:root {
  --radius: 14px;
  --app-bg: #e8e8ea;
  --window-bg: #ffffff;
  --sidebar-bg: #f4f4f5;
  --content-bg: #ffffff;
  --toc-bg: #fafafb;
  --bg: #ffffff;
  --bg-accent: #f1f1f3;
  --panel: #ffffff;
  --panel-border: rgba(0, 0, 0, 0.10);
  --separator: rgba(0, 0, 0, 0.08);
  --surface-2: #ffffff;
  --surface-3: #f1f1f3;
  --hover: rgba(0, 0, 0, 0.05);
  --hover-strong: rgba(0, 0, 0, 0.08);
  --field-bg: rgba(0, 0, 0, 0.05);
  --inline-code-bg: rgba(0, 0, 0, 0.06);
  --inline-code-text: #b14a3a;
  --text: #1d1d1f;
  --muted: #86868b;
  --faint: #aeaeb2;
  --accent: #f5b800;
  --accent-soft: rgba(245, 184, 0, 0.16);
  --accent-strong: #9a7400;
  --selection: rgba(245, 184, 0, 0.26);
  --ring: rgba(10, 122, 255, 0.45);
  --danger: #d6392b;
  --danger-soft: rgba(214, 57, 43, 0.10);
  --code-bg: #1e1e20;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.16), 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
  --folder: #ffc928;
  --file: #b6b6bb;
  --link: #0a7aff;
  --input-bg: rgba(0, 0, 0, 0.05);
  --toc-hover: rgba(0, 0, 0, 0.05);
  --scroll-thumb: rgba(0, 0, 0, 0.18);
  --scroll-thumb-hover: rgba(0, 0, 0, 0.30);
  --code-text: #f0f0ed;
  --code-comment: #8b8b89;
  --code-keyword: #d2b7ff;
  --code-control: #9fc0ff;
  --code-string: #a9c88f;
  --code-number: #d7b37d;
  --code-function: #9fc0ff;
  --code-type: #dfc38f;
  --code-annotation: #8fc8c1;
  --code-builtin: #8fc8c1;
  --code-operator: #bcbcb7;
  --code-variable: #ececea;
  --code-error: #e39b90;
}

:root[data-theme="light"] {
  --app-bg: #e8e8ea;
  --window-bg: #ffffff;
  --sidebar-bg: #f4f4f5;
  --content-bg: #ffffff;
  --toc-bg: #fafafb;
  --bg: #ffffff;
  --bg-accent: #f1f1f3;
  --panel: #ffffff;
  --panel-border: rgba(0, 0, 0, 0.10);
  --separator: rgba(0, 0, 0, 0.08);
  --surface-2: #ffffff;
  --surface-3: #f1f1f3;
  --hover: rgba(0, 0, 0, 0.05);
  --hover-strong: rgba(0, 0, 0, 0.08);
  --field-bg: rgba(0, 0, 0, 0.05);
  --inline-code-bg: rgba(0, 0, 0, 0.06);
  --inline-code-text: #b14a3a;
  --text: #1d1d1f;
  --muted: #86868b;
  --faint: #aeaeb2;
  --accent: #f5b800;
  --accent-soft: rgba(245, 184, 0, 0.16);
  --accent-strong: #9a7400;
  --selection: rgba(245, 184, 0, 0.26);
  --ring: rgba(10, 122, 255, 0.45);
  --danger: #d6392b;
  --danger-soft: rgba(214, 57, 43, 0.10);
  --code-bg: #1e1e20;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.16), 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
  --folder: #ffc928;
  --file: #b6b6bb;
  --link: #0a7aff;
  --input-bg: rgba(0, 0, 0, 0.05);
  --toc-hover: rgba(0, 0, 0, 0.05);
  --scroll-thumb: rgba(0, 0, 0, 0.18);
  --scroll-thumb-hover: rgba(0, 0, 0, 0.30);
  --code-text: #f0f0ed;
  --code-comment: #8b8b89;
  --code-keyword: #d2b7ff;
  --code-control: #9fc0ff;
  --code-string: #a9c88f;
  --code-number: #d7b37d;
  --code-function: #9fc0ff;
  --code-type: #dfc38f;
  --code-annotation: #8fc8c1;
  --code-builtin: #8fc8c1;
  --code-operator: #bcbcb7;
  --code-variable: #ececea;
  --code-error: #e39b90;
}

:root[data-theme="dark"] {
  --app-bg: #000000;
  --window-bg: #1c1c1e;
  --sidebar-bg: #232325;
  --content-bg: #1c1c1e;
  --toc-bg: #202022;
  --bg: #1c1c1e;
  --bg-accent: rgba(255, 255, 255, 0.05);
  --panel: #1c1c1e;
  --panel-border: rgba(255, 255, 255, 0.10);
  --separator: rgba(255, 255, 255, 0.08);
  --surface-2: rgba(255, 255, 255, 0.06);
  --surface-3: rgba(255, 255, 255, 0.05);
  --hover: rgba(255, 255, 255, 0.06);
  --hover-strong: rgba(255, 255, 255, 0.10);
  --field-bg: rgba(255, 255, 255, 0.08);
  --inline-code-bg: rgba(255, 255, 255, 0.08);
  --inline-code-text: #ff9b9b;
  --text: #f5f5f7;
  --muted: #98989d;
  --faint: #6e6e73;
  --accent: #ffd60a;
  --accent-soft: rgba(255, 214, 10, 0.16);
  --accent-strong: #ffd60a;
  --selection: rgba(255, 214, 10, 0.22);
  --ring: rgba(10, 132, 255, 0.6);
  --danger: #ff5a4d;
  --danger-soft: rgba(255, 90, 77, 0.16);
  --code-bg: #2b2b2e;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.55), 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --folder: #ffd60a;
  --file: #8e8e93;
  --link: #0a84ff;
  --input-bg: rgba(255, 255, 255, 0.08);
  --toc-hover: rgba(255, 255, 255, 0.06);
  --scroll-thumb: rgba(255, 255, 255, 0.16);
  --scroll-thumb-hover: rgba(255, 255, 255, 0.28);
  --code-text: #f0f0ed;
  --code-comment: #8b8b89;
  --code-keyword: #d2b7ff;
  --code-control: #9fc0ff;
  --code-string: #a9c88f;
  --code-number: #d7b37d;
  --code-function: #9fc0ff;
  --code-type: #dfc38f;
  --code-annotation: #8fc8c1;
  --code-builtin: #8fc8c1;
  --code-operator: #bcbcb7;
  --code-variable: #ececea;
  --code-error: #e39b90;
}

:root[data-theme="sepia"] {
  --app-bg: #ddd1ba;
  --window-bg: #f7eedb;
  --sidebar-bg: #efe4cb;
  --content-bg: #f8f0de;
  --toc-bg: #f2e7cf;
  --bg: #f7eedb;
  --bg-accent: #efe2c7;
  --panel: #f7eedb;
  --panel-border: rgba(96, 72, 36, 0.20);
  --separator: rgba(96, 72, 36, 0.15);
  --surface-2: #fcf4e2;
  --surface-3: #efe2c7;
  --hover: rgba(120, 90, 40, 0.08);
  --hover-strong: rgba(120, 90, 40, 0.13);
  --field-bg: rgba(120, 90, 40, 0.09);
  --inline-code-bg: rgba(120, 90, 40, 0.12);
  --inline-code-text: #9a4f24;
  --text: #4b3a26;
  --muted: #8a7757;
  --faint: #b3a07c;
  --accent: #bb7a2c;
  --accent-soft: rgba(187, 122, 44, 0.16);
  --accent-strong: #8a521b;
  --selection: rgba(187, 122, 44, 0.24);
  --ring: rgba(10, 122, 255, 0.45);
  --danger: #d6392b;
  --danger-soft: rgba(214, 57, 43, 0.10);
  --code-bg: #2c2620;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.16), 0 2px 8px rgba(0, 0, 0, 0.06);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.06);
  --folder: #c4892f;
  --file: #aa9871;
  --link: #9a5a20;
  --input-bg: rgba(120, 90, 40, 0.09);
  --toc-hover: rgba(120, 90, 40, 0.08);
  --scroll-thumb: rgba(96, 72, 36, 0.24);
  --scroll-thumb-hover: rgba(96, 72, 36, 0.36);
  --code-text: #f0f0ed;
  --code-comment: #8b8b89;
  --code-keyword: #d2b7ff;
  --code-control: #9fc0ff;
  --code-string: #a9c88f;
  --code-number: #d7b37d;
  --code-function: #9fc0ff;
  --code-type: #dfc38f;
  --code-annotation: #8fc8c1;
  --code-builtin: #8fc8c1;
  --code-operator: #bcbcb7;
  --code-variable: #ececea;
  --code-error: #e39b90;
}

:root[data-theme="monokai"] {
  --app-bg: #171814;
  --window-bg: #272822;
  --sidebar-bg: #1f201b;
  --content-bg: #272822;
  --toc-bg: #23241f;
  --bg: #272822;
  --bg-accent: #23241f;
  --panel: #272822;
  --panel-border: #46473e;
  --separator: #3b3c34;
  --surface-2: #2f3029;
  --surface-3: #23241f;
  --hover: rgba(166, 226, 46, 0.07);
  --hover-strong: rgba(166, 226, 46, 0.12);
  --field-bg: #2f3029;
  --inline-code-bg: #3a3b33;
  --inline-code-text: #f92672;
  --text: #f8f8f2;
  --muted: #a6a69c;
  --faint: #75715e;
  --accent: #a6e22e;
  --accent-soft: rgba(166, 226, 46, 0.14);
  --accent-strong: #a6e22e;
  --selection: rgba(73, 72, 62, 0.92);
  --ring: rgba(166, 226, 46, 0.50);
  --danger: #ff5a4d;
  --danger-soft: rgba(255, 90, 77, 0.16);
  --code-bg: #1e1f1c;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.55), 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --folder: #e6db74;
  --file: #75715e;
  --link: #66d9ef;
  --input-bg: #2f3029;
  --toc-hover: rgba(166, 226, 46, 0.07);
  --scroll-thumb: rgba(248, 248, 242, 0.16);
  --scroll-thumb-hover: rgba(248, 248, 242, 0.28);
  --code-text: #f0f0ed;
  --code-comment: #8b8b89;
  --code-keyword: #d2b7ff;
  --code-control: #9fc0ff;
  --code-string: #a9c88f;
  --code-number: #d7b37d;
  --code-function: #9fc0ff;
  --code-type: #dfc38f;
  --code-annotation: #8fc8c1;
  --code-builtin: #8fc8c1;
  --code-operator: #bcbcb7;
  --code-variable: #ececea;
  --code-error: #e39b90;
}

:root[data-theme="one-dark"] {
  --app-bg: #17191f;
  --window-bg: #282c34;
  --sidebar-bg: #21252b;
  --content-bg: #282c34;
  --toc-bg: #252930;
  --bg: #282c34;
  --bg-accent: #252931;
  --panel: #282c34;
  --panel-border: #3a3f4b;
  --separator: #343943;
  --surface-2: #2c313a;
  --surface-3: #252931;
  --hover: rgba(171, 178, 191, 0.07);
  --hover-strong: rgba(171, 178, 191, 0.12);
  --field-bg: #2c313a;
  --inline-code-bg: #333842;
  --inline-code-text: #e06c75;
  --text: #abb2bf;
  --muted: #7f848e;
  --faint: #5c6370;
  --accent: #61afef;
  --accent-soft: rgba(97, 175, 239, 0.16);
  --accent-strong: #61afef;
  --selection: rgba(97, 175, 239, 0.20);
  --ring: rgba(97, 175, 239, 0.52);
  --danger: #ff5a4d;
  --danger-soft: rgba(255, 90, 77, 0.16);
  --code-bg: #1e222a;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.55), 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --folder: #e5c07b;
  --file: #7f848e;
  --link: #61afef;
  --input-bg: #2c313a;
  --toc-hover: rgba(171, 178, 191, 0.07);
  --scroll-thumb: rgba(255, 255, 255, 0.16);
  --scroll-thumb-hover: rgba(255, 255, 255, 0.28);
  --code-text: #f0f0ed;
  --code-comment: #8b8b89;
  --code-keyword: #d2b7ff;
  --code-control: #9fc0ff;
  --code-string: #a9c88f;
  --code-number: #d7b37d;
  --code-function: #9fc0ff;
  --code-type: #dfc38f;
  --code-annotation: #8fc8c1;
  --code-builtin: #8fc8c1;
  --code-operator: #bcbcb7;
  --code-variable: #ececea;
  --code-error: #e39b90;
}

:root[data-theme="tokyo-night"] {
  --app-bg: #111218;
  --window-bg: #1a1b26;
  --sidebar-bg: #16161e;
  --content-bg: #1a1b26;
  --toc-bg: #181924;
  --bg: #1a1b26;
  --bg-accent: #1f2335;
  --panel: #1a1b26;
  --panel-border: #292e42;
  --separator: #24283b;
  --surface-2: #24283b;
  --surface-3: #1f2335;
  --hover: rgba(122, 162, 247, 0.08);
  --hover-strong: rgba(122, 162, 247, 0.14);
  --field-bg: #24283b;
  --inline-code-bg: #24283b;
  --inline-code-text: #f7768e;
  --text: #c0caf5;
  --muted: #9aa5ce;
  --faint: #565f89;
  --accent: #7aa2f7;
  --accent-soft: rgba(122, 162, 247, 0.16);
  --accent-strong: #7dcfff;
  --selection: rgba(51, 70, 124, 0.72);
  --ring: rgba(122, 162, 247, 0.52);
  --danger: #ff5a4d;
  --danger-soft: rgba(255, 90, 77, 0.16);
  --code-bg: #16161e;
  --shadow: 0 24px 60px rgba(0, 0, 0, 0.55), 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --folder: #e0af68;
  --file: #565f89;
  --link: #7dcfff;
  --input-bg: #24283b;
  --toc-hover: rgba(122, 162, 247, 0.08);
  --scroll-thumb: rgba(192, 202, 245, 0.16);
  --scroll-thumb-hover: rgba(192, 202, 245, 0.28);
  --code-text: #f0f0ed;
  --code-comment: #8b8b89;
  --code-keyword: #d2b7ff;
  --code-control: #9fc0ff;
  --code-string: #a9c88f;
  --code-number: #d7b37d;
  --code-function: #9fc0ff;
  --code-type: #dfc38f;
  --code-annotation: #8fc8c1;
  --code-builtin: #8fc8c1;
  --code-operator: #bcbcb7;
  --code-variable: #ececea;
  --code-error: #e39b90;
}

* {
  box-sizing: border-box;
}

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

body {
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
  background: var(--app-bg);
}

body.lightbox-open {
  overflow: hidden;
}

a {
  color: inherit;
}

button,
input {
  font: inherit;
}

.layout {
  width: min(1500px, calc(100vw - 2rem));
  height: calc(100vh - 2rem);
  margin: 1rem auto;
  display: grid;
  grid-template-columns: minmax(268px, 328px) minmax(0, 1fr);
  gap: 0;
  align-items: stretch;
  background: var(--window-bg);
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  box-shadow: var(--shadow);
  overflow: hidden;
}

.layout.has-toc {
  grid-template-columns: minmax(268px, 328px) minmax(0, 1fr) minmax(218px, 258px);
}

.layout.cards-layout {
  width: min(1500px, calc(100vw - 2rem));
}

.layout.folder-open-layout {
  width: min(1500px, calc(100vw - 2rem));
}

.panel {
  background: var(--panel);
  border: 1px solid var(--panel-border);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
}

.layout > .panel {
  border: 0;
  border-radius: 0;
  box-shadow: none;
}

.toc-panel-empty {
  visibility: hidden;
  pointer-events: none;
  background: transparent;
  border-color: transparent;
  box-shadow: none;
}

.sidebar {
  padding: 0.85rem 0.72rem 1.08rem;
  height: 100%;
  overflow: auto;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--separator);
}

.sidebar-top {
  display: flex;
  align-items: flex-start;
  justify-content: flex-start;
  gap: 0.75rem;
  padding: 0.42rem 0.56rem 0;
}

.sidebar-brand {
  display: grid;
  gap: 0.14rem;
}

.sidebar-brand h1 {
  margin: 0;
  font-size: 1.68rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-link {
  color: inherit;
  text-decoration: none;
}

.brand-link:hover {
  color: var(--text);
}

.sidebar-brand p {
  margin: 0.22rem 0 0;
  color: var(--muted);
  font-size: 0.81rem;
  line-height: 1.45;
  max-width: 15rem;
}

.floating-controls {
  position: fixed;
  top: 1.6rem;
  right: 1.6rem;
  z-index: 50;
  padding: 0.14rem;
  border-radius: 12px;
  box-shadow: var(--shadow-sm);
}

.edge-hover-zone {
  display: none;
}

.settings-shell {
  position: relative;
  isolation: isolate;
}

.control-button {
  width: 36px;
  height: 36px;
  border: 1px solid var(--panel-border);
  border-radius: 10px;
  background: var(--surface-2);
  display: grid;
  place-items: center;
  cursor: pointer;
  color: var(--text);
  transition: background 160ms ease, border-color 160ms ease, transform 160ms ease;
}

.control-button:hover,
.control-button[aria-expanded="true"] {
  background: var(--accent-soft);
}

.settings-toggle-icon {
  width: 16px;
  height: 16px;
  display: block;
}

.settings-toggle-icon svg {
  width: 100%;
  height: 100%;
  display: block;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.85;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.settings-menu {
  position: absolute;
  top: calc(100% + 0.6rem);
  right: 0;
  width: min(236px, calc(100vw - 2rem));
  padding: 0.42rem;
  display: grid;
  gap: 0.4rem;
  border-radius: 14px;
  box-shadow: var(--shadow);
  transform-origin: top right;
}

.settings-menu[hidden] {
  display: none;
}

.settings-group {
  display: grid;
  gap: 0.18rem;
}

.settings-group + .settings-group {
  padding-top: 0.32rem;
  border-top: 1px solid var(--panel-border);
}

.settings-label {
  padding: 0.08rem 0.38rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.settings-option {
  width: 100%;
  padding: 0.68rem 0.74rem;
  border: 1px solid transparent;
  border-radius: 14px;
  background: transparent;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.7rem;
  text-align: left;
  cursor: pointer;
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  transition: background 160ms ease, border-color 160ms ease;
}

.settings-option:hover,
.settings-option.is-active {
  background: var(--accent-soft);
}

.settings-option.is-active {
  border-color: var(--panel-border);
}

.settings-menu {
  max-height: calc(100vh - 4rem);
  overflow: auto;
}

.theme-choice {
  gap: 0.6rem;
}

.theme-choice.is-active .settings-option-title {
  font-weight: 700;
  color: var(--accent-strong);
}

.theme-swatch {
  position: relative;
  flex: 0 0 auto;
  width: 40px;
  height: 24px;
  border-radius: 7px;
  border: 1px solid var(--panel-border);
  background: var(--sw-window);
  overflow: hidden;
}

.theme-swatch::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 13px;
  background: var(--sw-sidebar);
  border-right: 1px solid var(--panel-border);
}

.theme-swatch::after {
  content: "";
  position: absolute;
  right: 5px;
  top: 50%;
  width: 9px;
  height: 9px;
  margin-top: -4.5px;
  border-radius: 999px;
  background: var(--sw-accent);
}

.settings-option-copy {
  display: grid;
  gap: 0.14rem;
}

.settings-option-title {
  font-size: 0.88rem;
  font-weight: 600;
}

.settings-option-state {
  font-size: 0.76rem;
  color: var(--muted);
}

.settings-option-badge {
  padding: 0.2rem 0.42rem;
  border-radius: 999px;
  background: var(--surface-3);
  font-size: 0.69rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  white-space: nowrap;
}

.search-shell {
  position: relative;
  margin: 1.08rem 0.56rem 0;
}

.search-shell input {
  width: 100%;
  padding: 0.56rem 0.76rem;
  border: 1px solid transparent;
  border-radius: 11px;
  background: var(--field-bg);
  color: var(--text);
  font-size: 0.88rem;
  outline: none;
}

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

.search-shell input:focus {
  border-color: var(--ring);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--ring) 35%, transparent);
}

.nav-pills {
  display: flex;
  gap: 0.4rem;
  margin: 0.82rem 0.56rem 0;
}

.nav-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex: 1 1 auto;
  padding: 0.4rem 0.72rem;
  border-radius: 8px;
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.82rem;
  font-weight: 500;
  transition: background 140ms ease, color 140ms ease;
}

.nav-pill:hover {
  color: var(--text);
  background: var(--hover);
}

.nav-pill.active {
  color: var(--accent-strong);
  background: var(--accent-soft);
  font-weight: 600;
}

.sidebar-actions {
  margin: 0.78rem 0.56rem 0;
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.action-button,
.action-link,
.action-danger {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.56rem 0.86rem;
  border-radius: 12px;
  border: 1px solid var(--panel-border);
  background: var(--surface-2);
  color: var(--text);
  text-decoration: none;
  cursor: pointer;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.82rem;
  line-height: 1;
}

.action-button:hover,
.action-link:hover {
  background: var(--accent-soft);
}

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

.action-danger:hover {
  background: color-mix(in srgb, var(--danger) 18%, transparent);
}

.action-button[hidden],
.action-link[hidden],
.action-danger[hidden] {
  display: none;
}

.sidebar-hint {
  display: block;
  color: var(--muted);
  font-size: 0.78rem;
  line-height: 1.5;
}

.source-label {
  color: var(--faint);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.tree-header {
  margin: 1rem 0.62rem 0;
  padding-top: 0.76rem;
  border-top: 1px solid var(--separator);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.55rem;
}

.tree-actions {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
}

.tree-action {
  width: 26px;
  height: 26px;
  padding: 0;
  border: 1px solid transparent;
  border-radius: 7px;
  background: transparent;
  color: var(--muted);
  display: inline-grid;
  place-items: center;
  cursor: pointer;
}

.tree-action:hover {
  border-color: var(--panel-border);
  background: var(--surface-2);
  color: var(--text);
}

.tree-action svg {
  width: 14px;
  height: 14px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.tree-action .tree-action-expand-icon {
  display: none;
}

.tree-action.is-expand .tree-action-collapse-icon {
  display: none;
}

.tree-action.is-expand .tree-action-expand-icon {
  display: block;
}

.tree-wrap {
  margin-top: 0.68rem;
}

.tree-section {
  margin-bottom: 0.9rem;
}

.tree-section-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0 0.3rem;
  padding: 0 0.6rem;
  color: var(--faint);
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.tree {
  display: block;
}

.tree-folder {
  display: block;
}

.tree-children {
  display: block;
}

.tree-row {
  width: 100%;
  min-height: 32px;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.38rem 0.6rem;
  border: 0;
  border-radius: 10px;
  background: transparent;
  color: inherit;
  text-decoration: none;
  text-align: left;
  cursor: pointer;
  user-select: none;
  transition: background 120ms ease;
}

.tree-folder-row {
  justify-content: flex-start;
}

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

.tree-row.active {
  background: var(--selection);
  box-shadow: inset 2px 0 0 var(--accent-strong);
}

.tree-row.active .tree-label,
.tree-row.active .tree-folder-label {
  font-weight: 600;
}

.tree-row:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 1px;
}

.tree-spacer {
  flex: 0 0 auto;
  height: 1px;
}

.tree-toggle {
  flex: 0 0 auto;
  width: 18px;
  height: 18px;
  display: grid;
  place-items: center;
  border: 0;
  border-radius: 8px;
  background: transparent;
  cursor: pointer;
  padding: 0;
}

.tree-toggle:hover {
  background: var(--hover-strong);
}

.tree-toggle:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 1px;
}

.tree-chevron {
  flex: 0 0 auto;
  width: 0;
  height: 0;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 5px solid var(--muted);
  transition: transform 120ms ease;
}

.tree-folder.open > .tree-row .tree-chevron {
  transform: rotate(90deg);
}

.tree-icon {
  flex: 0 0 auto;
}

.tree-icon.folder {
  position: relative;
  width: 13px;
  height: 10px;
  border-radius: 2px;
  background: var(--folder);
}

.tree-icon.folder::before {
  content: "";
  position: absolute;
  left: 1px;
  top: -3px;
  width: 6px;
  height: 4px;
  border-radius: 2px 2px 0 0;
  background: color-mix(in srgb, var(--folder) 85%, white);
}

.tree-icon.file {
  position: relative;
  width: 11px;
  height: 13px;
  border: 1px solid var(--file);
  border-radius: 2px;
}

.tree-icon.file::before {
  content: "";
  position: absolute;
  right: -1px;
  top: -1px;
  width: 5px;
  height: 5px;
  border-top: 1px solid var(--file);
  border-right: 1px solid var(--file);
  background: var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% 100%);
}

.tree-label {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: 0.88rem;
}

.tree-folder-label {
  min-width: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  flex: 1 1 auto;
}

.tree-empty {
  padding: 0.9rem 0.2rem 0;
  color: var(--muted);
  font-size: 0.84rem;
}

.content-panel {
  padding: clamp(1.28rem, 2.15vw, 2.3rem);
  height: 100%;
  overflow: auto;
  background: var(--content-bg);
}

.content-header {
  position: relative;
  isolation: isolate;
  margin-bottom: 1.25rem;
  padding: 0.16rem 0 1rem;
  border-bottom: 1px solid var(--separator);
  overflow: hidden;
}

.content-header::before,
.folder-hero::before {
  content: "";
  position: absolute;
  inset: -0.85rem 0 0;
  z-index: -1;
  pointer-events: none;
  opacity: 0.28;
  background-image: linear-gradient(to right, var(--separator) 1px, transparent 1px), linear-gradient(to bottom, var(--separator) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(to right, #000 0%, #000 44%, transparent 94%);
}

.content-panel > .content-header,
.content-panel > .note-body {
  width: min(100%, 70rem);
  margin-left: auto;
  margin-right: auto;
}

.content-header-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.9rem;
}

.content-header-tools {
  margin-left: auto;
  display: flex;
  align-items: flex-start;
  justify-content: flex-end;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  color: var(--accent-strong);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.content-header h1 {
  margin: 0.55rem 0 0;
  font-size: clamp(1.82rem, 3.05vw, 2.55rem);
  font-weight: 700;
  letter-spacing: -0.022em;
  line-height: 1.06;
}

.content-header p {
  margin: 0.5rem 0 0;
  color: var(--muted);
  max-width: 44rem;
  line-height: 1.6;
}

.content-header .note-description {
  font-style: italic;
  color: var(--muted);
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.9rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.back-link:visited,
.back-link:hover,
.back-link:active {
  text-decoration: none;
}

.back-link:hover {
  color: var(--accent-strong);
}

.page-nav-links {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
}

.header-actions {
  margin-top: 0.8rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.note-toolbar {
  margin-top: 0;
  display: inline-flex;
  gap: 0.45rem;
}

.icon-action,
.icon-action-danger {
  width: 38px;
  height: 38px;
  padding: 0;
  border: 1px solid var(--panel-border);
  border-radius: 12px;
  background: var(--surface-2);
  color: var(--text);
  display: inline-grid;
  place-items: center;
  text-decoration: none;
  cursor: pointer;
}

.icon-action:hover {
  background: var(--accent-soft);
}

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

.icon-action-danger:hover {
  background: color-mix(in srgb, var(--danger) 16%, transparent);
}

.icon-action-icon {
  width: 17px;
  height: 17px;
  display: block;
}

.icon-action-icon svg {
  width: 100%;
  height: 100%;
  stroke: currentColor;
  fill: none;
  stroke-width: 1.9;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.meta-row {
  margin-top: 1rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
}

.content-header-flags,
.note-link-flags,
.tag-note-flags,
.welcome-card-flags,
.card-note-flags {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.42rem;
}

.content-header-flags {
  justify-content: flex-end;
  align-self: flex-start;
  margin-left: 0;
}

.meta-pill,
.tag-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.38rem 0.66rem;
  border-radius: 999px;
  border: 1px solid var(--panel-border);
  background: var(--surface-2);
  color: var(--text);
  text-decoration: none;
  font-size: 0.83rem;
}

.tag-chip:hover {
  background: var(--accent-soft);
}

.flag-chip {
  display: inline-flex;
  align-items: center;
  padding: 0.32rem 0.56rem;
  border-radius: 999px;
  border: 1px solid var(--panel-border);
  background: var(--surface-3);
  color: var(--muted);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.72rem;
  font-style: normal;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  white-space: nowrap;
}

.flag-chip-todo {
  background: rgba(181, 116, 30, 0.12);
  color: #8c5316;
}

.flag-chip-revise {
  background: rgba(39, 101, 164, 0.12);
  color: #265b91;
}

:root[data-theme="dark"] .flag-chip {
  border-color: rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.06);
  color: #ededea;
}

:root[data-theme="dark"] .flag-chip-todo {
  border-color: rgba(239, 213, 162, 0.14);
  background: rgba(191, 151, 90, 0.18);
  color: #f3d7a2;
}

:root[data-theme="dark"] .flag-chip-revise {
  border-color: rgba(209, 225, 255, 0.14);
  background: rgba(100, 137, 188, 0.18);
  color: #d6e5ff;
}

.note-body {
  line-height: 1.7;
  font-size: 1rem;
}

.note-body > :first-child {
  margin-top: 0;
}

.note-body h1,
.note-body h2,
.note-body h3,
.note-body h4 {
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.012em;
}

.note-body h1 {
  margin-top: 1.5em;
  margin-bottom: 0.45em;
  font-size: 1.6rem;
}

.note-body h2 {
  margin-top: 1.55em;
  margin-bottom: 0.45em;
  font-size: 1.3rem;
  padding-bottom: 0.28em;
  border-bottom: 1px solid var(--separator);
}

.note-body h3 {
  margin-top: 1.3em;
  margin-bottom: 0.35em;
  font-size: 1.08rem;
}

.note-body h4 {
  margin-top: 1.2em;
  margin-bottom: 0.35em;
  font-size: 0.97rem;
}

.note-body p,
.note-body ul,
.note-body ol,
.note-body blockquote,
.note-body table {
  margin: 0.78rem 0;
}

.note-body ul,
.note-body ol {
  padding-left: 1.35rem;
}

.note-body li + li {
  margin-top: 0.3rem;
}

.note-body a {
  color: var(--link);
}

.note-body img {
  display: block;
  width: min(100%, 980px);
  height: auto;
  margin: 1.15rem auto;
  border-radius: 12px;
  border: 1px solid var(--separator);
  box-shadow: var(--shadow-sm);
  cursor: zoom-in;
}

.note-body img:hover {
  transform: translateY(-1px);
}

.image-lightbox {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: grid;
  place-items: center;
  padding: 2rem;
  background: rgba(12, 10, 8, 0.8);
  backdrop-filter: blur(10px);
}

.image-lightbox[hidden] {
  display: none;
}

.image-lightbox-inner {
  position: relative;
  width: 100%;
  max-width: 1500px;
  max-height: calc(100vh - 4rem);
  display: grid;
  gap: 0.85rem;
  justify-items: center;
}

.image-lightbox-close {
  position: absolute;
  top: -0.25rem;
  right: -0.25rem;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 999px;
  background: rgba(24, 20, 17, 0.75);
  color: #f6eadb;
  cursor: pointer;
}

.image-lightbox-close:hover {
  background: rgba(38, 31, 25, 0.9);
}

.image-lightbox-close:focus-visible {
  outline: 2px solid rgba(255, 255, 255, 0.55);
  outline-offset: 2px;
}

.image-lightbox-figure {
  margin: 0;
  display: grid;
  gap: 0.75rem;
  justify-items: center;
}

.image-lightbox-image {
  display: block;
  max-width: min(94vw, 1500px);
  max-height: calc(100vh - 7rem);
  width: auto;
  height: auto;
  border-radius: 18px;
  box-shadow: 0 32px 70px rgba(0, 0, 0, 0.42);
}

.image-lightbox-caption {
  max-width: min(90vw, 1100px);
  padding: 0.65rem 0.9rem;
  border-radius: 999px;
  background: rgba(24, 20, 17, 0.72);
  color: #f6eadb;
  text-align: center;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.9rem;
}

.note-body code {
  font-family: "SFMono-Regular", Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.9em;
}

.note-body :not(pre) > code {
  background: var(--inline-code-bg);
  color: var(--inline-code-text);
  padding: 0.12rem 0.34rem;
  border-radius: 6px;
}

.note-body pre {
  overflow-x: auto;
  padding: 1rem 1.1rem;
  border-radius: 12px;
  background: var(--code-bg);
  color: var(--code-text);
}

.note-body div.sourceCode {
  margin: 0.85rem 0;
  border-radius: 12px;
  overflow: hidden;
}

.note-body div.sourceCode pre {
  margin: 0;
}

.code-block {
  position: relative;
  margin: 0.85rem 0;
}

.code-block > pre,
.code-block > div.sourceCode {
  margin: 0;
}

.code-copy {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  z-index: 2;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.28rem 0.58rem;
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.10);
  color: #f0f0ed;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  line-height: 1;
  cursor: pointer;
  opacity: 0;
  transition: opacity 140ms ease, background 140ms ease, color 140ms ease, border-color 140ms ease;
}

.code-block:hover .code-copy,
.code-copy:focus-visible {
  opacity: 1;
}

.code-copy:hover {
  background: rgba(255, 255, 255, 0.2);
}

.code-copy.is-copied {
  opacity: 1;
  color: #a9e6a0;
  border-color: rgba(169, 230, 160, 0.45);
  background: rgba(169, 230, 160, 0.16);
}

@media (hover: none) {
  .code-copy {
    opacity: 1;
  }
}

.note-body pre code {
  background: transparent;
  padding: 0;
  color: inherit;
}

.note-body pre code.sourceCode,
.note-body pre code.sourceCode span {
  color: var(--code-variable);
}

.note-body pre code.sourceCode span.co,
.note-body pre code.sourceCode span.do {
  color: var(--code-comment);
  font-style: italic;
}

.note-body pre code.sourceCode span.kw,
.note-body pre code.sourceCode span.cf {
  color: var(--code-keyword);
  font-weight: 600;
}

.note-body pre code.sourceCode span.at {
  color: var(--code-annotation);
}

.note-body pre code.sourceCode span.st,
.note-body pre code.sourceCode span.ch,
.note-body pre code.sourceCode span.sc,
.note-body pre code.sourceCode span.vs {
  color: var(--code-string);
}

.note-body pre code.sourceCode span.dv,
.note-body pre code.sourceCode span.fl,
.note-body pre code.sourceCode span.bn,
.note-body pre code.sourceCode span.cn {
  color: var(--code-number);
}

.note-body pre code.sourceCode span.fu {
  color: var(--code-function);
}

.note-body pre code.sourceCode span.dt,
.note-body pre code.sourceCode span.bu,
.note-body pre code.sourceCode span.ot {
  color: var(--code-type);
}

.note-body pre code.sourceCode span.an,
.note-body pre code.sourceCode span.im,
.note-body pre code.sourceCode span.pp,
.note-body pre code.sourceCode span.in {
  color: var(--code-builtin);
}

.note-body pre code.sourceCode span.va {
  color: var(--code-variable);
}

.note-body pre code.sourceCode span.op {
  color: var(--code-operator);
}

.note-body pre code.sourceCode span.er {
  color: var(--code-error);
}

.note-body blockquote {
  padding: 0.4rem 1rem;
  border-left: 3px solid var(--accent);
  color: var(--muted);
  background: var(--surface-3);
  border-radius: 0 10px 10px 0;
}

.note-body hr {
  border: 0;
  border-top: 1px solid var(--panel-border);
  margin: 2rem 0;
}

.editor-shell {
  display: grid;
  gap: 1rem;
}

.editor-topbar {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.editor-topbar h1 {
  margin: 0.75rem 0 0;
  font-size: clamp(1.8rem, 3vw, 2.5rem);
  line-height: 1;
}

.editor-topbar p {
  margin: 0.75rem 0 0;
  color: var(--muted);
  max-width: 42rem;
  line-height: 1.6;
}

.editor-toolbar {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.editor-meta {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  column-gap: 1rem;
  row-gap: 0.75rem;
  align-items: end;
}

.editor-field {
  display: grid;
  gap: 0.38rem;
}

.editor-field span {
  color: var(--muted);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.editor-input,
.editor-textarea {
  width: 100%;
  border: 1px solid var(--panel-border);
  border-radius: 16px;
  background: var(--input-bg);
  color: var(--text);
  outline: none;
}

.editor-input {
  padding: 0.82rem 0.92rem;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.95rem;
}

select.editor-input {
  cursor: pointer;
}

.editor-input:focus,
.editor-textarea:focus {
  border-color: var(--ring);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--ring) 30%, transparent);
}

.editor-status {
  grid-column: 1 / -1;
  min-height: 1.2rem;
  color: var(--muted);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.82rem;
}

.editor-status[data-state="error"] {
  color: var(--danger);
}

.editor-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 1rem;
  min-height: 68vh;
}

.editor-pane {
  min-width: 0;
  overflow: hidden;
  border-radius: 18px;
  border: 1px solid var(--panel-border);
  background: var(--surface-3);
}

.editor-pane-header {
  padding: 0.78rem 0.9rem;
  border-bottom: 1px solid var(--panel-border);
  color: var(--muted);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.editor-textarea {
  min-height: calc(68vh - 3.4rem);
  padding: 1rem 1.05rem;
  resize: vertical;
  border: 0;
  border-radius: 0;
  background: transparent;
  font-family: "SFMono-Regular", Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.95rem;
  line-height: 1.65;
}

.editor-preview-frame {
  width: 100%;
  min-height: calc(68vh - 3.4rem);
  border: 0;
  background: transparent;
}

.editor-disabled {
  padding: 1rem 1.05rem;
  border-radius: 12px;
  border: 1px solid var(--panel-border);
  background: var(--danger-soft);
  color: var(--muted);
  line-height: 1.6;
}

.card-note-shell {
  display: grid;
  gap: 1rem;
  min-height: 0;
}

.card-note-intro {
  color: var(--muted);
  line-height: 1.7;
}

.card-note-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(280px, 360px));
  gap: 0.8rem;
  max-height: min(68vh, 760px);
  overflow-y: auto;
  padding-right: 0.25rem;
  align-content: start;
  justify-content: center;
  justify-items: stretch;
  overscroll-behavior: contain;
}

.card-note-card {
  display: grid;
  gap: 1rem;
  grid-template-rows: auto minmax(0, 1fr);
  align-content: start;
  width: 100%;
  max-width: 360px;
  min-height: 250px;
  padding: 1rem 1.05rem;
  border-radius: 18px;
  border: 1px solid var(--panel-border);
  background: var(--surface-2);
  overflow: hidden;
}

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

.card-note-link-card:hover {
  background: var(--accent-soft);
}

.card-note-header {
  display: grid;
  gap: 0.28rem;
  min-width: 0;
}

.card-note-header-top,
.note-link-header,
.tag-note-header,
.welcome-card-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.7rem;
}

.card-note-header span {
  color: var(--muted);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.card-note-header strong {
  font-size: 1.02rem;
  line-height: 1.3;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.card-note-description {
  color: var(--text);
  line-height: 1.7;
  min-width: 0;
  overflow: hidden;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.card-note-description > :first-child {
  margin-top: 0;
}

.card-note-description > :last-child {
  margin-bottom: 0;
}

.card-note-description p {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 8;
  overflow: hidden;
}

.note-body table {
  width: 100%;
  border-collapse: collapse;
}

.note-body th,
.note-body td {
  padding: 0.7rem 0.8rem;
  border: 1px solid var(--panel-border);
  text-align: left;
}

.toc-panel {
  padding: 0.95rem 0.84rem 1rem;
  height: 100%;
  overflow: auto;
  background: var(--toc-bg);
  border-left: 1px solid var(--separator);
}

.toc-panel h2 {
  margin: 0 0 0.1rem;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.07em;
  text-transform: uppercase;
  color: var(--muted);
}

.toc-panel p {
  margin: 0.22rem 0 0.48rem;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.5;
}

.toc-list {
  display: grid;
  gap: 0.08rem;
}

.toc-group {
  border-radius: 8px;
  border: 1px solid transparent;
  background: transparent;
  overflow: hidden;
}

.toc-group[open] {
  background: var(--surface-3);
}

.toc-group + .toc-group,
.toc-link + .toc-group,
.toc-group + .toc-link {
  margin-top: 0.08rem;
}

.toc-group-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.55rem;
  padding: 0.28rem 0.44rem;
  cursor: pointer;
  list-style: none;
}

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

.toc-group-summary:hover {
  background: var(--toc-hover);
}

.toc-group-summary:focus-visible,
.toc-link:focus-visible,
.toc-group-anchor:focus-visible {
  outline: 2px solid var(--ring);
  outline-offset: 1px;
}

.toc-group-label {
  min-width: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  color: var(--text);
  font-size: 0.84rem;
}

.toc-group-label::before {
  content: "";
  width: 0;
  height: 0;
  border-top: 4px solid transparent;
  border-bottom: 4px solid transparent;
  border-left: 5px solid var(--muted);
  transition: transform 120ms ease;
}

.toc-group[open] .toc-group-label::before {
  transform: rotate(90deg);
}

.toc-group-anchor {
  flex: 0 0 auto;
  padding: 0.14rem 0.4rem;
  border-radius: 999px;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.76rem;
}

.toc-group-anchor:hover {
  background: var(--accent-soft);
  color: var(--text);
}

.toc-sublist {
  display: grid;
  gap: 0.08rem;
  padding: 0 0.28rem 0.28rem;
}

.toc-link {
  display: block;
  padding: 0.24rem 0.42rem;
  border-radius: 10px;
  color: var(--muted);
  text-decoration: none;
  font-size: 0.84rem;
}

.toc-link:hover {
  background: var(--toc-hover);
  color: var(--text);
}

.toc-link.level-3 {
  margin-left: 0.6rem;
}

.toc-link.level-4 {
  margin-left: 1.1rem;
}

:root[data-view="focus"] .layout {
  width: min(1240px, calc(100vw - 2rem));
  grid-template-columns: minmax(0, 1fr);
}

:root[data-view="focus"] .layout.cards-layout {
  width: min(1240px, calc(100vw - 2rem));
}

:root[data-view="focus"] .layout.folder-open-layout {
  width: min(1240px, calc(100vw - 2rem));
}

:root[data-view="focus"] .layout.has-toc {
  width: min(1240px, calc(100vw - 2rem));
  grid-template-columns: minmax(0, 1fr);
}

:root[data-view="focus"] .sidebar {
  display: block;
  position: fixed;
  top: 1rem;
  left: 1rem;
  width: 320px;
  height: auto;
  max-height: calc(100vh - 2rem);
  overflow: auto;
  z-index: 40;
  background: var(--sidebar-bg);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  transform: translateX(calc(-100% - 1.5rem));
  opacity: 0;
  pointer-events: none;
  transition: transform 220ms cubic-bezier(0.22, 1, 0.36, 1), opacity 180ms ease;
}

:root[data-view="focus"] .toc-panel {
  display: block;
  position: fixed;
  top: 1rem;
  right: 1rem;
  width: 258px;
  height: auto;
  max-height: calc(100vh - 2rem);
  overflow: auto;
  z-index: 40;
  background: var(--toc-bg);
  border: 1px solid var(--panel-border);
  border-radius: 14px;
  box-shadow: var(--shadow);
  transform: translateX(calc(100% + 1.5rem));
  opacity: 0;
  pointer-events: none;
  transition: transform 220ms cubic-bezier(0.22, 1, 0.36, 1), opacity 180ms ease;
}

:root[data-view="focus"] .toc-panel.toc-panel-empty {
  display: none;
}

:root[data-view="focus"] .edge-hover-zone {
  position: fixed;
  top: 0;
  z-index: 38;
  display: block;
  width: 28px;
  height: 100vh;
}

:root[data-view="focus"] .edge-hover-zone-left {
  left: 0;
}

:root[data-view="focus"] .edge-hover-zone-right {
  right: 0;
}

:root[data-view="focus"] .edge-hover-zone::after {
  content: "";
  position: absolute;
  top: 50%;
  width: 4px;
  height: 52px;
  margin-top: -26px;
  border-radius: 999px;
  background: var(--scroll-thumb);
  transition: opacity 160ms ease;
}

:root[data-view="focus"] .edge-hover-zone-left::after {
  left: 7px;
}

:root[data-view="focus"] .edge-hover-zone-right::after {
  right: 7px;
}

:root[data-view="focus"] .edge-hover-zone:hover::after {
  opacity: 0;
}

:root[data-view="focus"] .edge-hover-zone-left:hover ~ .layout .sidebar,
:root[data-view="focus"] .sidebar:hover {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(0);
}

:root[data-view="focus"] .edge-hover-zone-right:hover ~ .layout .toc-panel:not(.toc-panel-empty),
:root[data-view="focus"] .toc-panel:hover {
  opacity: 1;
  pointer-events: auto;
  transform: translateX(0);
}

:root[data-view="focus"] .content-panel {
  width: 100%;
  min-height: calc(100vh - 2rem);
  padding: clamp(1.35rem, 2vw, 2.35rem);
}

:root[data-view="focus"] .content-panel > .content-header,
:root[data-view="focus"] .content-panel > .note-body {
  /* Keep a generous but bounded reading canvas when navigation is hidden. */
  width: min(100%, 70rem);
  margin-left: auto;
  margin-right: auto;
}

:root[data-view="focus"] .content-header-top {
  align-items: center;
}

:root[data-view="focus"] .content-header-tools {
  flex: 0 0 auto;
}

:root[data-view="focus"] .content-header p {
  max-width: 52rem;
}

:root[data-view="focus"] .content-panel > .welcome,
:root[data-view="focus"] .content-panel > .folder-summary {
  width: min(100%, 72rem);
  margin-left: auto;
  margin-right: auto;
}

:root[data-view="focus"] .content-panel > .card-note-shell {
  width: min(100%, 72rem);
  margin-left: auto;
  margin-right: auto;
}

:root[data-view="focus"] .content-panel > .folder-open-shell {
  width: min(100%, 72rem);
  margin-left: auto;
  margin-right: auto;
}

.welcome {
  display: grid;
  gap: 1.5rem;
}

.home-hero {
  position: relative;
  min-height: 238px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: clamp(1.4rem, 5vw, 4.6rem);
  padding: clamp(1.3rem, 3vw, 2.65rem) clamp(0.15rem, 1.4vw, 1rem) 1.8rem;
  overflow: hidden;
  border-bottom: 1px solid var(--separator);
}

.home-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.52;
  background-image: linear-gradient(to right, var(--separator) 1px, transparent 1px), linear-gradient(to bottom, var(--separator) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: linear-gradient(to right, #000 0%, #000 48%, transparent 92%);
}

.home-hero-copy,
.home-hero-mark {
  position: relative;
  z-index: 1;
}

.home-kicker,
.home-section-heading span:first-child {
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.home-hero h1 {
  margin: 0.45rem 0 0;
  font-size: clamp(3.1rem, 7vw, 5.8rem);
  line-height: 0.86;
  letter-spacing: -0.075em;
}

.home-hero p {
  max-width: 38rem;
  margin: 1rem 0 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.62;
}

.home-stat-list {
  display: flex;
  flex-wrap: wrap;
  gap: 1.35rem;
  margin: 1.3rem 0 0;
}

.home-stat {
  display: grid;
  gap: 0.08rem;
}

.home-stat strong {
  font-size: 1.08rem;
  line-height: 1;
}

.home-stat span {
  color: var(--muted);
  font-size: 0.78rem;
}

.home-hero-mark {
  width: clamp(118px, 16vw, 184px);
  height: clamp(118px, 16vw, 184px);
  display: grid;
  place-items: center;
  border: 1px solid var(--panel-border);
  border-radius: 30px;
  background: color-mix(in srgb, var(--accent-soft) 64%, var(--surface-2));
  box-shadow: var(--shadow-sm);
  transform: rotate(4deg);
}

.home-hero-mark img {
  width: 68%;
  height: 68%;
  display: block;
  filter: drop-shadow(0 10px 14px color-mix(in srgb, var(--accent) 22%, transparent));
}

.home-section {
  display: grid;
  gap: 0.82rem;
}

.home-section-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
}

.home-section-heading span:last-child {
  color: var(--muted);
  font-size: 0.82rem;
}

.home-folder-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 0;
  border-top: 1px solid var(--separator);
  border-left: 1px solid var(--separator);
}

.home-folder-card {
  min-height: 188px;
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 0.72rem;
  padding: 1rem 1.05rem;
  border-right: 1px solid var(--separator);
  border-bottom: 1px solid var(--separator);
  background: var(--content-bg);
  color: inherit;
  text-decoration: none;
  transition: background 150ms ease, color 150ms ease;
}

.home-folder-card:hover {
  background: var(--accent-soft);
}

.home-folder-index {
  color: var(--faint);
  font-family: "SFMono-Regular", Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.76rem;
}

.home-folder-card strong {
  display: block;
  font-size: 1.2rem;
  line-height: 1.15;
}

.home-folder-card p {
  margin: 0.48rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  line-height: 1.55;
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
}

.home-folder-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  color: var(--muted);
  font-size: 0.78rem;
}

.home-tags {
  display: grid;
  gap: 0.7rem;
  padding-top: 0.15rem;
}

.home-tags-copy {
  margin: 0;
  color: var(--muted);
  line-height: 1.55;
}

.home-tags-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.home-tags-footer .meta-row {
  margin-top: 0;
}

.home-tags-link {
  flex: 0 0 auto;
  color: var(--accent-strong);
  font-size: 0.88rem;
  font-weight: 600;
  text-decoration: none;
}

.home-tags-link:hover {
  text-decoration: underline;
  text-underline-offset: 0.18em;
}

.welcome-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 0.78rem;
}

.welcome-card,
.tag-section {
  display: block;
  padding: 0.92rem 0.98rem;
  border-radius: 16px;
  border: 1px solid var(--panel-border);
  background: var(--surface-2);
  text-decoration: none;
  min-width: 0;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.welcome-card:hover {
  background: var(--accent-soft);
}

.welcome-card strong,
.tag-note-link strong {
  display: block;
  font-size: 1rem;
}

.welcome-card-header strong,
.note-link-header strong,
.tag-note-header strong {
  margin: 0;
  flex: 1 1 auto;
  min-width: 0;
}

.welcome-card span,
.tag-note-link span {
  display: block;
  margin-top: 0.35rem;
  color: var(--muted);
  line-height: 1.55;
  overflow-wrap: anywhere;
}

.welcome-card-kicker {
  font-size: 0.82rem;
}

.welcome-card-path {
  font-size: 0.8rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.welcome-card-summary {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
}

.welcome-tips {
  padding: 0.95rem 1rem;
  border-radius: 16px;
  border: 1px solid var(--panel-border);
  background: var(--surface-2);
}

.welcome-tips h2 {
  margin: 0 0 0.55rem;
  font-size: 1rem;
}

.folder-hero {
  position: relative;
  isolation: isolate;
  padding: 0.2rem 0 1.3rem;
  border-bottom: 1px solid var(--separator);
  overflow: hidden;
}

.folder-hero h1 {
  margin: 0.7rem 0 0;
  font-size: clamp(2rem, 4vw, 3.25rem);
  line-height: 0.98;
  letter-spacing: -0.04em;
}

.folder-hero p {
  margin: 0.5rem 0 0;
  color: var(--muted);
  line-height: 1.62;
  max-width: 42rem;
}

.folder-summary {
  display: grid;
  gap: 1.18rem;
  width: min(100%, 86rem);
  margin-left: auto;
  margin-right: auto;
}

.folder-grid {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(300px, 1fr);
  gap: 0;
  align-items: stretch;
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x proximity;
  padding: 0;
  margin-bottom: 0.9rem;
  border-top: 1px solid var(--separator);
  border-left: 1px solid var(--separator);
}

.folder-column {
  display: grid;
  gap: 0.72rem;
  align-content: start;
  min-width: 0;
  padding: 1rem 1.05rem;
  border-right: 1px solid var(--separator);
  border-bottom: 1px solid var(--separator);
  background: var(--content-bg);
  scroll-snap-align: start;
}

.folder-column-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  min-width: 0;
}

.folder-column-title {
  display: grid;
  gap: 0.2rem;
  min-width: 0;
}

.folder-column-title strong {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.95rem;
  overflow-wrap: anywhere;
}

.folder-column-title span,
.folder-note-path {
  color: var(--muted);
  font-size: 0.8rem;
  line-height: 1.45;
  overflow-wrap: anywhere;
}

.folder-note-list {
  display: grid;
  gap: 0.58rem;
  align-content: start;
}

.folder-note-link,
.folder-child-link {
  display: grid;
  align-content: start;
  gap: 0.3rem;
  min-width: 0;
  min-height: 8.2rem;
  padding: 0.76rem 0.82rem;
  border-radius: 14px;
  border: 1px solid var(--panel-border);
  background: var(--content-bg);
  text-decoration: none;
  overflow: hidden;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.folder-note-link:hover,
.folder-child-link:hover {
  background: var(--accent-soft);
}

.folder-note-link strong,
.folder-child-link strong {
  display: -webkit-box;
  font-size: 0.98rem;
  line-height: 1.32;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
}

.folder-note-summary,
.folder-note-link span,
.folder-child-link span {
  display: -webkit-box;
  color: var(--muted);
  line-height: 1.5;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 3;
  overflow: hidden;
  overflow-wrap: anywhere;
}

.folder-note-path,
.folder-child-meta {
  font-size: 0.78rem;
  line-height: 1.42;
  -webkit-line-clamp: 1;
}

.folder-child-link {
  background: var(--surface-3);
}

.folder-child-link em {
  display: inline-block;
  margin-top: 0.45rem;
  color: var(--muted);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 0.74rem;
  font-style: normal;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.folder-column-empty {
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.55;
}

.folder-open-shell {
  display: grid;
  gap: 0.9rem;
  width: min(100%, 82rem);
  margin-left: auto;
  margin-right: auto;
}

.folder-open-sections {
  display: grid;
  gap: 0.82rem;
}

.folder-open-section {
  padding: 0.95rem 1rem;
  border-radius: 18px;
  border: 1px solid var(--panel-border);
  background: var(--surface-3);
}

.folder-open-section-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.8rem;
}

.folder-open-section-title {
  display: grid;
  gap: 0.2rem;
  min-width: 0;
}

.folder-open-section-title strong {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 1rem;
  overflow-wrap: anywhere;
}

.folder-open-section-title span {
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.5;
  overflow-wrap: anywhere;
}

.folder-open-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 0.76rem;
}

.sidebar,
.toc-panel,
.tree-wrap,
.folder-grid,
.folder-note-list,
.card-note-grid {
  scrollbar-width: thin;
  scrollbar-color: var(--scroll-thumb) transparent;
}

.sidebar::-webkit-scrollbar,
.toc-panel::-webkit-scrollbar,
.tree-wrap::-webkit-scrollbar,
.folder-grid::-webkit-scrollbar,
.folder-note-list::-webkit-scrollbar,
.card-note-grid::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

.sidebar::-webkit-scrollbar-track,
.toc-panel::-webkit-scrollbar-track,
.tree-wrap::-webkit-scrollbar-track,
.folder-grid::-webkit-scrollbar-track,
.folder-note-list::-webkit-scrollbar-track,
.card-note-grid::-webkit-scrollbar-track {
  background: transparent;
}

.sidebar::-webkit-scrollbar-thumb,
.toc-panel::-webkit-scrollbar-thumb,
.tree-wrap::-webkit-scrollbar-thumb,
.folder-grid::-webkit-scrollbar-thumb,
.folder-note-list::-webkit-scrollbar-thumb,
.card-note-grid::-webkit-scrollbar-thumb {
  background: var(--scroll-thumb);
  border: 1px solid transparent;
  border-radius: 999px;
  background-clip: padding-box;
}

.sidebar::-webkit-scrollbar-thumb:hover,
.toc-panel::-webkit-scrollbar-thumb:hover,
.tree-wrap::-webkit-scrollbar-thumb:hover,
.folder-grid::-webkit-scrollbar-thumb:hover,
.folder-note-list::-webkit-scrollbar-thumb:hover,
.card-note-grid::-webkit-scrollbar-thumb:hover {
  background: var(--scroll-thumb-hover);
  background-clip: padding-box;
}

.folder-empty {
  padding: 1rem 1.05rem;
  border-radius: 18px;
  border: 1px solid var(--panel-border);
  background: var(--surface-3);
  color: var(--muted);
  line-height: 1.6;
}

.tag-section + .tag-section {
  margin-top: 0.85rem;
}

.tag-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  margin-bottom: 0.8rem;
}

.tag-count {
  color: var(--muted);
  font-size: 0.8rem;
}

.tag-note-list {
  display: grid;
  gap: 0.7rem;
}

.tag-note-link {
  display: block;
  padding: 0.85rem 0.95rem;
  border-radius: 14px;
  border: 1px solid var(--panel-border);
  background: var(--surface-3);
  text-decoration: none;
}

.tag-note-link:hover {
  background: var(--accent-soft);
}

@media (max-width: 1180px) {
  .layout {
    grid-template-columns: minmax(240px, 290px) minmax(0, 1fr);
  }

  .layout.has-toc {
    grid-template-columns: minmax(238px, 286px) minmax(0, 1fr) minmax(196px, 224px);
  }

  .card-note-grid {
    grid-template-columns: repeat(2, minmax(280px, 360px));
  }
}

@media (max-width: 860px) {
  .layout,
  .layout.has-toc {
    width: min(100vw - 1rem, 980px);
    height: auto;
    overflow: visible;
    grid-template-columns: 1fr;
    border-radius: 14px;
  }

  .sidebar,
  .content-panel,
  .toc-panel {
    height: auto;
    max-height: none;
    overflow: visible;
  }

  .sidebar {
    border-right: 0;
    border-bottom: 1px solid var(--separator);
  }

  .toc-panel {
    border-left: 0;
    border-top: 1px solid var(--separator);
  }

  .floating-controls {
    top: 0.75rem;
    right: 0.75rem;
  }

  .content-header-top {
    flex-wrap: wrap;
  }

  .content-header-tools {
    width: 100%;
    margin-left: 0;
    justify-content: space-between;
  }

  .folder-grid {
    grid-auto-columns: minmax(84vw, 1fr);
  }

  .editor-meta,
  .editor-grid {
    grid-template-columns: 1fr;
  }

  .card-note-grid {
    grid-template-columns: minmax(0, 360px);
    max-height: none;
    overflow: visible;
    padding-right: 0;
    justify-content: center;
  }

  .home-hero {
    grid-template-columns: 1fr;
    gap: 1.4rem;
  }

  .home-hero-mark {
    width: 96px;
    height: 96px;
  }

  :root[data-view="focus"] .content-panel > .content-header,
  :root[data-view="focus"] .content-panel > .note-body,
  :root[data-view="focus"] .content-panel > .welcome,
  :root[data-view="focus"] .content-panel > .folder-summary,
  :root[data-view="focus"] .content-panel > .folder-open-shell,
  :root[data-view="focus"] .content-panel > .card-note-shell {
    width: 100%;
  }

  :root[data-view="focus"] .edge-hover-zone {
    display: none;
  }

  :root[data-view="focus"] .sidebar,
  :root[data-view="focus"] .toc-panel {
    position: static;
    width: auto;
    max-height: none;
    transform: none;
    opacity: 1;
    pointer-events: auto;
    box-shadow: none;
    border-radius: 0;
  }
}