:root { --ink: #1f2937; --mut: #6b7280; --acc: #047857; --acc-strong: #065f46; --line: #e5e7eb; --soft: #f6f7f9; }
* { box-sizing: border-box; margin: 0; }
* [hidden] { display: none !important; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; color: var(--ink); background: #fafafa; line-height: 1.6; }
.wrap { max-width: 1040px; margin: 0 auto; padding: 0 20px; }
.top { border-bottom: 1px solid var(--line); background: #fff; }
.top .wrap { display: flex; justify-content: space-between; align-items: center; padding: 14px 20px; }
.brand { display: inline-flex; align-items: center; text-decoration: none; }
.logo-mark { display: block; height: 28px; width: auto; flex: none; }
.tag { color: var(--mut); font-size: 13px; }
h1 { font-size: 30px; letter-spacing: -0.5px; margin: 34px 0 8px; }
h1 em { color: var(--acc); font-style: normal; }
.lede { color: var(--mut); font-size: 17px; margin-bottom: 22px; max-width: 680px; }
h2 { font-size: 19px; margin: 26px 0 10px; }
h3 { font-size: 15px; margin: 16px 0 6px; }
.card { background: #fff; border: 1px solid var(--line); border-radius: 14px; box-shadow: 0 1px 3px rgba(0,0,0,.05); }
.tool { padding: 20px 22px 22px; }
.field { display: flex; gap: 10px; flex-wrap: wrap; align-items: flex-end; }
.field label { flex: 1 1 320px; display: block; font-size: 13px; font-weight: 600; color: var(--mut); }
textarea#text-input { display: block; width: 100%; min-height: 64px; margin-top: 4px; padding: 10px 12px; font-size: 16px; font-family: inherit; color: var(--ink); background: #fff; border: 1px solid var(--line); border-radius: 8px; resize: vertical; }
textarea#text-input:focus { outline: 2px solid #a7f3d0; border-color: var(--acc); }
.btn.ghost { padding: 10px 14px; font-size: 14px; font-weight: 600; color: var(--ink); background: var(--soft); border: 1px solid var(--line); border-radius: 8px; cursor: pointer; }
.btn.ghost:hover { background: #eef0f3; }
.status { min-height: 22px; margin-top: 8px; font-size: 13px; color: var(--acc-strong); }
.hint { font-size: 12.5px; color: var(--mut); margin-top: 6px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 12px; margin-top: 18px; }
.style-card { padding: 12px 14px; background: #fff; border: 1px solid var(--line); border-radius: 12px; }
.style-card.featured { grid-column: 1 / -1; padding: 18px 20px; border-color: var(--acc); box-shadow: 0 2px 10px rgba(4,120,87,.10); }
.style-head { display: flex; justify-content: space-between; align-items: center; gap: 10px; }
.style-name { font-size: 12px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; color: var(--mut); }
.copy-btn { padding: 6px 12px; font-size: 13px; font-weight: 600; color: #fff; background: var(--acc); border: 0; border-radius: 8px; cursor: pointer; }
.copy-btn:hover { background: var(--acc-strong); }
.badge { display: inline-block; margin-left: 6px; padding: 1px 6px; font-size: 10px; font-weight: 600; letter-spacing: 0; text-transform: none; color: #6b7280; background: #f3f4f6; border: 1px solid var(--line); border-radius: 999px; vertical-align: 1px; }
.badge.any { color: var(--acc-strong); background: #ecfdf5; border-color: #a7f3d0; }
.style-out { margin-top: 8px; font-size: 20px; line-height: 1.5; word-break: break-word; font-family: '17maopao Fancy Math', '17maopao Fancy Enclosed', '17maopao Fancy Glyphs', "Noto Sans Math", "STIX Two Math", "Cambria Math", "Segoe UI Symbol", "Apple Symbols", system-ui, sans-serif; }
.style-card.featured .style-out { font-size: 26px; }
.style-note { margin-top: 8px; font-size: 12.5px; color: var(--mut); }
.info { margin: 34px 0; }
.info p, .info li { color: #374151; margin-bottom: 10px; }
.info ol, .info ul { padding-left: 20px; }
.steps { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; margin: 12px 0 6px; }
@media (max-width: 700px) { .steps { grid-template-columns: 1fr; } }
.steps div { padding: 14px; background: #fff; border: 1px solid var(--line); border-radius: 12px; font-size: 14px; }
.steps b { display: block; margin-bottom: 4px; }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(210px, 1fr)); gap: 12px; margin: 12px 0; }
.cards a { display: block; padding: 12px 14px; color: var(--ink); text-decoration: none; background: #fff; border: 1px solid var(--line); border-radius: 12px; font-size: 14.5px; font-weight: 600; }
.cards a:hover { border-color: var(--acc); }
.cards a small { display: block; margin-top: 3px; font-weight: 400; color: var(--mut); font-size: 12.5px; }
dl.faq { margin: 10px 0; }
dl.faq dt { font-weight: 700; margin-top: 14px; }
dl.faq dd { color: #374151; margin: 2px 0 0; }
.note-box { margin: 14px 0; padding: 12px 14px; font-size: 13.5px; color: #374151; background: #fffbeb; border: 1px solid #fde68a; border-radius: 10px; }
.foot { border-top: 1px solid var(--line); margin-top: 40px; padding: 18px 20px 30px; color: var(--mut); font-size: 13px; }
.foot a { display: inline-block; padding: 6px 2px; color: var(--acc); }
.crumb { margin-top: 20px; font-size: 13px; color: var(--mut); }
.crumb a { color: var(--acc); text-decoration: none; }
@media (max-width: 360px) { .wrap { padding: 0 12px; } .grid { grid-template-columns: 1fr; } }

/* 自带的样式字体：设备缺「数学字母」字形时会显示成方框，这里打一个只含用到的字形的子集补上 */
@font-face {
  font-family: '17maopao Fancy Math';
  src: url('/assets/fonts/fancy-math.ttf') format('truetype');
  font-display: swap;
  unicode-range: U+1D400-1D7FF, U+2100-214F;
}
@font-face {
  font-family: '17maopao Fancy Enclosed';
  src: url('/assets/fonts/fancy-enclosed.ttf') format('truetype');
  font-display: swap;
  unicode-range: U+2476-247C, U+249C-24EA, U+24FF, U+1F110-1F129, U+1F130-1F149, U+1F150-1F169, U+1F170-1F189;
}
@font-face {
  font-family: '17maopao Fancy Glyphs';
  src: url('/assets/fonts/fancy-glyphs.ttf') format('truetype');
  font-display: swap;
  unicode-range: U+00B2-00B3, U+00B9, U+017F, U+0183, U+0186, U+018E, U+0196, U+019A, U+01DD, U+01EB, U+0250, U+0252, U+0254, U+0258, U+025F, U+0262, U+0265, U+026A, U+026F, U+0274, U+0279, U+027E-0280, U+0287, U+028C-028F, U+0299, U+029C, U+029E-029F, U+02B0, U+02B2-02B3, U+02B7-02B8, U+02E1-02E3, U+02E5, U+0316, U+0336, U+038C, U+03DB, U+0500, U+1D00, U+1D04-1D05, U+1D07, U+1D09-1D0B, U+1D0D, U+1D0F, U+1D18, U+1D1A-1D1C, U+1D20-1D22, U+1D2C, U+1D2E, U+1D30-1D31, U+1D33-1D3A, U+1D3C, U+1D3E-1D43, U+1D47-1D49, U+1D4D, U+1D4F-1D50, U+1D52, U+1D56-1D58, U+1D5B, U+1D62-1D65, U+1D9C, U+1DA0, U+1DBB, U+2070-2071, U+2074-2079, U+207F-2089, U+2090-2093, U+2095-209C, U+2460-2468, U+278A-2792, U+2C7C-2C7D, U+A645, U+A730-A731, U+A781, U+A7FB;
}
.style-out { font-family: '17maopao Fancy Math', '17maopao Fancy Enclosed', '17maopao Fancy Glyphs', "Noto Sans Math", "STIX Two Math", "Cambria Math", "Segoe UI Symbol", "Apple Symbols", system-ui, sans-serif; }