:root,
html[data-theme="light"] {
  color-scheme: light;
  --ink: #16343a;
  --ink-soft: #3d6369;
  --paper: #f3f7f5;
  --panel: rgba(255, 255, 255, 0.72);
  --surface: rgba(255, 255, 255, 0.92);
  --surface-soft: rgba(255, 255, 255, 0.7);
  --surface-strong: #fff;
  --input-bg: #f8fbfa;
  --line: rgba(22, 52, 58, 0.12);
  --accent: #1f7a6c;
  --accent-deep: #14574d;
  --danger: #b42318;
  --placeholder: #7a9196;
  --credit: rgba(61, 99, 105, 0.55);
  --hover-tint: rgba(22, 52, 58, 0.08);
  --accent-tint: rgba(31, 122, 108, 0.1);
  --shadow: 0 18px 50px rgba(16, 48, 52, 0.12);
  --menu-shadow: 0 12px 32px rgba(16, 48, 52, 0.16);
  --radius: 22px;
  --atmosphere:
    radial-gradient(ellipse 80% 55% at 12% -10%, rgba(95, 186, 168, 0.45), transparent 55%),
    radial-gradient(ellipse 70% 50% at 90% 0%, rgba(236, 196, 120, 0.35), transparent 50%),
    radial-gradient(ellipse 60% 45% at 50% 100%, rgba(92, 140, 168, 0.22), transparent 55%),
    linear-gradient(165deg, #eef6f3 0%, #f7f3ea 48%, #e8f0f4 100%);
  --font-display: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --font-body: "Avenir Next", Avenir, "Segoe UI", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", sans-serif;
  /* 跨平台系统 UI 字体：Mac → SF，Windows → Segoe UI，Linux → 发行版默认无衬线 */
  --font-clock: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue",
    Arial, sans-serif;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --ink: #e6eef0;
  --ink-soft: #9bb4b8;
  --paper: #10181a;
  --panel: rgba(24, 34, 36, 0.82);
  --surface: rgba(36, 48, 50, 0.92);
  --surface-soft: rgba(36, 48, 50, 0.72);
  --surface-strong: #243032;
  --input-bg: #1a2426;
  --line: rgba(230, 238, 240, 0.12);
  --accent: #3d9b8c;
  --accent-deep: #6fc4b4;
  --danger: #f07167;
  --placeholder: #7f979b;
  --credit: rgba(155, 180, 184, 0.55);
  --hover-tint: rgba(230, 238, 240, 0.08);
  --accent-tint: rgba(61, 155, 140, 0.16);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
  --menu-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
  --atmosphere:
    radial-gradient(ellipse 80% 55% at 12% -10%, rgba(45, 120, 110, 0.35), transparent 55%),
    radial-gradient(ellipse 70% 50% at 90% 0%, rgba(120, 90, 40, 0.22), transparent 50%),
    radial-gradient(ellipse 60% 45% at 50% 100%, rgba(40, 80, 110, 0.28), transparent 55%),
    linear-gradient(165deg, #121a1c 0%, #162022 48%, #10161a 100%);
}

@media (prefers-color-scheme: dark) {
  html[data-theme="auto"] {
    color-scheme: dark;
    --ink: #e6eef0;
    --ink-soft: #9bb4b8;
    --paper: #10181a;
    --panel: rgba(24, 34, 36, 0.82);
    --surface: rgba(36, 48, 50, 0.92);
    --surface-soft: rgba(36, 48, 50, 0.72);
    --surface-strong: #243032;
    --input-bg: #1a2426;
    --line: rgba(230, 238, 240, 0.12);
    --accent: #3d9b8c;
    --accent-deep: #6fc4b4;
    --danger: #f07167;
    --placeholder: #7f979b;
    --credit: rgba(155, 180, 184, 0.55);
    --hover-tint: rgba(230, 238, 240, 0.08);
    --accent-tint: rgba(61, 155, 140, 0.16);
    --shadow: 0 18px 50px rgba(0, 0, 0, 0.35);
    --menu-shadow: 0 12px 32px rgba(0, 0, 0, 0.4);
    --atmosphere:
      radial-gradient(ellipse 80% 55% at 12% -10%, rgba(45, 120, 110, 0.35), transparent 55%),
      radial-gradient(ellipse 70% 50% at 90% 0%, rgba(120, 90, 40, 0.22), transparent 50%),
      radial-gradient(ellipse 60% 45% at 50% 100%, rgba(40, 80, 110, 0.28), transparent 55%),
      linear-gradient(165deg, #121a1c 0%, #162022 48%, #10161a 100%);
  }
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  color: var(--ink);
  font-family: var(--font-body);
  background: var(--paper);
  overflow-x: hidden;
}

.atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: var(--atmosphere);
  animation: drift 18s ease-in-out infinite alternate;
}

@keyframes drift {
  from {
    transform: scale(1) translateY(0);
  }
  to {
    transform: scale(1.04) translateY(-1.5%);
  }
}

.shell {
  width: min(1080px, calc(100% - 48px));
  margin: 0 auto;
  padding: 36px 0 72px;
}

.hero {
  position: relative;
  z-index: 5;
  text-align: center;
  margin-bottom: 40px;
  animation: rise 0.7s ease both;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.clock {
  margin: 0;
  font-family: var(--font-clock);
  font-weight: 300;
  font-size: clamp(3.4rem, 8vw, 5.6rem);
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  line-height: 1;
}

.search {
  width: min(584px, 100%);
  margin: 28px auto 0;
}

.search-wrap {
  position: relative;
}

.bookmark-btn {
  position: absolute;
  z-index: 2;
  left: 8px;
  top: 50%;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  transform: translateY(-50%);
  transition: background 0.15s ease, color 0.15s ease;
}

.bookmark-btn:hover,
.bookmark-btn[aria-expanded="true"] {
  background: var(--accent-tint);
  color: var(--accent-deep);
}

.search-submit {
  position: absolute;
  z-index: 2;
  right: 8px;
  top: 50%;
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  margin: 0;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--ink-soft);
  cursor: pointer;
  transform: translateY(-50%);
  transition: background 0.15s ease, color 0.15s ease;
}

.search-submit:hover {
  background: var(--accent-tint);
  color: var(--accent-deep);
}

.search #search-input {
  width: 100%;
  height: 52px;
  padding: 0 52px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--surface);
  box-shadow: var(--shadow);
  color: var(--ink);
  font: inherit;
  font-size: 1rem;
  outline: none;
  transition: box-shadow 0.18s ease, border-color 0.18s ease;
}

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

.search #search-input:hover {
  box-shadow: 0 2px 10px rgba(22, 52, 58, 0.12);
}

.search #search-input:focus {
  border-color: rgba(31, 122, 108, 0.35);
  box-shadow: 0 0 0 3px rgba(31, 122, 108, 0.12), 0 2px 10px rgba(22, 52, 58, 0.1);
}

.search-suggest {
  position: absolute;
  z-index: 30;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  margin: 0;
  padding: 8px;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface-strong);
  box-shadow: var(--menu-shadow);
  max-height: min(320px, 50vh);
  overflow: auto;
}

.search-suggest-item {
  display: flex;
  align-items: center;
  gap: 4px;
  border-radius: 12px;
}

.search-suggest-item[aria-selected="true"],
.search-suggest-item:hover {
  background: var(--hover-tint);
}

.search-suggest-pick {
  flex: 1;
  min-width: 0;
  margin: 0;
  padding: 10px 12px;
  border: 0;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 0.95rem;
  text-align: left;
  cursor: pointer;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.search-suggest-remove {
  flex: none;
  width: 32px;
  height: 32px;
  margin-right: 4px;
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--ink-soft);
  font: inherit;
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  opacity: 0.55;
}

.search-suggest-remove:hover {
  background: var(--accent-tint);
  color: var(--accent-deep);
  opacity: 1;
}

.search-wrap[data-mode="bookmark"] .search-submit {
  color: var(--accent-deep);
}

.bookmark-panel {
  position: absolute;
  z-index: 31;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  max-height: min(420px, 58vh);
  margin: 0;
  padding: 8px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--surface-strong);
  box-shadow: var(--menu-shadow);
  text-align: left;
  overflow: auto;
}

.bookmark-tree {
  margin: 0;
}

.bookmark-tree ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.bookmark-tree ul ul {
  margin-left: 14px;
  padding-left: 10px;
  border-left: 1px solid var(--line);
}

.bookmark-empty {
  margin: 0;
  padding: 16px 12px 20px;
  color: var(--ink-soft);
  font-size: 0.92rem;
  text-align: center;
}

.bookmark-row {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  min-height: 36px;
  margin: 0;
  padding: 6px 10px;
  border: 0;
  border-radius: 12px;
  background: transparent;
  color: var(--ink);
  font: inherit;
  font-size: 0.92rem;
  text-align: left;
  cursor: pointer;
  overflow: hidden;
}

.bookmark-row:hover {
  background: var(--hover-tint);
}

.bookmark-folder > .bookmark-row {
  font-weight: 600;
}

.bookmark-chevron {
  flex: none;
  width: 12px;
  color: var(--ink-soft);
  font-size: 0.7rem;
  line-height: 1;
  transition: transform 0.15s ease;
}

.bookmark-folder[data-open="true"] > .bookmark-row .bookmark-chevron {
  transform: rotate(90deg);
}

.bookmark-icon {
  flex: none;
  width: 16px;
  height: 16px;
  border-radius: 3px;
  object-fit: contain;
}

.bookmark-folder-icon {
  flex: none;
  display: grid;
  place-items: center;
  width: 16px;
  height: 16px;
  color: var(--accent);
}

.bookmark-title {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.bookmark-url {
  flex: none;
  max-width: 42%;
  color: var(--ink-soft);
  font-size: 0.78rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.bookmark-children {
  display: none;
  padding: 2px 0 4px;
}

.bookmark-folder[data-open="true"] > .bookmark-children {
  display: block;
}

.board {
  position: relative;
  z-index: 1;
  background: var(--panel);
  backdrop-filter: blur(16px);
  border: 1px solid var(--line);
  border-radius: calc(var(--radius) + 8px);
  box-shadow: var(--shadow);
  padding: 22px 22px 28px;
  animation: rise 0.8s ease 0.08s both;
}

.primary-btn,
.ghost-btn,
.icon-btn {
  font: inherit;
  cursor: pointer;
  border-radius: 999px;
  transition: transform 0.15s ease, background 0.15s ease, color 0.15s ease,
    border-color 0.15s ease;
}

.primary-btn:hover,
.ghost-btn:hover,
.icon-btn:hover {
  transform: translateY(-1px);
}

.primary-btn {
  border: none;
  background: var(--accent);
  color: #fff;
  padding: 0.55rem 1.1rem;
  font-weight: 600;
}

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

.ghost-btn {
  border: 1px solid var(--line);
  background: var(--surface-soft);
  color: var(--ink);
  padding: 0.55rem 1rem;
}

.ghost-btn[aria-pressed="true"] {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}

.grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(148px, 1fr));
  gap: 14px;
}

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  padding: 18px 12px 14px;
  text-decoration: none;
  color: inherit;
  border-radius: var(--radius);
  border: 1px solid transparent;
  background: transparent;
  user-select: none;
  -webkit-user-select: none;
  touch-action: manipulation;
  cursor: pointer;
  transition: background 0.18s ease, border-color 0.18s ease, transform 0.18s ease,
    box-shadow 0.18s ease;
}

.card:hover {
  background: var(--surface-soft);
  border-color: var(--line);
}

.card.long-press-ready,
.card.dragging {
  cursor: grabbing;
  opacity: 0.72;
  transform: scale(1.04);
  background: var(--surface);
  border-color: var(--accent);
  box-shadow: var(--menu-shadow);
  z-index: 2;
}

.card.drag-over {
  border-color: var(--accent);
  background: var(--accent-tint);
}

.card-icon {
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: var(--surface-strong);
  border: 1px solid var(--line);
  display: grid;
  place-items: center;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.card-icon img {
  width: 32px;
  height: 32px;
  object-fit: contain;
}

.card-title {
  width: 100%;
  margin: 0;
  text-align: center;
  font-size: 0.92rem;
  line-height: 1.3;
  overflow: hidden;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  word-break: break-word;
}

.card-edit {
  position: absolute;
  top: 6px;
  right: 6px;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
  color: var(--ink-soft);
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: scale(0.92);
  transition: opacity 0.15s ease, transform 0.15s ease, color 0.15s ease,
    background 0.15s ease;
}

.card:hover .card-edit,
.card:focus-within .card-edit {
  opacity: 1;
  pointer-events: auto;
  transform: scale(1);
}

.card-edit:hover {
  color: var(--accent-deep);
  background: var(--surface-strong);
  border-color: rgba(31, 122, 108, 0.35);
}

.card-add .add-icon {
  font-size: 1.6rem;
  font-weight: 300;
  color: var(--ink-soft);
  background: var(--surface-soft);
}

.hint {
  margin: 28px 8px 8px;
  text-align: center;
  color: var(--ink-soft);
  line-height: 1.6;
}

.modal {
  border: none;
  border-radius: 24px;
  padding: 0;
  width: min(420px, calc(100vw - 32px));
  box-shadow: var(--shadow);
  background: var(--surface-strong);
  color: var(--ink);
}

.modal::backdrop {
  background: rgba(18, 40, 44, 0.38);
  backdrop-filter: blur(4px);
}

.modal form {
  display: grid;
  gap: 14px;
  padding: 24px;
}

.modal h3 {
  margin: 0 0 4px;
  font-family: var(--font-display);
  font-size: 1.35rem;
}

.modal label {
  display: grid;
  gap: 6px;
  font-size: 0.9rem;
  color: var(--ink-soft);
}

.modal input {
  font: inherit;
  color: var(--ink);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.7rem 0.85rem;
  background: var(--input-bg);
}

.modal input:focus {
  outline: 2px solid rgba(31, 122, 108, 0.35);
  border-color: var(--accent);
}

.dialog-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: 6px;
}

.dialog-actions-right {
  display: flex;
  gap: 10px;
  margin-left: auto;
}

.text-danger {
  font: inherit;
  border: none;
  background: transparent;
  color: var(--danger);
  cursor: pointer;
  padding: 0.55rem 0.4rem;
  border-radius: 8px;
}

.text-danger:hover {
  background: rgba(180, 35, 24, 0.08);
}

.form-error {
  margin: 0;
  color: var(--danger);
  font-size: 0.88rem;
}

.credit {
  margin: 14px 0 0;
  text-align: center;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--credit);
  user-select: none;
}

@media (max-width: 640px) {
  .shell {
    width: min(100% - 24px, 1080px);
    padding-top: 28px;
  }

}