:root {
  --bg: oklch(97% 0 0); --surface: #fff;
  --text: oklch(18% 0 0); --text-muted: oklch(45% 0 0);
  --border: oklch(88% 0 0);
  --ilf: oklch(60% 0.18 250); --eif: oklch(55% 0.16 180);
  --ei:  oklch(60% 0.20 55);  --eo: oklch(55% 0.20 320);
  --eq:  oklch(55% 0.15 100); --accent: oklch(50% 0.18 250);
  --radius: 6px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg); color: var(--text); min-height: 100vh; display: flex; flex-direction: column;
}

/* Top bar */
.topbar {
  display: flex; align-items: center; gap: 16px; padding: 8px 20px;
  background: var(--surface); border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.topbar h1 { font-size: 1rem; }
.topbar .badge { font-size: 0.75rem; color: var(--text-muted); }
.toolbar { margin-left: auto; display: flex; gap: 8px; }
.btn {
  padding: 6px 14px; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); cursor: pointer; font-size: 0.8rem; display: inline-flex; align-items: center; gap: 4px;
}
.btn:hover { background: oklch(95% 0 0); }
.btn:disabled { opacity: 0.4; cursor: not-allowed; }
.btn.primary { background: var(--accent); color: #fff; border-color: var(--accent); }
.btn.primary:hover { opacity: 0.85; }
.btn input[type="file"] { display: none; }

/* Layout */
.layout { display: grid; grid-template-columns: 185px 1fr 400px; flex: 1; overflow: hidden; transition: grid-template-columns 0.2s; }
.layout.left-collapsed { grid-template-columns: 24px 1fr 400px; }

/* LEFT: Document List */
.doc-list {
  background: oklch(96% 0.01 250); margin: 12px 6px 12px 12px;
  border-radius: var(--radius); border: 1px solid var(--border);
  display: flex; flex-direction: column; overflow: hidden;
}
.left-collapsed .doc-list { margin: 12px 0; border: none; background: transparent; width: 24px; min-width: 24px; }
.left-collapsed .doc-nav { display: none; }
.left-collapsed .doc-list h2 { font-size: 0; padding: 8px 4px; }
.left-collapsed .doc-list h2::before { content: "📂"; font-size: 0.85rem; }
.collapse-btn {
  float: right; width: 22px; height: 22px; border-radius: 4px;
  background: transparent; border: 1px solid var(--border);
  cursor: pointer; font-size: 0.6rem; color: var(--text-muted);
  display: flex; align-items: center; justify-content: center; padding: 0; line-height: 1;
}
.left-collapsed .collapse-btn { float: none; margin: 4px auto 0; }
.doc-list h2 {
  font-size: 0.78rem; padding: 12px 14px; border-bottom: 1px solid var(--border);
  flex-shrink: 0; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em;
}
.doc-nav { flex: 1; overflow-y: auto; padding: 6px 0; }
.doc-item {
  padding: 6px 14px; font-size: 0.73rem; cursor: pointer;
  border-left: 3px solid transparent; transition: all 0.15s;
}
.doc-item:hover { background: oklch(95% 0 0); }
.doc-item.active { background: oklch(93% 0.02 250); border-left-color: var(--accent); font-weight: 600; }
.doc-item.reviewed { color: oklch(55% 0.15 150); }
.doc-nav { flex: 1; }  /* take all remaining space */

/* CENTER: Editor */
.editor-panel {
  display: flex; flex-direction: column; background: var(--surface);
  margin: 12px 6px; border-radius: var(--radius); border: 1px solid var(--border); overflow: hidden;
}
.editor-header {
  padding: 8px 16px; border-bottom: 1px solid var(--border); flex-shrink: 0;
  display: flex; align-items: center; gap: 8px;
}
.editor-header .doc-title { font-size: 0.85rem; font-weight: 600; }
.editor-header .section-info { font-size: 0.7rem; color: var(--text-muted); }
.editor-header .hint { font-size: 0.7rem; color: var(--text-muted); margin-left: auto; }
.editor-body {
  flex: 1; overflow-y: auto; padding: 24px 32px;
  font-size: 0.88rem; line-height: 2.15;
}
.editor-body h2 { font-size: 1.1rem; margin: 28px 0 10px; }
.editor-body h3 { font-size: 0.95rem; margin: 20px 0 8px; }
.editor-body h4 { font-size: 0.85rem; margin: 14px 0 6px; }
.editor-body p { margin-bottom: 10px; }
.editor-body table { border-collapse: collapse; margin: 8px 0 16px; font-size: 0.8rem; width: 100%; }
.editor-body thead { border-bottom: 2px solid var(--border); }
.editor-body th, .editor-body td { padding: 6px 10px; border: 1px solid var(--border); text-align: left; }
.editor-body th { background: oklch(92% 0.02 250); font-weight: 600; color: #fff; }
.editor-body td { vertical-align: top; }
.editor-body tr:nth-child(even) td { background: oklch(98% 0 0); }
.editor-body ul, .editor-body ol { margin: 6px 0 10px 20px; }
.editor-body li { margin-bottom: 2px; }
.editor-body blockquote {
  border-left: 4px solid var(--accent); padding: 6px 14px; margin: 10px 0;
  background: oklch(96% 0.01 250); color: oklch(40% 0 0); font-size: 0.85rem;
}
.editor-body pre {
  background: oklch(22% 0 0); color: oklch(95% 0 0); padding: 14px 18px;
  border-radius: var(--radius); margin: 10px 0; overflow-x: auto; font-size: 0.8rem; line-height: 1.5;
}
.editor-body code { background: oklch(94% 0.01 250); padding: 1px 5px; border-radius: 3px; font-size: 0.82em; }
.editor-body pre code { background: transparent; padding: 0; }
.editor-body hr { border: none; border-top: 1px solid var(--border); margin: 18px 0; }
.editor-body b { font-weight: 700; }
.editor-body em { font-style: italic; color: oklch(45% 0 0); }
.editor-body img { max-width: 100%; border-radius: var(--radius); }
.editor-body a { color: var(--accent); }

.fp-mark {
  padding: 0 4px; border-radius: 2px; border-bottom: 2px solid;
  cursor: pointer; position: relative; transition: filter 0.15s;
}
.fp-mark:hover { filter: brightness(0.92); }
.fp-mark.ilf { background: oklch(94% 0.02 250); border-color: var(--ilf); }
.fp-mark.eif { background: oklch(94% 0.02 180); border-color: var(--eif); }
.fp-mark.ei  { background: oklch(94% 0.03 55); border-color: var(--ei); }
.fp-mark.eo  { background: oklch(94% 0.02 320); border-color: var(--eo); }
.fp-mark.eq  { background: oklch(94% 0.02 100); border-color: var(--eq); }
.fp-mark.jump-target {
  outline: 3px solid oklch(55% 0.15 55); outline-offset: 2px;
  animation: flash 0.6s ease-out;
}
@keyframes flash { 0% { background: oklch(85% 0.15 55); } 100% { background: inherit; } }
.fp-mark .fp-tag {
  position: absolute; top: -11px; left: 1px;
  font-size: 0.5rem; font-weight: 700;
}
.fp-mark.ilf .fp-tag { color: var(--ilf); }
.fp-mark.eif .fp-tag { color: var(--eif); }
.fp-mark.ei  .fp-tag { color: var(--ei); }
.fp-mark.eo  .fp-tag { color: var(--eo); }
.fp-mark.eq  .fp-tag { color: var(--eq); }

/* Floating picker */
.fp-picker-global {
  position: fixed; z-index: 100; display: none; gap: 2px;
  padding: 4px 6px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--border);
  box-shadow: 0 4px 16px oklch(0% 0 0 / 0.12);
  animation: popIn 0.15s ease-out;
}
.fp-picker-global.visible { display: inline-flex; }
@keyframes popIn { from { opacity: 0; transform: scale(0.9); } }
.fp-picker-global button {
  padding: 3px 8px; border: none; border-radius: 3px;
  cursor: pointer; font-size: 0.68rem; font-weight: 700;
}
/* ILF/EIF: colored background with white text */
.fp-picker-global button.ilf { background: var(--ilf); color: #fff; }
.fp-picker-global button.ilf:hover { filter: brightness(0.85); }
.fp-picker-global button.eif { background: var(--eif); color: #fff; }
.fp-picker-global button.eif:hover { filter: brightness(0.85); }
/* EI/EO/EQ: light background with colored text + border */
.fp-picker-global button.ei  { background: oklch(93% 0.04 55); color: var(--ei); border: 1.5px solid var(--ei); }
.fp-picker-global button.ei:hover  { filter: brightness(0.9); }
.fp-picker-global button.eo  { background: oklch(93% 0.03 320); color: var(--eo); border: 1.5px solid var(--eo); }
.fp-picker-global button.eo:hover  { filter: brightness(0.9); }
.fp-picker-global button.eq  { background: oklch(93% 0.03 100); color: var(--eq); border: 1.5px solid var(--eq); }
.fp-picker-global button.eq:hover  { filter: brightness(0.9); }
.fp-picker-global button.cancel { font-weight: 400; color: var(--text-muted); font-size: 0.65rem; background: oklch(95% 0 0); }

::selection { background: oklch(85% 0.08 250); }
.empty-state { display: flex; align-items: center; justify-content: center; height: 100%; color: var(--text-muted); font-size: 0.9rem; }
.empty-hint { color: var(--text-muted); font-size: 0.75rem; text-align: center; padding: 16px; }

/* RIGHT: Calc Panel */
.calc-panel {
  display: flex; flex-direction: column; background: oklch(96% 0.01 250);
  margin: 12px 12px 12px 6px; border-radius: var(--radius);
  border: 1px solid var(--border); overflow: hidden;
}
.calc-panel h2 {
  font-size: 0.85rem; padding: 10px 16px;
  border-bottom: 1px solid var(--border); flex-shrink: 0;
}
.calc-body { flex: 1; overflow-y: auto; }
.calc-tabs {
  display: flex; gap: 4px; padding: 6px 8px; flex-shrink: 0;
  border-bottom: 1px solid var(--border);
}
.calc-tab {
  flex: 1; padding: 6px 8px; text-align: center; font-size: 0.73rem;
  cursor: pointer; border: 1px solid var(--border); background: oklch(94% 0.01 250);
  border-radius: 4px 4px 0 0; border-bottom: none;
  color: var(--text-muted); transition: all 0.12s;
}
.calc-tab.active {
  background: oklch(96% 0.01 250); color: var(--text); font-weight: 600;
  border-color: var(--border); border-bottom: 2px solid oklch(96% 0.01 250);
  margin-bottom: -1px;
}
.calc-tab:hover:not(.active) { background: oklch(95% 0 0); color: var(--text); }

.section-label {
  font-size: 0.7rem; font-weight: 600; padding: 10px 16px 4px;
  color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em;
}

/* FP list table */
.fp-list-table { width: 100%; border-collapse: collapse; font-size: 0.72rem; }
.fp-list-table th {
  padding: 5px 8px; background: oklch(95% 0 0);
  border-bottom: 1px solid var(--border); text-align: left;
  font-size: 0.65rem; color: var(--text-muted);
}
.fp-list-table td { padding: 4px 8px; border-bottom: 1px solid oklch(94% 0 0); }
.fp-list-table tr { cursor: pointer; transition: background 0.1s; }
.fp-list-table tr:hover { background: oklch(95% 0 0); }
.fp-type-tag {
  display: inline-block; padding: 1px 5px; border-radius: 3px;
  font-size: 0.62rem; font-weight: 700; min-width: 28px; text-align: center;
}
.fp-type-tag.ilf { background: oklch(93% 0.03 250); color: var(--ilf); }
.fp-type-tag.eif { background: oklch(93% 0.03 180); color: var(--eif); }
.fp-type-tag.ei  { background: oklch(93% 0.04 55); color: var(--ei); }
.fp-type-tag.eo  { background: oklch(93% 0.03 320); color: var(--eo); }
.fp-type-tag.eq  { background: oklch(93% 0.03 100); color: var(--eq); }
.fp-list-table .delete-btn {
  font-size: 0.65rem; color: oklch(55% 0 0); cursor: pointer;
  padding: 0 2px;
}
.fp-list-table .delete-btn:hover { color: var(--ei); }

.marker-badge {
  display: inline-block; padding: 1px 6px; border-radius: 3px;
  font-size: 0.6rem; font-weight: 700; min-width: 28px; text-align: center;
}
.marker-badge.marker-ai { background: oklch(90% 0.08 250); color: oklch(50% 0.15 250); }
.marker-badge.marker-human { background: oklch(90% 0.06 150); color: oklch(45% 0.12 150); }

/* Mark context menu */
.mark-menu {
  position: fixed; z-index: 200; display: flex; flex-direction: column; gap: 1px;
  padding: 4px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--border);
  box-shadow: 0 4px 16px oklch(0% 0 0 / 0.12);
  min-width: 100px; animation: popIn 0.12s ease-out;
}
.mark-menu button {
  padding: 4px 10px; border: none; border-radius: 3px;
  cursor: pointer; font-size: 0.7rem; font-weight: 600; text-align: left;
  background: transparent; transition: background 0.1s;
}
.mark-menu button.current { font-weight: 700; }
.mark-menu button.ilf { color: var(--ilf); }
.mark-menu button.ilf:hover { background: oklch(93% 0.03 250); }
.mark-menu button.eif { color: var(--eif); }
.mark-menu button.eif:hover { background: oklch(93% 0.03 180); }
.mark-menu button.ei { color: var(--ei); }
.mark-menu button.ei:hover { background: oklch(93% 0.04 55); }
.mark-menu button.eo { color: var(--eo); }
.mark-menu button.eo:hover { background: oklch(93% 0.03 320); }
.mark-menu button.eq { color: var(--eq); }
.mark-menu button.eq:hover { background: oklch(93% 0.03 100); }
.mark-menu button.del { color: oklch(55% 0.18 25); margin-top: 2px; border-top: 1px solid var(--border); padding-top: 5px; border-radius: 0 0 3px 3px; }
.mark-menu button.del:hover { background: oklch(93% 0.03 25); }

.sort-toggle {
  display: flex; gap: 3px; padding: 4px 8px 8px;
}
.sort-toggle button {
  padding: 4px 5px; border: 1px solid var(--border); border-radius: 4px;
  cursor: pointer; font-size: 0.63rem; background: transparent; color: var(--text-muted);
  transition: all 0.12s; white-space: nowrap;
}
.sort-toggle button.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* FP Summary */
.fp-summary { width: 100%; border-collapse: collapse; font-size: 0.78rem; }
.fp-summary th {
  padding: 6px 10px; background: oklch(95% 0 0);
  border-bottom: 2px solid var(--border); text-align: left;
  font-size: 0.68rem; color: var(--text-muted);
}
.fp-summary td { padding: 5px 10px; border-bottom: 1px solid var(--border); }
.fp-summary .count-col { text-align: center; width: 36px; }
.fp-summary .weight-col { text-align: right; color: var(--text-muted); width: 44px; }
.fp-summary .subtotal-col { text-align: right; font-weight: 600; width: 55px; }
.fp-summary .total-row td { font-weight: 700; background: oklch(95% 0 0); font-size: 0.82rem; }
.fp-summary .derive-row td { font-size: 0.72rem; }

/* GSC table */
.gsc-table { width: 100%; border-collapse: collapse; font-size: 0.72rem; }
.gsc-table th, .gsc-table td { padding: 4px 8px; border-bottom: 1px solid var(--border); }
.gsc-table th { font-size: 0.65rem; color: var(--text-muted); text-align: left; background: oklch(95% 0 0); }
.gsc-table input { width: 36px; text-align: center; border: 1px solid var(--border); border-radius: 3px; padding: 2px; }
.gsc-table input:focus { outline: 2px solid oklch(85% 0.1 250); }
.gsc-result { padding: 8px 16px; font-size: 0.72rem; color: var(--text-muted); }

/* Parameters */
.param-group {
  padding: 8px 16px; display: grid; grid-template-columns: 1fr 1fr; gap: 6px;
}
.param-item { font-size: 0.73rem; }
.param-item label { display: block; color: var(--text-muted); font-size: 0.65rem; margin-bottom: 2px; }
.param-item input, .param-item select {
  width: 100%; padding: 4px 8px; border: 1px solid var(--border);
  border-radius: 4px; font-size: 0.8rem;
}
.param-item input:focus { outline: 2px solid oklch(85% 0.1 250); }

/* Cost rows */
.cost-row { display: flex; justify-content: space-between; padding: 4px 16px; font-size: 0.78rem; }
.cost-row.total { font-weight: 700; font-size: 0.88rem; border-top: 2px solid var(--border); margin-top: 4px; padding-top: 8px; }
.cost-row.warn { color: var(--ei); }

/* Toast */
.toast {
  position: fixed; bottom: 24px; right: 24px; padding: 8px 16px;
  background: var(--text); color: #fff; border-radius: var(--radius);
  font-size: 0.85rem; opacity: 0; transform: translateY(10px);
  transition: opacity 0.2s, transform 0.2s; z-index: 200; pointer-events: none;
}
.toast.show { opacity: 1; transform: translateY(0); }

/* Rules tab */
.rules-desc { font-size:0.68rem; color:var(--text-muted); padding:4px 8px; line-height:1.4; }
.rules-toolbar { display:flex; gap:4px; padding:4px 8px 8px; }
.rules-list { padding:0 8px; overflow-y:visible; }
.rule-item {
  border:1px solid var(--border); border-radius:4px; padding:6px 8px; margin-bottom:4px;
  font-size:0.7rem; background:var(--surface); transition:border-color 0.15s;
  display:flex; flex-direction:column;
}
.rule-item.disabled { opacity:0.45; }
.rule-row { display:flex; align-items:flex-start; gap:6px; }
.rule-num {
  display:inline-block; width:18px; height:18px; border-radius:9px;
  background:var(--accent); color:#fff; font-size:0.6rem; font-weight:700;
  text-align:center; line-height:18px; flex-shrink:0; margin-top:2px;
}
.rule-item.disabled .rule-num { background:var(--text-muted); }
.rule-item .rule-text {
  flex:1; border:1px solid transparent; border-radius:3px; padding:3px 5px;
  font-size:0.7rem; font-family:inherit; background:transparent; resize:none;
  min-height:2.2em; line-height:1.5;
}
.rule-item .rule-text:focus { border-color:var(--accent); outline:none; background:oklch(98% 0.01 250); }
.rule-meta { display:flex; justify-content:space-between; align-items:center; margin-top:3px; }
.rule-tags { display:flex; gap:2px; flex-wrap:wrap; }
.rule-tag {
  display:inline-block; padding:0 4px; border-radius:2px; font-size:0.58rem; font-weight:700;
  background:oklch(93% 0.01 250); color:var(--text-muted);
}
.rule-tag.active { background:var(--ilf); color:#fff; }
.rule-actions { display:flex; gap:2px; }
.rule-actions button {
  font-size:0.6rem; padding:1px 5px; border:1px solid var(--border); border-radius:3px;
  background:transparent; cursor:pointer; color:var(--text-muted);
}
.rule-actions button:hover { background:oklch(95% 0 0); }
.rule-actions button.del:hover { color:var(--ei); border-color:var(--ei); }
#ruleCheckResult.pass { background:oklch(92% 0.04 150); color:oklch(35% 0.08 150); }
#ruleCheckResult.warn { background:oklch(92% 0.04 55); color:oklch(35% 0.08 55); }