/* ======================================================================
   IEEE754 浮点解析器 · 独立设计（石板青仪器面板主题）
   浅色 = 实验室仪表盘；深色 = 暗色示波器面板
   ====================================================================== */
.f7{
  --ink:#17293a; --sub:#54708a; --faint:#8aa3b8;
  --bg:#eef4f7; --card:#ffffff; --card2:#e9f2f6; --line:#cfe0e8; --line2:#ddebed;
  --pri:#0e7490; --pri-2:#0891b2; --pri-soft:#d9f0f6; --pri-ink:#155e75;
  --sign:#be185d; --sign-soft:#fbe3ef;
  --expo:#b45309; --expo-soft:#fdf0dd;
  --mant:#1d4ed8; --mant-soft:#e2eafb;
  --dial:#0f766e;
  --red:#b42323; --red-soft:#fdecec;
  --r:12px;
  --shadow:0 1px 2px rgba(23,41,58,.06),0 12px 28px rgba(14,116,144,.10);
  color:var(--ink);
  font-family:-apple-system,"PingFang SC","HarmonyOS Sans SC","Microsoft YaHei",system-ui,sans-serif;
  font-size:15px; line-height:1.75;
  background:
    radial-gradient(rgba(14,116,144,.10) 1px,transparent 1.4px),
    var(--bg);
  background-size:22px 22px,auto;
  padding:0 16px 56px;
}
:root[data-theme="dark"] .f7{
  --ink:#dbe9f0; --sub:#8fb2c6; --faint:#5d7f94;
  --bg:#081017; --card:#0f1a24; --card2:#14222e; --line:#24404f; --line2:#1b3341;
  --pri:#22d3ee; --pri-2:#67e8f9; --pri-soft:rgba(34,211,238,.12); --pri-ink:#a5f3fc;
  --sign:#f472b6; --sign-soft:rgba(244,114,182,.14);
  --expo:#fbbf24; --expo-soft:rgba(251,191,36,.12);
  --mant:#93c5fd; --mant-soft:rgba(147,197,253,.12);
  --dial:#5eead4;
  --red:#f87171; --red-soft:rgba(248,113,113,.12);
  --shadow:0 1px 2px rgba(0,0,0,.5),0 14px 32px rgba(0,0,0,.5);
  background:
    radial-gradient(rgba(34,211,238,.07) 1px,transparent 1.4px),
    var(--bg);
  background-size:22px 22px,auto;
}
.f7 *{box-sizing:border-box;}
.f7-wrap{max-width:1140px;margin:0 auto;}
.f7 input,.f7 select,.f7 .f7-mono{font-family:"JetBrains Mono",ui-monospace,Consolas,monospace;}

.f7-hero{margin-top:22px;background:linear-gradient(135deg,#083344,#155e75 55%,#0e7490);color:#cffafe;
  border-radius:var(--r);padding:24px 28px;box-shadow:var(--shadow);position:relative;overflow:hidden;}
:root[data-theme="dark"] .f7-hero{background:linear-gradient(135deg,#052430,#0b4a5c 55%,#0e5f74);}
.f7-hero::before{content:"0 10000011 10011001100110011001100";position:absolute;right:16px;top:10px;
  font-family:ui-monospace,Consolas,monospace;font-size:11px;letter-spacing:.16em;opacity:.3;}
.f7-hero h1{margin:0 0 8px;font-size:clamp(24px,3.6vw,32px);font-weight:900;}
.f7-hero p{margin:0;color:#9adbe8;font-size:14.5px;max-width:820px;}
.f7-hero p em{font-style:normal;color:#fde68a;font-weight:800;}

.f7-desk{display:grid;grid-template-columns:1.35fr 1fr;gap:18px;margin-top:20px;}
@media (max-width:980px){.f7-desk{grid-template-columns:1fr;}}
.f7-card{background:var(--card);border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--shadow);padding:18px;}
.f7-card h2{margin:0 0 12px;font-size:15.5px;font-weight:900;display:flex;align-items:center;gap:8px;letter-spacing:.03em;}
.f7-card h2::before{content:"◉";color:var(--pri);}
.f7-field{margin-bottom:12px;}
.f7-field label{display:block;font-size:12.5px;font-weight:800;color:var(--sub);margin-bottom:4px;letter-spacing:.05em;}
.f7-field input,.f7-field select{width:100%;padding:9px 12px;border-radius:8px;border:1.5px solid var(--line);
  background:var(--card2);color:var(--ink);font-size:14px;outline:none;}
.f7-field input:focus,.f7-field select:focus{border-color:var(--pri-2);box-shadow:0 0 0 3px var(--pri-soft);}
.f7-2col{display:grid;grid-template-columns:1fr 1fr;gap:10px;}
.f7-presets{display:flex;gap:6px;flex-wrap:wrap;margin-bottom:12px;}
.f7-pre{border:1.5px solid var(--line);background:var(--card2);color:var(--pri-ink);border-radius:8px;
  padding:5px 11px;font-size:12.5px;font-weight:800;cursor:pointer;font-family:ui-monospace,Consolas,monospace;}
.f7-pre:hover{border-color:var(--pri-2);}
.f7-row{display:flex;gap:8px;flex-wrap:wrap;margin-top:6px;}
.f7-btn{border:none;border-radius:9px;padding:9px 18px;font-size:14px;font-weight:800;cursor:pointer;transition:all .12s;}
.f7-btn-go{background:var(--pri);color:#fff;}
:root[data-theme="dark"] .f7-btn-go{color:#062026;}
.f7-btn-go:hover{background:var(--pri-2);}
.f7-btn-ghost{background:var(--card2);color:var(--pri-ink);border:1.5px solid var(--line);}
.f7-btn-ghost:hover{border-color:var(--pri-2);}
.f7-msg{margin-top:10px;font-size:13px;min-height:20px;font-weight:700;}
.f7-msg.err{color:var(--red);}
.f7-msg.ok{color:var(--pri);}

.f7-badge{display:inline-block;border-radius:7px;padding:2px 10px;font-size:12px;font-weight:900;margin-left:8px;
  background:var(--expo-soft);color:var(--expo);}
.f7-strip{margin-top:14px;overflow-x:auto;padding-bottom:4px;}
.f7-group{margin-bottom:10px;}
.f7-ghead{display:flex;align-items:baseline;gap:10px;margin-bottom:4px;}
.f7-ghead b{font-size:12.5px;font-weight:900;letter-spacing:.06em;}
.f7-ghead span{font-size:11px;color:var(--faint);font-family:ui-monospace,Consolas,monospace;}
.f7-group.sign .f7-ghead b{color:var(--sign);}
.f7-group.expo .f7-ghead b{color:var(--expo);}
.f7-group.mant .f7-ghead b{color:var(--mant);}
.f7-bits{display:flex;gap:2px;}
.f7-bits .f7-sep{width:7px;}
.f7-bit{width:14px;height:22px;flex:none;border-radius:3px;display:flex;align-items:center;justify-content:center;
  font-family:ui-monospace,Consolas,monospace;font-size:10.5px;font-weight:800;background:var(--card2);color:var(--faint);
  border:1px solid var(--line2);}
.f7-group.sign .f7-bit.one{background:var(--sign);color:#fff;border-color:var(--sign);}
.f7-group.expo .f7-bit.one{background:var(--expo);color:#fff;border-color:var(--expo);}
.f7-group.mant .f7-bit.one{background:var(--mant);color:#fff;border-color:var(--mant);}
:root[data-theme="dark"] .f7-bit.one{color:#0a1218;}

.f7-tbl{width:100%;border-collapse:collapse;font-size:13px;margin-top:12px;}
.f7-tbl th,.f7-tbl td{border:1px solid var(--line);padding:6px 10px;text-align:left;word-break:break-all;}
.f7-tbl th{background:var(--card2);font-weight:800;white-space:nowrap;color:var(--sub);}
.f7-tbl td{font-family:ui-monospace,Consolas,monospace;}
.f7-tbl td b{color:var(--pri-ink);}
.f7-err{margin-top:12px;background:var(--expo-soft);border:1px solid var(--expo);border-radius:10px;padding:10px 14px;font-size:13px;}
.f7-err b{color:var(--expo);}
.f7-err .f7-mono{word-break:break-all;}

.f7-note{margin-top:18px;}
.f7-note h3{margin:0 0 8px;font-size:16px;font-weight:900;color:var(--pri-ink);}
.f7-note p{margin:0 0 8px;color:var(--sub);font-size:14px;}
.f7-note p b{color:var(--ink);}

.f7-faq{margin-top:34px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);padding:22px 24px;box-shadow:var(--shadow);}
.f7-faq h2{margin:0 0 12px;font-size:19px;font-weight:900;}
.f7-faq h3{margin:18px 0 6px;font-size:15.5px;font-weight:800;color:var(--pri-ink);}
.f7-faq p{margin:0;color:var(--sub);font-size:14px;}
.f7-faq p b{color:var(--ink);}

/* ===== 新增：单双精度对比 / 误差扫描 / 位域布局（前缀 f7x） ===== */
.f7x-lab{margin-top:20px;background:var(--card);border:1px solid var(--line);border-radius:var(--r);
  box-shadow:var(--shadow);padding:18px;}
.f7x-lab h2{margin:0 0 12px;font-size:15.5px;font-weight:900;display:flex;align-items:center;gap:8px;letter-spacing:.03em;}
.f7x-lab h2::before{content:"◉";color:var(--pri);}
.f7x-head{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-bottom:10px;}
.f7x-head h2{margin:0;}
.f7x-actions{display:flex;gap:8px;flex-wrap:wrap;}
.f7x-lab > p{margin:0 0 10px;color:var(--sub);font-size:13.5px;}
.f7x-lab > p b{color:var(--pri-ink);}
.f7x-tblwrap{overflow-x:auto;}
.f7x-tbl{width:100%;min-width:640px;border-collapse:collapse;font-size:12.5px;}
.f7x-tbl th{text-align:left;color:var(--faint);font-size:11.5px;font-weight:800;letter-spacing:.04em;
  padding:6px 10px;border-bottom:1px solid var(--line);white-space:nowrap;}
.f7x-tbl td{padding:7px 10px;border-bottom:1px solid var(--line2);vertical-align:top;word-break:break-all;}
.f7x-tbl td.f7x-mono{font-family:"JetBrains Mono",ui-monospace,Consolas,monospace;color:var(--pri-ink);}
.f7x-empty{padding:16px;text-align:center;color:var(--faint);font-size:13px;
  border:1px dashed var(--line);border-radius:var(--r);background:var(--card2);}
.f7x-svgwrap{margin-top:10px;overflow-x:auto;border:1px solid var(--line2);
  border-radius:var(--r);background:var(--card2);padding:8px;}
.f7x-svgwrap svg{display:block;width:100%;min-width:640px;height:auto;}
.f7x-facts{display:flex;gap:8px;flex-wrap:wrap;margin-top:12px;}
.f7x-facts span{background:var(--card2);border:1px solid var(--line2);border-radius:999px;
  padding:4px 12px;font-size:12px;color:var(--sub);}
.f7x-facts b{color:var(--pri-ink);font-family:ui-monospace,Consolas,monospace;}
@media (max-width:640px){
  .f7x-lab{padding:14px;}
  .f7x-head{flex-direction:column;align-items:flex-start;}
}