/* 999-se.cn -- paper-neutral shell so sample colours read true.
   System fonts only, no external resources, no sticky/fixed layers. */

:root {
  --bg: #F7F6F3;
  --card: #FFFFFF;
  --ink: #1A1A1C;
  --sub: #5C5C63;
  --line: #E2DFD8;
  --line2: #CFCAC0;
  --brand: #1F3A5F;
  --brand-soft: #E7ECF3;
  --accent: #C8553D;
  --ok: #2F7465;
  --bad: #B4342A;
  --warnbg: #FBF6E9;
  --sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, "Courier New", monospace;
}

*, *::before, *::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font: 400 16px/1.75 var(--sans);
  overflow-wrap: break-word;
}

h1, h2, h3, h4 { line-height: 1.4; margin: 0; font-weight: 700; letter-spacing: -0.01em; }
p { margin: 0 0 0.9em; }
a { color: var(--brand); text-decoration: underline; text-underline-offset: 2px; text-decoration-thickness: 1px; }
a:hover { color: var(--accent); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
code, pre, .mono { font-family: var(--mono); font-size: 0.92em; }
.nb { white-space: nowrap; }

.skip {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip-path: inset(50%); white-space: nowrap;
}
.skip:focus {
  position: static; width: auto; height: auto; clip-path: none;
  display: block; padding: 8px 16px; background: var(--brand); color: #fff;
}

.wrap { max-width: 1080px; margin: 0 auto; padding: 0 16px; }

/* --- masthead / nav ------------------------------------------------------ */
.top { background: var(--card); border-bottom: 1px solid var(--line); }
.topbar { display: flex; flex-wrap: wrap; gap: 10px 20px; align-items: baseline; padding-top: 14px; padding-bottom: 12px; }
.brand { display: flex; align-items: baseline; gap: 8px; text-decoration: none; color: var(--ink); min-width: 0; }
.brand-mark {
  width: 14px; height: 14px; flex: none; border-radius: 2px;
  background: linear-gradient(135deg, var(--brand) 0 50%, var(--accent) 50% 100%);
}
.brand-name { font-size: 20px; font-weight: 700; letter-spacing: 0.02em; }
.brand-sub { font-size: 12px; color: var(--sub); }
.sitenav { display: flex; flex-wrap: wrap; gap: 4px 2px; margin-left: auto; }
.sitenav a {
  display: block; padding: 6px 11px; border: 1px solid transparent; border-radius: 2px;
  font-size: 15px; text-decoration: none; color: var(--ink); white-space: nowrap;
}
.sitenav a:hover { background: var(--brand-soft); }
.sitenav a[aria-current="page"] { border-color: var(--line2); background: var(--brand-soft); color: var(--brand); font-weight: 700; }

/* --- page head ----------------------------------------------------------- */
main { display: block; padding-bottom: 48px; }
.crumbs { font-size: 13px; color: var(--sub); padding: 14px 0 0; display: flex; flex-wrap: wrap; gap: 0 6px; }
.crumbs a { color: var(--sub); }
.crumbs .here { color: var(--ink); }

.masthead { padding: 18px 0 8px; border-bottom: 1px solid var(--line); margin-bottom: 26px; }
.masthead h1 { font-size: clamp(23px, 5.4vw, 34px); }
.masthead .lead { margin: 12px 0 0; font-size: 17px; color: var(--sub); max-width: 62ch; }
.rail { margin-top: 18px; }
.railsvg { display: block; width: 100%; height: 16px; border-radius: 2px; }

/* --- sections ------------------------------------------------------------ */
.sec { margin: 0 0 34px; }
.sec > h2 {
  font-size: clamp(19px, 4.2vw, 23px); padding-bottom: 7px; margin-bottom: 14px;
  border-bottom: 2px solid var(--brand);
}
.sec h3 { font-size: 17px; margin: 22px 0 8px; }
.sec h3:first-child { margin-top: 0; }

.bl, .nl { margin: 0 0 1em; padding-left: 1.3em; }
.bl li, .nl li { margin-bottom: 0.4em; }

.dfl { margin: 0 0 1em; border-top: 1px solid var(--line); }
.dfl-row { display: grid; grid-template-columns: minmax(0, 8.5em) minmax(0, 1fr); gap: 4px 14px; padding: 9px 0; border-bottom: 1px solid var(--line); }
.dfl dt { font-weight: 700; min-width: 0; }
.dfl dd { margin: 0; min-width: 0; color: var(--sub); }

.note, .note-warn {
  background: var(--card); border: 1px solid var(--line); border-left: 3px solid var(--brand);
  border-radius: 2px; padding: 14px 16px 4px; margin: 0 0 20px; font-size: 15px;
}
.note-warn { border-left-color: var(--accent); background: var(--warnbg); }
.note-hd { font-weight: 700; margin-bottom: 0.5em; }
.note p:last-child, .note-warn p:last-child { margin-bottom: 0.9em; }

.codelab { font-size: 13px; color: var(--sub); margin-bottom: 4px; }
.codewrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 2px; background: #FBFAF7; margin: 0 0 18px; }
pre.code { margin: 0; padding: 12px 14px; font-size: 13px; line-height: 1.7; }

/* --- figures ------------------------------------------------------------- */
.fig { margin: 0 0 22px; }
.dia { display: block; width: 100%; max-width: 480px; height: auto; background: var(--card); border: 1px solid var(--line); border-radius: 2px; }
.dia text { font-family: var(--sans); font-size: 12px; fill: var(--ink); }
.dia .dl-c { text-anchor: middle; }
.dia .dl-s { text-anchor: start; fill: var(--sub); }
.dia .dl-e { text-anchor: end; fill: var(--sub); }
.dia .dl-b { font-size: 13px; font-weight: 700; }
.dia .dl-c-ink { text-anchor: middle; fill: #FFFFFF; font-weight: 700; }
.fig figcaption { font-size: 13.5px; color: var(--sub); margin-top: 8px; max-width: 54ch; }

/* --- swatches ------------------------------------------------------------ */
.swgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(148px, 1fr)); gap: 12px; margin-bottom: 20px; }
.sw { min-width: 0; background: var(--card); border: 1px solid var(--line); border-radius: 2px; overflow: hidden; }
.sw-chip { height: 76px; display: flex; align-items: flex-end; padding: 6px 8px; }
.sw-chip-hex { font-family: var(--mono); font-size: 12px; letter-spacing: 0.04em; }
.sw-meta { padding: 9px 10px 10px; }
.sw-name { font-weight: 700; font-size: 15px; margin: 0 0 2px; }
.sw-note { font-size: 13px; color: var(--sub); margin: 0 0 6px; }
.sw-nums { display: flex; flex-wrap: wrap; gap: 2px 10px; font-family: var(--mono); font-size: 11.5px; color: var(--sub); margin: 0; }
.sw-act { margin: 6px 0 0; font-size: 12.5px; }

.chiprow { display: flex; gap: 3px; margin-top: 10px; }
.chip { display: block; width: 22px; height: 14px; border-radius: 1px; border: 1px solid rgba(0, 0, 0, 0.08); }

/* --- tables: real table wide, stacked cards narrow ----------------------- */
.tblwrap { margin: 0 0 22px; }
.dt { width: 100%; border-collapse: collapse; font-size: 15px; }
.dt caption { text-align: left; font-size: 13px; color: var(--sub); padding-bottom: 7px; }
.dt th, .dt td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--line); vertical-align: top; }
.dt thead th { background: var(--brand-soft); border-bottom: 1px solid var(--line2); font-size: 14px; }
.dt td .mono, .dt td code { white-space: nowrap; }
@media (max-width: 640px) {
  .dt, .dt tbody, .dt tr, .dt td { display: block; width: 100%; }
  /* The table becomes display:block here, which leaves a table-caption child
     shrink-wrapped to min-content -- CJK then renders one character per line. */
  .dt caption { display: block; width: 100%; }
  .dt thead { display: none; }
  .dt tr { background: var(--card); border: 1px solid var(--line); border-radius: 2px; margin-bottom: 10px; }
  .dt td { border-bottom: 1px solid var(--line); padding: 7px 11px; display: flex; gap: 10px; justify-content: space-between; }
  .dt tr td:last-child { border-bottom: 0; }
  .dt td::before { content: attr(data-l); color: var(--sub); font-size: 13px; flex: none; }
}

/* --- cards --------------------------------------------------------------- */
.cardgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(232px, 1fr)); gap: 14px; margin-bottom: 20px; }
.card { min-width: 0; background: var(--card); border: 1px solid var(--line); border-radius: 2px; padding: 15px 16px; }
.card h3 { font-size: 16.5px; margin: 0 0 7px; }
.card h3 a { text-decoration: none; }
.card h3 a:hover { text-decoration: underline; }
.card p { font-size: 14.5px; color: var(--sub); margin: 0; }

.rel { border-top: 1px solid var(--line); padding-top: 16px; margin-top: 8px; }
.rel-hd { font-weight: 700; margin-bottom: 8px; }
.rel ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 9px; }
.rel li { display: grid; gap: 2px; }
.rel li span { font-size: 13.5px; color: var(--sub); }

/* --- hero (home) --------------------------------------------------------- */
.hero-acts { display: flex; flex-wrap: wrap; gap: 10px; margin: 18px 0 0; }
.btn {
  display: inline-block; padding: 9px 16px; border-radius: 2px; font-size: 15px; font-weight: 700;
  text-decoration: none; border: 1px solid var(--brand); color: var(--brand); background: var(--card);
}
.btn:hover { background: var(--brand-soft); color: var(--brand); }
.btn-pri { background: var(--brand); border-color: var(--brand); color: #fff; }
.btn-pri:hover { background: #17304f; color: #fff; }

/* --- tool layout --------------------------------------------------------- */
.tool { display: grid; gap: 20px; margin-bottom: 30px; }
@media (min-width: 900px) { .tool { grid-template-columns: minmax(0, 310px) minmax(0, 1fr); align-items: start; } }
.panel { min-width: 0; background: var(--card); border: 1px solid var(--line); border-radius: 2px; padding: 16px; }
.panel h3 { font-size: 15.5px; margin: 0 0 12px; }
.fld { display: grid; gap: 5px; margin-bottom: 14px; min-width: 0; }
.fld > label { font-size: 13.5px; color: var(--sub); font-weight: 700; }
.fld input[type="text"], .fld select, .fld textarea {
  width: 100%; min-width: 0; font: inherit; font-family: var(--mono); font-size: 14px;
  padding: 8px 10px; border: 1px solid var(--line2); border-radius: 2px; background: #FDFCFA; color: var(--ink);
}
.fld input[type="range"] { width: 100%; min-width: 0; accent-color: var(--brand); }
.fld .hint { font-size: 12.5px; color: var(--sub); }
.row2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(0, 1fr)); gap: 0 12px; }
button.act {
  font: inherit; font-weight: 700; font-size: 14.5px; cursor: pointer;
  padding: 8px 14px; border-radius: 2px; border: 1px solid var(--brand);
  background: var(--brand); color: #fff;
}
button.act.ghost { background: var(--card); color: var(--brand); }
button.act:hover { background: #17304f; color: #fff; }
button.act.ghost:hover { background: var(--brand-soft); color: var(--brand); }
.actrow { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.swatchpv { height: 54px; border: 1px solid var(--line2); border-radius: 2px; }
textarea.out { min-height: 132px; resize: vertical; line-height: 1.6; }

.verdicts { display: grid; grid-template-columns: repeat(auto-fit, minmax(0, 1fr)); gap: 10px; margin: 0 0 16px; }
.vd { min-width: 0; border: 1px solid var(--line); border-radius: 2px; padding: 10px 12px; background: var(--card); }
.vd b { display: block; font-size: 13px; color: var(--sub); font-weight: 700; }
.vd .mark { font-size: 17px; font-weight: 700; }
.vd.pass { border-left: 3px solid var(--ok); }
.vd.pass .mark { color: var(--ok); }
.vd.fail { border-left: 3px solid var(--bad); }
.vd.fail .mark { color: var(--bad); }
.bignum { font-family: var(--mono); font-size: clamp(30px, 8vw, 44px); font-weight: 700; line-height: 1.2; }
.samples { border: 1px solid var(--line); border-radius: 2px; padding: 14px 16px; margin-bottom: 18px; }
.samples p { margin: 0 0 8px; }
.samples .s-big { font-size: 24px; font-weight: 700; }
.samples p:last-child { margin: 0; }

.fail-msg { display: none; border: 1px solid var(--bad); border-left: 3px solid var(--bad); background: #FCEFEE; color: #7D1F18; border-radius: 2px; padding: 10px 13px; font-size: 14.5px; margin-bottom: 14px; }
.fail-msg.on { display: block; }
.ok-msg { color: var(--ok); font-size: 13.5px; min-height: 1.4em; margin: 0; }

.simgrid { display: grid; grid-template-columns: repeat(auto-fill, minmax(118px, 1fr)); gap: 10px; margin-bottom: 16px; }
.simcell { min-width: 0; border: 1px solid var(--line); border-radius: 2px; overflow: hidden; background: var(--card); }
.simcell .half { height: 42px; }
.simcell .cap { font-family: var(--mono); font-size: 11.5px; padding: 5px 7px; color: var(--sub); }

.gradbar { height: 56px; border: 1px solid var(--line2); border-radius: 2px; margin-bottom: 6px; }
.gradlab { font-size: 13px; color: var(--sub); margin-bottom: 14px; }

.saved { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.saved li { background: var(--card); border: 1px solid var(--line); border-radius: 2px; padding: 11px 13px; }
.saved .nm { font-weight: 700; margin: 0 0 6px; word-break: break-word; }
.saved .cl { display: flex; flex-wrap: wrap; gap: 3px; margin-bottom: 8px; }
.saved .cl span { width: 26px; height: 18px; border: 1px solid rgba(0, 0, 0, 0.08); border-radius: 1px; }
.saved .ops { display: flex; flex-wrap: wrap; gap: 7px; }
.saved .ops button { font: inherit; font-size: 13px; cursor: pointer; padding: 4px 10px; border: 1px solid var(--line2); border-radius: 2px; background: #FBFAF7; color: var(--ink); }
.saved .ops button:hover { border-color: var(--brand); color: var(--brand); }
.empty { color: var(--sub); font-size: 14.5px; }

.nearlist { display: grid; gap: 8px; margin: 0 0 16px; padding: 0; list-style: none; }
.nearlist li { display: flex; align-items: center; gap: 10px; background: var(--card); border: 1px solid var(--line); border-radius: 2px; padding: 8px 11px; min-width: 0; }
.nearlist .pv { width: 40px; height: 28px; flex: none; border: 1px solid rgba(0, 0, 0, 0.1); border-radius: 1px; }
.nearlist .tx { min-width: 0; font-size: 14.5px; }
.nearlist .tx b { display: block; }
.nearlist .tx span { font-family: var(--mono); font-size: 12px; color: var(--sub); }

/* --- footer -------------------------------------------------------------- */
.foot { background: var(--card); border-top: 1px solid var(--line); padding: 30px 0 34px; font-size: 14.5px; color: var(--sub); }
.footgrid { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px, 1fr)); gap: 22px; }
.footcol { min-width: 0; }
.footbrand { font-size: 17px; font-weight: 700; color: var(--ink); margin-bottom: 6px; }
.foothd { font-weight: 700; color: var(--ink); margin-bottom: 7px; }
.footcol ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 6px; }
.footnote { border-top: 1px solid var(--line); margin-top: 24px; padding-top: 16px; font-size: 13px; }
.footnote p { margin: 0; max-width: 78ch; }