/* ============================================
   Fashion Discovery Engine - Main Styles
   ============================================ */

/* CSS Variables */
:root {
  /* Colors */
  --color-black: #0a0a0a;
  --color-white: #ffffff;
  --color-gray-50: #fafafa;
  --color-gray-100: #f5f5f5;
  --color-gray-200: #e5e5e5;
  --color-gray-300: #d4d4d4;
  --color-gray-400: #a3a3a3;
  --color-gray-500: #737373;
  --color-gray-600: #525252;
  --color-gray-700: #404040;
  --color-gray-800: #262626;
  --color-gray-900: #171717;

  /* Brand Colors */
  --color-primary: #1a1a2e;
  --color-primary-light: #16213e;
  --color-accent: #e94560;
  --color-accent-hover: #d63d56;
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;

  /* Semantic Colors */
  --bg-primary: var(--color-white);
  --bg-secondary: var(--color-gray-50);
  --bg-tertiary: var(--color-gray-100);
  --text-primary: var(--color-gray-900);
  --text-secondary: var(--color-gray-600);
  --text-muted: var(--color-gray-400);
  --border-color: var(--color-gray-200);

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

  /* Spacing */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* 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), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

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

  /* Layout */
  --max-width: 1280px;
  --header-height: 72px;
}

/* Dark Mode - Manual Toggle */
[data-theme="dark"] {
  --bg-primary: #121212;
  --bg-secondary: #1e1e1e;
  --bg-tertiary: #2a2a2a;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border-color: #374151;
  --color-primary: #2a2a4e;
  --color-primary-light: #3a3a5e;
}

/* System preference fallback */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg-primary: #121212;
    --bg-secondary: #1e1e1e;
    --bg-tertiary: #2a2a2a;
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #374151;
  }
}

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

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

body {
  font-family: var(--font-sans);
  color: var(--text-primary);
  background-color: var(--bg-secondary);
  line-height: 1.6;
  min-height: 100vh;
}

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

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; }

p {
  margin-bottom: var(--space-md);
}

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

a:hover {
  color: var(--color-accent-hover);
}

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

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

.mx-auto { margin-left: auto; margin-right: auto; }
.px-4 { padding-left: 1rem; padding-right: 1rem; }
.py-8 { padding-top: 2rem; padding-bottom: 2rem; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-color);
  height: var(--header-height);
}

.navbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--text-primary);
}

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

.logo-icon svg {
  width: 28px;
  height: 28px;
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--space-xl);
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  padding: var(--space-sm) 0;
  position: relative;
}

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

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-accent);
}

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

.search-toggle,
.mobile-menu-toggle {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.search-toggle:hover,
.mobile-menu-toggle:hover {
  color: var(--text-primary);
}

.search-toggle svg,
.mobile-menu-toggle svg {
  width: 24px;
  height: 24px;
}

.mobile-menu-toggle {
  display: none;
}

/* Search Overlay */
.search-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.8);
  z-index: 200;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding-top: 20vh;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-normal), visibility var(--transition-normal);
}

.search-overlay.active {
  opacity: 1;
  visibility: visible;
}

.search-container {
  display: flex;
  align-items: center;
  width: 100%;
  max-width: 600px;
  padding: 0 var(--space-lg);
}

.search-container input {
  flex: 1;
  padding: var(--space-lg);
  font-size: 1.5rem;
  border: none;
  border-radius: var(--radius-lg);
  background: var(--bg-primary);
  color: var(--text-primary);
}

.search-container input:focus {
  outline: none;
}

.search-close {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-md);
  color: var(--color-white);
  margin-left: var(--space-md);
}

.search-close svg {
  width: 32px;
  height: 32px;
}

.search-results {
  width: 100%;
  max-width: 600px;
  padding: var(--space-lg);
}

/* Footer */
.site-footer {
  background: var(--color-gray-900);
  color: var(--color-gray-300);
  padding: var(--space-3xl) 0 var(--space-xl);
  margin-top: var(--space-3xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--space-2xl);
}

.footer-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-white);
  display: block;
  margin-bottom: var(--space-md);
}

.footer-tagline {
  color: var(--color-gray-400);
  margin-bottom: var(--space-lg);
}

.footer-social {
  display: flex;
  gap: var(--space-md);
}

.footer-social a {
  color: var(--color-gray-400);
  transition: color var(--transition-fast);
}

.footer-social a:hover {
  color: var(--color-white);
}

.footer-social svg {
  width: 24px;
  height: 24px;
}

.footer-links h4 {
  color: var(--color-white);
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-lg);
}

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

.footer-links li {
  margin-bottom: var(--space-sm);
}

.footer-links a {
  color: var(--color-gray-400);
  font-size: 0.9rem;
}

.footer-links a:hover {
  color: var(--color-white);
}

.footer-bottom {
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: 1px solid var(--color-gray-800);
  text-align: center;
}

.copyright {
  color: var(--color-gray-500);
  font-size: 0.875rem;
  margin-bottom: var(--space-sm);
}

.affiliate-disclosure {
  color: var(--color-gray-600);
  font-size: 0.75rem;
  max-width: 600px;
  margin: 0 auto;
}

/* Responsive */
@media (max-width: 768px) {
  .mobile-menu-toggle {
    display: block;
  }

  .nav-links {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--bg-primary);
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-xl);
    transform: translateX(100%);
    transition: transform var(--transition-normal);
  }

  .nav-links.open {
    transform: translateX(0);
  }

  .nav-links a {
    font-size: 1.25rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    text-align: center;
  }

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

/* ============================================
   Reading Progress Bar
   ============================================ */

.reading-progress {
  position: absolute;
  top: 0;
  left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--color-accent), var(--color-success));
  z-index: 101;
  transition: width 0.1s ease-out;
}

/* ============================================
   Navigation Action Buttons
   ============================================ */

.nav-action-btn {
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
}

.nav-action-btn:hover {
  color: var(--text-primary);
  background: var(--bg-secondary);
}

.nav-action-btn svg {
  width: 20px;
  height: 20px;
}

/* Dark Mode Toggle */
#dark-mode-toggle .icon-sun,
#dark-mode-toggle .icon-moon {
  display: none;
}

[data-theme="light"] #dark-mode-toggle .icon-moon,
:root:not([data-theme]) #dark-mode-toggle .icon-moon {
  display: block;
}

[data-theme="dark"] #dark-mode-toggle .icon-sun {
  display: block;
}

/* ============================================
   User Menu
   ============================================ */

.user-menu {
  position: relative;
}

.user-avatar {
  width: 32px;
  height: 32px;
  background: var(--color-accent);
  border-radius: 50%;
}

.avatar-initial {
  font-weight: 600;
  font-size: 0.9rem;
  color: white;
}

.user-dropdown {
  position: absolute;
  top: calc(100% + var(--space-sm));
  right: 0;
  min-width: 200px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-fast);
  z-index: 100;
}

.user-dropdown.open {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

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

.user-score {
  font-size: 0.8rem;
  color: var(--color-accent);
  font-weight: 600;
}

.dropdown-divider {
  height: 1px;
  background: var(--border-color);
  margin: var(--space-xs) 0;
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  color: var(--text-primary);
  transition: background var(--transition-fast);
}

.dropdown-item:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.dropdown-item svg {
  width: 18px;
  height: 18px;
  color: var(--text-muted);
}

.dropdown-item .badge {
  margin-left: auto;
  background: var(--color-accent);
  color: white;
  padding: 2px 6px;
  border-radius: var(--radius-full);
  font-size: 0.7rem;
  font-weight: 600;
}

.dropdown-item--danger {
  color: var(--color-error);
}

.dropdown-item--danger svg {
  color: var(--color-error);
}

/* ============================================
   Modal
   ============================================ */

.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  z-index: 500;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-lg);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

.modal-overlay.open {
  opacity: 1;
  visibility: visible;
}

.modal {
  position: relative;
  width: 100%;
  max-width: 400px;
  background: var(--bg-primary);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: var(--shadow-xl);
  transform: scale(0.95);
  transition: transform var(--transition-normal);
}

.modal-overlay.open .modal {
  transform: scale(1);
}

.modal-close {
  position: absolute;
  top: var(--space-md);
  right: var(--space-md);
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-xs);
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

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

.modal-close svg {
  width: 24px;
  height: 24px;
}

/* ============================================
   Auth Forms
   ============================================ */

.auth-form h2 {
  text-align: center;
  margin-bottom: var(--space-xs);
}

.auth-subtitle {
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

.form-group {
  margin-bottom: var(--space-md);
}

.form-group label {
  display: block;
  font-size: 0.9rem;
  font-weight: 500;
  margin-bottom: var(--space-xs);
}

.form-group input[type="text"],
.form-group input[type="email"],
.form-group input[type="password"] {
  width: 100%;
  padding: var(--space-sm) var(--space-md);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  background: var(--bg-primary);
  color: var(--text-primary);
  font-size: 1rem;
  transition: border-color var(--transition-fast);
}

.form-group input:focus {
  outline: none;
  border-color: var(--color-accent);
}

.form-hint {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-top: var(--space-xs);
}

.form-error {
  color: var(--color-error);
  font-size: 0.85rem;
  margin-bottom: var(--space-md);
  text-align: center;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  cursor: pointer;
  font-size: 0.9rem;
}

.checkbox-label input[type="checkbox"] {
  width: 18px;
  height: 18px;
  accent-color: var(--color-accent);
}

.auth-switch {
  text-align: center;
  margin-top: var(--space-lg);
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.auth-switch a {
  color: var(--color-accent);
  font-weight: 500;
}

/* MFA Setup */
.mfa-qr {
  display: flex;
  justify-content: center;
  margin: var(--space-lg) 0;
}

.mfa-qr img {
  border-radius: var(--radius-md);
}

.mfa-instructions {
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: var(--space-lg);
}

/* ============================================
   Buttons
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-lg);
  border: none;
  border-radius: var(--radius-md);
  font-weight: 500;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-fast);
}

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

.btn-primary:hover {
  background: var(--color-accent-hover);
}

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

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

.btn-full {
  width: 100%;
}

.btn-sm {
  padding: var(--space-xs) var(--space-md);
  font-size: 0.85rem;
}

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

/* ============================================
   Utility Classes
   ============================================ */

.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.mt-auto { margin-top: auto; }
.mb-0 { margin-bottom: 0; }

.badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 8px;
  background: var(--bg-tertiary);
  border-radius: var(--radius-full);
  font-size: 0.75rem;
  font-weight: 500;
}