/* Commafield — a spreadsheet-like workbench. System fonts only. */
:root {
  --paper: #eef1f4;
  --paper-2: #e1e6ec;
  --sheet: #ffffff;
  --sheet-2: #f6f8fa;
  --ink: #15202b;
  --ink-2: #4b5967;
  --rule: #d4dbe2;
  --rule-soft: #e7ecf0;
  --rule-strong: #a9b4bf;
  --brand: #26382e;
  --brand-soft: #d6e7d2;
  --focus: #1f6feb;
  --del: #b42318; --del-bg: #fdeeec; --del-ink: #8a1c13;
  --trim: #8a5300; --trim-bg: #fff2d3; --trim-mark: #8a5300;
  --add: #12703a; --add-bg: #e6f5ec;
  --chg: #1747a6; --chg-bg: #e7eefb;
  --ui: "Avenir Next", "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", "SFMono-Regular", Menlo, Consolas, "Liberation Mono", monospace;
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 16px/1.55 var(--ui); }
a { color: inherit; text-underline-offset: 3px; }
button, input, select, textarea { font: inherit; color: inherit; }
code, .mono { font-family: var(--mono); font-size: .92em; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }
.visually-hidden { position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0; }
.skip { position: absolute; left: 12px; top: -60px; background: var(--ink); color: #fff; padding: 10px 14px; z-index: 20; }
.skip:focus { top: 12px; }
[hidden] { display: none !important; }

/* ---------- top bar ---------- */
.bar { display: flex; align-items: center; gap: 28px; padding: 0 32px; min-height: 58px; border-bottom: 1px solid var(--rule); background: var(--paper); }
.brand { display: inline-flex; align-items: center; gap: 9px; font-weight: 700; font-size: 20px; letter-spacing: -.01em; text-decoration: none; }
.brand-mark { display: inline-grid; place-items: center; width: 30px; height: 30px; border-radius: 6px; background: var(--brand); color: var(--brand-soft); font: 700 17px/1 var(--mono); letter-spacing: -.12em; padding-bottom: 6px; }
.brand-dot { color: #3d7a55; }
.brand.small { font-size: 17px; }
.bar-nav { display: flex; gap: 22px; font-size: 15px; }
.bar-nav a { text-decoration: none; color: var(--ink-2); padding: 8px 0; }
.bar-nav a:hover { color: var(--ink); text-decoration: underline; }
.bar-note { margin: 0 0 0 auto; font-size: 14px; color: var(--ink-2); display: flex; align-items: center; gap: 8px; }
.lock { width: 10px; height: 10px; border-radius: 50%; background: #2f8a55; box-shadow: 0 0 0 3px #d4ecdc; }

/* ---------- intro ---------- */
.intro { padding: 20px 32px 16px; display: flex; align-items: baseline; gap: 12px 36px; flex-wrap: wrap; }
h1 { margin: 0; font-size: 34px; line-height: 1.15; font-weight: 700; letter-spacing: -.02em; }
.lede { margin: 0; max-width: 72ch; color: var(--ink-2); font-size: 17px; }

/* ---------- workbench ---------- */
.bench { margin: 0 32px; }
.modes { display: flex; gap: 4px; align-items: flex-end; }
.mode { appearance: none; border: 1px solid var(--rule); border-bottom: 0; background: var(--paper-2); color: var(--ink-2); padding: 8px 22px 10px; min-height: 52px; font-size: 16px; font-weight: 600; cursor: pointer; text-align: left; display: flex; flex-direction: column; line-height: 1.25; border-radius: 4px 4px 0 0; position: relative; }
.mode:hover { color: var(--ink); background: #eaeef2; }
.mode[aria-selected="true"] { background: var(--sheet); color: var(--ink); z-index: 1; margin-bottom: -1px; padding-bottom: 11px; box-shadow: inset 0 3px 0 var(--ink); }
.mode-k { font: 600 12px/1.4 var(--mono); letter-spacing: .04em; text-transform: uppercase; color: var(--ink-2); }
.panel { display: grid; grid-template-columns: 318px minmax(0, 1fr); background: var(--sheet); border: 1px solid var(--rule); min-height: 560px; }
.panel.dragover { outline: 3px dashed var(--chg); outline-offset: -3px; }

/* sidebar */
.side { border-right: 1px solid var(--rule); background: var(--sheet); }
.block { padding: 16px 20px 18px; border-bottom: 1px solid var(--rule); }
.block:last-child { border-bottom: 0; }
.block-h { margin: 0 0 10px; font-size: 13px; font-weight: 700; letter-spacing: .07em; text-transform: uppercase; color: var(--ink-2); display: flex; align-items: center; gap: 8px; }
.source.dragover { background: var(--chg-bg); outline: 2px dashed var(--chg); outline-offset: -4px; }
.file-chip { display: flex; flex-wrap: wrap; align-items: baseline; gap: 2px 8px; margin-bottom: 12px; }
.file-chip b { font: 600 15px/1.4 var(--mono); word-break: break-all; }
.file-meta { flex-basis: 100%; font-size: 13px; color: var(--ink-2); }
.sample-tag { font: 700 12px/1 var(--ui); letter-spacing: .05em; text-transform: uppercase; color: var(--chg); background: var(--chg-bg); border: 1px dashed #8eaae0; padding: 4px 6px; }
.ab { display: inline-grid; place-items: center; width: 24px; height: 24px; font: 700 13px/1 var(--mono); color: #fff; border-radius: 3px; }
.ab-a { background: var(--del); }
.ab-b { background: var(--add); }
.src-actions { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.btn { appearance: none; display: inline-flex; align-items: center; justify-content: center; min-height: 40px; padding: 0 14px; border: 1px solid var(--rule-strong); background: var(--sheet); border-radius: 3px; font-size: 15px; font-weight: 600; cursor: pointer; text-decoration: none; }
.btn:hover { background: var(--sheet-2); border-color: var(--ink-2); }
.btn.quiet { border-color: transparent; text-decoration: underline; text-underline-offset: 3px; padding: 0 8px; }
.btn.quiet:hover { background: var(--paper); }
.btn.dark, .btn.primary { background: var(--ink); color: #fff; border-color: var(--ink); }
.btn.dark:hover, .btn.primary:hover { background: #2b3947; }
.btn.primary { width: 100%; min-height: 46px; font-size: 16px; gap: .3em; }
.btn:disabled { background: var(--paper-2); color: #707d8a; border-color: var(--rule); cursor: not-allowed; }
input[type="file"].visually-hidden:focus-visible + .btn, .btn:has(+ input:focus-visible) { outline: 3px solid var(--focus); outline-offset: 2px; }
.paste { margin-bottom: 12px; display: grid; gap: 8px; }
.paste label { font-size: 14px; font-weight: 600; }
.paste textarea { width: 100%; font: 14px/1.5 var(--mono); border: 1px solid var(--rule-strong); border-radius: 3px; padding: 8px; resize: vertical; }
.field { display: grid; gap: 4px; font-size: 14px; font-weight: 600; color: var(--ink); }
.field select { min-height: 40px; border: 1px solid var(--rule-strong); border-radius: 3px; background: var(--sheet); padding: 0 10px; font-weight: 400; font-size: 15px; }
.opts { margin-bottom: 4px; }
.opts summary { cursor: pointer; display: inline-flex; align-items: center; min-height: 40px; font-size: 14px; font-weight: 600; color: var(--ink-2); }
.opts summary::-webkit-details-marker { display: none; }
.opts summary::before { content: "▸"; display: inline-block; width: 16px; color: var(--ink-2); }
.opts[open] summary::before { content: "▾"; }
.opts[open] summary { margin-bottom: 6px; }
.cmp-files { display: none; margin: 0; padding: 10px 12px; font-size: 14px; border-bottom: 1px solid var(--rule); background: var(--sheet-2); }
.cmp-files b { font-family: var(--mono); font-weight: 600; word-break: break-all; }
.drop-hint { margin: 10px 0 0; font-size: 13px; color: var(--ink-2); }
.fine { margin: 8px 0 0; font-size: 13px; line-height: 1.45; color: var(--ink-2); }
.field.inline { grid-template-columns: auto minmax(0, 1fr); align-items: center; gap: 10px; }
.sheet-bar .field.inline { grid-template-columns: auto auto; font-size: 15px; }
.sheet-bar .fine { margin: 0; }
.bar-actions { margin-left: auto; display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px; }
.bar-actions .btn.primary { width: auto; min-height: 44px; padding: 0 20px; }
.legend-row { display: flex; flex-wrap: wrap; align-items: center; gap: 8px 20px; padding: 8px 14px; border-bottom: 1px solid var(--rule); }
.legend-row .fine { margin: 0 0 0 auto; }
.legend-row .legend { margin: 0; }
.samples .fine { margin: 0 0 6px; }

/* steps */
.step { display: grid; grid-template-columns: 22px 1fr auto; align-items: center; gap: 10px; min-height: 46px; padding: 4px 0; border-bottom: 1px solid var(--rule-soft); cursor: pointer; font-size: 15px; font-weight: 600; }
.step input, .check input { width: 18px; height: 18px; margin: 0; accent-color: var(--ink); }
.count { font: 600 13px/1 var(--mono); padding: 5px 7px; border-radius: 2px; background: var(--paper); color: var(--ink-2); white-space: nowrap; }
.s-trim .count.hit { background: var(--trim-bg); color: var(--trim); box-shadow: inset 0 0 0 1px #e8c37a; }
.s-blank .count.hit, .s-dup .count.hit { background: var(--del-bg); color: var(--del-ink); box-shadow: inset 0 0 0 1px #f0b8b1; }
.sub { padding: 10px 0 0 32px; display: grid; gap: 10px; }
.sub.off { opacity: .55; }
.check { display: flex; align-items: center; gap: 10px; min-height: 40px; font-size: 15px; cursor: pointer; }
.check.inline { min-height: 40px; }

/* sheet */
.sheet { display: flex; flex-direction: column; min-width: 0; }
.sheet-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 18px; padding: 10px 14px; border-bottom: 1px solid var(--rule); background: var(--sheet-2); }
.seg { display: inline-flex; border: 1px solid var(--rule-strong); border-radius: 3px; overflow: hidden; }
.seg-b { appearance: none; border: 0; background: var(--sheet); min-height: 40px; padding: 0 14px; font-size: 15px; font-weight: 600; cursor: pointer; }
.seg-b + .seg-b { border-left: 1px solid var(--rule-strong); }
.seg-b[aria-pressed="true"] { background: var(--ink); color: #fff; }
.legend { list-style: none; display: flex; flex-wrap: wrap; gap: 6px 16px; margin: 0; padding: 0; font-size: 13px; color: var(--ink-2); }
.legend li { display: flex; align-items: center; gap: 6px; }
.sw { display: inline-block; width: 14px; height: 14px; border: 1px solid; }
.sw-del { background: var(--del-bg); border-color: var(--del); }
.sw-trim { background: var(--trim-bg); border-color: var(--trim-mark); }
.sw-pad { background: #fff; border: 1px dashed #6f7d8b; }
.sw-chg { background: var(--chg-bg); border-color: var(--chg); }
.legend del, .grid del { color: var(--del); }
.legend ins, .grid ins { color: var(--add); text-decoration: none; font-weight: 700; }

.filters { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { appearance: none; min-height: 40px; padding: 0 12px; border: 1px solid var(--rule-strong); background: var(--sheet); border-radius: 3px; font-size: 15px; font-weight: 600; cursor: pointer; display: inline-flex; align-items: center; gap: 8px; }
.chip b { font: 600 13px/1 var(--mono); padding: 4px 6px; background: var(--paper); border-radius: 2px; }
.chip.f-chg b { background: var(--chg-bg); color: var(--chg); }
.chip.f-a b { background: var(--del-bg); color: var(--del-ink); }
.chip.f-b b { background: var(--add-bg); color: var(--add); }
.chip[aria-pressed="true"] { background: var(--ink); border-color: var(--ink); color: #fff; }
.chip[aria-pressed="true"] b { background: #fff; color: var(--ink); }

.notices:not(:empty) { padding: 10px 14px; display: grid; gap: 8px; border-bottom: 1px solid var(--rule); }
.notice { padding: 9px 12px; border-left: 4px solid; font-size: 15px; line-height: 1.45; }
.n-error { background: var(--del-bg); border-color: var(--del); color: var(--del-ink); }
.n-warn { background: var(--trim-bg); border-color: var(--trim-mark); color: #5e3a00; }
.n-info { background: #eef2f6; border-color: #8696a6; color: #2c3a47; }

.grid-wrap { overflow: auto; max-height: min(64vh, 640px); flex: 1 1 auto; }
.grid { border-collapse: separate; border-spacing: 0; min-width: 100%; font: 15px/1.4 var(--mono); }
.grid th { position: sticky; top: 0; z-index: 2; background: #eef2f5; font: 700 14px/1.3 var(--ui); text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--rule-strong); border-right: 1px solid var(--rule); white-space: nowrap; }
.grid td { padding: 8px 12px; border-bottom: 1px solid var(--rule-soft); border-right: 1px solid var(--rule-soft); white-space: nowrap; max-width: 300px; overflow: hidden; text-overflow: ellipsis; vertical-align: top; }
.grid .ln { position: sticky; left: 0; z-index: 1; background: var(--sheet-2); color: var(--ink-2); text-align: right; font: 13px/1.6 var(--mono); width: 1%; border-right: 1px solid var(--rule); }
.grid th.ln { z-index: 3; background: #e6ebf0; font: 700 13px/1.3 var(--ui); }
.grid .st { font: 13px/1.5 var(--ui); width: 1%; }
.grid th.st { font: 700 14px/1.3 var(--ui); }
.tag { display: inline-block; padding: 2px 8px; border-radius: 2px; font-weight: 600; white-space: nowrap; }
.grid td.empty { text-align: center; padding: 48px 16px; color: var(--ink-2); font: 16px/1.5 var(--ui); white-space: normal; }
.grid tbody tr:hover td { background-image: linear-gradient(rgba(21,32,43,.035), rgba(21,32,43,.035)); }

/* clean marks */
.r-del td { background-color: var(--del-bg); color: var(--del-ink); }
.r-del td:not(.ln):not(.st) { text-decoration: line-through; text-decoration-color: rgba(180,35,24,.6); }
.r-del .tag { background: var(--del); color: #fff; }
.r-chg .tag { background: var(--trim-bg); color: var(--trim); box-shadow: inset 0 0 0 1px #e8c37a; }
.r-err td { background-color: #fbe1dd; color: var(--del-ink); }
.r-err .tag { background: #fff; color: var(--del); box-shadow: inset 0 0 0 2px var(--del); }
td.trim { background-color: var(--trim-bg); box-shadow: inset 0 -2px 0 var(--trim-mark); }
.ws { color: var(--trim-mark); background: rgba(224,160,48,.22); font-weight: 700; letter-spacing: .05em; }
.r-del .ws { color: inherit; background: rgba(180,35,24,.1); }
td.pad { background: repeating-linear-gradient(135deg, #fff 0 6px, #f1f4f7 6px 12px); box-shadow: inset 0 0 0 1px #9aa7b4; }
.nl { color: #6b7a89; padding: 0 3px; }
.grid .xcol { background-color: #fff6f4; }
th.xcol { color: var(--del); }
.grid.result td { color: var(--ink); }

/* compare marks */
.r-add td { background-color: var(--add-bg); }
.r-add .tag { background: var(--add); color: #fff; }
.r-chg td.chg { background-color: var(--chg-bg); }
.grid .key { font-weight: 700; }
.r-same td { color: var(--ink-2); }
.r-same .tag { background: var(--paper); color: var(--ink-2); }
#compare-table .r-chg .tag { background: var(--chg-bg); color: var(--chg); box-shadow: inset 0 0 0 1px #a9c0ec; }
td.chg del { background: #fbdcd8; padding: 1px 4px; }
td.chg ins { background: #d3efdd; padding: 1px 4px; }
.arrow { color: var(--ink-2); padding: 0 6px; }

.more { margin: 0; padding: 8px 14px; font-size: 14px; color: #5e3a00; background: var(--trim-bg); border-top: 1px solid #ecd39f; }
.status { display: flex; flex-wrap: wrap; gap: 4px 0; padding: 10px 14px; border-top: 1px solid var(--rule); background: var(--sheet-2); font-size: 14px; color: var(--ink-2); }
.status span { padding: 0 14px; border-left: 1px solid var(--rule); }
.status span:first-child { padding-left: 0; border-left: 0; }
.status .strong { color: var(--ink); font-weight: 700; }

/* ---------- below the workbench ---------- */
.facts, .faq, .guide-link { margin: 0 32px; padding: 52px 0 8px; }
.facts h2, .faq h2 { font-size: 24px; letter-spacing: -.01em; margin: 0 0 20px; }
.facts-grid { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 0; border-top: 2px solid var(--ink); }
.facts-grid > div { padding: 18px 28px 8px 0; }
.facts-grid > div + div { padding-left: 28px; border-left: 1px solid var(--rule); }
.facts h3 { margin: 0 0 10px; font-size: 17px; }
.facts p { margin: 0; color: var(--ink-2); }
.ticks { margin: 0; padding: 0; list-style: none; }
.ticks li { padding: 5px 0 5px 22px; position: relative; color: #2c3a47; }
.ticks li::before { content: ","; position: absolute; left: 4px; top: 0; font: 700 22px/1.2 var(--mono); color: #3d7a55; }
.faq { max-width: 980px; }
.faq details { border-top: 1px solid var(--rule); }
.faq details:last-of-type { border-bottom: 1px solid var(--rule); }
.faq summary { cursor: pointer; padding: 14px 0; font-weight: 600; font-size: 17px; min-height: 44px; }
.faq p { margin: 0 0 16px; color: #2c3a47; max-width: 75ch; }
.guide-link { padding-bottom: 56px; }
.kicker { margin: 0; font: 600 13px/1.4 var(--mono); letter-spacing: .06em; text-transform: uppercase; color: var(--ink-2); }
.guide-link h2 { margin: 6px 0; font-size: 24px; }
.guide-link p:last-child { margin: 0; color: var(--ink-2); max-width: 70ch; }

.foot { display: flex; flex-wrap: wrap; align-items: center; gap: 10px 22px; padding: 22px 32px 30px; border-top: 1px solid var(--rule); font-size: 15px; color: var(--ink-2); }
.foot > a { padding: 8px 0; }
.tw-xlinks { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-left: auto; }
.tw-xlinks a { padding: 8px 0; }

/* ---------- responsive ---------- */
/* 2026-10-21: encoding picker, compare options, formula count */
.opts .field + .field { margin-top: 8px; }
.opts select { width: 100%; min-width: 0; }
.opts select:disabled { opacity: .6; }
.sub select { width: 100%; min-width: 0; }
.cmp-opts { display: flex; flex-wrap: wrap; gap: 0 18px; flex-basis: 100%; }
.cmp-opts .check { min-height: 32px; font-size: 14px; }
.guard-count { margin-top: 6px; }
.panel.busy .grid-wrap, .panel.busy .status { opacity: .55; transition: opacity .12s; }
.panel.busy { cursor: progress; }
.guard-count.hit { color: var(--ink); font-weight: 600; }
/* First paint for visitors who last used Compare (set by the <head> script, removed by the page script once the tabs are set). */
html.cf-compare #clean-panel { display: none !important; }
html.cf-compare #compare-panel[hidden] { display: grid !important; }
html.cf-compare #compare-tab { background: var(--sheet); color: var(--ink); z-index: 1; margin-bottom: -1px; padding-bottom: 11px; box-shadow: inset 0 3px 0 var(--ink); }
html.cf-compare #clean-tab { background: var(--paper-2); color: var(--ink-2); z-index: auto; margin-bottom: 0; padding-bottom: 10px; box-shadow: none; }

@media (max-width: 1100px) {
  /* 导航不再整块隐藏：1024 / 900 / 768 的笔记本与平板上，三个指南页原本从头栏消失。 */
  .bar-nav { flex-wrap: nowrap; overflow-x: auto; overflow-y: hidden; scrollbar-width: none; gap: 16px; min-width: 0; }
  .bar-nav a { flex: 0 0 auto; white-space: nowrap; }
  .bar-nav::-webkit-scrollbar { width: 0; height: 0; }
  .bar-note { margin-left: auto; }
}

@media (max-width: 900px) {
  /* 窄屏把信任声明放到品牌同一行、导航单独一行：头栏由三行压回两行。 */
  .bar-nav { flex: 1 1 100%; order: 2; }
  .bar-note { order: 1; margin: 0 0 0 auto; flex: 0 1 auto; }
}

@media (max-width: 640px) {
  .bar-note { flex: 1 1 100%; margin: 0; }
}
@media (max-width: 900px) {
  .panel { display: flex; flex-direction: column; }
  .side { display: contents; }
  .block { border-bottom: 1px solid var(--rule); }
  .sheet { border-bottom: 1px solid var(--rule); }
  #clean-panel .source { order: 1; }
  #clean-panel .sheet { order: 2; }
  #clean-panel .steps { order: 3; }
  #clean-panel .dl-opts { order: 4; border-bottom: 0; }
  #compare-panel .sheet { order: 1; }
  #compare-panel .source { order: 2; }
  #compare-panel .samples { order: 3; border-bottom: 0; }
  .cmp-files { display: block; }
  html.cf-compare #compare-panel[hidden] { display: flex !important; }
  .drop-hint { display: none; }
  .facts-grid { grid-template-columns: 1fr; }
  .facts-grid > div, .facts-grid > div + div { padding: 16px 0; border-left: 0; border-top: 1px solid var(--rule); }
}
@media (max-width: 640px) {
  body { font-size: 16px; }
  .bar { padding: 8px 16px; gap: 12px; flex-wrap: wrap; }
  .bar-note { margin: 0; flex-basis: 100%; font-size: 13px; }
  .intro { padding: 18px 16px 14px; }
  h1 { font-size: 27px; }
  .lede { font-size: 16px; }
  .lede-more { display: none; }
  .bar { min-height: 0; }
  .bench { margin: 0; }
  .modes { padding: 0 8px; }
  .mode { flex: 1; padding: 8px 12px 10px; font-size: 15px; }
  .panel { border-left: 0; border-right: 0; }
  .block { padding: 14px 16px 16px; }
  .sheet-bar { padding: 10px 12px; }
  .bar-actions { margin-left: 0; width: 100%; flex-wrap: nowrap; }
  .bar-actions .btn.primary { flex: 1 1 auto; padding: 0 12px; }
  .dl-more, #clean-dl-note { display: none; }
  .legend { gap: 4px 12px; }
  .legend-row { padding: 8px 12px; }
  .legend-row .fine { margin: 0; }
  .grid-wrap { max-height: 72vh; }
  .grid td { max-width: 220px; }
  .facts, .faq, .guide-link { margin: 0 16px; padding-top: 40px; }
  .foot { padding: 20px 16px 28px; }
  .tw-xlinks { margin-left: 0; flex-basis: 100%; }
  .status span { padding: 0 10px; }
}
@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; transition: none !important; animation: none !important; }
}