/* Base Styles – Credit Card Merchant Offers (cc-offers.com) */
:root {
  --primary-color: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary-color: #1e293b;
  --accent-color: #059669;
  --accent-hover: #047857;
  --light-gray: #f1f5f9;
  --medium-gray: #e2e8f0;
  --dark-gray: #64748b;
  --text-color: #334155;
  --card-shadow: 0 1px 3px rgba(0,0,0,0.08);
  --hover-shadow: 0 4px 12px rgba(0,0,0,0.12);
  --radius: 10px;
  --radius-sm: 6px;
  --bg: #f1f5f9;
  --surface: #fff;
  --surface-alt: #f1f5f9;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --input-bg: #fff;
  --filter-btn-hover: #e2e8f0;
}

/* Dark theme – system preference (when no manual override) */
@media (prefers-color-scheme: dark) {
  html:not([data-theme]) {
    --primary-color: #60a5fa;
    --primary-dark: #3b82f6;
    --secondary-color: #e2e8f0;
    --accent-color: #34d399;
    --accent-hover: #10b981;
    --light-gray: #1e293b;
    --medium-gray: #334155;
    --dark-gray: #94a3b8;
    --text-color: #e2e8f0;
    --card-shadow: 0 1px 3px rgba(0,0,0,0.3);
    --hover-shadow: 0 4px 12px rgba(0,0,0,0.4);
    --bg: #0f172a;
    --surface: #1e293b;
    --surface-alt: #334155;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --input-bg: #1e293b;
    --filter-btn-hover: #475569;
  }
}

/* Dark theme – manual override */
html[data-theme="dark"] {
  --primary-color: #60a5fa;
  --primary-dark: #3b82f6;
  --secondary-color: #e2e8f0;
  --accent-color: #34d399;
  --accent-hover: #10b981;
  --light-gray: #1e293b;
  --medium-gray: #334155;
  --dark-gray: #94a3b8;
  --text-color: #e2e8f0;
  --card-shadow: 0 1px 3px rgba(0,0,0,0.3);
  --hover-shadow: 0 4px 12px rgba(0,0,0,0.4);
  --bg: #0f172a;
  --surface: #1e293b;
  --surface-alt: #334155;
  --text-muted: #94a3b8;
  --border-color: #334155;
  --input-bg: #1e293b;
  --filter-btn-hover: #475569;
}

/* Light theme – manual override (e.g. user on dark system wants light) */
html[data-theme="light"] {
  --primary-color: #2563eb;
  --primary-dark: #1d4ed8;
  --secondary-color: #1e293b;
  --accent-color: #059669;
  --accent-hover: #047857;
  --light-gray: #f1f5f9;
  --medium-gray: #e2e8f0;
  --dark-gray: #64748b;
  --text-color: #334155;
  --card-shadow: 0 1px 3px rgba(0,0,0,0.08);
  --hover-shadow: 0 4px 12px rgba(0,0,0,0.12);
  --bg: #f1f5f9;
  --surface: #fff;
  --surface-alt: #f1f5f9;
  --text-muted: #64748b;
  --border-color: #e2e8f0;
  --input-bg: #fff;
  --filter-btn-hover: #e2e8f0;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
  background-color: var(--bg);
  color: var(--text-color);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 24px 20px;
}

/* Header */
header {
  text-align: center;
  margin-bottom: 24px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}

.logo-icon {
  width: 180px;
  height: 180px;
  object-fit: contain;
}

h1 {
  color: var(--secondary-color);
  margin-bottom: 8px;
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.02em;
}

.tagline {
  color: var(--dark-gray);
  font-size: 1.05rem;
}

/* Disclaimer */
.disclaimer-inline {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin: -0.5rem 0 1rem 0;
}

.disclaimer {
  background-color: var(--surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  margin-bottom: 24px;
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.55;
  box-shadow: var(--card-shadow);
}

.disclaimer p {
  margin: 0;
}

.disclaimer strong {
  color: var(--text-color);
}

.disclaimer-footer {
  font-size: 0.85em;
  margin-top: 5px;
  color: var(--dark-gray);
}

/* Search Bar */
.search-container {
  margin-bottom: 20px;
}

.search-input {
  width: 100%;
  padding: 14px 18px;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  background-color: var(--input-bg);
  color: var(--text-color);
  box-shadow: var(--card-shadow);
  transition: border-color 0.2s, box-shadow 0.2s;
}

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

.search-input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

/* Filter Buttons */
.filter-container {
  margin-bottom: 30px;
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
}

.filter-btn {
  background-color: var(--surface-alt);
  border: 1px solid var(--border-color);
  color: var(--text-color);
  border-radius: 20px;
  padding: 8px 15px;
  cursor: pointer;
  font-size: 14px;
  transition: all 0.2s;
}

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

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

/* Merchant Cards */
.merchant-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin-bottom: 40px;
}

.merchant-card {
  background-color: var(--surface);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  padding: 20px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  position: relative;
  border: 1px solid var(--border-color);
  display: flex;
  flex-direction: column;
}

.merchant-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--hover-shadow);
}

.merchant-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 12px;
}

.merchant-name {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--secondary-color);
  line-height: 1.3;
  flex: 1;
  min-width: 0;
}

.offer-preview {
  margin: 12px 0;
  padding: 12px 0;
  border-top: 1px dashed var(--border-color);
  border-bottom: 1px dashed var(--border-color);
  text-align: center;
}

.best-offer {
  font-weight: 600;
  color: var(--accent-color);
  font-size: 1rem;
  line-height: 1.4;
}

.toggle-btn {
  background-color: var(--accent-color);
  color: #022c22;
  border: none;
  border-radius: var(--radius-sm);
  padding: 8px 14px;
  cursor: pointer;
  font-size: 0.8125rem;
  font-weight: 600;
  transition: background-color 0.2s, color 0.2s;
  flex-shrink: 0;
}

.toggle-btn:hover {
  background-color: var(--accent-hover);
  color: #011c16;
}

.toggle-btn.is-open {
  background-color: var(--primary-color);
  color: #fff;
}

.toggle-btn.is-open:hover {
  color: #e0e7ff;
}

/* Offer Details */
.offer-details {
  display: none;
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border-color);
}

.offer-row {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 8px;
  padding: 10px 12px;
  border-radius: var(--radius-sm);
}

.offer-row:last-child {
  margin-bottom: 0;
}

.offer-row:nth-child(odd) {
  background-color: var(--surface-alt);
}

.card-name {
  font-weight: 600;
  color: var(--secondary-color);
  flex: 0 0 120px;
  min-width: 0;
  font-size: 0.9rem;
}

.offer-value {
  font-weight: 600;
  color: var(--accent-color);
  flex: 1;
  min-width: 0;
  text-align: right;
  font-size: 0.9rem;
  line-height: 1.35;
}

.expiry {
  color: var(--dark-gray);
  font-size: 0.85em;
  font-weight: normal;
}

/* Loading State */
.loading {
  text-align: center;
  font-size: 18px;
  color: var(--dark-gray);
  padding: 40px 0;
}

.no-results {
  text-align: center;
  font-size: 18px;
  color: var(--text-muted);
  padding: 40px 0;
  background-color: var(--surface);
  border-radius: 8px;
  box-shadow: var(--card-shadow);
  margin: 20px 0;
}

/* Footer */
footer {
  text-align: center;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  color: var(--text-muted);
  font-size: 0.9rem;
}

footer a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
}

footer a:hover {
  text-decoration: underline;
}

.footer-links {
  margin-top: 10px;
}

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

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

.separator {
  margin: 0 10px;
}

/* Extension promo - one liner */
.extension-promo {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  padding: 0.6rem 1rem;
  margin-bottom: 1rem;
  font-size: 0.9rem;
}

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

.extension-promo .promo-button {
  color: var(--accent-color);
  font-weight: 600;
  text-decoration: none;
  transition: color 0.2s;
}

.extension-promo .promo-button:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

/* Theme toggle */
.nav-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  margin: 1rem 0;
  flex-wrap: wrap;
}

.theme-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-color);
  font-size: 0.85rem;
  padding: 0.25rem 0;
}

.theme-toggle-track {
  position: relative;
  width: 48px;
  height: 24px;
  background: var(--surface-alt);
  border: 1px solid var(--border-color);
  border-radius: 12px;
  transition: background 0.2s, border-color 0.2s;
}

.theme-toggle:hover .theme-toggle-track {
  border-color: var(--accent-color);
}

.theme-toggle-knob {
  position: absolute;
  top: 2px;
  left: 2px;
  width: 18px;
  height: 18px;
  background: var(--accent-color);
  border-radius: 50%;
  transition: transform 0.25s ease;
  box-shadow: 0 1px 3px rgba(0,0,0,0.2);
}

html[data-theme="dark"] .theme-toggle-knob {
  transform: translateX(26px);
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme]) .theme-toggle-knob { transform: translateX(26px); }
}

.theme-toggle .theme-label-light,
.theme-toggle .theme-label-dark {
  font-weight: 500;
}

.theme-toggle .theme-label-light { opacity: 1; }
.theme-toggle .theme-label-dark { opacity: 0.5; }

html[data-theme="dark"] .theme-toggle .theme-label-light { opacity: 0.5; }
html[data-theme="dark"] .theme-toggle .theme-label-dark { opacity: 1; }

@media (prefers-color-scheme: dark) {
  html:not([data-theme]) .theme-toggle .theme-label-light { opacity: 0.5; }
  html:not([data-theme]) .theme-toggle .theme-label-dark { opacity: 1; }
}

.nav-links a {
  color: var(--accent-color);
  text-decoration: none;
  margin: 0 1rem;
  font-weight: bold;
}

.nav-links a:hover {
  text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
  .merchant-list {
      grid-template-columns: 1fr;
  }
  
  .filter-container {
      flex-direction: column;
      align-items: flex-start;
  }
  
  .filter-container span {
      margin-bottom: 10px;
  }
  
  .merchant-header {
      flex-direction: column;
      align-items: flex-start;
  }
  
  .toggle-btn {
      margin-top: 10px;
      width: 100%;
  }
  
  .disclaimer {
      font-size: 0.8em;
  }

  .logo-icon {
    width: 140px;
    height: 140px;
  }

}