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

:root {
  --bg: #ffffff;
  --fg: #111111;
  --card: #ffffff;
  --primary: #171717;
  --primary-fg: #ffffff;
  --secondary: #f5f5f5;
  --muted-fg: #737373;
  --border: #e5e5e5;
  --ring: #a3a3a3;
  --radius: 0.625rem;
}

[data-theme="dark"] {
  --bg: #0a0a0a;
  --fg: #fafafa;
  --card: #141414;
  --primary: #fafafa;
  --primary-fg: #0a0a0a;
  --secondary: #1c1c1c;
  --muted-fg: #a3a3a3;
  --border: #262626;
  --ring: #525252;
}

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: var(--bg);
  color: var(--fg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s, color 0.3s;
}

h1, h2, h3 {
  font-family: 'Crimson Pro', Georgia, serif;
}

.container {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1rem 1rem;
}

.content {
  width: 100%;
  max-width: 42rem;
}

/* Top-right toggle buttons */
.top-toggles {
  position: fixed;
  top: 1rem;
  right: 1rem;
  display: flex;
  gap: 0.5rem;
  z-index: 50;
}

.toggle-btn {
  width: 2.5rem;
  height: 2.5rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: 1px solid var(--border);
  border-radius: 50%;
  cursor: pointer;
  color: var(--fg);
  transition: background 0.2s, border-color 0.2s, color 0.3s;
  font-family: inherit;
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

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

.toggle-btn .icon-sun,
.toggle-btn .icon-moon { display: none; }

[data-theme="dark"] .toggle-btn .icon-sun { display: block; }
:root:not([data-theme="dark"]) .toggle-btn .icon-moon { display: block; }

/* Header */
.header {
  text-align: center;
  margin-bottom: 2rem;
  animation: fadeSlideDown 0.4s ease-out;
}

.header h1 {
  font-size: 2rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  margin-bottom: 0.5rem;
}

.header p {
  color: var(--muted-fg);
  font-size: 0.875rem;
}

/* Search card */
.search-card {
  background: transparent;
  border: none;
  border-radius: var(--radius);
  padding: 0;
  animation: fadeSlideUp 0.4s ease-out 0.05s both;
}

.search-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.search-wrapper {
  position: relative;
  display: flex;
  align-items: center;
  flex: 1;
}

.search-icon {
  position: absolute;
  left: 1rem;
  color: var(--muted-fg);
  pointer-events: none;
  display: flex;
}

.search-input {
  width: 100%;
  height: 3rem;
  padding: 0 2.5rem 0 3rem;
  font-family: inherit;
  font-size: 1rem;
  color: var(--fg);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color 0.2s, box-shadow 0.2s, background 0.3s, color 0.3s;
}

.search-input::placeholder {
  color: var(--muted-fg);
  opacity: 0.7;
}

.search-input:focus {
  border-color: var(--ring);
  box-shadow: 0 0 0 2px var(--secondary);
}

.paste-btn {
  flex-shrink: 0;
  width: 3rem;
  height: 3rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  cursor: pointer;
  color: var(--muted-fg);
  transition: background 0.15s, color 0.15s;
}

.paste-btn:hover {
  color: var(--fg);
}

.clear-btn {
  position: absolute;
  right: 0.75rem;
  width: 1.75rem;
  height: 1.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  border-radius: 50%;
  cursor: pointer;
  color: var(--muted-fg);
  transition: background 0.15s, transform 0.15s;
  opacity: 0;
  transform: scale(0.8);
  pointer-events: none;
}

.clear-btn.visible {
  opacity: 1;
  transform: scale(1);
  pointer-events: auto;
}

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

/* Results */
.results {
  margin-top: 1.5rem;
}

.results h2 {
  font-size: 1.125rem;
  font-weight: 500;
  margin-bottom: 0.75rem;
}

.results-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

/* Site card */
.site-card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: box-shadow 0.2s, transform 0.2s, background 0.3s, border-color 0.3s;
  opacity: 0;
  transform: translateY(0.75rem);
}

.site-card.visible {
  animation: fadeSlideUp 0.25s ease-out forwards;
}

.site-card:hover {
  box-shadow: 0 4px 12px rgb(0 0 0 / 0.06);
  transform: translateY(-2px);
}

[data-theme="dark"] .site-card:hover {
  box-shadow: 0 4px 12px rgb(0 0 0 / 0.3);
}

.site-card-inner {
  padding: 0.75rem 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  cursor: pointer;
}

.site-info {
  flex: 1;
  min-width: 0;
}

.site-name-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.site-dot {
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  flex-shrink: 0;
}

.dot-found { background: #22c55e; }
.dot-not-found { background: #ef4444; }
.dot-unknown { background: #a3a3a3; }
.dot-loading {
  background: #a3a3a3;
  animation: pulse 1.2s ease-in-out infinite;
}

.site-name {
  font-weight: 500;
  font-size: 0.9375rem;
}

/* Empty state */
.empty-state {
  margin-top: 3rem;
  text-align: center;
  animation: fadeIn 0.3s ease-out;
}

.empty-state .icon-circle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 50%;
  background: var(--secondary);
  color: var(--muted-fg);
  margin-bottom: 0.75rem;
  transition: background 0.3s, color 0.3s;
}

.empty-state p {
  color: var(--muted-fg);
  font-size: 0.875rem;
}

/* Toast */
.toast {
  position: fixed;
  bottom: 1.5rem;
  left: 50%;
  transform: translateX(-50%) translateY(120%);
  background: var(--fg);
  color: var(--bg);
  padding: 0.625rem 1rem;
  border-radius: var(--radius);
  font-size: 0.8125rem;
  font-family: inherit;
  box-shadow: 0 4px 12px rgb(0 0 0 / 0.1);
  opacity: 0;
  transition: transform 0.3s ease-out, opacity 0.3s ease-out, background 0.3s, color 0.3s;
  pointer-events: none;
  z-index: 100;
}

.toast.show {
  transform: translateX(-50%) translateY(0);
  opacity: 1;
}

/* Animations */
@keyframes fadeSlideDown {
  from { opacity: 0; transform: translateY(-0.75rem); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(0.75rem); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.3; }
}

.filter-toggle-btn {
  flex-shrink: 0;
  width: 3rem;
  height: 3rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: transparent;
  border: none;
  color: var(--muted-fg);
  cursor: pointer;
  transition: all 0.2s;
}

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

.filter-toggle-btn.active {
  color: var(--fg);
}

.filter-panel {
  margin-top: 0.75rem;
  padding: 1rem 1.25rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  animation: fadeSlideUp 0.2s ease-out;
  transition: background 0.3s, border-color 0.3s;
}

.filter-category {
  margin-bottom: 0.75rem;
}

.filter-category:last-child {
  margin-bottom: 0;
}

.filter-category-header {
  margin-bottom: 0.375rem;
}

.filter-category-header label {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-weight: 500;
  font-size: 0.875rem;
  cursor: pointer;
}

.filter-sites {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
  padding-left: 1.5rem;
}

.filter-sites label {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.8125rem;
  color: var(--muted-fg);
  cursor: pointer;
}

.filter-panel input[type="checkbox"] {
  accent-color: var(--fg);
}

.results-category {
  margin-bottom: 1.5rem;
}

.results-category:last-child {
  margin-bottom: 0;
}

/* Responsive */
@media (min-width: 640px) {
  .container { padding: 1.5rem; }
  .header { margin-bottom: 2.5rem; }
  .header h1 { font-size: 2.25rem; }
  .header p { font-size: 1rem; }
}