:root {
  --bg: #fafaf7;
  --surface: #ffffff;
  --surface-muted: #f4f4ef;
  --border: #e5e5df;
  --border-strong: #d5d5cc;
  --text: #1f2328;
  --text-muted: #5b6570;
  --text-faint: #8a929c;
  --accent: #2563eb;
  --accent-soft: #e6efff;
  --danger: #b0413e;
  --danger-soft: #fbeceb;
  --tag-bg: #eef2f7;
  --tag-bg-active: #dbe6fb;
  --tag-text: #364152;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 2px 8px rgba(15, 23, 42, 0.06);
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: var(--font-sans);
  color: var(--text);
  background: var(--bg);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

main {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 20px 48px;
}

.site-header {
  max-width: 820px;
  margin: 0 auto;
  padding: 40px 20px 20px;
}

.header-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.header-brand {
  flex: 1 1 auto;
  min-width: 0;
}

.site-header h1 {
  margin: 0;
  font-size: 28px;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.site-header .tagline {
  margin: 4px 0 0;
  color: var(--text-muted);
  font-size: 14px;
}

.auth-area {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-shrink: 0;
}

.auth-area:empty {
  display: none;
}

.auth-email {
  font-size: 13px;
  color: var(--text-muted);
  max-width: 220px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.auth-btn {
  padding: 6px 12px;
  font-size: 13px;
}

.auth-hint {
  font-size: 12px;
  color: var(--text-muted);
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--surface-muted);
  border: 1px solid var(--border);
  cursor: help;
}

.auth-hint-error {
  color: var(--danger);
  background: var(--danger-soft);
  border-color: transparent;
}

.mode-banner {
  margin-top: 14px;
  padding: 8px 12px;
  font-size: 12px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--surface-muted);
  color: var(--text-muted);
}

.mode-banner.is-local {
  background: #fff7ed;
  border-color: #fde3c6;
  color: #8a5a1e;
}

.mode-banner.is-cloud {
  background: #ecfdf5;
  border-color: #c6ebd8;
  color: #1a6b46;
}

.site-footer {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 20px 32px;
  color: var(--text-faint);
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.site-credit {
  color: var(--text-faint);
  font-size: 11px;
  letter-spacing: 0.01em;
}

.app-version {
  display: inline-block;
  margin-left: 6px;
  padding: 1px 8px;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas,
    "Liberation Mono", monospace;
  font-size: 10px;
  color: var(--text-muted);
  background: var(--surface-muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  cursor: help;
  vertical-align: baseline;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- Add card ---------- */
.add-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  box-shadow: var(--shadow-sm);
  margin-bottom: 20px;
}

.add-form {
  display: grid;
  gap: 8px;
  grid-template-columns: 1fr;
  grid-template-areas:
    "url"
    "title"
    "tags"
    "save";
}

.field-url   { grid-area: url; }
.field-save  { grid-area: save; width: 100%; }
.field-title { grid-area: title; }
.field-tags  { grid-area: tags; }

.add-card input[type="url"],
.add-card input[type="text"] {
  min-width: 0;
  width: 100%;
}

input[type="url"],
input[type="text"],
input[type="search"] {
  width: 100%;
  padding: 10px 12px;
  font-size: 14px;
  font-family: inherit;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  transition: border-color 120ms ease, box-shadow 120ms ease;
}

input[type="url"]:focus,
input[type="text"]:focus,
input[type="search"]:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

button {
  font-family: inherit;
  font-size: 14px;
  cursor: pointer;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  padding: 10px 16px;
  transition: background-color 120ms ease, border-color 120ms ease,
    color 120ms ease;
}

button.primary {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  font-weight: 500;
}

button.primary:hover {
  background: #1d4ed8;
  border-color: #1d4ed8;
}

button.ghost {
  background: var(--surface);
  color: var(--text-muted);
  border-color: var(--border-strong);
}

button.ghost:hover {
  color: var(--text);
  border-color: var(--text-faint);
}

/* ---------- Toolbar ---------- */
.toolbar {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 20px;
}

.toolbar-main {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.search-wrap {
  flex: 1 1 220px;
  min-width: 200px;
}

.tag-filters {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.tag-filters:empty {
  display: none;
}

.tools {
  display: flex;
  gap: 6px;
  flex-shrink: 0;
}

.tools button.ghost {
  padding: 8px 12px;
  font-size: 13px;
}

.tag-chip {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  font-size: 12px;
  border-radius: 999px;
  background: var(--tag-bg);
  color: var(--tag-text);
  border: 1px solid transparent;
  cursor: pointer;
  user-select: none;
  transition: background-color 120ms ease, border-color 120ms ease;
}

.tag-chip:hover {
  border-color: var(--border-strong);
}

.tag-chip.active {
  background: var(--tag-bg-active);
  color: #1d4ed8;
  border-color: #b9cff6;
}

/* ---------- Bookmarks list ---------- */
.bookmarks {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.year-group {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.year-group > summary {
  list-style: none;
  cursor: pointer;
  padding: 14px 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-weight: 600;
  color: var(--text);
  background: var(--surface);
}

.year-group > summary::-webkit-details-marker {
  display: none;
}

.year-group > summary::before {
  content: "";
  display: inline-block;
  width: 22px;
  height: 22px;
  margin-right: 10px;
  flex-shrink: 0;
  background-color: var(--text-muted);
  -webkit-mask: center / 14px 14px no-repeat
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'><polyline points='9 6 15 12 9 18'/></svg>");
  mask: center / 14px 14px no-repeat
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'><polyline points='9 6 15 12 9 18'/></svg>");
  transition: transform 150ms ease, background-color 120ms ease;
}

.year-group > summary:hover::before {
  background-color: var(--text);
}

.year-group[open] > summary::before {
  transform: rotate(90deg);
}

.year-label {
  font-size: 16px;
}

.year-count {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--surface-muted);
  padding: 2px 8px;
  border-radius: 999px;
}

.month-group {
  border-top: 1px solid var(--border);
}

.month-group > summary {
  list-style: none;
  cursor: pointer;
  padding: 10px 18px 10px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--surface-muted);
}

.month-group > summary::-webkit-details-marker {
  display: none;
}

.month-group > summary::before {
  content: "";
  display: inline-block;
  width: 18px;
  height: 18px;
  margin-right: 8px;
  flex-shrink: 0;
  background-color: var(--text-muted);
  -webkit-mask: center / 12px 12px no-repeat
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'><polyline points='9 6 15 12 9 18'/></svg>");
  mask: center / 12px 12px no-repeat
    url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='black' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'><polyline points='9 6 15 12 9 18'/></svg>");
  transition: transform 150ms ease, background-color 120ms ease;
}

.month-group > summary:hover::before {
  background-color: var(--text);
}

.month-group[open] > summary::before {
  transform: rotate(90deg);
}

.bookmark-list {
  list-style: none;
  margin: 0;
  padding: 4px 0;
}

.bookmark {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 18px 10px 40px;
  border-top: 1px solid var(--border);
}

.bookmark:first-child {
  border-top: none;
}

.month-group .bookmark {
  padding-left: 56px;
}

.bookmark-main {
  flex: 1;
  min-width: 0;
}

.bookmark-title {
  display: block;
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  font-size: 14px;
  line-height: 1.4;
  word-break: break-word;
}

.bookmark-title:hover {
  color: var(--accent);
  text-decoration: underline;
}

.bookmark-url {
  display: block;
  margin-top: 2px;
  color: var(--text-faint);
  font-size: 12px;
  word-break: break-all;
}

.bookmark-meta {
  margin-top: 6px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.bookmark-date {
  font-size: 11px;
  color: var(--text-faint);
}

.bookmark-tag {
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 999px;
  background: var(--tag-bg);
  color: var(--tag-text);
  cursor: pointer;
  user-select: none;
  border: 1px solid transparent;
}

.bookmark-tag:hover {
  border-color: var(--border-strong);
}

.bookmark-actions {
  display: flex;
  gap: 4px;
  flex-shrink: 0;
}

.icon-btn {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-faint);
  padding: 6px;
  font-size: 12px;
  border-radius: var(--radius-sm);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 0;
}

.icon-btn svg {
  display: block;
  width: 16px;
  height: 16px;
}

.icon-btn:hover {
  color: var(--accent);
  background: var(--accent-soft);
  border-color: transparent;
}

.icon-btn.icon-btn-danger:hover {
  color: var(--danger);
  background: var(--danger-soft);
}

.icon-btn:focus-visible {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

/* ---------- Modal ---------- */
dialog.modal {
  border: none;
  padding: 0;
  background: transparent;
  color: inherit;
  max-width: min(480px, calc(100% - 32px));
  width: 100%;
  margin: auto;
}

dialog.modal::backdrop {
  background: rgba(15, 23, 42, 0.35);
  backdrop-filter: blur(2px);
}

.modal-form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px 16px;
  box-shadow: 0 12px 32px rgba(15, 23, 42, 0.12);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 2px;
}

.modal-title {
  margin: 0;
  font-size: 18px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.01em;
}

.modal-close {
  font-size: 22px;
  line-height: 1;
  color: var(--text-muted);
  padding: 2px 8px;
}

.modal-field {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.modal-label {
  font-size: 12px;
  color: var(--text-muted);
  font-weight: 500;
}

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 8px;
  margin-top: 4px;
}

.empty {
  padding: 32px 20px;
  text-align: center;
  color: var(--text-muted);
  background: var(--surface);
  border: 1px dashed var(--border-strong);
  border-radius: var(--radius);
}

@media (max-width: 560px) {
  .site-header {
    padding-top: 24px;
  }

  .bookmark {
    padding-left: 18px;
  }

  .month-group .bookmark {
    padding-left: 30px;
  }
}