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

:root {
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --primary-light: #dbeafe;
  --accent: #16a34a;
  --accent-light: #dcfce7;
  --danger: #dc2626;
  --danger-light: #fee2e2;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-400: #9ca3af;
  --gray-500: #6b7280;
  --gray-600: #4b5563;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --white: #ffffff;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.07), 0 2px 4px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1), 0 4px 6px rgba(0,0,0,0.05);
  --radius: 8px;
  --radius-lg: 12px;
  --max-width: 1200px;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  color: var(--gray-800);
  background: var(--gray-50);
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a:hover {
  text-decoration: underline;
}

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

ul, ol {
  list-style: none;
}

button {
  cursor: pointer;
  border: none;
  font-family: inherit;
  font-size: inherit;
}

/* ========== HEADER / NAV ========== */
.site-header {
  background: var(--white);
  border-bottom: 1px solid var(--gray-200);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.logo {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

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

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

.nav-links {
  display: flex;
  gap: 1.5rem;
  align-items: center;
}

.nav-links a {
  color: var(--gray-600);
  font-size: 0.9rem;
  font-weight: 500;
  transition: color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--primary);
  text-decoration: none;
}

.menu-toggle {
  display: none;
  background: none;
  padding: 0.5rem;
  color: var(--gray-700);
}

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

/* ========== FOOTER ========== */
.site-footer {
  background: var(--gray-800);
  color: var(--gray-300);
  margin-top: auto;
  padding: 2rem 1rem;
}

.footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 2rem;
}

.footer-section h4 {
  color: var(--white);
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
}

.footer-section a {
  color: var(--gray-400);
  font-size: 0.85rem;
  display: block;
  margin-bottom: 0.4rem;
}

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

.footer-bottom {
  max-width: var(--max-width);
  margin: 1.5rem auto 0;
  padding-top: 1.5rem;
  border-top: 1px solid var(--gray-700);
  text-align: center;
  font-size: 0.8rem;
  color: var(--gray-500);
}

.footer-bottom a {
  color: var(--primary);
}

/* ========== CONTAINERS ========== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1rem;
}

.page-title {
  font-size: 1.75rem;
  font-weight: 700;
  margin-bottom: 1.5rem;
  color: var(--gray-900);
}

/* ========== CARDS ========== */
.card {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
  transition: box-shadow 0.2s, transform 0.2s;
}

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

/* ========== BUTTONS ========== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.9rem;
  transition: background 0.2s, transform 0.1s;
}

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

.btn:active {
  transform: scale(0.98);
}

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

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

.btn-secondary {
  background: var(--gray-100);
  color: var(--gray-700);
  border: 1px solid var(--gray-300);
}

.btn-secondary:hover {
  background: var(--gray-200);
}

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

.btn-accent:hover {
  background: #15803d;
}

.btn-sm {
  padding: 0.4rem 0.75rem;
  font-size: 0.8rem;
}

.btn-lg {
  padding: 0.75rem 1.75rem;
  font-size: 1rem;
}

/* ========== BADGES ========== */
.badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 999px;
  font-size: 0.75rem;
  font-weight: 600;
}

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

.badge-accent {
  background: var(--accent-light);
  color: #15803d;
}

/* ========== FORMS ========== */
.form-group {
  margin-bottom: 1rem;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gray-700);
  margin-bottom: 0.35rem;
}

.form-control {
  width: 100%;
  padding: 0.5rem 0.75rem;
  border: 1px solid var(--gray-300);
  border-radius: var(--radius);
  font-size: 0.9rem;
  font-family: inherit;
  transition: border-color 0.2s;
}

.form-control:focus {
  outline: none;
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-light);
}

.checkbox-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.checkbox-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--gray-700);
  cursor: pointer;
}

.checkbox-label input[type="checkbox"] {
  accent-color: var(--primary);
  width: 16px;
  height: 16px;
}

/* ========== RATING STARS ========== */
.rating {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  color: #f59e0b;
  font-size: 0.9rem;
}

.rating .count {
  color: var(--gray-500);
  font-size: 0.8rem;
}

/* ========== COMPARISON BAR ========== */
.compare-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--white);
  border-top: 2px solid var(--primary);
  box-shadow: 0 -4px 12px rgba(0,0,0,0.1);
  padding: 0.75rem 1rem;
  z-index: 99;
  transform: translateY(100%);
  transition: transform 0.3s ease;
}

.compare-bar.visible {
  transform: translateY(0);
}

.compare-bar-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.compare-items {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  flex: 1;
  overflow-x: auto;
}

.compare-item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: var(--gray-100);
  border-radius: var(--radius);
  padding: 0.4rem 0.6rem;
  font-size: 0.8rem;
  white-space: nowrap;
}

.compare-item img {
  width: 32px;
  height: 32px;
  object-fit: contain;
  border-radius: 4px;
}

.compare-item .remove {
  background: none;
  color: var(--gray-400);
  padding: 0;
  font-size: 1.1rem;
  line-height: 1;
}

.compare-item .remove:hover {
  color: var(--danger);
}

.compare-actions {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}

/* ========== AFFILIATE BANNERS ========== */
.affiliate-links {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.affiliate-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--white);
  transition: opacity 0.2s;
}

.affiliate-btn:hover {
  opacity: 0.9;
  text-decoration: none;
}

.affiliate-btn.cobasi {
  background: #00a651;
}

.affiliate-btn.petlove {
  background: #ff6b35;
}

.affiliate-btn.petz {
  background: #0077c8;
}

/* ========== UTILITIES ========== */
.text-center { text-align: center; }
.text-sm { font-size: 0.85rem; }
.text-muted { color: var(--gray-500); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.flex { display: flex; }
.flex-wrap { flex-wrap: wrap; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }
.hidden { display: none !important; }

/* ========== HIGHLIGHT VALUES (comparison) ========== */
.value-best {
  color: var(--accent);
  font-weight: 700;
}

.value-worst {
  color: var(--danger);
  font-weight: 700;
}

/* ========== RESPONSIVE ========== */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--white);
    flex-direction: column;
    padding: 1rem;
    border-bottom: 1px solid var(--gray-200);
    box-shadow: var(--shadow-md);
  }

  .nav-links.open {
    display: flex;
  }

  .menu-toggle {
    display: block;
  }

  .page-title {
    font-size: 1.35rem;
  }

  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .footer-inner {
    grid-template-columns: 1fr;
  }
}