/* CapstoneCalc — exam-paper light theme, emerald CTA, proven motion system. */
*{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#F7F8FA; --surface:#FFFFFF; --inset:#EEF1F5; --border:#DFE4EB;
  --text:#1D2433; --text-2:#4C566A; --text-3:#8792A3;
  --acc:#10B981; --acc-deep:#047857; --acc-on:#03291E; --acc-text:#067A58;
  --acc2:#4F46E5; --acc2-text:#4338CA;
  --good:#059669; --warn:#B45309; --bad:#DC2626;
  --font-display:'Fraunces','Iowan Old Style',Georgia,serif;
  --font-ui:'Nunito Sans',-apple-system,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  --sh-rest:0 1px 1px hsl(220 25% 20% / .05),0 2px 2px hsl(220 25% 20% / .05),0 4px 4px hsl(220 25% 20% / .05),0 8px 8px hsl(220 25% 20% / .05);
  --sh-lift:0 2px 2px hsl(220 25% 20% / .06),0 4px 4px hsl(220 25% 20% / .06),0 8px 8px hsl(220 25% 20% / .06),0 16px 16px hsl(220 25% 20% / .07);
  --sh-press:0 1px 1px hsl(220 25% 20% / .1),0 1px 2px hsl(220 25% 20% / .1);
  --sh-cta:0 1px 1px hsl(220 25% 20% / .07),0 2px 4px hsl(220 25% 20% / .07),0 6px 14px hsl(160 84% 39% / .35);
  --sh-cta-hover:0 2px 2px hsl(220 25% 20% / .07),0 4px 8px hsl(220 25% 20% / .07),0 10px 26px hsl(160 84% 39% / .45);
  --ease-pop:cubic-bezier(.34,1.56,.64,1); --ease-out:cubic-bezier(.22,1,.36,1); --ease-press:cubic-bezier(.4,0,.6,1);
  --t-press:90ms; --t-hover:180ms;
}
@media(prefers-color-scheme:dark){:root{
  --bg:#12151C; --surface:#1B2029; --inset:#0D1015; --border:#2B323F;
  --text:#E8EBF1; --text-2:#AAB2C0; --text-3:#78829A;
  --acc:#34D399; --acc-deep:#059669; --acc-on:#03291E; --acc-text:#5EEAB4;
  --acc2:#818CF8; --acc2-text:#A5B0FB;
  --good:#34D399; --warn:#FBBF24; --bad:#F87171;
  --sh-rest:0 1px 2px hsl(220 30% 3% / .5),0 4px 8px hsl(220 30% 3% / .4),inset 0 1px 0 hsl(220 20% 90% / .05);
  --sh-lift:0 4px 8px hsl(220 30% 3% / .5),0 14px 30px hsl(220 30% 3% / .45),inset 0 1px 0 hsl(220 20% 90% / .07);
  --sh-press:0 1px 2px hsl(220 30% 3% / .6);
  --sh-cta:0 2px 4px hsl(220 30% 3% / .45),0 6px 16px hsl(160 70% 45% / .3);
  --sh-cta-hover:0 4px 8px hsl(220 30% 3% / .45),0 10px 28px hsl(160 70% 45% / .42);
}}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:var(--font-ui);font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;overflow-x:hidden}
header{display:flex;align-items:center;gap:.9rem;flex-wrap:wrap;padding:.9rem 1.25rem;border-bottom:1px solid var(--border);background:var(--surface)}
.logo{display:flex;align-items:center;gap:.55rem;text-decoration:none;color:var(--text)}
.logo-cap{filter:drop-shadow(0 2px 4px hsl(160 60% 30% / .3));transition:transform var(--t-hover) var(--ease-pop)}
.logo:hover .logo-cap{transform:rotate(-10deg) scale(1.08)}
.wordmark{font-family:var(--font-display);font-weight:700;font-size:1.28rem}
.wordmark b{color:var(--acc-text)}
.tag{color:var(--text-3);font-size:.82rem;font-weight:600}
main{max-width:880px;margin:0 auto;padding:1.4rem 1.25rem 5.5rem}
.crumbs{max-width:880px;margin:0 auto;padding:.7rem 1.25rem 0;font-size:.8rem;color:var(--text-3);font-weight:600}
.crumbs a{color:var(--text-3)}
h1{font-family:var(--font-display);font-weight:700;font-size:clamp(1.5rem,4vw,2.3rem);line-height:1.22;margin:.4rem 0 .6rem;
  background:linear-gradient(120deg,var(--text) 60%,var(--acc-text));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
h2{font-family:var(--font-display);font-weight:600;font-size:1.26rem;margin:2.2rem 0 .7rem}
h3{font-size:1rem;margin:1.2rem 0 .35rem;color:var(--text-2);font-weight:800}
a{color:var(--acc2-text)}
.lede{color:var(--text-2);margin-bottom:1.2rem;font-size:1.05rem}
.lede strong{color:var(--acc-text)}
.calc{background:var(--surface);border:1px solid var(--border);border-radius:18px;padding:1.2rem;margin:1.3rem 0;box-shadow:var(--sh-rest)}
.frow{display:flex;gap:.7rem;flex-wrap:wrap;margin-bottom:.9rem}
.field{display:flex;flex-direction:column;gap:.3rem;flex:1;min-width:130px}
.field label{font-size:.78rem;font-weight:800;color:var(--text-3);text-transform:uppercase;letter-spacing:.04em}
.field input,.field select{background:var(--inset);color:var(--text);border:1px solid var(--border);border-radius:12px;
  padding:.65rem .8rem;font:inherit;font-weight:800;font-size:1.1rem;min-height:52px;width:100%}
.field input:focus,.field select:focus{outline:2px solid var(--acc);outline-offset:-1px;border-color:var(--acc)}
.go{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;background:linear-gradient(180deg,var(--acc),var(--acc-deep));
  color:#fff;text-shadow:0 1px 2px rgb(0 0 0/.2);border:0;border-radius:13px;padding:.8rem 1.7rem;font:inherit;font-weight:800;font-size:1.05rem;
  cursor:pointer;min-height:52px;box-shadow:var(--sh-cta);transition:transform var(--t-press) var(--ease-press),box-shadow var(--t-press) var(--ease-press)}
.go:hover{transform:translateY(-2px);box-shadow:var(--sh-cta-hover)}
.go:active{transform:translateY(1px) scale(.97);box-shadow:var(--sh-press)}
.go .ic{display:inline-block}
.go.rolling .ic{animation:cap-toss 500ms var(--ease-pop)}
.rowbtn{display:flex;gap:.7rem;flex-wrap:wrap;align-items:center}
.addrow{background:var(--inset);border:1px dashed var(--border);border-radius:12px;color:var(--text-2);font:inherit;font-weight:800;
  padding:.6rem 1rem;min-height:48px;cursor:pointer}
.addrow:hover{border-color:var(--acc);color:var(--acc-text)}
.verdict{margin-top:1.1rem;background:var(--inset);border:1px solid var(--border);border-radius:16px;padding:1.1rem;box-shadow:var(--sh-rest)}
.verdict.pop{animation:card-in 380ms var(--ease-pop) both}
.verdict .big{font-family:var(--font-display);font-weight:700;font-size:clamp(1.9rem,6vw,2.8rem);line-height:1.1}
.verdict .big .grade{color:var(--acc-text)}
.verdict .sub{color:var(--text-2);font-weight:700;margin-top:.3rem}
.verdict.good{border-color:var(--good)} .verdict.warn{border-color:var(--warn)} .verdict.bad{border-color:var(--bad)}
.verdict.good .big .grade{color:var(--good)} .verdict.warn .big .grade{color:var(--warn)} .verdict.bad .big .grade{color:var(--bad)}
.pills{list-style:none;display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:.55rem;margin-top:.9rem}
.pills li{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:.6rem .8rem;box-shadow:var(--sh-rest);cursor:pointer;
  transition:transform var(--t-hover) var(--ease-out),box-shadow var(--t-hover) var(--ease-out),border-color var(--t-hover)}
.pills li:hover{transform:translateY(-3px);box-shadow:var(--sh-lift);border-color:var(--acc)}
.pills li:active{transform:scale(.97)}
.pills li.copied{animation:copy-pop 300ms var(--ease-pop);outline:2px solid var(--acc);outline-offset:-1px}
.pills .k{font-size:.75rem;font-weight:800;color:var(--text-3);text-transform:uppercase;letter-spacing:.04em}
.pills .v{font-family:var(--font-display);font-weight:700;font-size:1.3rem}
.hint{color:var(--text-3);font-size:.8rem;font-weight:600;margin-top:.85rem}
.prose p{margin:.5rem 0;color:var(--text-2)}
.prose strong{color:var(--text)}
table{width:100%;border-collapse:collapse;margin:.8rem 0;background:var(--surface);border-radius:12px;overflow:hidden;box-shadow:var(--sh-rest)}
th,td{text-align:left;padding:.6rem .8rem;border-bottom:1px solid var(--border);font-size:.92rem}
th{color:var(--text-3);font-weight:800;font-size:.76rem;text-transform:uppercase;letter-spacing:.05em}
td:first-child{font-family:var(--font-display);font-weight:600}
tr:last-child td{border-bottom:0}
td .L{font-weight:800}
.L.good{color:var(--good)} .L.warn{color:var(--warn)} .L.bad{color:var(--bad)}
.links{list-style:none;display:flex;flex-wrap:wrap;gap:.45rem}
.links li a{display:inline-flex;align-items:center;background:var(--surface);border:1px solid var(--border);border-radius:22px;
  padding:.42rem .95rem;font-size:.87rem;font-weight:700;text-decoration:none;color:var(--text-2);box-shadow:var(--sh-rest);min-height:44px;
  transition:transform var(--t-hover) var(--ease-out),box-shadow var(--t-hover) var(--ease-out),border-color var(--t-hover),color var(--t-hover)}
.links li a:hover{transform:translateY(-2px);box-shadow:var(--sh-lift);border-color:var(--acc2);color:var(--acc2-text)}
.cards{list-style:none;display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));gap:.7rem;margin-top:.6rem}
.cards a{display:block;background:var(--surface);border:1px solid var(--border);border-radius:16px;padding:1rem;text-decoration:none;color:var(--text);
  box-shadow:var(--sh-rest);transition:transform var(--t-hover) var(--ease-out),box-shadow var(--t-hover) var(--ease-out),border-color var(--t-hover)}
.cards a:hover{transform:translateY(-4px);box-shadow:var(--sh-lift);border-color:var(--acc)}
.cards strong{display:block;font-family:var(--font-display);font-size:1.06rem;margin-bottom:.25rem}
.cards span{color:var(--text-3);font-size:.8rem;font-weight:600}
details{background:var(--surface);border:1px solid var(--border);border-radius:12px;margin:.5rem 0;box-shadow:var(--sh-rest)}
summary{padding:.8rem 1rem;font-weight:800;cursor:pointer;min-height:48px;display:flex;align-items:center}
details p{padding:0 1rem .9rem;color:var(--text-2)}
#toast{position:fixed;left:50%;bottom:5.4rem;transform:translate(-50%,16px);background:var(--text);color:var(--bg);
  padding:.6rem 1.1rem;border-radius:12px;font-weight:800;font-size:.9rem;opacity:0;pointer-events:none;z-index:60;
  box-shadow:var(--sh-lift);transition:opacity 180ms var(--ease-out),transform 220ms var(--ease-pop)}
#toast.show{opacity:1;transform:translate(-50%,0)}
#fab{position:fixed;left:50%;transform:translate(-50%,90px);bottom:calc(.9rem + env(safe-area-inset-bottom) + 8px);z-index:49;
  background:linear-gradient(180deg,var(--acc),var(--acc-deep));color:#fff;text-shadow:0 1px 2px rgb(0 0 0/.2);border:0;border-radius:16px;
  padding:.85rem 1.9rem;font:inherit;font-weight:800;font-size:1.05rem;cursor:pointer;box-shadow:var(--sh-cta-hover);min-height:52px;
  opacity:0;pointer-events:none;transition:transform 260ms var(--ease-pop),opacity 200ms var(--ease-out)}
#fab.show{opacity:1;pointer-events:auto;transform:translate(-50%,0)}
#fab:active{transform:translate(-50%,2px) scale(.96)}
footer{border-top:1px solid var(--border);padding:1.6rem 1.25rem calc(1.6rem + env(safe-area-inset-bottom));color:var(--text-3);font-size:.85rem;text-align:center;background:var(--surface)}
footer nav{display:flex;gap:1.1rem;justify-content:center;flex-wrap:wrap;margin-bottom:.6rem;font-weight:700}
footer a{color:var(--text-3)}
@keyframes cap-toss{0%{transform:rotate(0) translateY(0)}40%{transform:rotate(-18deg) translateY(-7px)}70%{transform:rotate(10deg) translateY(2px)}100%{transform:rotate(0) translateY(0)}}
@keyframes card-in{from{opacity:0;transform:translateY(14px) scale(.96)}to{opacity:1;transform:translateY(0) scale(1)}}
@keyframes copy-pop{0%{transform:scale(1)}40%{transform:scale(1.06)}100%{transform:scale(1)}}
@media(max-width:640px){header{padding:.75rem 1rem}.tag{display:none}main{padding:1rem 1rem 6.5rem}}
@media(max-width:420px){.go{width:100%;white-space:nowrap}.addrow{width:100%}}
@media(prefers-reduced-motion:reduce){*{animation-duration:.01ms!important;transition-duration:.01ms!important;scroll-behavior:auto}}