:root {
  --bg: #f7f7f8; --panel: #ffffff; --panel-2: #fbfbfc; --fg: #18181b; --muted: #71717a; --faint: #a1a1aa;
  --border: #e4e4e7; --border-strong: #d4d4d8; --hover: #f1f1f3; --accent: #2563eb; --accent-fg: #fff;
  --accent-soft: #eff4ff; --ok: #16a34a; --warn: #d97706; --err: #dc2626;
  --shadow: 0 1px 2px rgba(0,0,0,.04), 0 4px 16px rgba(0,0,0,.06);
  --radius: 10px; --header-h: 52px; --side-w: 232px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  --mono: "JetBrains Mono", "Cascadia Code", Consolas, "Microsoft YaHei", monospace;
  color-scheme: light;
}
.theme-dark {
  --bg: #0f1012; --panel: #17181b; --panel-2: #1b1c20; --fg: #ececef; --muted: #9a9aa3; --faint: #6b6b74;
  --border: #2a2b30; --border-strong: #393a40; --hover: #222328; --accent: #5b8cff; --accent-soft: #1b2540;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 6px 24px rgba(0,0,0,.4);
  color-scheme: dark;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body { background: var(--bg); color: var(--fg); font: 14px/1.5 var(--font); -webkit-font-smoothing: antialiased; overflow: hidden; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: var(--accent); }
.hidden { display: none !important; }
/* 键盘操作时可见的焦点框（鼠标点击不显示） */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; border-radius: 6px; }
.CodeMirror :focus-visible, textarea:focus-visible, .input:focus-visible { outline-offset: -1px; }
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { animation: none !important; transition: none !important; } }

/* ---------- 外框 ---------- */
.app { display: grid; grid-template-rows: var(--header-h) 1fr; grid-template-columns: var(--side-w) 1fr; height: 100vh; }
.app.side-collapsed { grid-template-columns: 0 minmax(0, 1fr) !important; }
.app.focus { grid-template-rows: 0 1fr; grid-template-columns: 0 minmax(0, 1fr) !important; }
.app.focus .topbar, .app.focus .sidebar { visibility: hidden; }
.topbar { grid-column: 1 / -1; display: flex; align-items: center; gap: 12px; padding: 0 14px; background: var(--panel); border-bottom: 1px solid var(--border); z-index: 5; }
.brand { display: flex; align-items: center; gap: 9px; font-weight: 700; font-size: 15px; letter-spacing: -.01em; color: var(--fg); text-decoration: none; min-width: 190px; }
.brand-mark { width: 26px; height: 26px; border-radius: 7px; background: var(--fg); color: var(--panel); display: grid; place-items: center; font: 700 12px var(--mono); }
.search-btn { display: flex; align-items: center; gap: 8px; flex: 0 1 420px; height: 34px; padding: 0 10px; border: 1px solid var(--border); border-radius: 8px; background: var(--panel-2); color: var(--muted); cursor: pointer; }
.search-btn:hover { border-color: var(--border-strong); }
.search-btn kbd { margin-left: auto; font: 11px var(--mono); border: 1px solid var(--border); border-radius: 4px; padding: 1px 5px; }
.topbar .spacer { flex: 1; }
.engine-pill { display: flex; align-items: center; gap: 6px; font-size: 12px; color: var(--muted); padding: 3px 9px; border: 1px solid var(--border); border-radius: 99px; white-space: nowrap; }
.dot { width: 7px; height: 7px; border-radius: 50%; background: var(--faint); }
.dot.ok { background: var(--ok); } .dot.warn { background: var(--warn); } .dot.err { background: var(--err); }

.icon-btn { display: inline-grid; place-items: center; width: 32px; height: 32px; border: 0; background: transparent; border-radius: 7px; color: var(--muted); cursor: pointer; flex: none; }
.icon-btn:hover { background: var(--hover); color: var(--fg); }
.icon-btn.active { background: var(--accent-soft); color: var(--accent); }
.icon-btn svg, .btn svg, .nav-item svg { width: 17px; height: 17px; stroke: currentColor; fill: none; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; flex: none; }

.sidebar { background: var(--panel); border-right: 1px solid var(--border); overflow: auto; padding: 10px 8px 24px; }
.nav-group { margin: 8px 0 14px; }
.nav-title { font-size: 11px; font-weight: 600; color: var(--faint); text-transform: uppercase; letter-spacing: .06em; padding: 0 10px 6px; }
.nav-item { display: flex; align-items: center; gap: 9px; padding: 7px 10px; border-radius: 7px; color: var(--fg); text-decoration: none; font-size: 13.5px; white-space: nowrap; }
.nav-item:hover { background: var(--hover); }
.nav-item.active { background: var(--accent-soft); color: var(--accent); font-weight: 550; }
.nav-item .badge { margin-left: auto; font-size: 10.5px; color: var(--muted); border: 1px solid var(--border); border-radius: 99px; padding: 0 6px; }
.nav-item.active .badge { color: var(--accent); border-color: currentColor; }

.main { overflow: hidden; position: relative; min-width: 0; }
.view { height: 100%; display: flex; flex-direction: column; min-height: 0; }

/* ---------- 通用控件 ---------- */
.btn { display: inline-flex; align-items: center; gap: 6px; height: 32px; padding: 0 12px; border: 1px solid var(--border); background: var(--panel); border-radius: 8px; cursor: pointer; white-space: nowrap; font-size: 13px; }
.btn:hover { border-color: var(--border-strong); background: var(--hover); }
.btn.primary { background: var(--accent); color: var(--accent-fg); border-color: var(--accent); }
.btn.primary:hover { filter: brightness(1.07); }
.btn.ghost { border-color: transparent; background: transparent; }
.btn.ghost:hover { background: var(--hover); }
.btn:disabled { opacity: .55; cursor: default; }
.btn.small { height: 28px; padding: 0 9px; font-size: 12.5px; }
.seg { display: inline-flex; border: 1px solid var(--border); border-radius: 8px; padding: 2px; background: var(--panel-2); }
.seg button { border: 0; background: transparent; padding: 3px 10px; border-radius: 6px; cursor: pointer; color: var(--muted); font-size: 12.5px; }
.seg button.on { background: var(--panel); color: var(--fg); box-shadow: 0 1px 2px rgba(0,0,0,.08); }
.field { display: flex; flex-direction: column; gap: 4px; font-size: 12.5px; color: var(--muted); }
.input, select.input { height: 32px; padding: 0 10px; border: 1px solid var(--border); border-radius: 8px; background: var(--panel); min-width: 0; }
.input:focus, textarea:focus { outline: 2px solid color-mix(in srgb, var(--accent) 35%, transparent); outline-offset: -1px; border-color: var(--accent); }
.check { display: inline-flex; align-items: center; gap: 6px; font-size: 13px; color: var(--fg); cursor: pointer; user-select: none; }

/* ---------- 工具页 ---------- */
.tool-head { display: flex; align-items: center; gap: 14px; padding: 14px 20px 12px; border-bottom: 1px solid var(--border); background: var(--panel); flex-wrap: wrap; }
.tool-head h1 { font-size: 16px; margin: 0; font-weight: 650; }
.tool-head .desc { color: var(--muted); font-size: 13px; }
.tool-head .actions { margin-left: auto; display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.tool-body { flex: 1; min-height: 0; display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 0; }
.tool-body.single { grid-template-columns: minmax(0, 1fr); }
.tool-head .actions { min-width: 0; }
.app { grid-template-columns: var(--side-w) minmax(0, 1fr); }
.pane { display: flex; flex-direction: column; min-height: 0; min-width: 0; border-right: 1px solid var(--border); background: var(--panel); }
.pane:last-child { border-right: 0; }
.pane-head { display: flex; align-items: center; gap: 8px; padding: 8px 12px; border-bottom: 1px solid var(--border); font-size: 12.5px; color: var(--muted); min-height: 44px; flex-wrap: wrap; }
.pane-head .grow { flex: 1; }
.pane textarea.code { flex: 1; border: 0; resize: none; padding: 14px 16px; font: 13px/1.6 var(--mono); background: var(--panel); outline: none; tab-size: 4; font-variant-ligatures: none; }
.CodeMirror, .md-body code, .diff { font-variant-ligatures: none; }
.pane .scroll { flex: 1; overflow: auto; padding: 20px 28px; }
.pane .preview-frame { flex: 1; overflow: auto; padding: 24px 32px; }
.drop { margin: 18px; flex: 1; border: 1.5px dashed var(--border-strong); border-radius: 12px; display: grid; place-items: center; text-align: center; color: var(--muted); cursor: pointer; transition: .15s; padding: 24px; min-height: 180px; }
.drop:hover, .drop.over { border-color: var(--accent); background: var(--accent-soft); color: var(--accent); }
.drop strong { display: block; color: var(--fg); font-size: 15px; margin: 10px 0 4px; }
.drop svg { width: 34px; height: 34px; stroke: currentColor; fill: none; stroke-width: 1.5; }
.meta-line { font-size: 12px; color: var(--muted); display: flex; gap: 12px; flex-wrap: wrap; }
.meta-line b { color: var(--fg); font-weight: 600; }
.empty { color: var(--faint); padding: 40px; text-align: center; }
.progress { height: 3px; background: var(--border); overflow: hidden; }
.progress::after { content: ""; display: block; height: 100%; width: 35%; background: var(--accent); animation: slide 1.1s infinite ease-in-out; }
@keyframes slide { from { transform: translateX(-100%); } to { transform: translateX(300%); } }

/* ---------- 编辑器 ---------- */
.ed-toolbar { display: flex; align-items: center; gap: 8px; padding: 6px 10px; background: var(--panel); border-bottom: 1px solid var(--border); }
.ed-toolbar .tb-left { display: flex; align-items: center; gap: 2px; flex: 1; min-width: 0; overflow-x: auto; scrollbar-width: none; }
.ed-toolbar .sep { width: 1px; height: 18px; background: var(--border); margin: 0 6px; flex: none; }
.ed-toolbar .title-input { border: 0; background: transparent; font-weight: 600; font-size: 14px; width: 180px; padding: 4px 6px; border-radius: 6px; flex: none; }
.ed-toolbar .title-input:hover { background: var(--hover); }
.ed-toolbar .right { display: flex; gap: 6px; align-items: center; flex: none; }
.ed-wrap { flex: 1; min-height: 0; display: grid; grid-template-columns: 0 1fr 1fr; }
.ed-wrap.with-outline { grid-template-columns: 220px 1fr 1fr; }
.ed-wrap.mode-edit { grid-template-columns: 0 1fr 0; } .ed-wrap.mode-edit.with-outline { grid-template-columns: 220px 1fr 0; }
.ed-wrap.mode-preview { grid-template-columns: 0 0 1fr; } .ed-wrap.mode-preview.with-outline { grid-template-columns: 220px 0 1fr; }
.ed-outline { overflow: auto; border-right: 1px solid var(--border); background: var(--panel-2); padding: 10px 6px; font-size: 13px; }
.ed-outline .o-item { display: block; padding: 4px 8px; border-radius: 6px; color: var(--fg); cursor: pointer; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.ed-outline .o-item:hover { background: var(--hover); }
.ed-outline .o-item.cur { color: var(--accent); background: var(--accent-soft); }
.ed-outline .o-title { font-size: 11px; color: var(--faint); text-transform: uppercase; letter-spacing: .06em; padding: 2px 8px 8px; display: flex; justify-content: space-between; }
.ed-source { min-width: 0; min-height: 0; border-right: 1px solid var(--border); background: var(--panel); overflow: hidden; }
.ed-preview { min-width: 0; overflow: auto; background: var(--panel); }
.ed-preview .md-body { max-width: 860px; margin: 0 auto; padding: 28px 40px 50vh; }
.ed-status { display: flex; gap: 16px; align-items: center; padding: 0 14px; height: 28px; border-top: 1px solid var(--border); background: var(--panel); color: var(--muted); font-size: 12px; white-space: nowrap; overflow: hidden; }
.ed-status .grow { flex: 1; }
.save-dot { display: inline-flex; align-items: center; gap: 5px; }

.CodeMirror { height: 100%; font: 14px/1.7 var(--mono); background: var(--panel); color: var(--fg); }
.CodeMirror-lines { padding: 18px 0 50vh; }
.CodeMirror pre.CodeMirror-line, .CodeMirror pre.CodeMirror-line-like { padding: 0 22px; }
.CodeMirror-cursor { border-left: 2px solid var(--accent); }
.CodeMirror-activeline-background { background: color-mix(in srgb, var(--accent) 5%, transparent); }
.CodeMirror-selected, .CodeMirror-focused .CodeMirror-selected { background: color-mix(in srgb, var(--accent) 20%, transparent) !important; }
.CodeMirror-placeholder { color: var(--faint) !important; }
.cm-header { color: var(--fg); font-weight: 700; }
.cm-header-1 { font-size: 1.25em; } .cm-header-2 { font-size: 1.12em; }
.cm-strong { font-weight: 700; } .cm-em { font-style: italic; }
.cm-link, .cm-url { color: var(--accent) !important; } .cm-url { opacity: .75; }
.cm-comment { color: #b45309; background: color-mix(in srgb, var(--md-code-bg, #f3f4f6) 60%, transparent); }
.theme-dark .cm-comment { color: #f0b770; }
.cm-quote { color: var(--muted); font-style: italic; }
.cm-variable-2, .cm-variable-3, .cm-keyword { color: #7c3aed; } .theme-dark .cm-variable-2, .theme-dark .cm-keyword { color: #b49cff; }
.cm-hr, .cm-formatting { color: var(--faint); }
.cm-strikethrough { text-decoration: line-through; }
.cm-tag, .cm-attribute { color: #0891b2; } .cm-string { color: #15803d; } .theme-dark .cm-string { color: #7ee2a2; }
.cm-number, .cm-atom { color: #c2410c; }
.CodeMirror-dialog { background: var(--panel); border-color: var(--border) !important; }

/* ---------- 浮层 ---------- */
.menu { position: fixed; z-index: 50; background: var(--panel); border: 1px solid var(--border); border-radius: 10px; box-shadow: var(--shadow); padding: 5px; min-width: 200px; }
.menu button { display: flex; width: 100%; align-items: center; gap: 9px; border: 0; background: transparent; padding: 7px 10px; border-radius: 6px; cursor: pointer; text-align: left; font-size: 13px; }
.menu button:hover { background: var(--hover); }
.menu button small { margin-left: auto; color: var(--faint); font-size: 11.5px; }
.menu hr { border: 0; border-top: 1px solid var(--border); margin: 4px 0; }
.overlay { position: fixed; inset: 0; background: rgba(9,9,11,.35); z-index: 60; display: flex; align-items: flex-start; justify-content: center; padding-top: 12vh; }
.palette { width: min(560px, calc(100vw - 32px)); background: var(--panel); border: 1px solid var(--border); border-radius: 14px; box-shadow: var(--shadow); overflow: hidden; }
.palette input { width: 100%; border: 0; border-bottom: 1px solid var(--border); padding: 14px 16px; font-size: 15px; background: transparent; outline: none; }
.palette .list { max-height: 50vh; overflow: auto; padding: 6px; }
.palette .item { display: flex; align-items: center; gap: 10px; padding: 9px 10px; border-radius: 8px; cursor: pointer; }
.palette .item.sel { background: var(--accent-soft); color: var(--accent); }
.palette .item small { color: var(--muted); margin-left: auto; font-size: 12px; }
.toasts { position: fixed; bottom: 18px; left: 50%; transform: translateX(-50%); z-index: 70; display: flex; flex-direction: column; gap: 8px; align-items: center; pointer-events: none; }
.toast { background: var(--fg); color: var(--panel); padding: 8px 14px; border-radius: 9px; font-size: 13px; box-shadow: var(--shadow); animation: pop .18s ease-out; max-width: 80vw; }
.toast.err { background: var(--err); color: #fff; }
@keyframes pop { from { opacity: 0; transform: translateY(6px); } }
.dropzone-cover { position: fixed; inset: 0; background: color-mix(in srgb, var(--accent) 12%, transparent); border: 3px dashed var(--accent); z-index: 80; display: grid; place-items: center; font-size: 18px; color: var(--accent); font-weight: 600; pointer-events: none; }

/* ---------- 表格编辑器 / 检查 / 对比 ---------- */
.grid-wrap { flex: 1; overflow: auto; padding: 16px; }
table.grid { border-collapse: collapse; font-size: 13px; }
table.grid td, table.grid th { border: 1px solid var(--border); padding: 0; min-width: 110px; position: relative; }
table.grid th { background: var(--panel-2); }
table.grid [contenteditable] { padding: 6px 9px; outline: none; min-height: 30px; }
table.grid [contenteditable]:focus { box-shadow: inset 0 0 0 2px var(--accent); }
table.grid .rowtool { min-width: 30px; width: 30px; text-align: center; color: var(--faint); font-size: 11px; background: var(--panel-2); }
table.grid .align-row td { background: var(--panel-2); text-align: center; }
.issue { display: flex; gap: 10px; padding: 9px 14px; border-bottom: 1px solid var(--border); cursor: pointer; font-size: 13px; align-items: baseline; }
.issue:hover { background: var(--hover); }
.issue .ln { font: 12px var(--mono); color: var(--muted); min-width: 52px; }
.issue .rule { font: 11px var(--mono); color: var(--accent); border: 1px solid currentColor; border-radius: 4px; padding: 0 4px; }
.issue .fx { margin-left: auto; font-size: 11px; color: var(--ok); }
.rules { display: flex; flex-wrap: wrap; gap: 6px 14px; padding: 10px 14px; border-bottom: 1px solid var(--border); }
.diff { font: 13px/1.6 var(--mono); white-space: pre-wrap; padding: 12px 0; }
.diff div { padding: 0 14px; }
.diff .add { background: color-mix(in srgb, var(--ok) 14%, transparent); }
.diff .del { background: color-mix(in srgb, var(--err) 14%, transparent); text-decoration: line-through; text-decoration-color: color-mix(in srgb, var(--err) 50%, transparent); }
.diff .ln { display: inline-block; width: 36px; color: var(--faint); user-select: none; }
.wx-frame { background: #fff; color: #333; max-width: 600px; margin: 0 auto; padding: 24px 18px; min-height: 100%; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 12px; padding: 20px; overflow: auto; align-content: start; }
.card { border: 1px solid var(--border); border-radius: 12px; padding: 14px; background: var(--panel); cursor: pointer; transition: .12s; }
.card:hover { border-color: var(--accent); transform: translateY(-1px); }
.card h3 { margin: 0 0 4px; font-size: 14px; }
.card p { margin: 0; color: var(--muted); font-size: 12.5px; }

@media (max-width: 900px) {
  .app { grid-template-columns: 0 minmax(0, 1fr); }
  .app.side-open { grid-template-columns: var(--side-w) minmax(0, 1fr); }
  .tool-body { grid-template-columns: minmax(0, 1fr); }
  .brand { min-width: 0; } .brand span { display: none; }
  .engine-pill { display: none; }
  .tool-body { grid-template-columns: 1fr; grid-template-rows: 1fr 1fr; }
  .pane { border-right: 0; border-bottom: 1px solid var(--border); }
  .ed-wrap, .ed-wrap.with-outline { grid-template-columns: 0 1fr 0; }
  .ed-wrap.mode-preview, .ed-wrap.mode-preview.with-outline { grid-template-columns: 0 0 1fr; }
  .ed-toolbar .title-input { width: 110px; }
  /* 手机：操作按钮一行，格式按钮单独一行横向滑动（否则会被挤到 0 宽） */
  .ed-toolbar { flex-wrap: wrap; row-gap: 4px; }
  .ed-toolbar .right { width: 100%; justify-content: flex-end; }
  .ed-toolbar .tb-left { flex-basis: 100%; order: 2; }
  .ed-toolbar [data-cmd="outline"], .ed-toolbar [data-cmd="focus"] { display: none; }
  .tool-head { padding: 10px 14px; gap: 8px; }
  .tool-head .desc { display: none; }
}

/* ---------- 功能图标 ---------- */
.app-ico { width: var(--s); height: var(--s); flex: none; display: inline-grid; place-items: center; border-radius: calc(var(--s) * .26);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,.12), 0 1px 2px rgba(0,0,0,.12); }
.app-ico svg, .nav-item .app-ico svg, .palette .item .app-ico svg { width: 64%; height: 64%; stroke: none; fill: none; }
.app-ico.sm { border-radius: 6px; box-shadow: none; }
.nav-item { gap: 10px; padding: 6px 10px; }

/* ---------- 首页 ---------- */
.home { overflow: auto; background: var(--bg); }
.home-inner { max-width: 1120px; margin: 0 auto; padding: 32px 28px 64px; }
.home-hero { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr); gap: 24px; align-items: stretch; }
.hero-main h1 { font-size: 30px; line-height: 1.2; margin: 6px 0 10px; letter-spacing: -.02em; }
.hero-sub { color: var(--muted); font-size: 15px; margin: 0 0 20px; max-width: 34em; line-height: 1.7; }
.hero-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.btn.big { height: 40px; padding: 0 18px; font-size: 14px; border-radius: 10px; text-decoration: none; }
.btn.primary { color: var(--accent-fg); }
.recent { margin-top: 22px; display: flex; flex-direction: column; gap: 2px; max-width: 460px; }
.recent-title { font-size: 12px; color: var(--faint); letter-spacing: .04em; margin-bottom: 4px; }
.recent-item { display: flex; align-items: center; gap: 10px; border: 0; background: transparent; padding: 7px 8px; border-radius: 8px; cursor: pointer; text-align: left; color: var(--fg); }
.recent-item:hover { background: var(--hover); }
.recent-item svg { width: 16px; height: 16px; stroke: var(--muted); fill: none; stroke-width: 1.8; flex: none; }
.recent-item span { flex: 1; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.recent-item small { color: var(--faint); font-size: 12px; }
.hero-drop { border: 1.5px dashed var(--border-strong); border-radius: 16px; background: var(--panel); display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 8px; padding: 28px 20px; text-align: center; cursor: pointer; transition: .15s; color: var(--muted); }
.hero-drop strong { color: var(--fg); font-size: 16px; margin-top: 6px; }
.hero-drop span { font-size: 13px; }
.hero-drop small { font-size: 12px; color: var(--faint); }
.hero-drop:hover, .hero-drop.over { border-color: var(--accent); background: var(--accent-soft); }
.hero-drop.over { transform: scale(1.01); }
.home-search { margin: 32px 0 8px; display: flex; align-items: center; gap: 10px; height: 46px; padding: 0 16px;
  border: 1px solid var(--border); border-radius: 12px; background: var(--panel); }
.home-search:focus-within { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent); }
.home-search svg { width: 18px; height: 18px; stroke: var(--faint); fill: none; stroke-width: 2; flex: none; }
.home-search input { flex: 1; border: 0; background: transparent; outline: none; font-size: 15px; min-width: 0; }
.home-group { margin-top: 28px; }
.group-head { display: flex; align-items: baseline; gap: 12px; margin-bottom: 12px; flex-wrap: wrap; }
.group-head h2 { font-size: 17px; margin: 0; }
.group-head span { font-size: 13px; color: var(--muted); }
.tool-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 12px; }
.tool-card { display: flex; align-items: center; gap: 14px; padding: 16px; background: var(--panel); border: 1px solid var(--border);
  border-radius: 14px; text-decoration: none; color: var(--fg); transition: transform .12s, box-shadow .12s, border-color .12s; }
.tool-card:hover { transform: translateY(-2px); border-color: var(--border-strong); box-shadow: var(--shadow); }
.tool-card:focus-visible { outline-offset: 2px; }
.tc-text { display: flex; flex-direction: column; gap: 3px; min-width: 0; }
.tc-title { font-weight: 650; font-size: 15px; display: flex; align-items: center; gap: 6px; }
.tc-title em { font-style: normal; font-size: 10.5px; font-weight: 600; color: #be123c; background: #ffe4e6; border-radius: 99px; padding: 1px 7px; }
.theme-dark .tc-title em { color: #fda4af; background: #4c0519; }
.tc-desc { font-size: 12.5px; color: var(--muted); line-height: 1.5; }
.home-empty { color: var(--muted); text-align: center; padding: 40px 0; }
@media (max-width: 900px) {
  .home-inner { padding: 20px 16px 48px; }
  .home-hero { grid-template-columns: minmax(0, 1fr); }
  .hero-main h1 { font-size: 24px; }
  .hero-drop { padding: 20px 16px; }
  .tool-grid { grid-template-columns: minmax(0, 1fr); gap: 10px; }
  .tool-card { padding: 13px 14px; }
}
@media (max-width: 600px) {
  /* 手机无法拖放文件，「打开文件」按钮已覆盖 */
  .hero-drop { display: none; }
  .home-search { margin-top: 22px; }
}

/* ---------- 关于我们 / 商务合作 ---------- */
.about { overflow: auto; background: var(--bg); }
.about-inner { max-width: 860px; margin: 0 auto; padding: 36px 28px 56px; display: flex; flex-direction: column; gap: 18px; }
.about-hero { display: flex; gap: 18px; align-items: flex-start; }
.about-hero h1 { margin: 2px 0 8px; font-size: 26px; letter-spacing: -.01em; }
.about-hero p { margin: 0; color: var(--muted); font-size: 15px; line-height: 1.75; }
.about-card { background: var(--panel); border: 1px solid var(--border); border-radius: 14px; padding: 22px 24px; }
.about-card h2 { font-size: 17px; margin: 0 0 12px; }
.about-card p { color: var(--muted); margin: 0 0 14px; line-height: 1.7; }
.about-points { margin: 0; padding-left: 1.2em; line-height: 1.9; }
.about-points b { color: var(--fg); }
.biz-head { display: flex; align-items: center; gap: 12px; margin-bottom: 10px; }
.biz-head h2 { margin: 0; }
.biz-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
.biz-grid div { display: flex; flex-direction: column; gap: 4px; padding: 12px 14px; border: 1px solid var(--border); border-radius: 10px; background: var(--panel-2); }
.biz-grid b { font-size: 14px; }
.biz-grid span { font-size: 12.5px; color: var(--muted); line-height: 1.6; }
.contact-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.contact-mail { display: inline-flex; align-items: center; gap: 8px; font-size: 16px; font-weight: 600; margin-right: 6px; }
.contact-mail svg, .contact-row .btn svg { width: 17px; height: 17px; stroke: currentColor; fill: none; stroke-width: 1.8; }
.contact-mail a { color: var(--accent); text-decoration: none; }
.contact-row .btn { text-decoration: none; }
.about-foot { color: var(--faint); font-size: 12.5px; text-align: center; margin-top: 6px; }
.about-foot a { color: var(--muted); }
.home-foot { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; margin-top: 44px; padding-top: 18px; border-top: 1px solid var(--border); color: var(--faint); font-size: 12.5px; }
.home-foot a { color: var(--muted); text-decoration: none; }
.home-foot a:hover { color: var(--accent); }
.home-foot .grow { flex: 1; }
.nav-foot { margin-top: 18px; padding-top: 10px; border-top: 1px solid var(--border); }
@media (max-width: 700px) {
  .about-inner { padding: 22px 16px 40px; }
  .about-hero { flex-direction: column; gap: 12px; }
  .biz-grid { grid-template-columns: minmax(0, 1fr); }
}

/* ---------- 使用引导：步骤条 + 下一步高亮 ---------- */
.guide { display: flex; align-items: center; gap: 8px 16px; padding: 8px 14px 8px 20px; background: var(--panel-2); border-bottom: 1px solid var(--border); font-size: 13px; color: var(--muted); flex-wrap: wrap; }
.guide .steps { display: flex; flex-wrap: wrap; align-items: center; gap: 6px 2px; min-width: 0; }
.guide .step { display: inline-flex; align-items: center; gap: 7px; padding: 3px 10px 3px 3px; border-radius: 999px; transition: background .2s, color .2s; }
.guide .step b { flex: none; width: 20px; height: 20px; border-radius: 50%; display: grid; place-items: center; font-size: 11.5px; font-weight: 650; background: var(--hover); color: var(--muted); }
.guide .step em { font-style: normal; font-size: 11px; color: var(--faint); border: 1px solid var(--border); border-radius: 4px; padding: 0 4px; margin-left: 6px; }
.guide .step.opt b { background: transparent; border: 1px dashed var(--border-strong); }
.guide .step.on { background: var(--accent-soft); color: var(--fg); }
.guide .step.on > span { font-weight: 600; }
.guide .step.on b { background: var(--accent); color: var(--accent-fg); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 22%, transparent); }
.guide .step.done b { background: color-mix(in srgb, var(--ok) 14%, transparent); color: var(--ok); font-size: 0; }
.guide .step.done b::after { content: '✓'; font-size: 12px; }
.guide .sep { font-style: normal; color: var(--faint); padding: 0 2px; }
.guide-tip { display: flex; align-items: center; gap: 6px; margin: 0 0 0 auto; color: var(--muted); font-size: 12.5px; }
.guide-tip svg { flex: none; width: 15px; height: 15px; stroke: var(--warn); fill: none; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.guide-x { flex: none; border: 0; background: transparent; color: var(--faint); cursor: pointer; padding: 5px; border-radius: 6px; display: grid; }
.guide-tip + .guide-x { margin-left: 0; }
.guide .steps + .guide-x { margin-left: auto; }
.guide-x svg { width: 14px; height: 14px; stroke: currentColor; fill: none; stroke-width: 2; }
.guide-x:hover { background: var(--hover); color: var(--fg); }
.guide-open { display: none; color: var(--muted); }
.view.guide-folded .guide { display: none; }
.view.guide-folded .guide-open { display: inline-flex; }

/* 下一步该操作的位置：按钮呼吸光圈，输入区虚线框 + 淡底色 */
.btn.cue { animation: cue-pulse 1.8s ease-out infinite; }
.btn.cue:not(.primary) { border-color: var(--accent); color: var(--accent); background: var(--accent-soft); }
@keyframes cue-pulse {
  0% { box-shadow: 0 0 0 0 color-mix(in srgb, var(--accent) 50%, transparent); }
  70%, 100% { box-shadow: 0 0 0 9px color-mix(in srgb, var(--accent) 0%, transparent); }
}
.drop.cue { border: 2px dashed var(--accent); background: var(--accent-soft); animation: cue-breathe 2.6s ease-in-out infinite; }
.drop.cue > div > svg, .drop.cue strong { color: var(--accent); }
.pane .cue:not(.btn):not(.drop), .grid-wrap.cue { outline: 2px dashed color-mix(in srgb, var(--accent) 65%, transparent); outline-offset: -7px; background-color: color-mix(in srgb, var(--accent) 3%, var(--panel)); border-radius: 12px; }
.pane .cue:not(.btn):not(.drop):focus, .pane .cue:focus-within { outline-style: solid; outline-color: color-mix(in srgb, var(--accent) 45%, transparent); }
.pane.cue { outline-offset: -5px; }
.pane.cue [contenteditable] { background: transparent; }
input.input.cue { border-color: var(--accent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 18%, transparent); }
@keyframes cue-breathe { 50% { background: color-mix(in srgb, var(--accent) 3%, var(--panel)); } }
.wx-empty { color: #999; text-align: center; padding: 60px 10px; font-size: 14px; }

@media (max-width: 900px) {
  .guide { padding: 8px 10px 8px 14px; }
  .guide-tip { flex-basis: 100%; order: 3; margin: 0; }
  .guide .steps { flex: 1; }
}
@media (max-width: 600px) {
  /* 手机上只展开当前一步的文字，其余显示序号 */
  .guide .step:not(.on) > span { display: none; }
  .guide .step:not(.on) { padding-right: 3px; }
  .guide .steps { flex-wrap: nowrap; }
  .guide .step.on { min-width: 0; }
  .guide .step.on > span { white-space: normal; }
}

/* 首页：三步上手 */
.home-steps { display: flex; flex-wrap: wrap; gap: 8px; margin: 14px 0 0; padding: 0; list-style: none; font-size: 13px; color: var(--muted); }
.home-steps li { display: inline-flex; align-items: center; gap: 7px; padding: 4px 12px 4px 4px; border-radius: 999px; background: var(--panel); border: 1px solid var(--border); }
.home-steps b { width: 20px; height: 20px; border-radius: 50%; display: grid; place-items: center; font-size: 11.5px; background: var(--accent-soft); color: var(--accent); }