:root {
  --color-bg: #0f172a;
  --color-surface: #1e293b;
  --color-surface-alt: #111827;
  --color-text: #f8fafc;
  --color-muted: #94a3b8;
  --color-accent: #38bdf8;
  --color-danger: #f87171;
  --color-success: #4ade80;
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --radius-md: 12px;
  --radius-lg: 24px;
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  min-height: 100vh;
  display: flex;
  justify-content: center;
}

body.light {
  --color-bg: #f8fafc;
  --color-surface: #ffffff;
  --color-surface-alt: #e2e8f0;
  --color-text: #0f172a;
  --color-muted: #64748b;
  --color-accent: #0284c7;
  --color-danger: #dc2626;
  --color-success: #16a34a;
}

#app {
  width: min(480px, 100%);
  background: var(--color-surface);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  padding: var(--spacing-lg) var(--spacing-md) var(--spacing-md);
  background: var(--color-surface-alt);
  position: sticky;
  top: 0;
  z-index: 10;
}

header h1 {
  margin: 0;
  font-size: 1.5rem;
}

.share-debug {
  margin: var(--spacing-md);
  margin-top: var(--spacing-md);
  background: rgba(56, 189, 248, 0.12);
  border: 1px solid rgba(56, 189, 248, 0.35);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  display: grid;
  gap: var(--spacing-sm);
  color: var(--color-text);
}

body.light .share-debug {
  background: rgba(2, 132, 199, 0.1);
  border-color: rgba(2, 132, 199, 0.4);
}

.share-debug__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--spacing-sm);
}

.share-debug__meta,
.share-debug__hint {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-muted);
}

.share-debug__status {
  margin: 0;
  font-size: 0.9rem;
  color: var(--color-text);
  font-weight: 500;
}

.share-debug__details {
  margin: 0;
  display: grid;
  gap: var(--spacing-xs);
}

.share-debug__row {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: var(--spacing-sm);
  align-items: baseline;
}

.share-debug__row dt {
  font-weight: 600;
  font-size: 0.85rem;
}

.share-debug__row dd {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-text);
}

.share-debug__row code {
  background: transparent;
  padding: 0;
  color: inherit;
  word-break: break-word;
  white-space: pre-wrap;
}

.share-debug__dismiss {
  white-space: nowrap;
}

main {
  flex: 1;
  overflow-y: auto;
  padding: var(--spacing-md);
  padding-bottom: 5.5rem;
}

button,
input,
select,
textarea {
  font: inherit;
}

button {
  background: var(--color-accent);
  color: #fff;
  border: none;
  border-radius: 999px;
  padding: var(--spacing-sm) var(--spacing-md);
  cursor: pointer;
  transition: transform 0.2s ease, opacity 0.2s ease;
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

button.secondary {
  background: transparent;
  border: 1px solid var(--color-muted);
  color: var(--color-text);
}

button.danger {
  background: var(--color-danger);
}

.fab {
  position: fixed;
  right: var(--spacing-lg);
  bottom: 5rem;
  width: 56px;
  height: 56px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 2rem;
  box-shadow: 0 10px 24px rgba(15, 23, 42, 0.35);
  z-index: 15;
}

.tab-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  background: var(--color-surface-alt);
  border-top: 1px solid rgba(148, 163, 184, 0.2);
  position: sticky;
  bottom: 0;
  z-index: 12;
}

.tab-bar button {
  background: none;
  border: none;
  color: var(--color-muted);
  padding: var(--spacing-md) var(--spacing-sm);
  border-radius: 0;
}

.tab-bar button.active {
  color: var(--color-accent);
  font-weight: 600;
}

.link-card {
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  padding: var(--spacing-md);
  margin-bottom: var(--spacing-md);
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: var(--spacing-md);
}

.links-controls {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
  flex-wrap: wrap;
}

.sorter-label {
  display: grid;
  gap: var(--spacing-xs);
  font-size: 0.85rem;
  color: var(--color-muted);
}

.sorter-label select {
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--radius-md);
  border: 1px solid rgba(148, 163, 184, 0.4);
  background: var(--color-surface-alt);
  color: var(--color-text);
}

.link-card .favicon {
  width: 48px;
  height: 48px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 1rem;
  background: rgba(56, 189, 248, 0.15);
  color: var(--color-accent);
}

.link-card h3 {
  margin: 0;
  font-size: 1rem;
}

.link-card p {
  margin: var(--spacing-xs) 0 0;
  color: var(--color-muted);
  word-break: break-all;
  font-size: 0.85rem;
}

.link-card .actions {
  margin-top: var(--spacing-sm);
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
}

.domain-group {
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-md);
  overflow: hidden;
}

.domain-group summary {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  cursor: pointer;
  padding: var(--spacing-md);
  font-weight: 600;
  list-style: none;
}

.domain-group summary::-webkit-details-marker,
.domain-group summary::marker {
  display: none;
}

.domain-group summary::after {
  content: '▸';
  color: var(--color-muted);
  transition: transform 0.2s ease;
}

.domain-group[open] summary::after {
  transform: rotate(90deg);
}

.domain-group .domain-name {
  flex: 1;
}

.domain-group .domain-count {
  color: var(--color-muted);
  font-size: 0.85rem;
  margin-right: var(--spacing-xs);
}

.domain-links {
  padding: 0 var(--spacing-md) var(--spacing-md);
  display: grid;
  gap: var(--spacing-md);
}

.domain-links .link-card {
  margin-bottom: 0;
}

.search-input {
  width: 100%;
  border-radius: 999px;
  border: none;
  padding: var(--spacing-sm) var(--spacing-md);
  background: rgba(148, 163, 184, 0.1);
  color: var(--color-text);
  margin-bottom: var(--spacing-md);
}

.filter-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.75);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 100;
}

.modal-backdrop.active {
  display: flex;
}

.modal {
  background: var(--color-surface);
  padding: var(--spacing-lg);
  border-radius: var(--radius-lg);
  width: min(420px, 90%);
  display: grid;
  gap: var(--spacing-md);
}

.modal h2 {
  margin: 0;
}

.modal label {
  font-size: 0.85rem;
  color: var(--color-muted);
}

.modal input,
.modal textarea {
  width: 100%;
  background: var(--color-surface-alt);
  border: none;
  border-radius: var(--radius-md);
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-text);
}

.modal .actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-sm);
}

.empty-state {
  text-align: center;
  padding: var(--spacing-xl) var(--spacing-md);
  color: var(--color-muted);
}

.toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  background: var(--color-surface-alt);
  margin-bottom: var(--spacing-md);
}

.toggle .label {
  display: grid;
  gap: var(--spacing-xs);
}

.toggle input[type="checkbox"] {
  width: 42px;
  height: 24px;
}

.storage-stats {
  background: var(--color-surface-alt);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  display: grid;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-md);
}

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-xs);
  margin-top: var(--spacing-xs);
}

.tag {
  background: rgba(56, 189, 248, 0.15);
  color: var(--color-accent);
  border-radius: 999px;
  padding: 2px 8px;
  font-size: 0.75rem;
}

.link-card h3 a {
  color: inherit;
  text-decoration: none;
}

.link-card h3 a:hover,
.link-card h3 a:focus {
  color: var(--color-accent);
  text-decoration: underline;
}

@media (min-width: 600px) {
  body {
    background: linear-gradient(135deg, #0f172a, #1e293b);
  }
}