/* ============================================================
   MarketTools V3 — Design System
   Marketplace SaaS Style (Ozon/WB inspired, unique identity)
   ============================================================ */

/* === DESIGN TOKENS === */
:root {
  /* Colors */
  --color-primary: #6C3CE0;
  --color-primary-hover: #5A2DC5;
  --color-primary-light: #8B5CF6;
  --color-secondary: #00C853;
  --color-secondary-hover: #00B248;
  --color-accent: #005BFF;
  --color-accent-hover: #0047CC;
  
  --color-bg: #F8F9FA;
  --color-surface: #FFFFFF;
  --color-surface-hover: #F1F3F5;
  
  --color-text: #1A1A1A;
  --color-text-muted: #6B7280;
  --color-text-light: #9CA3AF;
  
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  --color-info: #3B82F6;
  
  /* Gradients */
  --gradient-primary: linear-gradient(135deg, #6C3CE0 0%, #005BFF 100%);
  --gradient-secondary: linear-gradient(135deg, #00C853 0%, #00E676 100%);
  --gradient-accent: linear-gradient(135deg, #005BFF 0%, #00C853 100%);
  
  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  
  /* 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: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --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);
  --shadow-glow: 0 0 20px rgba(108, 60, 224, 0.3);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 250ms ease;
  --transition-slow: 350ms ease;
  
  /* Z-index */
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-modal-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
}

/* === RESET & BASE === */
*, *::before, *::after {
  box-sizing: border-box;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--color-bg);
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* === TYPOGRAPHY === */
h1, h2, h3, h4, h5, h6 {
  margin-top: 0;
  margin-bottom: var(--spacing-md);
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-text);
}

h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }
h5 { font-size: var(--font-size-lg); }
h6 { font-size: var(--font-size-base); }

p {
  margin-top: 0;
  margin-bottom: var(--spacing-md);
}

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

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

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

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

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

/* === BUTTONS === */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  font-size: var(--font-size-base);
  font-weight: 600;
  line-height: 1.5;
  text-align: center;
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  user-select: none;
  white-space: nowrap;
  vertical-align: middle;
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

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

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

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

.btn-primary:hover {
  background: var(--color-primary-hover);
  border-color: var(--color-primary-hover);
  box-shadow: var(--shadow-glow);
}

.btn-secondary {
  background: var(--gradient-secondary);
  color: white;
  border-color: var(--color-secondary);
}

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

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

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

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

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

.btn-ghost {
  background: transparent;
  color: var(--color-text);
  border-color: transparent;
}

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

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

.btn-danger:hover {
  background: #DC2626;
  border-color: #DC2626;
}

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

.btn-lg {
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-lg);
}

.btn-block {
  display: flex;
  width: 100%;
}

/* === CARDS === */
.card {
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  padding: var(--spacing-xl);
  transition: all var(--transition-base);
}

.card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}

.card-header {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-md);
  border-bottom: 1px solid var(--color-bg);
}

.card-title {
  font-size: var(--font-size-xl);
  font-weight: 700;
  margin: 0;
}

.card-body {
  padding: 0;
}

.card-highlighted {
  border: 2px solid var(--color-primary);
  box-shadow: var(--shadow-glow);
}

.card-pricing {
  text-align: center;
  padding: var(--spacing-2xl);
}

.card-pricing .price {
  font-size: var(--font-size-4xl);
  font-weight: 700;
  color: var(--color-primary);
  margin: var(--spacing-lg) 0;
}

.card-result {
  background: var(--color-bg);
  border-left: 4px solid var(--color-success);
}

/* === BADGES === */
.badge {
  display: inline-flex;
  align-items: center;
  padding: var(--spacing-xs) var(--spacing-sm);
  font-size: var(--font-size-xs);
  font-weight: 600;
  line-height: 1;
  text-align: center;
  white-space: nowrap;
  vertical-align: baseline;
  border-radius: var(--radius-full);
  transition: all var(--transition-fast);
}

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

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

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

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

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

/* === INPUTS === */
.form-control {
  display: block;
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  font-size: var(--font-size-base);
  font-weight: 400;
  line-height: 1.5;
  color: var(--color-text);
  background-color: var(--color-surface);
  background-clip: padding-box;
  border: 2px solid var(--color-bg);
  border-radius: var(--radius-lg);
  transition: all var(--transition-fast);
}

.form-control:focus {
  border-color: var(--color-primary);
  outline: 0;
  box-shadow: 0 0 0 3px rgba(108, 60, 224, 0.1);
}

.form-control::placeholder {
  color: var(--color-text-light);
}

.form-control:disabled {
  background-color: var(--color-bg);
  opacity: 1;
  cursor: not-allowed;
}

.form-label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: 600;
  color: var(--color-text);
}

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

/* === ALERTS === */
.alert {
  position: relative;
  padding: var(--spacing-md) var(--spacing-lg);
  margin-bottom: var(--spacing-md);
  border: 1px solid transparent;
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

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

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

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

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

/* === NAVIGATION === */
.navbar {
  background: var(--color-surface);
  box-shadow: var(--shadow-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
}

.navbar-brand {
  font-size: var(--font-size-xl);
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.navbar-brand:hover {
  color: var(--color-primary-hover);
  transform: scale(1.05);
}

.nav-link {
  color: var(--color-text);
  text-decoration: none;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast);
  font-weight: 500;
}

.nav-link:hover {
  color: var(--color-primary);
  background: var(--color-surface-hover);
}

.nav-link.active {
  color: var(--color-primary);
  background: rgba(108, 60, 224, 0.1);
}

/* === LAYOUT === */
.container {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.container-narrow {
  max-width: 768px;
  margin: 0 auto;
  padding: 0 var(--spacing-xl);
}

.main-content {
  min-height: calc(100vh - 80px);
  padding: var(--spacing-2xl) 0;
}

/* === GRID === */
.row {
  display: flex;
  flex-wrap: wrap;
  margin: 0 calc(-1 * var(--spacing-md));
}

.col {
  flex: 1;
  padding: 0 var(--spacing-md);
}

.col-6 {
  flex: 0 0 50%;
  max-width: 50%;
  padding: 0 var(--spacing-md);
}

.col-4 {
  flex: 0 0 33.333%;
  max-width: 33.333%;
  padding: 0 var(--spacing-md);
}

.col-3 {
  flex: 0 0 25%;
  max-width: 25%;
  padding: 0 var(--spacing-md);
}

/* === UTILITIES === */
.text-center {
  text-align: center;
}

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

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

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

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

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

.d-flex {
  display: flex;
}

.d-grid {
  display: grid;
}

.align-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-md); }
.gap-3 { gap: var(--spacing-lg); }

/* === ANIMATIONS === */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

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

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

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

.animate-fade-in {
  animation: fadeIn var(--transition-slow) ease-out;
}

.animate-slide-in {
  animation: slideIn var(--transition-slow) ease-out;
}

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

/* === LOADING STATES === */
.spinner {
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 2px solid var(--color-bg);
  border-top-color: var(--color-primary);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.spinner-lg {
  width: 40px;
  height: 40px;
  border-width: 3px;
}

.skeleton {
  background: linear-gradient(90deg, var(--color-bg) 25%, var(--color-surface-hover) 50%, var(--color-bg) 75%);
  background-size: 200% 100%;
  animation: pulse 1.5s ease-in-out infinite;
  border-radius: var(--radius-md);
}

/* === RESPONSIVE === */
@media (max-width: 1024px) {
  .col-4 {
    flex: 0 0 50%;
    max-width: 50%;
  }
}

@media (max-width: 768px) {
  .container {
    padding: 0 var(--spacing-md);
  }
  
  .col-6, .col-4, .col-3 {
    flex: 0 0 100%;
    max-width: 100%;
  }
  
  h1 { font-size: var(--font-size-3xl); }
  h2 { font-size: var(--font-size-2xl); }
  h3 { font-size: var(--font-size-xl); }
  
  .btn-lg {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: var(--font-size-base);
  }
}

@media (max-width: 480px) {
  .navbar {
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .main-content {
    padding: var(--spacing-lg) 0;
  }
  
  .card {
    padding: var(--spacing-lg);
  }
}

/* === AUTH PAGES (Login/Register) === */
.auth-container {
    min-height: calc(100vh - 80px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
}

.auth-wrapper {
    display: grid;
    grid-template-columns: 1fr 1fr;
    max-width: 1000px;
    width: 100%;
    background: var(--color-surface);
    border-radius: var(--radius-2xl);
    box-shadow: var(--shadow-xl);
    overflow: hidden;
}

.auth-branding {
    background: var(--gradient-primary);
    padding: var(--spacing-3xl);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
}

.auth-branding-content {
    max-width: 400px;
}

.auth-branding-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.auth-branding-subtitle {
    font-size: var(--font-size-lg);
    opacity: 0.9;
    margin-bottom: var(--spacing-2xl);
}

.auth-features {
    list-style: none;
    padding: 0;
    margin: 0;
}

.auth-features li {
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-md);
    opacity: 0.95;
}

.auth-form-container {
    padding: var(--spacing-3xl);
    display: flex;
    align-items: center;
    justify-content: center;
}

.auth-form-wrapper {
    max-width: 400px;
    width: 100%;
}

.auth-form-header {
    margin-bottom: var(--spacing-2xl);
}

.auth-form-header h2 {
    font-size: var(--font-size-3xl);
    margin-bottom: var(--spacing-sm);
}

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

.password-input-wrapper {
    position: relative;
}

.password-toggle {
    position: absolute;
    right: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-size: var(--font-size-sm);
    color: var(--color-text-muted);
}

.auth-form-footer {
    margin-top: var(--spacing-xl);
    text-align: center;
    font-size: var(--font-size-sm);
}

.auth-form-footer a {
    color: var(--color-primary);
    text-decoration: none;
    font-weight: 600;
}

.auth-form-footer a:hover {
    text-decoration: underline;
}

.form-error {
    color: var(--color-error);
    font-size: var(--font-size-sm);
    margin-top: var(--spacing-xs);
}

.is-invalid {
    border-color: var(--color-error) !important;
}

.auth-bonus-card {
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-2xl);
    backdrop-filter: blur(10px);
}

.bonus-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.auth-bonus-card h3 {
    font-size: var(--font-size-xl);
    margin-bottom: var(--spacing-sm);
}

.auth-bonus-card p {
    font-size: var(--font-size-sm);
    opacity: 0.9;
    margin: 0;
}

@media (max-width: 768px) {
    .auth-wrapper {
        grid-template-columns: 1fr;
    }
    
    .auth-branding {
        padding: var(--spacing-2xl);
    }
    
    .auth-form-container {
        padding: var(--spacing-2xl);
    }
}

/* === LANDING PAGE FEATURE CARDS === */
.feature-icon {
    font-size: 3rem;
    color: var(--color-primary);
    margin-bottom: var(--spacing-lg);
}

.feature-title {
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--color-text);
}

.feature-desc {
    color: var(--color-text-muted);
    margin-bottom: var(--spacing-lg);
    line-height: 1.6;
}

.feature-price {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    color: var(--color-primary);
}

.price-badge {
    font-size: 1.25rem;
    font-weight: bold;
    color: #198754;
}

.step-number {
    width: 40px;
    height: 40px;
    background: #0d6efd;
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    margin-right: 1rem;
    flex-shrink: 0;
}