:root {
  --radius: 10px;
  --shadow: 0 1px 3px rgba(16, 24, 40, 0.08);
  --code-bg: #1e293b;
  --code-fg: #e2e8f0;
  --secondary: #8b5cf6;
}

/* ── Dark (default) ──────────────────────────────────── */
html, [data-theme="dark"] {
  --bg: #1a1b1e; --surface: #26272b; --border: #3a3b40;
  --text: #e4e4e7; --muted: #9ca3af;
  --primary: #7dd3fc; --primary-bg: #0c4a6e; --primary-dark: #075985; --on-primary: #7dd3fc;
  --secondary: #f59e0b;
  --danger: #f87171; --input-bg: #1a1b1e; --bg-hover: #2b2c31;
}

/* ── Light ───────────────────────────────────────────── */
[data-theme="light"] {
  --bg: #f5f7fb; --surface: #ffffff; --border: #e4e8f0;
  --text: #1b2430; --muted: #6b7688;
  --primary: #3b82f6; --primary-bg: #3b82f6; --primary-dark: #2563eb; --on-primary: #ffffff;
  --secondary: #8b5cf6;
  --danger: #ef4444; --input-bg: #ffffff; --bg-hover: #f3f5f9;
}

/* ── Summer ──────────────────────────────────────────── */
[data-theme="summer"] {
  --bg: #fff8f0; --surface: #fff0e0; --border: #ffd0a0;
  --text: #4a3528; --muted: #9a8070;
  --primary: #f08040; --primary-bg: #e06830; --primary-dark: #c05020; --on-primary: #fff8f0;
  --secondary: #14b8a6;
  --danger: #c04030; --input-bg: #ffffff; --bg-hover: #ffe0c0;
}

/* ── Max Summer ───────────────────────────────────────── */
[data-theme="max-summer"] {
  --bg: #fffdf5; --surface: #fff9e8; --border: #ffe082;
  --text: #212121; --muted: #757575;
  --primary: #e53935; --primary-bg: #d32f2f; --primary-dark: #b71c1c; --on-primary: #fffdf5;
  --secondary: #f59e0b;
  --danger: #c62828; --input-bg: #fffefa; --bg-hover: #fff3c8;
}

/* ── Autumn ──────────────────────────────────────────── */
[data-theme="autumn"] {
  --bg: #f4f1ec; --surface: #eae5de; --border: #d4c8bc;
  --text: #3d3228; --muted: #8a7a6a;
  --primary: #d59b6a; --primary-bg: #d59b6a; --primary-dark: #c0834a; --on-primary: #f4f1ec;
  --secondary: #7a9e6e;
  --danger: #c04040; --input-bg: #ffffff; --bg-hover: #e0d8ce;
}

/* ── Dracula ─────────────────────────────────────────── */
[data-theme="dracula"] {
  --bg: #0c0c1e; --surface: #12122a; --border: #222;
  --text: #eee; --muted: #aaa;
  --primary: #7c6af7; --primary-bg: #4a3a9a; --primary-dark: #6a5aba; --on-primary: #eee;
  --secondary: #ff79c6;
  --danger: #f87272; --input-bg: #1a1a3a; --bg-hover: #2a2a4e;
}

/* ── Nord ────────────────────────────────────────────── */
[data-theme="nord"] {
  --bg: #2e3440; --surface: #3b4252; --border: #4c566a;
  --text: #eceff4; --muted: #b0b9ca;
  --primary: #88c0d0; --primary-bg: #5e81ac; --primary-dark: #81a1c1; --on-primary: #eceff4;
  --secondary: #d08770;
  --danger: #bf616a; --input-bg: #3b4252; --bg-hover: #434c5e;
}

/* ── Tokyo Night ─────────────────────────────────────── */
[data-theme="tokyo-night"] {
  --bg: #1a1b26; --surface: #1f2335; --border: #2f3549;
  --text: #c0caf5; --muted: #787c99;
  --primary: #7aa2f7; --primary-bg: #3d59a1; --primary-dark: #5470b8; --on-primary: #a9b1d6;
  --secondary: #e0af68;
  --danger: #f7768e; --input-bg: #1f2335; --bg-hover: #292e42;
}

/* ── Catppuccin ──────────────────────────────────────── */
[data-theme="catppuccin"] {
  --bg: #1e1e2e; --surface: #26263a; --border: #313150;
  --text: #cdd6f4; --muted: #9399b2;
  --primary: #cba6f7; --primary-bg: #7350a0; --primary-dark: #8b6bc0; --on-primary: #cdd6f4;
  --secondary: #94e2d5;
  --danger: #f38ba8; --input-bg: #26263a; --bg-hover: #313150;
}

/* ── One Dark ────────────────────────────────────────── */
[data-theme="one-dark"] {
  --bg: #21252b; --surface: #282c34; --border: #333842;
  --text: #dcdfe4; --muted: #9196a0;
  --primary: #61afef; --primary-bg: #2b5780; --primary-dark: #3a6ea0; --on-primary: #61afef;
  --secondary: #98c379;
  --danger: #e06c75; --input-bg: #282c34; --bg-hover: #333842;
}

/* ── Sunset ──────────────────────────────────────────── */
[data-theme="sunset"] {
  --bg: #1c1018; --surface: #251420; --border: #352030;
  --text: #fce7f3; --muted: #b090a0;
  --primary: #f472b6; --primary-bg: #831843; --primary-dark: #9d174d; --on-primary: #f9a8d4;
  --secondary: #fb923c;
  --danger: #f87171; --input-bg: #251420; --bg-hover: #352030;
}

/* ── Urban Slate ─────────────────────────────────────── */
[data-theme="urban-slate"] {
  --bg: #eef0f3; --surface: #ffffff; --border: #d4d8de;
  --text: #2b3038; --muted: #6b7480;
  --primary: #4a6a8a; --primary-bg: #3d5a75; --primary-dark: #2f4a60; --on-primary: #ffffff;
  --secondary: #c68a3c;
  --danger: #c0392b; --input-bg: #ffffff; --bg-hover: #e2e6ec;
}

/* ── Frozen Mist ─────────────────────────────────────── */
[data-theme="frozen-mist"] {
  --bg: #eef0f2; --surface: #fcfcfd; --border: #dfe3e8;
  --text: #33383e; --muted: #828a94;
  --primary: #c96f3a; --primary-bg: #b85f2e; --primary-dark: #9c4f24; --on-primary: #ffffff;
  --secondary: #4a8a96;
  --danger: #c0392b; --input-bg: #ffffff; --bg-hover: #e3e7ec;
}

/* ── Yacht ───────────────────────────────────────────── */
[data-theme="yacht"] {
  --bg: #e9edf2; --surface: #ffffff; --border: #ccd4de;
  --text: #26303c; --muted: #6d7986;
  --primary: #33517a; --primary-bg: #2a4466; --primary-dark: #1f3550; --on-primary: #ffffff;
  --secondary: #b06a3c;
  --danger: #b24436; --input-bg: #ffffff; --bg-hover: #dde3ea;
}

/* ── Copper ──────────────────────────────────────────── */
[data-theme="copper"] {
  --bg: #f3ede6; --surface: #fdfaf5; --border: #e0d3c2;
  --text: #3a2f26; --muted: #8c7f70;
  --primary: #b5653b; --primary-bg: #a5552f; --primary-dark: #8a4625; --on-primary: #ffffff;
  --secondary: #3b9a9c;
  --danger: #c0392b; --input-bg: #ffffff; --bg-hover: #e9dfd2;
}

/* ── Marina ──────────────────────────────────────────── */
[data-theme="marina"] {
  --bg: #eaf0f4; --surface: #ffffff; --border: #d2dde5;
  --text: #24303c; --muted: #6f7f8c;
  --primary: #1f4e6e; --primary-bg: #1a425c; --primary-dark: #12344a; --on-primary: #ffffff;
  --secondary: #4a97a6;
  --danger: #b2432f; --input-bg: #ffffff; --bg-hover: #dee7ee;
}

/* ── Neptune ─────────────────────────────────────────── */
[data-theme="neptune"] {
  --bg: #e7f1f4; --surface: #ffffff; --border: #cde0e6;
  --text: #1f2f36; --muted: #6d838c;
  --primary: #2f7fa0; --primary-bg: #276f8e; --primary-dark: #1e5c77; --on-primary: #ffffff;
  --secondary: #d98a4a;
  --danger: #c0392b; --input-bg: #ffffff; --bg-hover: #d9e8ec;
}

/* ── Sapphire ────────────────────────────────────────── */
[data-theme="sapphire"] {
  --bg: #eef0f6; --surface: #ffffff; --border: #dcdde8;
  --text: #2d3440; --muted: #787f8e;
  --primary: #5a73a6; --primary-bg: #4d6395; --primary-dark: #3d5078; --on-primary: #ffffff;
  --secondary: #c06a52;
  --danger: #c0553d; --input-bg: #ffffff; --bg-hover: #e2e4ee;
}

/* ── Tropical ────────────────────────────────────────── */
[data-theme="tropical"] {
  --bg: #f2efe6; --surface: #fdfaf2; --border: #e0d9c2;
  --text: #28302e; --muted: #7d8680;
  --primary: #e76f51; --primary-bg: #d95f41; --primary-dark: #c04e33; --on-primary: #ffffff;
  --secondary: #32a09c;
  --danger: #c0392b; --input-bg: #ffffff; --bg-hover: #e9e4d4;
}

/* ── Gossamer ────────────────────────────────────────── */
[data-theme="gossamer"] {
  --bg: #eceef1; --surface: #ffffff; --border: #d8dce2;
  --text: #2c3238; --muted: #77808a;
  --primary: #3aa6a0; --primary-bg: #2f918b; --primary-dark: #257771; --on-primary: #ffffff;
  --secondary: #d0783c;
  --danger: #d0563a; --input-bg: #ffffff; --bg-hover: #e0e4e9;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.5;
  transition: background 0.2s, color 0.2s;
}

.muted { color: var(--muted); }

.topbar {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 12px 20px;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 10;
}

.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; font-size: 18px; }
.brand-logo { height: 65px; width: auto; object-fit: contain; }

.search {
  flex: 1;
  max-width: 520px;
  padding: 9px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 14px;
  background: var(--input-bg);
  color: var(--text);
}
.search:focus { outline: 2px solid var(--primary); background: var(--input-bg); }

.topbar-right { display: flex; align-items: center; gap: 10px; margin-left: auto; }
.user-select { padding: 8px 10px; border: 1px solid var(--border); border-radius: 8px; background: var(--input-bg); color: var(--text); }

.btn {
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
}
.btn:hover { background: var(--bg-hover); }
.btn.primary { background: var(--primary-bg); border-color: var(--primary-bg); color: var(--on-primary); }
.btn.primary:hover { background: var(--primary-dark); border-color: var(--primary-dark); }
.btn.danger { color: var(--danger); border-color: var(--danger); }
.btn.ghost { background: transparent; border-color: transparent; }

.layout {
  display: grid;
  grid-template-columns: 1fr 300px;
  gap: 20px;
  max-width: 1080px;
  margin: 20px auto;
  padding: 0 20px;
}

.col-main h2 { margin-top: 0; font-size: 20px; }
.col-side { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; height: fit-content; }
.col-side h3 { margin-top: 0; }

.note-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 8px; }
.note-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  cursor: pointer;
  box-shadow: var(--shadow);
}
.note-item:hover { border-color: var(--primary); }
.note-title { font-weight: 600; color: var(--secondary); }
.note-meta { color: var(--muted); font-size: 12px; margin-top: 2px; }
.note-tags { color: var(--primary); font-size: 12px; margin-top: 4px; }
.note-snippet { color: var(--text); font-size: 13px; line-height: 1.45; margin-top: 6px; overflow: hidden; }
.note-snippet p { margin: 0 0 0.3em; }
.note-snippet p:last-child { margin-bottom: 0; }
.note-snippet ul, .note-snippet ol { margin: 0.2em 0; padding-left: 1.4em; }
.note-snippet code { background: var(--code-bg); color: var(--code-fg); padding: 1px 4px; border-radius: 4px; font-size: 0.9em; }
.note-snippet a { color: var(--secondary); text-decoration: underline; }
.note-snippet img { max-width: 40px; max-height: 40px; object-fit: cover; border-radius: 4px; vertical-align: middle; }
.note-snippet h1, .note-snippet h2, .note-snippet h3 { margin: 0.3em 0; font-size: 1em; color: var(--secondary); }
.note-snippet blockquote { border-left: 3px solid var(--secondary); margin: 0.3em 0; padding-left: 10px; color: var(--muted); }

.note-item { display: flex; align-items: flex-start; gap: 12px; }
.note-body { flex: 1; min-width: 0; }
.note-thumb {
  width: 56px;
  height: 56px;
  object-fit: cover;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--surface);
  flex-shrink: 0;
}
.attach-count { color: var(--muted); margin-left: 8px; }

.note-common { border-left: 3px solid var(--secondary); }.common-badge {
  display: inline-block;
  background: color-mix(in srgb, var(--secondary) 18%, transparent);
  color: var(--secondary);
  border-radius: 10px;
  padding: 0 7px;
  font-size: 11px;
  margin-right: 2px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .04em;
}

.common-toggle { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); cursor: pointer; }
.common-toggle input { accent-color: var(--secondary); cursor: pointer; }

.tag-cloud { display: flex; flex-wrap: wrap; gap: 6px; }
.tag-chip {
  background: color-mix(in srgb, var(--primary) 12%, transparent);
  color: var(--primary);
  border: none;
  border-radius: 16px;
  padding: 4px 12px;
  font-size: 13px;
  cursor: pointer;
}
.tag-chip:hover { background: color-mix(in srgb, var(--primary) 22%, transparent); }

.editor-wrap { max-width: 900px; margin: 20px auto; padding: 0 20px; }
.editor-topbar { display: flex; align-items: center; gap: 8px; margin-bottom: 10px; }
.spacer { flex: 1; }
.toolbar { display: flex; flex-wrap: wrap; gap: 4px; padding: 8px; background: var(--surface); border: 1px solid var(--border); border-bottom: none; border-radius: var(--radius) var(--radius) 0 0; }
.tool-btn { padding: 6px 10px; border: none; background: transparent; border-radius: 6px; cursor: pointer; font-size: 13px; color: var(--text); }
.tool-btn:hover { background: var(--bg-hover); }
.sep { width: 1px; background: var(--border); margin: 4px 6px; }

.editor {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 0 0 var(--radius) var(--radius);
  padding: 16px 20px;
  min-height: 60vh;
}
.editor .ProseMirror { min-height: 55vh; outline: none; }
.editor h1, .editor h2, .editor h3 { margin: 0.5em 0 0.25em; color: var(--secondary); }
.editor p { margin: 0.4em 0; }
.editor pre { background: var(--code-bg); color: var(--code-fg); padding: 12px; border-radius: 8px; overflow-x: auto; }
.editor code { background: color-mix(in srgb, var(--border) 55%, transparent); padding: 1px 4px; border-radius: 4px; font-size: 0.9em; }
.editor pre code { background: none; padding: 0; }
.editor blockquote { border-left: 3px solid var(--secondary); margin: 0.5em 0; padding-left: 12px; color: var(--muted); }
.editor a { color: var(--secondary); text-decoration: underline; cursor: pointer; }
.editor img { max-width: 100%; }

.editor-split {
  display: grid;
  grid-template-columns: 1fr 1fr;
  border: 1px solid var(--border);
  border-top: none;
  border-radius: 0 0 var(--radius) var(--radius);
  overflow: hidden;
}
.editor-split .editor {
  border: none;
  border-right: 1px solid var(--border);
  border-radius: 0;
}
.editor-split .preview {
  background: var(--surface);
  padding: 16px 20px;
  min-height: 60vh;
  overflow-y: auto;
  line-height: 1.6;
}
.editor-split.preview-hidden { grid-template-columns: 1fr; }
.editor-split.preview-hidden .preview { display: none; }
.editor-split.preview-hidden .editor { border-right: none; }
.preview-toggle.active { color: var(--primary); }

.preview h1, .preview h2, .preview h3, .preview h4 { margin: 0.5em 0 0.25em; color: var(--secondary); }
.preview h1 { font-size: 1.6em; }
.preview h2 { font-size: 1.35em; }
.preview h3 { font-size: 1.15em; }
.preview p { margin: 0.4em 0; }
.preview ul, .preview ol { padding-left: 1.5em; margin: 0.4em 0; }
.preview pre { background: var(--code-bg); color: var(--code-fg); padding: 12px; border-radius: 8px; overflow-x: auto; }
.preview code { background: color-mix(in srgb, var(--border) 55%, transparent); padding: 1px 4px; border-radius: 4px; font-size: 0.9em; }
.preview pre code { background: none; padding: 0; }
.preview blockquote { border-left: 3px solid var(--secondary); margin: 0.5em 0; padding-left: 12px; color: var(--muted); }
.preview a { color: var(--secondary); text-decoration: underline; }
.preview hr { border: none; border-top: 1px solid var(--border); margin: 1em 0; }
.preview img { max-width: 100%; }
.preview table { border-collapse: collapse; }
.preview th, .preview td { border: 1px solid var(--border); padding: 4px 8px; }

.status { margin-top: 10px; color: var(--muted); font-size: 13px; min-height: 20px; }
.editor-hint { margin-top: 12px; padding: 10px 14px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); font-size: 13px; color: var(--muted); line-height: 1.6; }
.editor-hint p { margin: 0.25em 0; }
.editor-hint code { background: color-mix(in srgb, var(--border) 55%, transparent); padding: 1px 4px; border-radius: 4px; font-size: 0.9em; }

.help-card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px 24px; line-height: 1.6; }
.help-card h1 { margin-top: 0; }
.help-card h2 { margin-top: 1.5em; margin-bottom: 0.4em; font-size: 18px; color: var(--secondary); }
.help-card p { margin: 0.4em 0; color: var(--text); }
.help-card code { background: color-mix(in srgb, var(--border) 55%, transparent); padding: 1px 4px; border-radius: 4px; font-size: 0.9em; }
.help-table { border-collapse: collapse; width: 100%; max-width: 480px; margin-top: 8px; }
.help-table th, .help-table td { text-align: left; padding: 6px 12px; border: 1px solid var(--border); font-size: 14px; }
.help-table th { background: var(--bg); color: var(--muted); font-weight: 600; }
.help-table code { white-space: nowrap; }

.tools-row { display: flex; align-items: center; gap: 12px; margin-top: 8px; flex-wrap: wrap; }
.tools-row .muted { min-height: 1.2em; }

.tools-head { display: flex; align-items: center; gap: 12px; margin-bottom: 8px; }
.tools-head h1 { margin: 0; }
.tools-logo { height: 40px; width: auto; }

.login-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 340px;
  margin: 10vh auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  text-align: center;
}
.login-logo { width: 56px; height: 56px; border-radius: 12px; margin: 0 auto; object-fit: cover; }
.login-card input { padding: 10px 14px; border: 1px solid var(--border); border-radius: 8px; background: var(--input-bg); color: var(--text); }
.error { color: var(--danger); font-size: 13px; min-height: 18px; }

.overlay { position: fixed; inset: 0; background: rgba(15, 23, 42, 0.4); display: flex; align-items: center; justify-content: center; z-index: 100; }
.modal { background: var(--surface); border-radius: var(--radius); padding: 20px; width: 90%; max-width: 520px; max-height: 80vh; overflow-y: auto; }
.history-list { list-style: none; padding: 0; margin: 0 0 16px; }
.history-list li { padding: 8px 0; border-bottom: 1px solid var(--border); font-size: 13px; }

/* ── Theme selector ──────────────────────────────────── */
.theme-selector { position: relative; }
.theme-btn {
  display: flex; align-items: center; gap: 6px;
  padding: 6px 12px; border: 1px solid var(--border); border-radius: 8px;
  background: var(--surface); color: var(--text);
  font-size: 13px; font-family: inherit; cursor: pointer;
  transition: background 0.15s;
}
.theme-btn:hover { background: var(--bg-hover); }
.theme-label { color: var(--muted); }
.chevron { font-size: 9px; color: var(--muted); }
.theme-popover {
  position: absolute; top: calc(100% + 6px); right: 0;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.25);
  padding: 10px; min-width: 200px; z-index: 60;
}
.theme-pop-header {
  font-size: 11px; color: var(--muted);
  text-transform: uppercase; letter-spacing: 0.6px;
  margin-bottom: 8px; padding: 0 4px;
}
.theme-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 4px; }
.theme-section {
  grid-column: 1 / -1;
  font-size: 11px; color: var(--muted);
  text-transform: uppercase; letter-spacing: 0.6px;
  margin: 6px 4px 2px; padding-top: 6px;
  border-top: 1px solid var(--border);
}
.theme-section:first-child { border-top: none; padding-top: 0; margin-top: 0; }
.theme-option {
  display: flex; align-items: center; gap: 8px;
  padding: 7px 8px; border: 1px solid transparent; border-radius: 6px;
  background: var(--bg); cursor: pointer; font-family: inherit;
  font-size: 13px; color: var(--text);
  transition: background 0.12s, border-color 0.12s;
}
.theme-option:hover { border-color: var(--border); }
.theme-option.active { border-color: var(--primary); }
.theme-swatch { display: flex; gap: 2px; flex-shrink: 0; }
.theme-dot { width: 10px; height: 10px; border-radius: 2px; }
.mode-row {
  display: flex; gap: 4px; margin-bottom: 8px;
  background: var(--bg); padding: 3px; border-radius: 8px;
  border: 1px solid var(--border);
}
.mode-btn {
  flex: 1; padding: 5px 0; border: none; border-radius: 6px;
  background: transparent; color: var(--muted);
  font-family: inherit; font-size: 12px; cursor: pointer;
  transition: background 0.12s, color 0.12s;
}
.mode-btn.active { background: var(--primary-bg); color: var(--on-primary); font-weight: 600; }
.auto-panel { display: flex; flex-direction: column; gap: 6px; }
.auto-label { font-size: 11px; color: var(--muted); text-transform: uppercase; letter-spacing: .6px; }
.auto-panel select {
  width: 100%; padding: 6px 8px; border: 1px solid var(--border); border-radius: 6px;
  background: var(--input-bg); color: var(--text); font-family: inherit; font-size: 13px;
}
.hidden { display: none !important; }

@media (max-width: 720px) {
  .layout { grid-template-columns: 1fr; }
  .topbar { flex-wrap: wrap; }
  .search { max-width: none; order: 3; flex-basis: 100%; }
  .theme-popover { right: -60px; }
}