/* ============================================================
   kWom Library — Notion-style stylesheet
   ============================================================ */

* { box-sizing: border-box; margin: 0; padding: 0; }
*::selection { background: rgba(35, 131, 226, 0.28); }

:root {
  /* Light theme (Notion-like) */
  --bg-app:       #ffffff;
  --bg-sidebar:   #fbfbfa;
  --bg-hover:     rgba(55, 53, 47, 0.06);
  --bg-active:    rgba(55, 53, 47, 0.10);
  --bg-overlay:   rgba(255, 255, 255, 0.97);
  --bg-card:      #ffffff;
  --bg-input:     #ffffff;
  --bg-callout:   rgba(241, 241, 239, 0.6);
  --bg-code:      rgba(135, 131, 120, 0.15);

  --fg-primary:   rgb(55, 53, 47);
  --fg-secondary: rgba(55, 53, 47, 0.65);
  --fg-tertiary:  rgba(55, 53, 47, 0.45);
  --fg-on-accent: #ffffff;

  --border-sub:   rgba(55, 53, 47, 0.09);
  --border-md:    rgba(55, 53, 47, 0.14);
  --border-strong: rgba(55, 53, 47, 0.25);

  --accent:       rgb(35, 131, 226);
  --accent-hover: rgb(28, 105, 181);
  --accent-soft:  rgba(35, 131, 226, 0.12);
  --danger:       rgb(212, 76, 71);
  --danger-soft:  rgba(212, 76, 71, 0.12);
  --warn:         rgb(217, 115, 13);
  --success:      rgb(68, 131, 97);

  --shadow-sm:    0 1px 2px rgba(15, 15, 15, 0.04), 0 1px 4px rgba(15, 15, 15, 0.06);
  --shadow-md:    0 4px 12px rgba(15, 15, 15, 0.08), 0 2px 4px rgba(15, 15, 15, 0.06);
  --shadow-lg:    0 12px 28px rgba(15, 15, 15, 0.14), 0 4px 8px rgba(15, 15, 15, 0.08);
  --shadow-pop:   rgba(15, 15, 15, 0.05) 0px 0px 0px 1px,
                  rgba(15, 15, 15, 0.1) 0px 3px 6px,
                  rgba(15, 15, 15, 0.2) 0px 9px 24px;

  --radius-sm:    3px;
  --radius-md:    6px;
  --radius-lg:    10px;
  --radius-xl:    16px;

  --font-ui:      ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", "Roboto", "Helvetica Neue", Arial, sans-serif;
  --font-serif:   "Lyon Text", Georgia, "Times New Roman", serif;
  --font-mono:    "SFMono-Regular", Menlo, Consolas, "PT Mono", "Liberation Mono", Courier, monospace;

  --sidebar-w:    260px;
  --content-max:  900px;
  --topbar-h:     45px;
}

body.theme-dark {
  --bg-app:       #191919;
  --bg-sidebar:   #202020;
  --bg-hover:     rgba(255, 255, 255, 0.055);
  --bg-active:    rgba(255, 255, 255, 0.09);
  --bg-overlay:   rgba(37, 37, 37, 0.97);
  --bg-card:      #2a2a2a;
  --bg-input:     #2c2c2c;
  --bg-callout:   rgba(255, 255, 255, 0.03);
  --bg-code:      rgba(255, 255, 255, 0.075);

  --fg-primary:   rgba(255, 255, 255, 0.9);
  --fg-secondary: rgba(255, 255, 255, 0.6);
  --fg-tertiary:  rgba(255, 255, 255, 0.4);

  --border-sub:   rgba(255, 255, 255, 0.07);
  --border-md:    rgba(255, 255, 255, 0.13);
  --border-strong: rgba(255, 255, 255, 0.22);

  --accent:       rgb(35, 131, 226);
  --accent-hover: rgb(56, 152, 240);
  --accent-soft:  rgba(35, 131, 226, 0.18);

  --shadow-sm:    0 1px 2px rgba(0, 0, 0, 0.3), 0 1px 4px rgba(0, 0, 0, 0.2);
  --shadow-md:    0 4px 12px rgba(0, 0, 0, 0.35), 0 2px 4px rgba(0, 0, 0, 0.2);
  --shadow-lg:    0 12px 28px rgba(0, 0, 0, 0.5), 0 4px 8px rgba(0, 0, 0, 0.3);
  --shadow-pop:   rgba(0, 0, 0, 0.2) 0px 0px 0px 1px,
                  rgba(0, 0, 0, 0.3) 0px 3px 6px,
                  rgba(0, 0, 0, 0.4) 0px 9px 24px;
}

html, body {
  height: 100%;
  background: var(--bg-app);
  color: var(--fg-primary);
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow: hidden;
}

button {
  font: inherit;
  background: transparent;
  border: 0;
  cursor: pointer;
  color: inherit;
}

input, textarea { font: inherit; color: inherit; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.ic-sm { width: 16px; height: 16px; flex-shrink: 0; }

/* ============================================================
   AUTH GATE
   ============================================================ */
.auth-gate {
  position: fixed; inset: 0;
  display: flex; align-items: center; justify-content: center;
  background: linear-gradient(135deg, var(--bg-app) 0%, var(--bg-sidebar) 100%);
  z-index: 100;
}
.auth-card {
  width: 420px; max-width: 92vw;
  background: var(--bg-card);
  border: 1px solid var(--border-sub);
  border-radius: var(--radius-xl);
  padding: 36px 32px;
  box-shadow: var(--shadow-lg);
}
.auth-brand {
  display: flex; align-items: center; gap: 14px;
  margin-bottom: 22px;
}
.auth-icon { width: 36px; height: 36px; color: var(--accent); }
.auth-title { font-size: 22px; font-weight: 700; line-height: 1.2; }
.auth-sub { font-size: 14px; color: var(--fg-secondary); margin-top: 2px; }
.auth-msg { font-size: 14px; color: var(--fg-secondary); margin-bottom: 24px; line-height: 1.55; }
.auth-msg p + p { margin-top: 8px; }

/* ============================================================
   APP layout
   ============================================================ */
.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) 1fr;
  height: 100vh;
  overflow: hidden;
}

/* ============================================================
   SIDEBAR
   ============================================================ */
.sidebar {
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border-sub);
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
}

.sidebar-head {
  display: flex; align-items: center; gap: 6px;
  padding: 10px 10px 6px;
}
.user-chip {
  flex: 1;
  display: flex; align-items: center; gap: 8px;
  padding: 6px 8px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  transition: background .12s;
  min-width: 0;
}
.user-chip:hover { background: var(--bg-hover); }
.user-avatar {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-size: 12px; font-weight: 600;
  flex-shrink: 0;
}
.user-name {
  flex: 1;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
}
.board-link {
  width: 28px; height: 28px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-md);
  color: var(--fg-secondary);
  transition: background .12s, color .12s;
}
.board-link:hover { background: var(--bg-hover); color: var(--fg-primary); }

.sidebar-search {
  margin: 4px 10px 8px;
  padding: 6px 10px;
  display: flex; align-items: center; gap: 8px;
  background: var(--bg-input);
  border: 1px solid var(--border-sub);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--fg-tertiary);
  transition: border-color .12s;
}
.sidebar-search:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}
.sidebar-search input {
  flex: 1;
  border: 0; outline: 0;
  background: transparent;
  color: var(--fg-primary);
  font-size: 14px;
  min-width: 0;
}
.kbd-hint {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 1px 5px;
  border: 1px solid var(--border-sub);
  border-radius: 3px;
  color: var(--fg-tertiary);
  background: var(--bg-app);
}

.sidebar-nav {
  padding: 0 6px 8px;
}
.nav-item {
  display: flex; align-items: center; gap: 8px;
  padding: 5px 8px;
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--fg-secondary);
  transition: background .1s, color .1s;
  cursor: pointer;
}
.nav-item:hover { background: var(--bg-hover); color: var(--fg-primary); text-decoration: none; }
.nav-item.is-active { background: var(--bg-active); color: var(--fg-primary); }

.sidebar-tree-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 14px 4px;
}
.tree-head-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--fg-tertiary);
}
.btn-icon {
  width: 22px; height: 22px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--fg-secondary);
  opacity: 0.7;
  transition: opacity .12s, background .12s, color .12s;
}
.btn-icon:hover { background: var(--bg-hover); opacity: 1; color: var(--fg-primary); }

.sidebar-tree {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 0 6px 8px;
}
.sidebar-tree::-webkit-scrollbar { width: 8px; }
.sidebar-tree::-webkit-scrollbar-thumb {
  background: var(--border-md);
  border-radius: 4px;
}
.sidebar-tree::-webkit-scrollbar-thumb:hover { background: var(--border-strong); }
.sidebar-tree::-webkit-scrollbar-track { background: transparent; }

.tree-empty {
  padding: 12px 14px;
  font-size: 13px;
  color: var(--fg-tertiary);
  font-style: italic;
}

/* Tree node */
.tree-node {
  position: relative;
}
.tree-row {
  display: flex; align-items: center; gap: 2px;
  padding: 4px 8px 4px 4px;
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--fg-secondary);
  cursor: pointer;
  user-select: none;
  position: relative;
  min-height: 28px;
}
.tree-row:hover { background: var(--bg-hover); color: var(--fg-primary); }
.tree-row.is-active {
  background: var(--bg-active);
  color: var(--fg-primary);
  font-weight: 500;
}
.tree-row.is-drop-target {
  background: var(--accent-soft);
  outline: 1px solid var(--accent);
}
.tree-toggle {
  width: 18px; height: 18px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  color: var(--fg-tertiary);
  opacity: 0;
  flex-shrink: 0;
  transition: transform .12s, opacity .12s, background .12s;
}
.tree-row:hover .tree-toggle,
.tree-row.has-children .tree-toggle { opacity: 1; }
.tree-toggle.is-open { transform: rotate(90deg); }
.tree-toggle:hover { background: var(--bg-hover); }

.tree-icon {
  width: 18px; height: 18px;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0;
  font-size: 14px;
  color: var(--fg-tertiary);
}
.tree-icon svg { width: 16px; height: 16px; }
.tree-icon.is-emoji { font-size: 15px; }

.tree-title {
  flex: 1;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap;
  margin-left: 2px;
}
.tree-actions {
  display: none;
  gap: 2px;
  align-items: center;
}
.tree-row:hover .tree-actions { display: flex; }

.tree-children {
  margin-left: 14px;
  border-left: 1px solid var(--border-sub);
  padding-left: 0;
}

.sidebar-foot {
  display: flex; align-items: center; gap: 6px;
  padding: 8px 10px 12px;
  border-top: 1px solid var(--border-sub);
}
.btn-ghost {
  flex: 1;
  display: flex; align-items: center; gap: 8px;
  padding: 6px 10px;
  border-radius: var(--radius-md);
  font-size: 13px;
  color: var(--fg-secondary);
  transition: background .12s, color .12s;
}
.btn-ghost:hover { background: var(--bg-hover); color: var(--fg-primary); }
.btn-theme { flex: 0 0 auto; padding: 6px; }
.btn-theme .i-light { display: block; }
.btn-theme .i-dark { display: none; }
body.theme-dark .btn-theme .i-light { display: none; }
body.theme-dark .btn-theme .i-dark { display: block; }

/* ============================================================
   CONTENT
   ============================================================ */
.content {
  display: flex;
  flex-direction: column;
  height: 100vh;
  overflow: hidden;
  position: relative;
}

.content-toolbar {
  height: var(--topbar-h);
  flex-shrink: 0;
  display: flex; align-items: center;
  padding: 0 16px;
  gap: 12px;
  background: var(--bg-app);
  border-bottom: 1px solid var(--border-sub);
  position: sticky; top: 0; z-index: 5;
}
.breadcrumbs {
  flex: 1;
  display: flex; align-items: center; gap: 4px;
  font-size: 13px;
  color: var(--fg-secondary);
  overflow: hidden;
  white-space: nowrap;
}
.breadcrumbs a {
  color: var(--fg-secondary);
  padding: 4px 6px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background .12s, color .12s;
}
.breadcrumbs a:hover { background: var(--bg-hover); color: var(--fg-primary); }
.breadcrumbs .sep {
  color: var(--fg-tertiary);
  user-select: none;
}
.breadcrumbs .current { color: var(--fg-primary); }

.toolbar-right {
  display: flex; align-items: center; gap: 4px;
}
.save-status {
  font-size: 12px;
  color: var(--fg-tertiary);
  margin-right: 8px;
  min-width: 50px;
  text-align: right;
  transition: opacity .2s;
}
.save-status.is-saving { color: var(--warn); }
.save-status.is-saved { color: var(--success); }
.btn-icon.is-active svg { color: var(--warn); fill: var(--warn); }

/* Views */
.view {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: 0;
}
.view::-webkit-scrollbar { width: 12px; }
.view::-webkit-scrollbar-thumb {
  background: var(--border-md);
  border-radius: 6px;
  border: 3px solid var(--bg-app);
}
.view::-webkit-scrollbar-thumb:hover { background: var(--border-strong); }
.view::-webkit-scrollbar-track { background: transparent; }

.view-h {
  padding: 60px 96px 0;
  max-width: var(--content-max);
  margin: 0 auto;
  font-size: 30px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

/* Welcome */
.welcome {
  max-width: 720px;
  margin: 0 auto;
  padding: 100px 32px 64px;
  text-align: center;
}
.welcome-icon { font-size: 56px; margin-bottom: 18px; }
.welcome h1 {
  font-size: 36px;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 12px;
}
.welcome p {
  font-size: 16px;
  color: var(--fg-secondary);
  margin-bottom: 32px;
}
.welcome-actions {
  display: flex; gap: 12px; justify-content: center;
  margin-bottom: 56px;
  flex-wrap: wrap;
}
.welcome-recent {
  text-align: left;
  margin-top: 16px;
}
.welcome-recent h3 {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--fg-tertiary);
  margin-bottom: 8px;
}
.welcome-recent ul { list-style: none; }
.welcome-recent li {
  padding: 8px 10px;
  border-radius: var(--radius-md);
  cursor: pointer;
  display: flex; align-items: center; gap: 8px;
  font-size: 14px;
  color: var(--fg-secondary);
  transition: background .12s, color .12s;
}
.welcome-recent li:hover { background: var(--bg-hover); color: var(--fg-primary); }
.welcome-recent li .ago {
  margin-left: auto;
  font-size: 12px;
  color: var(--fg-tertiary);
}

/* ============================================================
   PAGE VIEW (editor)
   ============================================================ */
.view-page {
  display: flex; flex-direction: column;
}
.page-cover {
  height: 200px;
  width: 100%;
  background: linear-gradient(135deg, var(--accent-soft), var(--bg-callout));
  background-size: cover;
  background-position: center;
  position: relative;
  flex-shrink: 0;
}
.page-cover-change {
  position: absolute;
  bottom: 12px; right: 16px;
  padding: 6px 10px;
  background: var(--bg-overlay);
  border: 1px solid var(--border-md);
  border-radius: var(--radius-md);
  font-size: 12px;
  color: var(--fg-secondary);
  opacity: 0;
  transition: opacity .15s;
  backdrop-filter: blur(8px);
}
.page-cover:hover .page-cover-change { opacity: 1; }

.page-head, .file-head {
  max-width: var(--content-max);
  width: 100%;
  margin: 0 auto;
  padding: 48px 96px 12px;
  position: relative;
}
.view-page.has-cover .page-head { padding-top: 24px; }

.page-icon {
  font-size: 56px;
  line-height: 1;
  margin-left: -4px;
  margin-bottom: 8px;
  padding: 0 4px;
  border-radius: var(--radius-sm);
  transition: background .12s;
  display: inline-block;
}
.page-icon:hover { background: var(--bg-hover); }

.page-title {
  width: 100%;
  border: 0; outline: 0;
  background: transparent;
  color: var(--fg-primary);
  font-family: var(--font-ui);
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  padding: 4px 0;
}
.page-title::placeholder { color: var(--fg-tertiary); }

.page-meta, .file-meta {
  display: flex; align-items: center; gap: 12px;
  margin-top: 12px;
  font-size: 13px;
  color: var(--fg-tertiary);
}
.page-meta .meta-item, .file-meta .meta-item {
  display: flex; align-items: center; gap: 6px;
}

.page-body {
  max-width: var(--content-max);
  width: 100%;
  margin: 0 auto;
  padding: 8px 96px 200px;
}

#editor-holder {
  font-size: 16px;
  line-height: 1.6;
  color: var(--fg-primary);
}

/* EditorJS theme overrides */
.codex-editor__redactor { padding-bottom: 200px !important; }
.ce-block__content,
.ce-toolbar__content { max-width: 100% !important; }
.ce-paragraph { line-height: 1.6; padding: 3px 2px; }
.ce-header { padding: 8px 0 2px; line-height: 1.25; }
h1.ce-header { font-size: 32px; font-weight: 700; }
h2.ce-header { font-size: 24px; font-weight: 600; }
h3.ce-header { font-size: 20px; font-weight: 600; }
h4.ce-header { font-size: 17px; font-weight: 600; }
.cdx-checklist__item { padding: 4px 0; }
.cdx-list { padding-left: 18px; line-height: 1.6; }
.cdx-quote {
  padding: 6px 12px;
  border-left: 3px solid var(--border-strong);
  color: var(--fg-secondary);
  font-style: italic;
}
.cdx-warning {
  padding: 12px 14px;
  border-radius: var(--radius-md);
  background: var(--bg-callout);
}
.ce-code__textarea, .cdx-code {
  font-family: var(--font-mono);
  font-size: 13.5px;
  background: var(--bg-code);
  border-radius: var(--radius-md);
  padding: 10px 12px;
  color: var(--fg-primary);
  white-space: pre-wrap;
}
.ce-inline-tool, .ce-toolbar__plus, .ce-toolbar__settings-btn {
  color: var(--fg-secondary);
}
.ce-toolbar__plus:hover, .ce-toolbar__settings-btn:hover {
  background: var(--bg-hover);
}
.ce-popover {
  background: var(--bg-card) !important;
  border: 1px solid var(--border-sub) !important;
  box-shadow: var(--shadow-pop) !important;
  border-radius: var(--radius-md) !important;
}
.ce-popover-item:hover { background: var(--bg-hover) !important; }
.ce-popover-item__title { color: var(--fg-primary); }
.ce-popover-item__icon { background: var(--bg-callout) !important; color: var(--fg-primary); }

/* Inline code & marker */
.cdx-marker { background: rgba(245, 224, 80, 0.6); padding: 0 2px; }
body.theme-dark .cdx-marker { background: rgba(245, 224, 80, 0.25); color: #fff8c0; }
code.inline-code {
  font-family: var(--font-mono);
  font-size: 0.92em;
  background: var(--bg-code);
  padding: 2px 6px;
  border-radius: 4px;
  color: var(--danger);
}

/* Tables in editor */
.tc-table { border: 1px solid var(--border-md); border-radius: var(--radius-md); overflow: hidden; }
.tc-row { border-bottom: 1px solid var(--border-sub); }
.tc-cell { padding: 8px 12px; border-right: 1px solid var(--border-sub); }
.tc-row:last-child { border-bottom: 0; }
.tc-cell:last-child { border-right: 0; }

/* ============================================================
   FILE VIEW
   ============================================================ */
.file-head .page-icon { cursor: default; }
.file-head .page-icon:hover { background: transparent; }
.file-viewer {
  max-width: var(--content-max);
  width: 100%;
  margin: 0 auto;
  padding: 8px 32px 200px;
  font-size: 16px;
  line-height: 1.6;
}
.file-viewer .loading {
  text-align: center;
  padding: 80px 0;
  color: var(--fg-tertiary);
  font-size: 14px;
}

/* Markdown / DOCX rendered */
.rendered {
  font-family: var(--font-ui);
  font-size: 16px;
  line-height: 1.7;
  color: var(--fg-primary);
}
.rendered h1 { font-size: 32px; font-weight: 700; margin: 24px 0 12px; line-height: 1.2; letter-spacing: -0.01em; }
.rendered h2 { font-size: 24px; font-weight: 600; margin: 22px 0 10px; line-height: 1.25; }
.rendered h3 { font-size: 20px; font-weight: 600; margin: 18px 0 8px; }
.rendered h4 { font-size: 17px; font-weight: 600; margin: 16px 0 6px; }
.rendered p, .rendered ul, .rendered ol { margin: 6px 0; }
.rendered ul, .rendered ol { padding-left: 24px; }
.rendered li { margin: 2px 0; }
.rendered blockquote {
  padding: 4px 0 4px 16px;
  border-left: 3px solid var(--border-strong);
  color: var(--fg-secondary);
  margin: 12px 0;
}
.rendered pre {
  background: var(--bg-code);
  padding: 12px 14px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.5;
  margin: 12px 0;
}
.rendered code:not(pre code) {
  font-family: var(--font-mono);
  font-size: 0.9em;
  background: var(--bg-code);
  padding: 2px 5px;
  border-radius: 4px;
  color: var(--danger);
}
.rendered table {
  border-collapse: collapse;
  margin: 16px 0;
  max-width: 100%;
  display: block;
  overflow-x: auto;
}
.rendered table th, .rendered table td {
  border: 1px solid var(--border-md);
  padding: 8px 12px;
  text-align: left;
}
.rendered table th { background: var(--bg-callout); font-weight: 600; }
.rendered img {
  max-width: 100%;
  border-radius: var(--radius-md);
  margin: 8px 0;
  box-shadow: var(--shadow-sm);
}
.rendered a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.rendered hr {
  border: 0;
  border-top: 1px solid var(--border-sub);
  margin: 22px 0;
}

/* PDF & embed viewers */
.pdf-viewer { width: 100%; height: 80vh; border: 1px solid var(--border-sub); border-radius: var(--radius-md); }
.image-viewer {
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-callout);
  border-radius: var(--radius-md);
  padding: 24px;
}
.image-viewer img { max-width: 100%; max-height: 75vh; border-radius: var(--radius-sm); }

/* XLSX viewer (sheetjs html) */
.xlsx-viewer {
  overflow: auto;
  max-height: 80vh;
  border: 1px solid var(--border-sub);
  border-radius: var(--radius-md);
}
.xlsx-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 12px;
  border-bottom: 1px solid var(--border-sub);
  overflow-x: auto;
}
.xlsx-tab {
  padding: 6px 14px;
  font-size: 13px;
  color: var(--fg-secondary);
  border-bottom: 2px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  transition: color .1s, border-color .1s;
}
.xlsx-tab:hover { color: var(--fg-primary); }
.xlsx-tab.is-active {
  color: var(--accent);
  border-color: var(--accent);
}
.xlsx-viewer table {
  border-collapse: collapse;
  min-width: 100%;
  font-size: 13px;
}
.xlsx-viewer th, .xlsx-viewer td {
  border: 1px solid var(--border-sub);
  padding: 4px 8px;
  white-space: nowrap;
}
.xlsx-viewer th { background: var(--bg-callout); font-weight: 600; position: sticky; top: 0; }

/* Code viewer */
.code-viewer {
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.5;
  background: var(--bg-code);
  padding: 16px 18px;
  border-radius: var(--radius-md);
  overflow-x: auto;
  white-space: pre;
}
.code-viewer .hljs-keyword { color: #ad3da4; }
.code-viewer .hljs-string { color: #c41a16; }
.code-viewer .hljs-number { color: #1c00cf; }
.code-viewer .hljs-comment { color: #707070; font-style: italic; }
.code-viewer .hljs-title, .code-viewer .hljs-class .hljs-title { color: #3f6e74; }
.code-viewer .hljs-function .hljs-title { color: #008a8a; }
body.theme-dark .code-viewer .hljs-keyword { color: #ff7ab2; }
body.theme-dark .code-viewer .hljs-string { color: #fc6a5d; }
body.theme-dark .code-viewer .hljs-number { color: #d0bf69; }
body.theme-dark .code-viewer .hljs-comment { color: #6c7986; }
body.theme-dark .code-viewer .hljs-title { color: #6bdfff; }
body.theme-dark .code-viewer .hljs-function .hljs-title { color: #67b7a4; }

/* HTML viewer (sanitized) */
.html-viewer {
  border: 1px solid var(--border-sub);
  border-radius: var(--radius-md);
  padding: 24px;
  background: var(--bg-card);
}

/* Generic file fallback */
.file-fallback {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  padding: 56px 24px;
  border: 1px dashed var(--border-md);
  border-radius: var(--radius-lg);
  text-align: center;
}
.file-fallback-icon { font-size: 48px; }
.file-fallback h3 { font-size: 18px; font-weight: 600; }
.file-fallback p { color: var(--fg-secondary); font-size: 14px; max-width: 360px; }

/* ============================================================
   SEARCH RESULTS
   ============================================================ */
.search-results {
  max-width: var(--content-max);
  margin: 24px auto 0;
  padding: 0 96px 200px;
}
.search-results .empty {
  padding: 48px 0;
  text-align: center;
  color: var(--fg-tertiary);
  font-size: 14px;
}
.search-item {
  display: block;
  padding: 12px 14px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background .1s;
  margin-bottom: 4px;
}
.search-item:hover { background: var(--bg-hover); }
.search-item-title {
  display: flex; align-items: center; gap: 8px;
  font-size: 15px;
  font-weight: 500;
  color: var(--fg-primary);
  margin-bottom: 2px;
}
.search-item-snippet {
  font-size: 13px;
  color: var(--fg-secondary);
  line-height: 1.45;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.search-item-snippet mark {
  background: rgba(245, 224, 80, 0.6);
  padding: 0 2px;
  border-radius: 2px;
}
body.theme-dark .search-item-snippet mark {
  background: rgba(245, 224, 80, 0.3);
  color: #fff8c0;
}

/* ============================================================
   DOC LIST (recent / favorites)
   ============================================================ */
.doc-list {
  list-style: none;
  max-width: var(--content-max);
  margin: 24px auto 0;
  padding: 0 96px 200px;
}
.doc-list li {
  display: flex; align-items: center; gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: background .1s;
  margin-bottom: 2px;
  font-size: 14px;
  color: var(--fg-primary);
}
.doc-list li:hover { background: var(--bg-hover); }
.doc-list li .doc-icon { font-size: 16px; flex-shrink: 0; width: 22px; text-align: center; }
.doc-list li .doc-title { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.doc-list li .doc-meta { font-size: 12px; color: var(--fg-tertiary); }

/* ============================================================
   BUTTONS
   ============================================================ */
.btn {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 14px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background .12s, border-color .12s, box-shadow .12s;
}
.btn-primary {
  background: var(--accent);
  color: var(--fg-on-accent);
}
.btn-primary:hover { background: var(--accent-hover); }
.btn-secondary {
  background: var(--bg-card);
  color: var(--fg-primary);
  border-color: var(--border-md);
}
.btn-secondary:hover { background: var(--bg-hover); }
.btn-block { width: 100%; justify-content: center; }
.btn-lg { padding: 10px 18px; font-size: 15px; }

/* ============================================================
   CTX-MENU + USER-MENU + EMOJI-PICKER (popovers)
   ============================================================ */
.ctx-menu, .user-menu, .emoji-picker {
  position: fixed;
  background: var(--bg-card);
  border: 1px solid var(--border-sub);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-pop);
  padding: 4px;
  z-index: 1000;
  min-width: 200px;
}
.ctx-menu button, .user-menu button {
  display: flex; align-items: center; gap: 8px;
  width: 100%;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  text-align: left;
  color: var(--fg-primary);
  transition: background .1s;
}
.ctx-menu button:hover, .user-menu button:hover { background: var(--bg-hover); }
.ctx-menu button.danger, .user-menu button.danger { color: var(--danger); }
.ctx-menu hr, .user-menu hr {
  border: 0;
  border-top: 1px solid var(--border-sub);
  margin: 4px -4px;
}

.user-menu-head {
  padding: 8px 10px 4px;
}
.user-menu-head #user-menu-name { font-size: 13px; font-weight: 600; display: block; }
.user-menu-role { font-size: 11px; color: var(--fg-tertiary); }

.emoji-picker {
  width: 340px;
  height: 320px;
  display: flex; flex-direction: column;
}
.emoji-picker-search {
  padding: 8px 8px 4px;
}
.emoji-picker-search input {
  width: 100%;
  padding: 6px 10px;
  background: var(--bg-input);
  border: 1px solid var(--border-sub);
  border-radius: var(--radius-md);
  font-size: 13px;
  outline: 0;
}
.emoji-picker-search input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}
.emoji-grid {
  flex: 1;
  overflow-y: auto;
  padding: 4px 6px 8px;
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: 2px;
}
.emoji-grid button {
  font-size: 22px;
  padding: 4px;
  border-radius: var(--radius-sm);
  transition: background .1s;
  text-align: center;
}
.emoji-grid button:hover { background: var(--bg-hover); }

/* ============================================================
   TOAST
   ============================================================ */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 2000;
  display: flex;
  flex-direction: column;
  gap: 8px;
  pointer-events: none;
}
.toast {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 14px;
  background: var(--bg-card);
  border: 1px solid var(--border-md);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  font-size: 13.5px;
  color: var(--fg-primary);
  max-width: 360px;
  pointer-events: auto;
  animation: toast-in .25s ease-out;
}
.toast.toast-out {
  animation: toast-out .2s ease-in forwards;
}
.toast-success { border-color: var(--success); }
.toast-error { border-color: var(--danger); color: var(--danger); }
.toast-info { border-color: var(--accent); }
.toast .ic-sm { color: inherit; flex-shrink: 0; }

@keyframes toast-in {
  from { opacity: 0; transform: translateX(20px); }
  to   { opacity: 1; transform: translateX(0); }
}
@keyframes toast-out {
  to { opacity: 0; transform: translateX(20px); }
}

/* ============================================================
   DROP-ZONE / DRAG INDICATORS
   ============================================================ */
.drop-overlay {
  position: fixed;
  inset: 0;
  background: rgba(35, 131, 226, 0.08);
  border: 3px dashed var(--accent);
  border-radius: var(--radius-lg);
  display: flex; align-items: center; justify-content: center;
  z-index: 1500;
  pointer-events: none;
}
.drop-overlay-text {
  background: var(--bg-card);
  padding: 20px 36px;
  border-radius: var(--radius-lg);
  font-size: 16px;
  font-weight: 600;
  color: var(--accent);
  border: 1px solid var(--border-md);
  box-shadow: var(--shadow-md);
}

.tree-row.drop-line-above::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: -1px;
  height: 2px;
  background: var(--accent);
  pointer-events: none;
}
.tree-row.drop-line-below::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 2px;
  background: var(--accent);
  pointer-events: none;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media (max-width: 920px) {
  .app { grid-template-columns: 0 1fr; }
  .sidebar {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    width: var(--sidebar-w);
    z-index: 50;
    transform: translateX(-100%);
    transition: transform .2s;
    box-shadow: var(--shadow-lg);
  }
  body.sidebar-open .sidebar { transform: translateX(0); }
  .page-head, .file-head, .page-body, .file-viewer, .view-h, .doc-list, .search-results {
    padding-left: 24px !important;
    padding-right: 24px !important;
  }
  .welcome { padding: 60px 24px 32px; }
  .page-title { font-size: 30px; }
}

/* ============================================================
   FOCUS STATES (a11y)
   ============================================================ */
button:focus-visible, input:focus-visible, a:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}
.page-title:focus { outline: none; }

/* Hidden helper */
[hidden] { display: none !important; }

/* ============================================================
   BUILTIN LOGIN FORM (auth.mode = 'builtin')
   ============================================================ */
.auth-login-form {
  display: flex;
  flex-direction: column;
  gap: 14px;
  margin-top: 22px;
}
.auth-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.auth-label {
  font-size: 13px;
  font-weight: 500;
  color: var(--fg-secondary);
}
.auth-field input {
  width: 100%;
  padding: 10px 12px;
  background: var(--bg-input);
  border: 1px solid var(--border-md);
  border-radius: var(--radius-md);
  font-size: 14px;
  color: var(--fg-primary);
  outline: 0;
  transition: border-color .12s, box-shadow .12s;
}
.auth-field input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 2px var(--accent-soft);
}
.auth-error {
  font-size: 13px;
  color: var(--danger);
  background: var(--danger-soft);
  padding: 8px 12px;
  border-radius: var(--radius-md);
}