/*
 * Barganha 360 Design System v4.0
 * OLX-inspired marketplace • Green palette
 * Palette: #468e10 #357d0c #236c08 #125b04 #004a00
 */

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:ital,opsz,wght@0,9..40,300;0,9..40,400;0,9..40,500;0,9..40,600;0,9..40,700&family=JetBrains+Mono:wght@400;500;700&family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

:root {
  /* ===== Brand Colors (Green Palette) ===== */
  --primary: #468e10;
  --primary-hover: #3a7a0d;
  --primary-dark: #357d0c;
  --primary-darker: #236c08;
  --primary-darkest: #125b04;
  --primary-deep: #004a00;
  --primary-50: #f0f9e8;
  --primary-100: #d4edbc;
  --primary-200: #a8d86e;
  --primary-300: #7cc120;
  --primary-400: #5faa16;
  --primary-light: #6db330;
  --primary-rgb: 70, 142, 16;

  /* ===== Semantic Colors ===== */
  --success: #22c55e;
  --success-dark: #16a34a;
  --danger: #ef4444;
  --danger-dark: #dc2626;
  --warning: #f59e0b;
  --warning-dark: #d97706;
  --info: #3b82f6;
  --info-dark: #2563eb;

  /* ===== Neutrals ===== */
  --white: #ffffff;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-700: #334155;
  --gray-800: #1e293b;
  --gray-900: #0f172a;
  --gray-950: #020617;

  /* ===== Surfaces ===== */
  --bg-body: #f5f7fa;
  --bg-surface: #ffffff;
  --bg-surface-raised: #ffffff;
  --bg-surface-overlay: rgba(0,0,0,0.5);
  --bg-dark: #0f172a;
  --bg-dark-surface: #1e293b;

  /* ===== Text ===== */
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-tertiary: #94a3b8;
  --text-inverse: #ffffff;
  --text-link: var(--primary);

  /* ===== Borders ===== */
  --border-default: #e2e8f0;
  --border-strong: #cbd5e1;
  --border-focus: var(--primary);

  /* ===== Typography ===== */
  --font-display: 'Plus Jakarta Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-body: 'DM Sans', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  --font-size-2xs: 0.625rem;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.8125rem;
  --font-size-base: 0.9375rem;
  --font-size-md: 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;
  --font-size-5xl: 3rem;
  --font-size-6xl: 3.75rem;
  --weight-light: 300;
  --weight-normal: 400;
  --weight-medium: 500;
  --weight-semibold: 600;
  --weight-bold: 700;
  --weight-extrabold: 800;
  --leading-tight: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --tracking-tight: -0.03em;
  --tracking-normal: 0;
  --tracking-wide: 0.025em;

  /* ===== Spacing (4px base) ===== */
  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* ===== Border Radius ===== */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --radius-xl: 20px;
  --radius-2xl: 28px;
  --radius-full: 9999px;

  /* ===== Shadows ===== */
  --shadow-xs: 0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.08), 0 8px 10px -6px rgba(0,0,0,0.04);
  --shadow-card: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-card-hover: 0 8px 25px rgba(0,0,0,0.1);
  --shadow-green: 0 4px 14px rgba(70, 142, 16, 0.3);
  --primary-rgb: 70, 142, 16;

  /* ===== Transitions ===== */
  --ease-default: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);
  --duration-fast: 120ms;
  --duration-normal: 200ms;
  --duration-slow: 300ms;

  /* ===== Z-Index ===== */
  --z-base: 0;
  --z-dropdown: 1000;
  --z-sticky: 1020;
  --z-fixed: 1030;
  --z-backdrop: 1040;
  --z-modal: 1050;
  --z-popover: 1060;
  --z-tooltip: 1070;
  --z-toast: 1080;

  /* ===== Layout ===== */
  --container-max: 1400px;
  --header-height: 64px;
  --category-nav-height: 48px;
}

/* ===== Dark Mode ===== */
html.dark {
  --bg-body: #0f172a;
  --bg-surface: #1e293b;
  --bg-surface-raised: #273548;
  --bg-dark: #020617;
  --bg-dark-surface: #0f172a;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-tertiary: #64748b;
  --border-default: #334155;
  --border-strong: #475569;
  --gray-50: #1e293b;
  --gray-100: #273548;
  --gray-200: #334155;
  --gray-300: #475569;
  --gray-700: #cbd5e1;
  --gray-800: #e2e8f0;
  --gray-900: #f1f5f9;
}

html.dark body {
  background-color: var(--bg-body);
  color: var(--text-primary);
}

html.dark .card,
html.dark .section-card,
html.dark .auth-card,
html.dark .filter-section {
  background-color: var(--bg-surface);
  border-color: var(--border-default);
  color: var(--text-primary);
}

html.dark .site-header {
  background: var(--bg-surface);
  border-color: var(--border-default);
}

html.dark .category-nav {
  background: var(--bg-surface);
  border-color: var(--border-default);
}

html.dark .site-footer {
  background: var(--bg-dark);
}

html.dark .modal-content {
  background-color: var(--bg-surface);
  color: var(--text-primary);
}

html.dark .dropdown-menu {
  background-color: var(--bg-surface);
  border-color: var(--border-default);
}

html.dark .dropdown-item {
  color: var(--text-primary);
}

html.dark .dropdown-item:hover {
  background-color: var(--gray-100);
}

html.dark .form-control,
html.dark .form-select {
  background-color: var(--gray-100);
  border-color: var(--border-default);
  color: var(--text-primary);
}

html.dark .chat-message.sent .message-bubble {
  background: var(--primary-dark);
}

html.dark .chat-message.received .message-bubble {
  background: var(--gray-100);
  border-color: var(--border-default);
}

html.dark a.ad-card,
html.dark .card.ad-card {
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2), 0 1px 2px rgba(0, 0, 0, 0.15);
}

html.dark a.ad-card:hover,
html.dark .card.ad-card:hover {
  box-shadow: 0 4px 12px rgba(var(--primary-rgb), 0.2), 0 2px 6px rgba(0, 0, 0, 0.2);
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-body);
  font-size: var(--font-size-base);
  line-height: var(--leading-normal);
  color: var(--text-primary);
  background-color: var(--bg-body);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

main {
  flex: 1;
}

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

a {
  color: var(--text-link);
  text-decoration: none;
  transition: color var(--duration-fast) var(--ease-default);
}

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

/* ===== Focus States ===== */
:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

/* ===== Lazy Loading ===== */
img[loading="lazy"] {
  transition: opacity var(--duration-slow) var(--ease-out);
}

/* ===== Skeleton Loading ===== */
.skeleton {
  background: linear-gradient(90deg, var(--gray-200) 25%, var(--gray-100) 50%, var(--gray-200) 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s infinite;
  border-radius: var(--radius-md);
}

@keyframes skeleton-shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ===== OAuth Buttons ===== */
.oauth-buttons-row {
  display: flex;
  gap: 12px;
  justify-content: center;
}
.oauth-btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 48px;
  border-radius: var(--radius-md);
  border: 2px solid var(--gray-200);
  background: var(--white);
  color: var(--text-primary);
  text-decoration: none;
  transition: all var(--duration-fast) var(--ease-default);
  cursor: pointer;
}
.oauth-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}
.oauth-google {
  border-color: var(--gray-200);
}
.oauth-google:hover {
  border-color: #4285F4;
  box-shadow: 0 4px 12px rgba(66, 133, 244, 0.2);
}
.oauth-facebook {
  background: #1877F2;
  border-color: #1877F2;
  color: white;
}
.oauth-facebook:hover {
  background: #166FE5;
  border-color: #166FE5;
  box-shadow: 0 4px 12px rgba(24, 119, 242, 0.3);
}
.oauth-github {
  background: #24292e;
  border-color: #24292e;
  color: white;
}
.oauth-github:hover {
  background: #2f363d;
  border-color: #2f363d;
  box-shadow: 0 4px 12px rgba(36, 41, 46, 0.3);
}