/* Notebooks — single stylesheet, no build step. */

:root {
    --bg: #f6f4ef;
    --panel: #fbfaf7;
    --paper: #ffffff;
    --ink: #1f2420;
    --ink-2: #4a524c;
    --ink-3: #7b847d;
    --line: #e3e0d7;
    --line-2: #d4d0c4;
    --accent: #1d6b48;
    --accent-ink: #ffffff;
    --accent-soft: #e2efe7;
    --accent-line: #b9d6c5;
    --hover: #eeebe3;
    --select: #dcebe2;
    --mark: #ffe9a8;
    --danger: #b3261e;
    --danger-soft: #fbe9e7;
    --warn-soft: #fff4d6;
    --shadow: 0 1px 2px rgba(30, 30, 20, .06), 0 8px 24px rgba(30, 30, 20, .10);
    --radius: 8px;
    --font-ui: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    --font-title: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
    --font-mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
    color-scheme: light;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #161917;
        --panel: #1b1f1c;
        --paper: #202522;
        --ink: #e7ebe8;
        --ink-2: #b7c0ba;
        --ink-3: #87918a;
        --line: #2e3430;
        --line-2: #3a413c;
        --accent: #5fbf8d;
        --accent-ink: #0d1a13;
        --accent-soft: #1f3529;
        --accent-line: #2f5a43;
        --hover: #262c28;
        --select: #23392c;
        --mark: #6b5a18;
        --danger: #f2a39b;
        --danger-soft: #3a1f1c;
        --warn-soft: #3a3218;
        --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .45);
        color-scheme: dark;
    }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body {
    margin: 0;
    background: var(--bg);
    color: var(--ink);
    font: 14px/1.45 var(--font-ui);
    -webkit-font-smoothing: antialiased;
}
button, input, select, textarea { font: inherit; color: inherit; }
a { color: var(--accent); }
svg { flex: none; }
svg:not([width]):not([class]) { width: 1em; height: 1em; }
[hidden] { display: none !important; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

/* ---------- Buttons ---------- */
.btn {
    display: inline-flex; align-items: center; gap: 6px;
    padding: 6px 12px; border-radius: 6px; border: 1px solid var(--line-2);
    background: var(--paper); cursor: pointer; white-space: nowrap;
}
.btn:hover { background: var(--hover); }
.btn:focus-visible, .icon-btn:focus-visible, .tree-row:focus-visible, input:focus-visible, .files-zone:focus-visible {
    outline: 2px solid var(--accent); outline-offset: 1px;
}
.btn-primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); font-weight: 600; }
.btn-primary:hover { background: var(--accent); filter: brightness(1.08); }
.btn-primary:disabled { opacity: .5; cursor: default; filter: none; }
.btn-quiet { border-color: transparent; background: transparent; color: var(--ink-2); }
.btn-quiet:hover { background: var(--hover); }
.btn-danger { color: var(--danger); }
.btn-danger-solid { background: var(--danger); border-color: var(--danger); color: var(--paper); font-weight: 600; }
.btn-danger-solid:hover { background: var(--danger); filter: brightness(1.08); }
.btn-small { padding: 3px 8px; font-size: 12.5px; }
.btn svg { width: 15px; height: 15px; }
.icon-btn {
    display: inline-grid; place-items: center; width: 32px; height: 32px;
    border: 0; border-radius: 6px; background: transparent; cursor: pointer; color: var(--ink-2);
}
.icon-btn:hover { background: var(--hover); color: var(--ink); }
.icon-btn svg { width: 20px; height: 20px; }

/* ---------- Auth ---------- */
.auth-page { display: grid; place-items: center; padding: 24px 16px; }
.auth-card {
    width: min(380px, 100%); background: var(--paper); border: 1px solid var(--line);
    border-radius: 12px; padding: 32px 28px; box-shadow: var(--shadow);
}
.auth-brand { display: flex; align-items: center; gap: 10px; color: var(--accent); }
.auth-brand h1 { margin: 0; font: 600 24px/1.2 var(--font-title); color: var(--ink); }
.auth-brand .brand-mark { width: 30px; height: 30px; }
.auth-sub { color: var(--ink-3); margin: 6px 0 22px; }
.auth-form { display: grid; gap: 14px; }
.auth-form label { display: grid; gap: 5px; font-weight: 600; font-size: 13px; color: var(--ink-2); }
.auth-form input[type=email], .auth-form input[type=password], .auth-form input[type=text] {
    padding: 9px 11px; border: 1px solid var(--line-2); border-radius: 6px; background: var(--panel); font-weight: 400; color: var(--ink);
}
.auth-form .auth-check { display: flex; align-items: center; gap: 8px; font-weight: 400; }
.auth-form .btn { justify-content: center; padding: 9px; }
.auth-error { margin: 0; color: var(--danger); background: var(--danger-soft); padding: 8px 10px; border-radius: 6px; }
.auth-foot { margin: 18px 0 0; color: var(--ink-3); text-align: center; }

/* ---------- App frame ---------- */
.app-page { overflow: hidden; }
.app { display: flex; flex-direction: column; height: 100vh; height: 100dvh; }
.topbar {
    display: flex; align-items: center; gap: 14px; flex: none;
    height: 48px; padding: 0 12px 0 14px; border-bottom: 1px solid var(--line); background: var(--panel);
}
.brand { display: flex; align-items: center; gap: 8px; text-decoration: none; color: var(--ink); font: 600 17px var(--font-title); }
.brand-mark { width: 22px; height: 22px; color: var(--accent); }
.views { display: flex; gap: 2px; margin-left: 8px; }
.view-link { padding: 6px 12px; border-radius: 6px; color: var(--ink-2); text-decoration: none; font-weight: 500; }
.view-link:hover { background: var(--hover); color: var(--ink); }
.view-link.is-active { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.who { margin-left: auto; display: flex; align-items: center; gap: 6px; color: var(--ink-3); min-width: 0; }
.who-name { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.who form { margin: 0; }
.nav-toggle { display: none; }

.workspace { flex: 1; display: flex; min-height: 0; position: relative; }

/* ---------- Sidebar / tree ---------- */
.sidebar {
    flex: 0 0 auto;
    width: max-content;
    min-width: min(250px, 33vw);
    max-width: 33vw;            /* grows with its contents, never past a third of the window */
    display: flex; flex-direction: column;
    background: var(--panel); border-right: 1px solid var(--line);
    min-height: 0;
}
.sidebar-head { padding: 12px 12px 8px; display: grid; gap: 8px; border-bottom: 1px solid var(--line); }
.filter, .search-box { position: relative; display: flex; align-items: center; }
.filter-icon { position: absolute; left: 9px; width: 16px; height: 16px; color: var(--ink-3); pointer-events: none; }
.filter input, .search-box input {
    width: 100%; padding: 7px 28px 7px 31px; border: 1px solid var(--line-2); border-radius: 6px; background: var(--paper);
}
.filter input.is-regex { font-family: var(--font-mono); font-size: 13px; }
.filter input.is-invalid { border-color: var(--danger); }
.filter-clear {
    position: absolute; right: 4px; width: 22px; height: 22px; border: 0; border-radius: 4px;
    background: transparent; color: var(--ink-3); cursor: pointer; font-size: 18px; line-height: 1;
}
.filter-clear:hover { background: var(--hover); color: var(--ink); }
.filter-status { margin: -2px 2px 0; font-size: 12px; color: var(--ink-3); min-height: 0; }
.filter-status:empty { display: none; }
.filter-status.is-error { color: var(--danger); }
.btn-new { justify-content: center; color: var(--accent); border-color: var(--accent-line); background: var(--accent-soft); font-weight: 600; }
.btn-new:hover { background: var(--accent-soft); filter: brightness(.97); }

.tree-scroll { flex: 1; overflow: auto; padding: 6px 0 24px; min-height: 0; }
.tree, .tree ul { list-style: none; margin: 0; padding: 0; }
.tree { min-width: max-content; }   /* lets the scroller scroll sideways for deep trees */
.tree-row {
    display: flex; align-items: center; gap: 4px;
    height: 30px; padding-right: 14px; cursor: pointer; white-space: nowrap;
    border-radius: 0; color: var(--ink-2); user-select: none; position: relative;
}
.tree-row:hover { background: var(--hover); color: var(--ink); }
.tree-row.is-selected { background: var(--select); color: var(--ink); }
.tree-row.is-selected::before { content: ""; position: absolute; left: 0; top: 4px; bottom: 4px; width: 3px; border-radius: 0 3px 3px 0; background: var(--accent); }
.tree-row.is-context { box-shadow: inset 0 0 0 1px var(--accent-line); }
.tree-row.is-dim { opacity: .55; }
.tree-row.is-match .tree-label { background: var(--mark); border-radius: 3px; padding: 0 3px; margin: 0 -3px; color: var(--ink); }
.tree-row.is-drop-target { background: var(--accent-soft); box-shadow: inset 0 0 0 2px var(--accent); }
.tree-row.is-dragging { opacity: .4; }
.tree-caret {
    display: inline-grid; place-items: center; width: 20px; height: 20px; border: 0; padding: 0;
    background: transparent; color: var(--ink-3); border-radius: 4px; cursor: pointer;
}
.tree-caret:hover { background: var(--line); color: var(--ink); }
.tree-caret svg { width: 12px; height: 12px; transition: transform .12s ease; }
.tree-caret.is-open svg { transform: rotate(90deg); }
.tree-caret.is-leaf { visibility: hidden; }
.tree-icon { width: 16px; height: 16px; color: var(--ink-3); }
.tree-row.is-top { height: 34px; color: var(--ink); }
.tree-row.is-top .tree-label { font-weight: 700; }
.tree-row.is-top .tree-icon { width: 18px; height: 18px; color: var(--accent); }
.tree-label { padding: 0 2px; }
.tree-count { margin-left: 6px; font-size: 11px; color: var(--ink-3); background: var(--hover); border-radius: 8px; padding: 0 6px; }
.tree-rename {
    font: inherit; padding: 1px 5px; border: 1px solid var(--accent); border-radius: 4px; background: var(--paper);
    min-width: 160px;
}
.tree-empty { padding: 20px 16px; color: var(--ink-3); text-align: center; white-space: normal; }
.tree-empty .btn { margin-top: 10px; }

/* ---------- Main ---------- */
.main { flex: 1; min-width: 0; display: flex; flex-direction: column; background: var(--paper); }
.view { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.editor-empty { margin: auto; text-align: center; color: var(--ink-3); padding: 24px; }
.editor-empty svg { width: 64px; height: 64px; opacity: .6; }

.editor { flex: 1; min-height: 0; display: flex; flex-direction: column; }
.editor-head { padding: 18px 28px 10px; border-bottom: 1px solid var(--line); }
.crumbs { display: flex; flex-wrap: wrap; gap: 4px; font-size: 12.5px; color: var(--ink-3); margin-bottom: 4px; }
.crumbs a { color: var(--ink-3); text-decoration: none; }
.crumbs a:hover { color: var(--accent); text-decoration: underline; }
.crumbs .sep { opacity: .6; }
.title-input {
    width: 100%; border: 0; background: transparent; padding: 2px 0; margin: 0;
    font: 600 26px/1.25 var(--font-title); color: var(--ink);
}
.title-input:focus { outline: none; box-shadow: 0 2px 0 var(--accent-line); }
.meta { display: flex; flex-wrap: wrap; align-items: center; gap: 4px 14px; margin-top: 6px; font-size: 12.5px; color: var(--ink-3); }
.meta b { font-weight: 600; color: var(--ink-2); }
.badge { display: inline-block; padding: 1px 7px; border-radius: 10px; background: var(--hover); color: var(--ink-2); font-size: 11.5px; font-weight: 600; }
.save-state { margin-left: auto; display: inline-flex; align-items: center; gap: 6px; }
.save-state::before { content: ""; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
.save-state.is-dirty::before { background: #d4a017; }
.save-state.is-saving::before { background: #d4a017; animation: pulse 1s infinite; }
.save-state.is-error::before { background: var(--danger); }
.save-state.is-error { color: var(--danger); }
@keyframes pulse { 50% { opacity: .3; } }

.conflict {
    display: flex; flex-wrap: wrap; align-items: center; gap: 8px 12px;
    margin: 0; padding: 10px 28px; background: var(--warn-soft); border-bottom: 1px solid var(--line);
}
.conflict p { margin: 0; flex: 1 1 260px; }

.toolbar {
    display: flex; flex-wrap: wrap; gap: 2px; padding: 6px 22px; border-bottom: 1px solid var(--line); background: var(--panel);
}
.toolbar button {
    min-width: 30px; height: 30px; padding: 0 7px; border: 0; border-radius: 5px; background: transparent;
    color: var(--ink-2); cursor: pointer; font-size: 13.5px;
}
.toolbar button:hover { background: var(--hover); color: var(--ink); }
.toolbar button.is-on { background: var(--select); color: var(--ink); }
.toolbar .sep { width: 1px; margin: 5px 4px; background: var(--line-2); }

.note-scroll { flex: 1; min-height: 120px; overflow: auto; }
.note-body {
    min-height: 100%; padding: 22px 28px 60px; outline: none;
    font-size: 15.5px; line-height: 1.65; max-width: 860px;
    overflow-wrap: anywhere;
}
.note-body:empty::before { content: attr(data-placeholder); color: var(--ink-3); }
.note-body img { max-width: 100%; height: auto; border-radius: 4px; }
.note-body blockquote { margin: 1em 0; padding: 2px 16px; border-left: 3px solid var(--accent-line); color: var(--ink-2); }
.note-body pre, .note-body code { font-family: var(--font-mono); font-size: 13.5px; background: var(--hover); border-radius: 4px; }
.note-body pre { padding: 10px 12px; overflow: auto; }
.note-body code { padding: 1px 4px; }
.note-body table { border-collapse: collapse; }
.note-body td, .note-body th { border: 1px solid var(--line-2); padding: 4px 8px; }
.note-body h1, .note-body h2, .note-body h3 { font-family: var(--font-title); line-height: 1.25; }

/* ---------- Files footer ---------- */
.files { flex: none; border-top: 1px solid var(--line); background: var(--panel); max-height: 40%; display: flex; flex-direction: column; }
.files-head { display: flex; align-items: center; gap: 10px; padding: 8px 22px 6px; }
.files-head h2 { margin: 0; font-size: 13px; text-transform: uppercase; letter-spacing: .06em; color: var(--ink-3); }
.files-head .spacer { flex: 1; }
.files-body { overflow: auto; padding: 0 22px 12px; }
.files-zone {
    display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 6px 10px;
    padding: 12px; border: 1.5px dashed var(--line-2); border-radius: var(--radius);
    color: var(--ink-3); text-align: center; cursor: default; transition: background .1s, border-color .1s;
}
.files-zone:focus { border-color: var(--accent); background: var(--accent-soft); color: var(--ink-2); }
.files-zone.is-over { border-color: var(--accent); background: var(--accent-soft); color: var(--accent); }
.files-zone kbd { font-family: var(--font-mono); font-size: 11.5px; padding: 1px 5px; border: 1px solid var(--line-2); border-radius: 4px; background: var(--paper); }
.file-list { list-style: none; margin: 8px 0 0; padding: 0; display: grid; gap: 4px; }
.file {
    display: grid; grid-template-columns: 30px minmax(0, 1fr) auto; align-items: center; gap: 4px 10px;
    padding: 6px 8px; border-radius: 6px; background: var(--paper); border: 1px solid var(--line);
}
.file.is-deleted { opacity: .65; }
.file.is-deleted .file-name { text-decoration: line-through; }
.file-icon { width: 28px; height: 28px; display: grid; place-items: center; border-radius: 5px; background: var(--hover); color: var(--ink-3); font-size: 9.5px; font-weight: 700; text-transform: uppercase; overflow: hidden; }
.file-main { min-width: 0; }
.file-name { display: block; font-weight: 600; color: var(--ink); text-decoration: none; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
a.file-name:hover { color: var(--accent); text-decoration: underline; }
.file-meta { font-size: 12px; color: var(--ink-3); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.file-actions { display: flex; gap: 2px; }
.file-versions { grid-column: 2 / -1; margin: 2px 0 0; padding: 6px 0 0 0; border-top: 1px dashed var(--line); list-style: none; font-size: 12px; }
.file-versions li { display: flex; gap: 10px; padding: 2px 0; color: var(--ink-3); }
.file-versions a { color: var(--accent); }
.version-btn { border: 0; background: var(--hover); color: var(--ink-2); font-size: 11px; font-weight: 700; border-radius: 9px; padding: 0 7px; cursor: pointer; margin-left: 4px; }
.version-btn:hover { background: var(--select); }
.upload-row { display: grid; grid-template-columns: minmax(0, 1fr) 120px; gap: 10px; align-items: center; font-size: 12.5px; color: var(--ink-2); padding: 4px 8px; }
.upload-row progress { width: 100%; height: 6px; accent-color: var(--accent); }
.upload-row.is-error { color: var(--danger); }

/* ---------- Search view ---------- */
.view-search { overflow: auto; }
.search-head { padding: 24px 28px 8px; max-width: 900px; width: 100%; }
.search-head h1 { margin: 0 0 12px; font: 600 26px var(--font-title); }
.search-box input { padding: 10px 12px 10px 34px; font-size: 15px; }
.search-hint { font-size: 12.5px; color: var(--ink-3); margin: 8px 2px 0; }
.search-hint code { font-family: var(--font-mono); background: var(--hover); padding: 0 4px; border-radius: 3px; }
.search-status { margin: 10px 2px 0; font-size: 13px; color: var(--ink-2); }
.search-status.is-error { color: var(--danger); }
.results { list-style: none; margin: 0; padding: 6px 28px 40px; max-width: 900px; width: 100%; display: grid; gap: 10px; }
.result {
    display: block; width: 100%; text-align: left; padding: 12px 14px; border: 1px solid var(--line);
    border-radius: var(--radius); background: var(--paper); cursor: pointer;
}
.result:hover, .result:focus-visible { border-color: var(--accent-line); background: var(--panel); outline: none; box-shadow: 0 0 0 2px var(--accent-soft); }
.result-top { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.result-title { font: 600 16.5px var(--font-title); color: var(--ink); }
.result-path { font-size: 12px; color: var(--ink-3); margin-top: 2px; }
.result-preview { margin: 6px 0; color: var(--ink-2); font-size: 13.5px; line-height: 1.5; overflow-wrap: anywhere; }
.result-preview mark, .result-title mark { background: var(--mark); color: inherit; border-radius: 2px; padding: 0 1px; }
.result-meta { display: flex; flex-wrap: wrap; gap: 4px 14px; font-size: 12px; color: var(--ink-3); }

/* ---------- Context menu, dialog, toasts ---------- */
.context-menu {
    position: fixed; z-index: 50; min-width: 210px; margin: 0; padding: 5px; list-style: none;
    background: var(--paper); border: 1px solid var(--line-2); border-radius: var(--radius); box-shadow: var(--shadow);
}
.context-menu li[role=separator] { height: 1px; background: var(--line); margin: 4px 2px; }
.context-menu button {
    display: flex; align-items: center; gap: 10px; width: 100%; padding: 7px 10px; border: 0; border-radius: 5px;
    background: transparent; cursor: pointer; text-align: left;
}
.context-menu button:hover, .context-menu button:focus { background: var(--hover); outline: none; }
.context-menu button:disabled { opacity: .4; cursor: default; background: transparent; }
.context-menu button.is-danger { color: var(--danger); }
.context-menu svg { width: 16px; height: 16px; color: var(--ink-3); }
.context-menu .is-danger svg { color: var(--danger); }

.dialog { border: 1px solid var(--line-2); border-radius: 12px; padding: 0; width: min(460px, calc(100vw - 32px)); background: var(--paper); color: var(--ink); box-shadow: var(--shadow); }
.dialog::backdrop { background: rgba(20, 24, 21, .35); }
.dialog-body { padding: 20px; display: grid; gap: 10px; margin: 0; }
.dialog h2 { margin: 0; font: 600 19px var(--font-title); overflow-wrap: anywhere; }
.dialog-sub { margin: -4px 0 0; color: var(--ink-3); }
.dialog-filter { padding: 7px 10px; border: 1px solid var(--line-2); border-radius: 6px; background: var(--panel); }
.move-list { list-style: none; margin: 0; padding: 4px; max-height: 50vh; overflow: auto; border: 1px solid var(--line); border-radius: 6px; }
.move-list li { padding: 5px 8px; border-radius: 4px; cursor: pointer; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.move-list li:hover { background: var(--hover); }
.move-list li[aria-selected=true] { background: var(--select); font-weight: 600; }
.move-list li.is-top { font-weight: 700; }
.move-list li.is-disabled { opacity: .4; cursor: not-allowed; background: none; }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; margin-top: 4px; }

.toasts { position: fixed; right: 16px; bottom: 16px; z-index: 60; display: grid; gap: 8px; max-width: min(380px, calc(100vw - 32px)); }
.toast { padding: 10px 14px; border-radius: var(--radius); background: var(--ink); color: var(--bg); box-shadow: var(--shadow); font-size: 13.5px; }
.toast.is-error { background: var(--danger); color: #fff; }
.toast button { margin-left: 8px; color: inherit; background: transparent; border: 1px solid currentColor; border-radius: 4px; cursor: pointer; padding: 1px 8px; }

/* ---------- Narrow screens ---------- */
@media (max-width: 760px) {
    .nav-toggle { display: inline-grid; }
    .brand span, .who-name { display: none; }
    .views { margin-left: 0; }
    .sidebar {
        position: absolute; z-index: 30; top: 0; bottom: 0; left: 0;
        width: max-content; min-width: min(280px, 85vw); max-width: 85vw;
        transform: translateX(-102%); transition: transform .18s ease; box-shadow: var(--shadow);
    }
    .app.is-nav-open .sidebar { transform: none; }
    .scrim { position: absolute; inset: 0; z-index: 20; background: rgba(20, 24, 21, .3); }
    .editor-head, .conflict { padding-left: 16px; padding-right: 16px; }
    .toolbar { padding: 6px 10px; }
    .note-body { padding: 16px 16px 48px; }
    .files-head, .files-body { padding-left: 12px; padding-right: 12px; }
    .title-input { font-size: 22px; }
    .search-head { padding: 18px 16px 6px; }
    .results { padding: 6px 16px 32px; }
    .file { grid-template-columns: 26px minmax(0, 1fr); }
    .file-actions { grid-column: 2; }
}