/**
 * AUTOMOTO.AI - Base Styles
 * Потрібен ВСІМ сторінкам
 * 
 * Включає: CSS змінні, reset, typography, базові елементи
 */

/* ============================================
   CSS Variables (Design Tokens)
   ============================================ */
:root {
  /* Spacing */
  --space-xs: 4px;
  --space-sm: 8px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;
  --space-3xl: 64px;
  --space-4xl: 96px;
  
  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  
  /* Fonts */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
  
  /* Gradients */
  --accent-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  
  /* Material Design 3 - Dark Theme (default) */
  --md-sys-color-surface: #121212;
  --md-sys-color-surface-container: #1E1E1E;
  --md-sys-color-surface-container-high: #2A2A2A;
  --md-sys-color-surface-container-highest: #353535;
  --md-sys-color-surface-container-low: #161616;
  --md-sys-color-surface-container-lowest: #0E0E0E;
  --md-sys-color-on-surface: #E6E1E5;
  --md-sys-color-on-surface-variant: #CAC4D0;
  --md-sys-color-outline: #8E918F;
  --md-sys-color-outline-variant: #444746;
  --md-sys-color-primary: #A8C7FA;
  --md-sys-color-on-primary: #062E6F;
  --md-sys-color-primary-container: #1E4A9D;
  --md-sys-color-on-primary-container: #D5E3FF;
  --md-sys-color-secondary: #C2C8BC;
  --md-sys-color-on-secondary: #2C3227;
  --md-sys-color-secondary-container: #42483D;
  --md-sys-color-on-secondary-container: #DEE4D7;
  --md-sys-color-error: #FFB4AB;
  --md-sys-color-on-error: #690005;
}

/* Light Theme */
[data-theme="light"],
.light-theme {
  --md-sys-color-surface: #FEFBFF;
  --md-sys-color-surface-container: #F3EDF7;
  --md-sys-color-surface-container-high: #ECE6F0;
  --md-sys-color-surface-container-highest: #E6E0E9;
  --md-sys-color-surface-container-low: #F7F2FA;
  --md-sys-color-surface-container-lowest: #FFFFFF;
  --md-sys-color-on-surface: #1C1B1F;
  --md-sys-color-on-surface-variant: #49454F;
  --md-sys-color-outline: #79747E;
  --md-sys-color-outline-variant: #CAC4D0;
  --md-sys-color-primary: #6750A4;
  --md-sys-color-on-primary: #FFFFFF;
  --md-sys-color-primary-container: #EADDFF;
  --md-sys-color-on-primary-container: #21005D;
}

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

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

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--md-sys-color-on-surface);
  background: var(--md-sys-color-surface);
  min-height: 100vh;
}

/* ============================================
   Typography
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  color: var(--md-sys-color-on-surface);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }
h5 { font-size: 1.125rem; }
h6 { font-size: 1rem; }

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

a {
  color: var(--md-sys-color-primary);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  text-decoration: underline;
}

strong {
  font-weight: 600;
}

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--md-sys-color-surface-container-high);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
}

/* ============================================
   Lists
   ============================================ */
ul, ol {
  padding-left: var(--space-xl);
  margin-bottom: var(--space-md);
}

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

/* ============================================
   Images
   ============================================ */
img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-sm);
  padding: 12px 24px;
  border-radius: var(--radius-full);
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  border: none;
  transition: all 0.2s;
}

.btn:hover {
  text-decoration: none;
}

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

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 20px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
  background: var(--md-sys-color-surface-container-high);
  color: var(--md-sys-color-on-surface);
}

.btn-secondary:hover {
  background: var(--md-sys-color-surface-container-highest);
}

.btn-outlined {
  background: transparent;
  border: 1px solid var(--md-sys-color-outline-variant);
  color: var(--md-sys-color-on-surface);
}

.btn-outlined:hover {
  border-color: var(--md-sys-color-primary);
  color: var(--md-sys-color-primary);
}

/* ============================================
   Utilities
   ============================================ */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
}

.text-center { text-align: center; }
.text-muted { color: var(--md-sys-color-outline); }

.hidden { display: none !important; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* ============================================
   Material Icons
   ============================================ */
.material-symbols-rounded {
  font-family: 'Material Symbols Rounded';
  font-weight: normal;
  font-style: normal;
  font-size: 24px;
  line-height: 1;
  letter-spacing: normal;
  text-transform: none;
  display: inline-block;
  white-space: nowrap;
  word-wrap: normal;
  direction: ltr;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  font-feature-settings: 'liga';
  font-variation-settings: 'FILL' 1, 'wght' 400, 'GRAD' 0, 'opsz' 24;
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 768px) {
  h1 { font-size: 2rem; }
  h2 { font-size: 1.5rem; }
  h3 { font-size: 1.25rem; }
}

@media (max-width: 500px) {
  body { font-size: 15px; }
  h1 { font-size: 1.75rem; }
  h2 { font-size: 1.25rem; }
}