
}

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

.card {
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
  backdrop-filter: blur(10px);
}

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

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

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

.grid {
  display: grid;
  gap: var(--spacing-lg);
}

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

.grid-3 {
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

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

header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  background-color: rgba(10, 14, 39, 0.7);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-color);
  transition: background-color var(--transition-fast);
}

[data-theme="light"] header {
  background-color: rgba(255, 255, 255, 0.7);
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md) 0;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--primary-blue);
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
}

nav {
  display: flex;
  gap: var(--spacing-xl);
  align-items: center;
}

nav a {
  color: var(--text-secondary);
  font-weight: 500;
  transition: color var(--transition-fast);
}

nav a:hover, nav a.active {
  color: var(--primary-blue);
}

.nav-divider {
  width: 1px;
  height: 24px;
  background-color: var(--border-color);
}

.theme-toggle {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.25rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.theme-toggle:hover {
  color: var(--primary-blue);
}

.mobile-menu {
  display: none;
  flex-direction: column;
  gap: 4px;
  background: none;
  border: none;
  cursor: pointer;
}

.mobile-menu span {
  width: 24px;
  height: 2px;
  background-color: var(--text-primary);
  transition: all var(--transition-fast);
}

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

footer {
  background-color: var(--bg-secondary);
  border-top: 1px solid var(--border-color);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
  margin-top: var(--spacing-3xl);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

.footer-section h4 {
  margin-bottom: var(--spacing-lg);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--spacing-md);
}

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

.footer-section a:hover {
  color: var(--primary-blue);
}

.footer-bottom {
  border-top: 1px solid var(--border-color);
  padding-top: var(--spacing-xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
  font-size: 0.875rem;
  color: var(--text-tertiary);
}

.footer-bottom a {
  color: var(--text-tertiary);
}

/* ============================================
   HERO SECTION
   ============================================ */

.hero {
  padding: var(--spacing-3xl) 0;
  text-align: center;
  background: linear-gradient(135deg, transparent 0%, rgba(0, 102, 255, 0.05) 100%);
  border-bottom: 1px solid var(--border-color);
}

.hero h1 {
  margin-bottom: var(--spacing-lg);
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-blue-dark) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.25rem;
  color: var(--text-secondary);
  margin-bottom: var(--spacing-2xl);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: flex;
  gap: var(--spacing-lg);
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: var(--spacing-2xl);
}

.hero-image {
  margin-top: var(--spacing-2xl);
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-2xl);
}

/* ============================================
   SECTION STYLES
   ============================================ */

.section {
  padding: var(--spacing-3xl) 0;
}

.section-header {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-header h2 {
  margin-bottom: var(--spacing-md);
}

.section-header p {
  font-size: 1.125rem;
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================
   FEATURE CARDS
   ============================================ */

.feature-card {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
}

.feature-icon {
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary-blue), var(--primary-blue-dark));
  border-radius: var(--radius-lg);
  font-size: 1.75rem;
}

.feature-card h3 {
  margin: 0;
}

.feature-card p {
  margin: 0;
  font-size: 0.95rem;
}

/* ============================================
   BADGES & TAGS
   ============================================ */

.badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
}

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

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

.badge-warning {
  background-color: var(--warning);
  color: var(--dark-gray-900);
}

.badge-error {
  background-color: var(--error);
  color: var(--white);
}

.badge-outline {
  background-color: transparent;
  border: 1px solid var(--border-color);
  color: var(--text-primary);
}

/* ============================================
   ALERTS & MESSAGES
   ============================================ */

.alert {
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  border-left: 4px solid;
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
}

.alert-success {
  background-color: rgba(16, 185, 129, 0.1);
  border-color: var(--success);
  color: var(--success);
}

.alert-warning {
  background-color: rgba(245, 158, 11, 0.1);
  border-color: var(--warning);
  color: var(--warning);
}

.alert-error {
  background-color: rgba(239, 68, 68, 0.1);
  border-color: var(--error);
  color: var(--error);
}

.alert-info {
  background-color: rgba(59, 130, 246, 0.1);
  border-color: var(--info);
  color: var(--info);
}

.alert-icon {
  flex-shrink: 0;
  font-size: 1.25rem;
}

.alert-content {
  flex: 1;
}

/* ============================================
   MODALS & OVERLAYS
   ============================================ */

.modal-overlay {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: var(--z-modal) - 1;
  animation: fadeIn var(--transition-base);
}

.modal-overlay.active {
  display: block;
}

.modal {
  display: none;
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  z-index: var(--z-modal);
  background-color: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-2xl);
  padding: var(--spacing-2xl);
  max-width: 500px;
  width: 90%;
  max-height: 90vh;
  overflow-y: auto;
  animation: slideUp var(--transition-base);
}

.modal.active {
  display: block;
}

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

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

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translate(-50%, -40%);
  }
  to {
    opacity: 1;
    transform: translate(-50%, -50%);
  }
}

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

@keyframes shimmer {
  0% { background-position: -1000px 0; }
  100% { background-position: 1000px 0; }
}

.loading {
  animation: pulse var(--transition-slow) infinite;
}

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

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

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

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

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

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

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

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

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

.mt { margin-top: var(--spacing-lg); }
.mb { margin-bottom: var(--spacing-lg); }
.ml { margin-left: var(--spacing-lg); }
.mr { margin-right: var(--spacing-lg); }
.mt-lg { margin-top: var(--spacing-2xl); }
.mb-lg { margin-bottom: var(--spacing-2xl); }

.pt { padding-top: var(--spacing-lg); }
.pb { padding-bottom: var(--spacing-lg); }
.pl { padding-left: var(--spacing-lg); }
.pr { padding-right: var(--spacing-lg); }

.flex {
  display: flex;
}

.flex-center {
  display: flex;
  align-items: center;
  justify-content: center;
}

.flex-between {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

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

.w-full {
  width: 100%;
}

.h-full {
  height: 100%;
}

.hidden {
  display: none !important;
}

.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;
}

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

@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }
  
  h1 {
    font-size: clamp(1.5rem, 4vw, 2rem);
  }
  
  .hero {
    padding: var(--spacing-2xl) 0;
  }
  
  .section {
    padding: var(--spacing-2xl) 0;
  }
  
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
  
  nav {
    display: none;
  }
  
  .mobile-menu {
    display: flex;
  }
  
  .hero-cta {
    flex-direction: column;
  }
  
  .hero-cta .btn {
    width: 100%;
  }
  
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

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

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

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    color-scheme: light;
  }
}

/* ============================================
   PERFORMANCE - LAZY LOADING
   ============================================ */

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

img[loading="lazy"] {
  background-color: var(--bg-tertiary);
}

/* ============================================
   SCROLLBAR STYLING
   ============================================ */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--primary-blue);
}

/* ============================================
   PRINT STYLES
   ============================================ */

@media print {
  body {
    background: white;
    color: black;
  }
  
  header, footer, nav, .no-print {
    display: none;
  }
  
  a {
    color: inherit;
    text-decoration: underline;
  }
}