/* ========== 主题变量（三套方案可切换） ========== */
:root, [data-theme="minimal"] {
  --bg: #ffffff;
  --text: #1d1d1f;
  --muted: #86868b;
  --border: #e8e8ed;
  --card: #f5f5f7;
  --hover: rgba(0,0,0,.04);
  --accent: #0071e3;
  --shadow: 0 1px 3px rgba(0,0,0,.08), 0 12px 32px rgba(0,0,0,.10);
  --canvas-bg: #fafafa;
}
[data-theme="warm"] {
  --bg: #f5f5f7;
  --text: #1d1d1f;
  --muted: #86868b;
  --border: #e3e3e8;
  --card: #ffffff;
  --hover: rgba(0,0,0,.05);
  --shadow: 0 1px 3px rgba(0,0,0,.06), 0 10px 28px rgba(0,0,0,.08);
  --canvas-bg: #ebebf0;
}
[data-theme="dark"] {
  --bg: #1c1c1e;
  --text: #f5f5f7;
  --muted: #98989d;
  --border: #38383a;
  --card: #2c2c2e;
  --hover: rgba(255,255,255,.06);
  --shadow: 0 1px 3px rgba(0,0,0,.4), 0 12px 32px rgba(0,0,0,.5);
  --canvas-bg: #111112;
}
[data-theme="notion"] {
  --bg: #ffffff;
  --text: #37352f;
  --muted: #9b9a97;
  --border: #e9e9e7;
  --card: #f1f1ef;
  --hover: rgba(55,53,47,.06);
  --shadow: 0 1px 3px rgba(15,15,15,.08), 0 10px 28px rgba(15,15,15,.10);
  --canvas-bg: #f7f6f3;
}
[data-theme="linear"] {
  --bg: #0f1016;
  --text: #e6e6ef;
  --muted: #7f8098;
  --border: #23242f;
  --card: #1b1c24;
  --hover: rgba(255,255,255,.07);
  --shadow: 0 1px 3px rgba(0,0,0,.5), 0 12px 32px rgba(0,0,0,.55);
  --canvas-bg: #0a0b10;
}
[data-theme="mint"] {
  --bg: #fbfdfb;
  --text: #1f2d24;
  --muted: #7c9184;
  --border: #dfeae2;
  --card: #eef6f0;
  --hover: rgba(14,159,110,.08);
  --shadow: 0 1px 3px rgba(20,60,40,.08), 0 10px 28px rgba(20,60,40,.10);
  --canvas-bg: #eaf4ec;
}

/* ========== 基础 ========== */
* { margin: 0; padding: 0; box-sizing: border-box; }
html, body { height: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14px;
  transition: background .35s ease, color .35s ease;
}
button { font-family: inherit; cursor: pointer; }
input, select { font-family: inherit; color: inherit; }
.hidden { display: none !important; }
.muted { color: var(--muted); }
.small { font-size: 12px; font-weight: 400; }

/* ========== 顶栏 ========== */
.topbar {
  position: fixed; top: 0; left: 0; right: 0; height: 56px; z-index: 50;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 20px;
  background: color-mix(in srgb, var(--bg) 82%, transparent);
  backdrop-filter: blur(18px); -webkit-backdrop-filter: blur(18px);
  border-bottom: 1px solid var(--border);
}
.topbar-left { display: flex; align-items: center; gap: 10px; font-weight: 600; font-size: 15px; }
.logo-dot { width: 10px; height: 10px; border-radius: 50%; background: var(--accent); animation: pulse 2.4s ease infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .45; } }
.topbar-right { display: flex; align-items: center; gap: 10px; }
.save-status { font-size: 12px; color: var(--muted); margin-right: 6px; transition: opacity .3s; }

/* ========== 按钮 ========== */
.btn {
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  border-radius: 980px; padding: 7px 16px; font-size: 13px;
  transition: transform .15s cubic-bezier(.2,.8,.3,1), background .2s, border-color .2s;
}
.btn:hover { background: var(--hover); }
.btn:active { transform: scale(.96); }
.btn.primary { background: var(--accent); color: #fff; border-color: transparent; }
.btn.primary:hover { filter: brightness(1.08); }
.btn.ghost { background: transparent; }
.btn.dash { width: 100%; border-style: dashed; color: var(--muted); margin-top: 10px; }
.btn.danger { color: #e5484d; border-color: #f2b8b9; }
.icon-btn {
  border: none; background: var(--hover); color: var(--muted);
  width: 28px; height: 28px; border-radius: 50%; font-size: 12px;
}
.icon-btn:hover { color: var(--text); }
.side-toggle { width: 30px; height: 30px; font-size: 13px; margin-right: 2px; }

/* ========== 侧栏收起 ========== */
body.side-hidden .sidebar { display: none; }
body.side-hidden .side-fab {
  display: flex;
}
.side-fab {
  display: none; position: fixed; left: 0; top: 50%; z-index: 45;
  width: 26px; height: 64px; border: 1px solid var(--border); border-left: none;
  border-radius: 0 10px 10px 0; background: var(--bg); color: var(--muted);
  align-items: center; justify-content: center; font-size: 13px;
  box-shadow: 2px 0 10px rgba(0,0,0,.08);
}
.side-fab:hover { color: var(--text); }

/* ========== 工具栏 ========== */
.toolbar-zone {
  position: sticky; top: 0; z-index: 40;
  display: flex; flex-direction: column; gap: 6px;
  padding: 6px 14px;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
}
.editor-toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 2px; }
.tb-btn {
  height: 28px; min-width: 28px; padding: 0 8px; border: none;
  background: transparent; border-radius: 6px; color: var(--text); font-size: 13px;
  display: inline-flex; align-items: center; justify-content: center; gap: 4px;
}
.tb-btn:hover { background: var(--hover); }
.tb-btn:disabled { opacity: .35; cursor: default; }
.tb-btn.active { background: color-mix(in srgb, var(--accent) 16%, transparent); color: var(--accent); }
.tb-sep { width: 1px; height: 18px; background: var(--border); margin: 0 5px; flex-shrink: 0; }
.tb-select {
  height: 26px; border: 1px solid var(--border); background: var(--card);
  border-radius: 6px; font-size: 12px; padding: 0 4px; color: var(--text); outline: none;
}
.tb-color { width: 26px; height: 26px; padding: 0; border: none; background: none; cursor: pointer; border-radius: 6px; }

/* ========== 查找替换 ========== */
.find-bar { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }
.find-bar input[type="text"] {
  width: 190px; padding: 5px 10px; border: 1px solid var(--border);
  border-radius: 8px; background: var(--card); font-size: 13px; outline: none;
}
.find-bar input:focus { border-color: var(--accent); }
.find-hit { background: #ffe58a; color: #333; border-radius: 2px; }
.find-cur { background: #ff9632; color: #fff; }

/* ========== 缩放控件 ========== */
.zoom-widget {
  position: fixed; right: 18px; bottom: 18px; z-index: 60;
  display: flex; align-items: center; gap: 2px;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 999px; padding: 4px 8px; box-shadow: var(--shadow);
}
.zoom-val { min-width: 44px; text-align: center; font-size: 12px; color: var(--muted); }

/* ========== 布局 ========== */
.layout { display: flex; padding-top: 56px; height: 100vh; }
.sidebar {
  width: 300px; flex-shrink: 0; overflow-y: auto;
  border-right: 1px solid var(--border);
  padding: 18px 16px 40px;
  background: var(--bg);
}
.side-panel { margin-bottom: 26px; }
.side-panel h3 { font-size: 13px; margin-bottom: 12px; display: flex; align-items: baseline; justify-content: space-between; }
.canvas-wrap { flex: 1; overflow: auto; background: var(--canvas-bg); }
.canvas-inner { padding: 36px; display: flex; justify-content: center; }

/* ========== 侧栏控件 ========== */
.field { margin-bottom: 12px; }
.field label { display: block; font-size: 12px; color: var(--muted); margin-bottom: 5px; }
.field input[type="text"], .field input[type="number"], .field select {
  width: 100%; padding: 7px 10px; border: 1px solid var(--border);
  border-radius: 8px; background: var(--card); font-size: 13px; outline: none;
  transition: border-color .2s;
}
.field input:focus, .field select:focus { border-color: var(--accent); }
.field-row { display: flex; gap: 8px; }
.field-row .field { flex: 1; }
.switch-row { display: flex; align-items: center; justify-content: space-between; padding: 6px 0; font-size: 13px; }
.switch { position: relative; width: 38px; height: 22px; flex-shrink: 0; }
.switch input { opacity: 0; width: 0; height: 0; }
.switch .track {
  position: absolute; inset: 0; border-radius: 22px; background: var(--border);
  transition: background .25s;
}
.switch .track::after {
  content: ""; position: absolute; top: 2px; left: 2px; width: 18px; height: 18px;
  border-radius: 50%; background: #fff; box-shadow: 0 1px 3px rgba(0,0,0,.25);
  transition: transform .25s cubic-bezier(.2,.8,.3,1);
}
.switch input:checked + .track { background: var(--accent); }
.switch input:checked + .track::after { transform: translateX(16px); }

.struct-sec { margin-bottom: 10px; }
.struct-sec-title {
  display: flex; justify-content: space-between; align-items: center;
  background: var(--card); border-radius: 8px; padding: 7px 10px; font-size: 13px;
}
.struct-q {
  display: flex; justify-content: space-between; align-items: center;
  padding: 5px 10px 5px 22px; font-size: 12.5px; color: var(--muted);
  border-radius: 8px; cursor: pointer; transition: background .15s;
}
.struct-q:hover { background: var(--hover); color: var(--text); }
.struct-q .mini { visibility: hidden; }
.struct-q:hover .mini { visibility: visible; }
.mini-btn {
  border: none; background: transparent; color: var(--muted); font-size: 11px;
  padding: 2px 5px; border-radius: 5px;
}
.mini-btn:hover { background: var(--hover); color: var(--text); }
.mini-btn.x:hover { color: #e5484d; }

/* ========== 试卷纸 ========== */
.paper {
  --pw: 210mm; --ph: 297mm;
  --mt: 20mm; --mr: 18mm; --mb: 20mm; --ml: 18mm;
  --cols: 1; --ff: "SimSun","Songti SC",serif; --fs: 10.5pt; --lh: 1.7; --qgap: 14px;
  width: var(--pw); min-height: var(--ph);
  background: #fff; color: #111;
  padding: var(--mt) var(--mr) var(--mb) var(--ml);
  box-shadow: var(--shadow);
  border-radius: 4px;
  font-family: var(--ff); font-size: var(--fs); line-height: var(--lh);
  columns: var(--cols); column-gap: 10mm;
  column-fill: auto;
  position: relative;
  transition: width .35s cubic-bezier(.2,.8,.3,1), padding .35s cubic-bezier(.2,.8,.3,1);
}
.paper [contenteditable] { outline: none; border-radius: 2px; transition: background .2s; }
.paper [contenteditable]:hover { background: rgba(0,113,227,.05); }
.paper [contenteditable]:focus { background: rgba(0,113,227,.09); }
.paper [contenteditable]:empty::before { content: attr(data-ph); color: #c0c0c4; }

.seal-line {
  position: absolute; left: 6mm; top: 0; bottom: 0;
  border-left: 1px dashed #999;
  writing-mode: vertical-rl;
  font-size: 8.5pt; color: #555; letter-spacing: 4px;
  display: flex; align-items: center;
}
.exam-head { column-span: all; text-align: center; margin-bottom: 8mm; }
.exam-title { font-size: 1.6em; font-weight: 700; letter-spacing: 1px; }
.exam-sub { font-size: 1em; margin-top: 3mm; color: #333; }
.exam-notes {
  text-align: left; font-size: .85em; color: #444; border: 1px solid #ccc;
  padding: 2.5mm 4mm; margin-top: 4mm; margin-bottom: 3mm; white-space: pre-wrap;
  column-span: all;
}
.info-line { text-align: center; font-size: 1.05em; margin-bottom: 5mm; column-span: all; }
.info-line span { margin: 0 6mm; }

.score-table { width: 100%; border-collapse: collapse; font-size: .85em; margin-bottom: 4mm; column-span: all; }
.score-table td, .score-table th { border: 1px solid #999; padding: 1mm 2mm; text-align: center; height: 7mm; }
.score-table th { font-weight: 400; background: #f3f3f3; }

.section { break-inside: auto; }
.sec-head { display: flex; align-items: baseline; gap: 3mm; margin-bottom: 2mm; position: relative; }
.sec-title { font-weight: 700; font-size: 1.12em; flex-shrink: 0; }
.sec-desc { font-size: .9em; color: #555; }

.question { margin-bottom: var(--qgap); break-inside: avoid-column; position: relative; }
.q-body { display: flex; gap: 2mm; }
.q-num { flex-shrink: 0; min-width: 6mm; }
.q-main { flex: 1; min-width: 0; }
.q-stem { white-space: pre-wrap; }
.q-points { font-size: .85em; color: #666; margin-left: 1mm; }
.opts { display: flex; flex-wrap: wrap; margin-top: 1.5mm; }
.opts.wrap-col { display: grid; grid-template-columns: 1fr 1fr; }
.opt { display: flex; gap: 1mm; margin-right: 8mm; margin-bottom: 1mm; min-width: 30mm; }
.opt .opt-label { flex-shrink: 0; }
.tf-opts { display: flex; gap: 10mm; margin-top: 1.5mm; }
.answer-lines { margin-top: 2mm; }
.answer-lines .aline { border-bottom: 1px solid #999; height: 8mm; }
.q-img { max-width: 100%; display: block; margin-top: 2mm; border-radius: 2px; }
.sec-num { font-weight: 700; font-size: 1.12em; flex-shrink: 0; }
.empty-hint {
  column-span: all; text-align: center; color: #999;
  border: 1.5px dashed #ccc; border-radius: 10px; padding: 36px 20px; margin: 6mm 0;
}
.answer-page { column-span: all; break-before: page; margin-top: 8mm; }
.ap-title { font-weight: 700; font-size: 1.3em; text-align: center; margin-bottom: 4mm; }
.ap-sec { font-weight: 700; margin: 3mm 0 1.5mm; }
.ap-item { margin-bottom: 1.2mm; }
.paper.preview .q-toolbar, .paper.preview .sec-toolbar, .paper.preview .add-q-bar { display: none !important; }
.paper.preview [contenteditable]:hover { background: transparent; }

.q-toolbar {
  position: absolute; top: -14px; right: 0; display: none; z-index: 5;
  background: #333; color: #fff; border-radius: 8px;
  padding: 2px 4px; align-items: center; gap: 1px; box-shadow: 0 4px 14px rgba(0,0,0,.25);
}
.question:hover .q-toolbar { display: inline-flex; }
.q-toolbar button, .sec-toolbar button {
  border: none; background: transparent; color: inherit; font-size: 11px;
  padding: 2px 6px; border-radius: 5px;
}
.q-toolbar button:hover, .sec-toolbar button:hover { background: rgba(255,255,255,.18); }
.q-toolbar select {
  border: none; background: transparent; color: inherit; font-size: 11px; outline: none;
}
.q-toolbar select option { color: #111; }
.sec-toolbar {
  display: none; position: absolute; right: 0; top: -8px; z-index: 5;
  background: #333; color: #fff; border-radius: 8px; padding: 2px 4px;
}
.sec-head:hover .sec-toolbar { display: inline-flex; }
.add-q-bar { margin: 1mm 0 6mm; display: flex; gap: 6px; flex-wrap: wrap; }
.add-q-bar button {
  border: 1px dashed #bbb; background: transparent; color: #888;
  font-size: 11px; padding: 3px 10px; border-radius: 999px;
}
.add-q-bar button:hover { border-color: #0071e3; color: #0071e3; }

/* ========== 弹窗 ========== */
.modal-mask {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(0,0,0,.4); backdrop-filter: blur(6px);
  display: flex; align-items: center; justify-content: center;
  animation: fadeIn .2s ease;
}
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
.modal {
  width: min(560px, 92vw); max-height: 80vh; overflow: hidden;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 18px; box-shadow: var(--shadow);
  display: flex; flex-direction: column;
  animation: pop .28s cubic-bezier(.2,.9,.3,1.2);
}
@keyframes pop { from { opacity: 0; transform: scale(.94) translateY(10px); } to { opacity: 1; transform: none; } }
.modal-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 16px 20px; border-bottom: 1px solid var(--border);
}
.modal-head h2 { font-size: 16px; }
.modal-body { padding: 20px; overflow-y: auto; }
.modal-body h4 { font-size: 13px; margin: 18px 0 10px; }
.modal-body h4:first-child { margin-top: 0; }

.list-item {
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 11px 12px; border: 1px solid var(--border); border-radius: 12px; margin-bottom: 8px;
}
.list-item .li-main { min-width: 0; }
.list-item .li-name { font-size: 13.5px; font-weight: 500; display: flex; gap: 6px; align-items: center; }
.list-item .li-sub { font-size: 12px; color: var(--muted); margin-top: 2px; }
.tag { font-size: 10px; padding: 1px 7px; border-radius: 999px; background: var(--card); color: var(--muted); border: 1px solid var(--border); }
.tag.accent { background: color-mix(in srgb, var(--accent) 12%, transparent); color: var(--accent); border-color: transparent; }
.li-actions { display: flex; gap: 6px; flex-shrink: 0; }
.li-actions .btn { padding: 4px 12px; font-size: 12px; }

.theme-cards { display: grid; grid-template-columns: repeat(3,1fr); gap: 10px; }
.theme-card {
  border: 2px solid var(--border); border-radius: 14px; padding: 10px;
  text-align: center; background: var(--card); cursor: pointer;
  transition: border-color .2s, transform .2s;
}
.theme-card:hover { transform: translateY(-2px); }
.theme-card.active { border-color: var(--accent); }
.theme-preview { height: 46px; border-radius: 8px; margin-bottom: 8px; border: 1px solid var(--border); }
.theme-name { font-size: 12.5px; font-weight: 500; }
.theme-desc { font-size: 11px; color: var(--muted); margin-top: 2px; }

.accent-dots { display: flex; gap: 10px; }
.accent-dot { width: 26px; height: 26px; border-radius: 50%; border: 2px solid transparent; cursor: pointer; transition: transform .15s; }
.accent-dot:hover { transform: scale(1.15); }
.accent-dot.active { border-color: var(--text); }

/* ========== 打印 ========== */
@media print {
  body { background: #fff !important; }
  .topbar, .toolbar-zone, .find-bar, .zoom-widget, .side-fab, .ctx-menu, .sidebar,
  .q-toolbar, .sec-toolbar, .add-q-bar, .toast, .modal-mask { display: none !important; }
  .layout { display: block; padding-top: 0; height: auto; }
  .canvas-wrap, .canvas-inner { padding: 0; overflow: visible; background: none; }
  .paper {
    box-shadow: none !important; border-radius: 0 !important;
    width: auto !important; min-height: 0 !important;
    margin: 0; transform: none !important;
  }
}

/* ========== Toast ========== */
.toast {
  position: fixed; bottom: 28px; left: 50%; transform: translateX(-50%);
  background: var(--text); color: var(--bg); font-size: 13px;
  padding: 10px 20px; border-radius: 999px; z-index: 200;
  box-shadow: var(--shadow); animation: toastIn .3s cubic-bezier(.2,.9,.3,1.2);
}
@keyframes toastIn { from { opacity: 0; transform: translate(-50%, 14px); } to { opacity: 1; transform: translate(-50%, 0); } }

/* ========== 图标 ========== */
.ic { display: inline-flex; align-items: center; justify-content: center; width: 15px; height: 15px; flex-shrink: 0; }
.ic svg { display: block; }
.btn { display: inline-flex; align-items: center; gap: 6px; }
.btn.dash { justify-content: center; }
.mini-btn { display: inline-flex; align-items: center; }
.mini-btn svg { display: block; }
.tb-btn svg { flex-shrink: 0; }
.side-toggle svg { display: block; }
.theme-card .theme-name, .theme-card .theme-desc { display: block; }

/* ========== 右键菜单 ========== */
.ctx-menu {
  position: fixed; z-index: 300; min-width: 190px;
  background: var(--bg); border: 1px solid var(--border);
  border-radius: 12px; box-shadow: var(--shadow); padding: 5px;
  animation: pop .16s cubic-bezier(.2,.9,.3,1.15);
}
.ctx-item {
  display: flex; align-items: center; gap: 9px;
  padding: 7px 12px; border-radius: 8px; font-size: 13px;
  cursor: pointer; color: var(--text); user-select: none;
}
.ctx-item:hover { background: var(--hover); }
.ctx-item svg { color: var(--muted); flex-shrink: 0; }
.ctx-item:hover svg { color: var(--accent); }
.ctx-sep { height: 1px; background: var(--border); margin: 5px 8px; }

/* ========== 云端 / 后台 ========== */
.stat-card {
  flex: 1; border: 1px solid var(--border); border-radius: 12px;
  padding: 12px; text-align: center; background: var(--card);
}
.stat-card b { display: block; font-size: 20px; margin-bottom: 2px; }
.stat-card span { font-size: 11px; color: var(--muted); }

/* ========== 工具栏固定 / 收起 ========== */
.toolbar-main { display: flex; align-items: flex-start; gap: 8px; }
.editor-toolbar { flex: 1; min-width: 0; }
.toolbar-ctrl { display: flex; gap: 2px; flex-shrink: 0; }
.toolbar-zone.unpinned { position: static; }
.toolbar-zone.collapsed .editor-toolbar, .toolbar-zone.collapsed .find-bar { display: none; }
.toolbar-zone.collapsed { padding: 4px 14px; }
.code-area {
  width: 100%; border: 1px solid var(--border); border-radius: 8px;
  background: var(--card); color: var(--text);
  font-family: ui-monospace, Menlo, Consolas, monospace; font-size: 12px;
  padding: 8px; outline: none; resize: vertical;
}
.code-area:focus { border-color: var(--accent); }
[data-theme="obsidian"] {
  --bg: #0a0a0b; --text: #f2f2f2; --muted: #8e8e93;
  --border: #26262b; --card: #17171a; --hover: rgba(255,255,255,.08);
  --shadow: 0 1px 3px rgba(0,0,0,.6), 0 12px 32px rgba(0,0,0,.6);
  --canvas-bg: #050506;
}
[data-theme="sakura"] {
  --bg: #fff7f9; --text: #3d2b31; --muted: #b08e98;
  --border: #f3dfe5; --card: #ffffff; --hover: rgba(236,106,156,.08);
  --shadow: 0 1px 3px rgba(200,100,140,.10), 0 10px 28px rgba(200,100,140,.12);
  --canvas-bg: #fdf0f4;
}

/* ========== 引导页 ========== */
.welcome {
  position: fixed; inset: 0; z-index: 400; overflow-y: auto;
  background:
    radial-gradient(1200px 500px at 20% -10%, color-mix(in srgb, var(--accent) 14%, transparent), transparent),
    var(--bg);
  display: flex; justify-content: center;
  animation: fadeIn .3s ease;
}
.welcome.closing { opacity: 0; transition: opacity .3s; pointer-events: none; }
.welcome-inner { max-width: 760px; width: 100%; padding: 72px 28px 60px; }
.w-brand { display: flex; align-items: center; gap: 10px; font-weight: 700; font-size: 16px; margin-bottom: 40px; }
.welcome h1 { font-size: 40px; line-height: 1.25; letter-spacing: -.5px; margin-bottom: 14px; }
.w-sub { font-size: 16px; color: var(--muted); margin-bottom: 40px; }
.w-cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 14px; margin-bottom: 36px; }
.w-card {
  border: 1px solid var(--border); border-radius: 16px; padding: 18px;
  background: var(--card); transition: transform .25s cubic-bezier(.2,.8,.3,1), box-shadow .25s;
}
.w-card:hover { transform: translateY(-3px); box-shadow: var(--shadow); }
.w-card svg { color: var(--accent); margin-bottom: 10px; }
.w-card b { display: block; font-size: 15px; margin-bottom: 4px; }
.w-card span { font-size: 13px; color: var(--muted); line-height: 1.6; }
.w-steps { display: flex; gap: 22px; flex-wrap: wrap; margin-bottom: 36px; }
.w-step { display: flex; align-items: center; gap: 10px; font-size: 14px; color: var(--muted); }
.w-step i {
  font-style: normal; width: 26px; height: 26px; border-radius: 50%;
  background: var(--accent); color: #fff; display: inline-flex;
  align-items: center; justify-content: center; font-size: 13px; font-weight: 600;
}
.w-enter { font-size: 15px; padding: 12px 34px; }
.w-foot { margin-top: 22px; font-size: 12px; color: var(--muted); }

/* ========== 公式编辑器 ========== */
.fm-group { margin-bottom: 12px; }
.fm-gname { font-size: 12px; color: var(--muted); margin-bottom: 6px; }
.fm-syms { display: flex; flex-wrap: wrap; gap: 6px; }
.fm-sym {
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  border-radius: 8px; padding: 5px 11px; font-size: 12.5px;
  transition: transform .12s, border-color .15s;
}
.fm-sym:hover { border-color: var(--accent); color: var(--accent); transform: translateY(-1px); }
.fm-tpls { display: flex; flex-wrap: wrap; gap: 8px; }
.fm-preview {
  border: 1px solid var(--border); border-radius: 10px; background: #fff; color: #111;
  min-height: 64px; padding: 14px; font-size: 16px; overflow-x: auto;
}

/* ========== 细节润色 ========== */
::-webkit-scrollbar { width: 9px; height: 9px; }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 9px; border: 2px solid transparent; background-clip: content-box; }
::-webkit-scrollbar-thumb:hover { background: var(--muted); border: 2px solid transparent; background-clip: content-box; }
::-webkit-scrollbar-track { background: transparent; }
.side-panel {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 14px; padding: 14px; margin-bottom: 14px;
}
.seg-row { display: flex; gap: 8px; }
.seg { flex: 1; }
.seg.active { background: var(--accent); color: #fff; border-color: transparent; }
.tl-chg {
  display: flex; align-items: center; gap: 6px; font-size: 12.5px;
  color: var(--text); background: var(--card); border: 1px solid var(--border);
  border-radius: 8px; padding: 6px 10px; margin-bottom: 6px;
}
.tl-chg svg { color: var(--accent); flex-shrink: 0; }

/* ========== 时间回溯 · 日志时间线 ========== */
.log-head { display: flex; align-items: center; gap: 10px; margin-bottom: 16px; flex-wrap: wrap; }
.timeline { position: relative; }
.tl-item { display: flex; gap: 12px; padding: 0 0 16px 0; position: relative; }
.tl-rail { width: 18px; display: flex; justify-content: center; position: relative; flex-shrink: 0; }
.tl-rail::before {
  content: ""; position: absolute; top: 0; bottom: -16px; left: 50%; width: 2px;
  background: var(--border); transform: translateX(-50%);
}
.tl-item:last-child .tl-rail::before { bottom: 8px; }
.tl-dot {
  width: 10px; height: 10px; border-radius: 50%; background: var(--accent);
  margin-top: 4px; position: relative; z-index: 1;
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent);
}
.tl-now .tl-dot { background: #34c759; box-shadow: 0 0 0 3px rgba(52,199,89,.2); }
.tl-redo .tl-dot { background: var(--muted); box-shadow: none; }
.tl-body { flex: 1; min-width: 0; }
.tl-label { display: flex; align-items: center; gap: 8px; font-size: 13.5px; }
.tl-label svg { color: var(--accent); flex-shrink: 0; }
.tl-redo .tl-label svg { color: var(--muted); }
.tl-sub { font-size: 12px; color: var(--muted); margin: 3px 0 6px; }
.tl-btn { padding: 3px 10px; font-size: 12px; }

/* ========== 首页 / 新建向导 ========== */
.w-topbar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 44px; }
.w-actions { display: flex; gap: 12px; margin-bottom: 26px; }
.w-h4 { margin: 0 0 12px; font-size: 13px; color: var(--muted); }
.w-recent { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 32px; }
.w-form { max-width: 640px; margin-bottom: 6px; }
.w-recipes { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 10px; }
.w-recipe {
  border: 2px solid var(--border); border-radius: 14px; padding: 14px;
  background: var(--card); cursor: pointer;
  transition: border-color .2s, transform .2s;
}
.w-recipe:hover { transform: translateY(-2px); }
.w-recipe.active { border-color: var(--accent); }
.w-recipe b { display: block; font-size: 14px; margin-bottom: 4px; }
.w-recipe span { font-size: 12px; color: var(--muted); }