/* CalcHub theme layer — design tokens + component styling.
   To make a DIFFERENT site: rewrite this file. Markup (.cc-*) and engine stay the same. */
:root{
  --accent:#2f6bd8; --accent-ink:#1e4fae; --accent-2:#5b8def; --head1:#3f7ad8; --head2:#2b57a8;
  --bg:#eef1f6; --card:#fff; --key:#f4f7fb; --line:#dbe3ef; --ink:#12203a; --muted:#6b7791;
  --op:#e8f0ff; --op-ink:#1e4fae; --good:#0ca678; --good-bg:#e7f8f2; --warn:#c0392b;
  --mono:ui-monospace,"SF Mono",SFMono-Regular,Menlo,Consolas,monospace;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,Helvetica,Arial,sans-serif; --r:14px;
}
*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{margin:0}
body{background:var(--bg);color:var(--ink);font-family:var(--sans);line-height:1.55;-webkit-font-smoothing:antialiased}
a{color:var(--accent-ink)}
img{max-width:100%}

/* site chrome */
.site-top{background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:30}
.site-top-in{max-width:1080px;margin:0 auto;padding:12px 18px;display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:9px;font-weight:800;letter-spacing:-.02em;font-size:19px;text-decoration:none;color:var(--ink)}
.brand .mk{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,var(--accent),var(--accent-2));display:grid;place-items:center;color:#fff;font-family:var(--mono);font-weight:700}
.site-nav{margin-left:auto;display:flex;gap:6px;flex-wrap:wrap}
.site-nav a{color:var(--muted);text-decoration:none;font-size:14px;font-weight:600;padding:6px 10px;border-radius:8px}
.site-nav a:hover{background:var(--key)}
.wrap{max-width:1080px;margin:0 auto;padding:22px 18px 70px}
.two{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:20px}
@media(max-width:840px){ .two{grid-template-columns:1fr} }

.site-foot{border-top:1px solid var(--line);margin-top:40px}
.site-foot-in{max-width:1080px;margin:0 auto;padding:26px 18px 50px;color:var(--muted);font-size:13px}
.site-foot-in nav a{color:var(--muted);margin-right:14px;text-decoration:none}

/* page headings */
.page-h1{font-size:clamp(1.6rem,4vw,2.3rem);letter-spacing:-.03em;margin:0 0 8px}
.lede{color:var(--muted);max-width:60ch;margin:0 0 22px}

/* ---------------- calculator app (scientific) ---------------- */
.cc-app{background:var(--card);border:1px solid var(--line);border-radius:20px;overflow:hidden;box-shadow:0 20px 50px -30px rgba(20,40,80,.5)}
.cc-screen{background:linear-gradient(160deg,var(--head1),var(--head2));color:#fff;padding:16px 18px 14px;position:sticky;top:56px;z-index:5}
.cc-bar{display:flex;align-items:center;gap:10px;font-size:12px;margin-bottom:12px}
.cc-title{font-weight:700}
.cc-seg{margin-left:auto;display:flex;background:rgba(255,255,255,.15);border-radius:999px;padding:2px}
.cc-seg button{border:0;background:none;color:#fff;font:inherit;font-size:12px;font-weight:600;padding:4px 12px;border-radius:999px;cursor:pointer;opacity:.75}
.cc-seg button[aria-pressed="true"]{background:#fff;color:var(--accent-ink);opacity:1}
.cc-mem{font-family:var(--mono);font-size:11px;background:rgba(255,255,255,.16);padding:3px 8px;border-radius:6px}
.cc-mem.off{display:none}
.cc-expr{font-family:var(--mono);font-size:15px;min-height:22px;text-align:right;opacity:.9;word-break:break-all;overflow-x:auto}
.cc-result{font-family:var(--mono);font-variant-numeric:tabular-nums;font-size:clamp(1.9rem,8vw,3rem);font-weight:700;text-align:right;line-height:1.1;word-break:break-all;min-height:1.1em}
.cc-result.cc-preview{opacity:.55;font-weight:500}
.cc-pad{display:grid;grid-template-columns:1fr 1fr;gap:14px;padding:14px}
@media(max-width:760px){ .cc-pad{grid-template-columns:1fr;gap:12px} }
.cc-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:7px}
.cc-k{border:1px solid var(--line);background:var(--key);color:var(--ink);border-radius:12px;font:inherit;font-size:15px;font-weight:600;min-height:48px;cursor:pointer;display:flex;align-items:center;justify-content:center;user-select:none;transition:transform .05s}
.cc-k sup{font-size:.7em}
.cc-k:active{transform:translateY(1px);background:#e9eef6}
.cc-num{background:#fff;font-size:18px}
.cc-op{background:var(--op);color:var(--op-ink)}
.cc-fn{font-size:14px}
.cc-eq{background:linear-gradient(180deg,var(--accent-2),var(--accent));color:#fff;border:0}
.cc-warn{color:var(--warn)}
.cc-mode{font-size:13px}
.cc-mode[aria-pressed="true"]{background:var(--accent);color:#fff;border-color:var(--accent)}

/* actions bar (both types) */
.cc-acts{display:flex;gap:8px;padding:10px 14px;background:#f7f9fc;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.cc-acts.hidden{display:none}
.cc-acts button{flex:1;border:1px solid var(--line);background:#fff;color:var(--accent-ink);font:inherit;font-weight:600;font-size:13px;padding:9px;border-radius:10px;cursor:pointer}
.cc-acts button:active{transform:translateY(1px)}

/* ---------------- form calculators ---------------- */
.cc-formapp{background:var(--card);border:1px solid var(--line);border-radius:20px;overflow:hidden}
.cc-form{display:grid;grid-template-columns:1fr 1fr;gap:14px 16px;padding:20px}
@media(max-width:560px){ .cc-form{grid-template-columns:1fr} }
.cc-field{display:flex;flex-direction:column;gap:6px}
.cc-field.cc-full{grid-column:1/-1}
.cc-field label{font-size:13px;font-weight:600;color:#3b4351}
.cc-ctrl{position:relative;display:flex;align-items:center}
.cc-pre,.cc-suf{position:absolute;color:var(--muted);font-size:14px;pointer-events:none}
.cc-pre{left:12px}.cc-suf{right:12px}
.cc-form input,.cc-form select,.cc-form textarea{width:100%;border:1px solid var(--line);border-radius:10px;padding:11px 12px;font:inherit;font-size:15px;background:#f6f8fb;color:var(--ink)}
.cc-has-pre{padding-left:26px}.cc-has-suf{padding-right:44px}
.cc-form input:focus,.cc-form select:focus,.cc-form textarea:focus{outline:2px solid var(--accent);outline-offset:1px;background:#fff}
.cc-check{flex-direction:row;align-items:center;gap:9px}
.cc-check input{width:17px;height:17px}
.cc-rows{grid-column:1/-1;display:flex;flex-direction:column;gap:8px}
.cc-rows-body{display:flex;flex-direction:column;gap:8px}
.cc-row{display:grid;grid-template-columns:1fr 120px 40px;gap:8px}
.cc-x{border:1px solid var(--line);background:#f6f8fb;border-radius:9px;cursor:pointer;color:var(--muted);font-size:18px}
.cc-add{align-self:start;border:1px dashed var(--line);background:none;color:var(--accent-ink);font-weight:600;border-radius:9px;padding:8px 14px;cursor:pointer;font-size:13px}
.cc-out{margin:0 20px}
.cc-primary{background:var(--good-bg);border:1px solid #cdeede;border-radius:12px;padding:16px 18px;margin-top:4px}
.cc-pk{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:#0a7a5c;font-weight:700}
.cc-pv{font-family:var(--mono);font-variant-numeric:tabular-nums;font-size:clamp(1.6rem,5vw,2.2rem);font-weight:700;color:#075e46;word-break:break-word}
.cc-rowline{display:flex;justify-content:space-between;gap:16px;padding:10px 2px;border-bottom:1px solid var(--line)}
.cc-rowline .cc-rv{font-family:var(--mono);font-variant-numeric:tabular-nums;font-weight:600}
.cc-note{padding:0 20px}
.cc-disclaimer{background:#fff8e6;border:1px solid #f2e2b0;color:#6b5a1c;border-radius:10px;padding:10px 14px;font-size:13px;margin:14px 0}

/* ---------------- history + report ---------------- */
.cc-hist{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:14px;align-self:start}
.cc-hist-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.cc-hist-head h2{font-size:14px;margin:0}
.cc-hist-clear{border:0;background:none;color:var(--muted);font:inherit;font-size:12px;cursor:pointer;text-decoration:underline}
.cc-hist-list{display:flex;flex-direction:column;gap:6px;max-height:60vh;overflow:auto}
.cc-hitem{border:1px solid var(--line);border-radius:10px;padding:9px 11px;cursor:pointer;background:#fbfcfe}
.cc-hitem:hover{border-color:var(--accent-2)}
.cc-he{font-family:var(--mono);font-size:12px;color:var(--muted);word-break:break-all}
.cc-hr{font-family:var(--mono);font-variant-numeric:tabular-nums;font-weight:700;font-size:15px;word-break:break-all}
.cc-ht{font-size:10px;color:#9aa4b5;margin-top:2px}
.cc-hist-empty{color:var(--muted);font-size:13px;text-align:center;padding:14px}
.cc-hist-note{font-size:11px;color:#9aa4b5;margin-top:8px}
.cc-report-wrap{margin-top:14px}
.cc-report{border:1px solid var(--line);background:#fff;color:var(--muted);border-radius:9px;padding:8px 12px;font:inherit;font-size:12px;cursor:pointer}
.cc-report-form{margin-top:10px;display:flex;flex-direction:column;gap:8px}
.cc-report-form.hidden{display:none}
.cc-report-form textarea{border:1px solid var(--line);border-radius:10px;padding:10px;font:inherit;min-height:70px}
.cc-report-row{display:flex;gap:10px;align-items:center}
.cc-report-row button{border:0;background:var(--accent);color:#fff;border-radius:9px;padding:8px 14px;font:inherit;font-weight:600;cursor:pointer}
.cc-report-msg{font-size:12px;color:var(--muted)}
.hidden{display:none!important}

/* ---------------- auto banner (no images) + directory ---------------- */
.banner{border-radius:16px;padding:26px 22px;color:#fff;position:relative;overflow:hidden}
.banner h1,.banner h2{margin:0}
.dir{display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:14px;margin-top:18px}
.dir-cat{grid-column:1/-1;font-size:12px;text-transform:uppercase;letter-spacing:.08em;color:var(--muted);margin:14px 2px 0}
.card-calc{display:block;text-decoration:none;color:inherit;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:var(--card);transition:transform .1s,box-shadow .1s}
.card-calc:hover{transform:translateY(-2px);box-shadow:0 16px 30px -20px rgba(20,40,80,.4)}
.card-calc .thumb{height:84px;display:flex;align-items:center;justify-content:center;color:#fff;font-weight:800;font-size:22px;font-family:var(--mono)}
.card-calc .cc-body{padding:12px 14px}
.card-calc .cc-name{font-weight:700;letter-spacing:-.01em}
.card-calc .cc-blurb{color:var(--muted);font-size:13px;margin-top:3px}

/* prose / seo content + faq */
.prose{margin-top:28px}
.prose h2{font-size:1.25rem;letter-spacing:-.02em;margin:24px 0 10px}
.prose p{color:#39414e}
.formula{font-family:var(--mono);background:#f6f8fb;border:1px solid var(--line);border-radius:10px;padding:12px 14px;font-size:14px}
details.faq{border:1px solid var(--line);border-radius:10px;padding:2px 14px;margin-bottom:8px;background:var(--card)}
details.faq summary{cursor:pointer;padding:12px 0;font-weight:600;list-style:none}
details.faq summary::-webkit-details-marker{display:none}
details.faq[open] summary{color:var(--accent-ink)}
details.faq .a{color:#39414e;padding:0 0 12px;font-size:14.5px}
.tags a{display:inline-block;font-size:12px;color:var(--muted);border:1px solid var(--line);border-radius:999px;padding:4px 10px;margin:0 6px 6px 0;text-decoration:none}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
@media(prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}