/**
 * Common Shared Styles with Design Tokens
 * Centralized design system for consistent styling across all pages
 */

/* Design Tokens */
:root {
  /* Colors - Primary */
  --color-primary: #667eea;
  --color-primary-dark: #764ba2;
  --color-primary-light: rgba(102, 126, 234, 0.1);
  
  /* Colors - Secondary */
  --color-secondary: #2c5282;
  --color-secondary-dark: #1a365d;
  --color-secondary-light: #e2e8f0;
  
  /* Colors - Accent */
  --color-accent: #48bb78;
  --color-accent-dark: #38a169;
  --color-accent-light: rgba(72, 187, 120, 0.4);
  
  /* Colors - Status */
  --color-success-bg: #c6f6d5;
  --color-success-text: #22543d;
  --color-error-bg: #fed7d7;
  --color-error-text: #742a2a;
  --color-error: #f56565;
  --color-error-dark: #e53e3e;
  --color-warning-bg: #feebc8;
  --color-warning-text: #7c2d12;
  --color-warning-light-bg: #fef3c7;
  --color-warning-dark-text: #78350f;
  --color-info-bg: #bee3f8;
  --color-info-text: #2c5282;
  
  /* Colors - Beta Badge */
  --color-beta-bg: #f6ad55;
  --color-beta-text: #1a202c;
  
  /* Colors - Text */
  --color-text-primary: #2d3748;
  --color-text-secondary: #4a5568;
  --color-text-tertiary: #718096;
  --color-text-light: #cbd5e0;
  --color-text-white: #ffffff;
  
  /* Colors - Background */
  --color-bg-body: #f7fafc;
  --color-bg-white: #ffffff;
  --color-bg-dark: #2d3748;
  
  /* Colors - Border */
  --color-border: #cbd5e0;
  --color-border-light: #e2e8f0;
  --color-border-lighter: #f3f4f6;
  
  /* Gradients */
  --gradient-body: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --gradient-header: linear-gradient(135deg, #1a365d 0%, #2c5282 100%);
  --gradient-hero: linear-gradient(135deg, #2c5282 0%, #2d3748 100%);
  --gradient-cta: linear-gradient(135deg, #2c5282 0%, #1a365d 100%);
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-xxs: 0.7rem;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-md: 0.95rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 2rem;
  --font-size-4xl: 2.5rem;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.5rem;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --line-height-tight: 1.2;
  --line-height-normal: 1.6;
  --line-height-relaxed: 1.8;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 0.75rem;
  --spacing-lg: 1rem;
  --spacing-xl: 1.5rem;
  --spacing-2xl: 2rem;
  --spacing-3xl: 2.5rem;
  --spacing-4xl: 3rem;
  --spacing-5xl: 4rem;
  --spacing-6xl: 5rem;
  --spacing-7xl: 6rem;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  
  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0,0,0,0.1);
  --shadow-md: 0 2px 16px rgba(0,0,0,0.1);
  --shadow-lg: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-xl: 0 8px 24px rgba(0,0,0,0.12);
  --shadow-button: 0 4px 12px rgba(102, 126, 234, 0.4);
  --shadow-button-accent: 0 4px 12px rgba(72, 187, 120, 0.4);
  --shadow-button-secondary: 0 4px 12px rgba(44, 82, 130, 0.4);
  --shadow-focus: 0 0 0 3px var(--color-primary-light);
  
  /* Transitions */
  --transition-fast: 0.2s;
  --transition-base: 0.3s;
  
  /* Layout */
  --container-max-width: 1200px;
  --container-max-width-lg: 1400px;
  --container-max-width-sm: 450px;
  --container-max-width-md: 600px;
}

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

/* Base Styles */
body {
  font-family: var(--font-family);
  background: var(--gradient-body);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  color: var(--color-text-primary);
  line-height: var(--line-height-normal);
}

main {
  flex: 1;
  max-width: var(--container-max-width);
  width: 100%;
  margin: 0 auto;
  padding: var(--spacing-4xl) var(--spacing-2xl);
}

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

h1 { font-size: var(--font-size-6xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

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

/* Form Elements */
.form-group {
  margin-bottom: var(--spacing-xl);
}

.form-section {
  background: var(--color-bg-white);
  padding: var(--spacing-2xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  margin-bottom: var(--spacing-xl);
}

.form-section h3 {
  color: var(--color-text-primary);
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-xl);
  padding-bottom: var(--spacing-sm);
  border-bottom: 2px solid var(--color-border-light);
}

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

input,
select,
textarea {
  width: 100%;
  padding: var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-base);
  font-family: var(--font-family);
  box-sizing: border-box;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

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

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

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

.help-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-tertiary);
  margin-top: var(--spacing-xs);
}

/* Buttons */
.btn {
  padding: var(--spacing-md) var(--spacing-2xl);
  border: none;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  font-family: var(--font-family);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  display: inline-block;
  text-align: center;
}

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

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

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

.btn-secondary {
  background: var(--color-secondary-light);
  color: var(--color-text-primary);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--color-border);
}

.btn-danger {
  background: var(--color-error);
  color: var(--color-text-white);
}

.btn-danger:hover:not(:disabled) {
  background: var(--color-error-dark);
}

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

/* CTA Buttons */
.cta-button {
  background: var(--color-accent);
  color: var(--color-text-white);
  padding: var(--spacing-md) var(--spacing-xl);
  border-radius: var(--radius-md);
  text-decoration: none;
  font-weight: var(--font-weight-semibold);
  transition: all var(--transition-fast);
  border: none;
  cursor: pointer;
  display: inline-block;
  font-size: var(--font-size-base);
  font-family: var(--font-family);
}

.cta-button:hover {
  background: var(--color-accent-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-button-accent);
}

.cta-button.secondary {
  background: transparent;
  border: 2px solid var(--color-text-white);
  color: var(--color-text-white);
}

.cta-button.secondary:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

/* Messages and Alerts */
.message {
  padding: var(--spacing-lg);
  border-radius: var(--radius-sm);
  margin-bottom: var(--spacing-lg);
  display: none;
}

.message.success {
  background: var(--color-success-bg);
  color: var(--color-success-text);
  display: block;
}

.message.error {
  background: var(--color-error-bg);
  color: var(--color-error-text);
  display: block;
}

.message.warning {
  background: var(--color-warning-bg);
  color: var(--color-warning-text);
  display: block;
}

.message.info {
  background: var(--color-info-bg);
  color: var(--color-info-text);
  display: block;
}

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

a:hover {
  text-decoration: underline;
}

a:focus {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

/* Breadcrumbs */
.breadcrumb {
  color: var(--color-text-tertiary);
  font-size: var(--font-size-sm);
  margin-bottom: var(--spacing-sm);
}

.breadcrumb a {
  color: var(--color-primary);
  text-decoration: none;
}

.breadcrumb a:hover {
  text-decoration: underline;
}

/* Page Headers */
.page-header {
  margin-bottom: var(--spacing-2xl);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.page-header h2 {
  margin-bottom: var(--spacing-sm);
}

/* Containers */
.login-container,
.signup-container {
  width: 100%;
  max-width: var(--container-max-width-sm);
}

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

/* Search Bar */
.search-bar {
  margin-bottom: var(--spacing-2xl);
  background: var(--color-bg-white);
  padding: var(--spacing-xl);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
}

.search-bar input {
  width: 100%;
}

/* Cards */
.card {
  background: var(--color-bg-white);
  padding: var(--spacing-3xl);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-lg);
  transition: all var(--transition-base);
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-xl);
}

/* Beta Badge */
.beta-badge {
  background: var(--color-beta-bg);
  color: var(--color-beta-text);
  font-size: var(--font-size-xxs);
  font-weight: var(--font-weight-bold);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-sm);
  margin-left: var(--spacing-sm);
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

/* Utility Classes */
.text-center {
  text-align: center;
}

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

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

/* Margin utilities */
.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-lg); }
.mt-3 { margin-top: var(--spacing-xl); }
.mt-4 { margin-top: var(--spacing-2xl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-lg); }
.mb-3 { margin-bottom: var(--spacing-xl); }
.mb-4 { margin-bottom: var(--spacing-2xl); }

.ml-1 { margin-left: var(--spacing-sm); }
.ml-2 { margin-left: var(--spacing-lg); }

.mr-1 { margin-right: var(--spacing-sm); }
.mr-2 { margin-right: var(--spacing-lg); }

/* Padding utilities */
.p-1 { padding: var(--spacing-sm); }
.p-2 { padding: var(--spacing-lg); }
.p-3 { padding: var(--spacing-xl); }
.p-4 { padding: var(--spacing-2xl); }

/* Display utilities */
.flex {
  display: flex;
}

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

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

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

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

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

.gap-1 { gap: var(--spacing-sm); }
.gap-2 { gap: var(--spacing-lg); }
.gap-3 { gap: var(--spacing-xl); }
.gap-4 { gap: var(--spacing-2xl); }

/* Width utilities */
.w-full {
  width: 100%;
}

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

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

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

.max-w-xl {
  max-width: var(--container-max-width-lg);
}

/* Responsive */
@media (max-width: 768px) {
  main {
    padding: var(--spacing-2xl) var(--spacing-lg);
  }

  h1 {
    font-size: var(--font-size-4xl);
  }

  h2 {
    font-size: var(--font-size-2xl);
  }

  h3 {
    font-size: var(--font-size-xl);
  }

  .btn {
    padding: 0.625rem var(--spacing-xl);
    font-size: var(--font-size-sm);
  }

  .page-header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-lg);
  }
}

/* Accessibility */
.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;
}

/* Loading State */
.loading {
  opacity: 0.6;
  pointer-events: none;
}

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

/* Smooth Scroll */
html {
  scroll-behavior: smooth;
}

/* Links within text */
.links {
  margin-top: var(--spacing-xl);
  text-align: center;
  color: var(--color-text-secondary);
}

.links a {
  color: var(--color-primary);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
}

.links a:hover {
  text-decoration: underline;
}

/* Subtitle */
.subtitle {
  text-align: center;
  color: var(--color-text-tertiary);
  margin-bottom: var(--spacing-2xl);
  font-size: var(--font-size-base);
}