/* Ingenieros Civiles — sistema de diseño (claro / oscuro)
   Azul acero como color principal, ámbar quemado como señal de atención. */

:root{
  color-scheme:light;
  --bg:#2F6F55;
  --mat-minor:rgba(255,255,255,.075);
  --mat-major:rgba(255,255,255,.16);
  --on-mat:#F2F8F4;
  --on-mat-soft:#DCEBE2;
  --chalk:#FFD166;
  --surface:#FFFFFF;
  --surface-2:#F5F7FA;
  --field:#F5F7FA;
  --ink:#0F1E36;
  --ink-soft:#2B3A52;
  --muted:#4A5A72;
  --line:#D3DBE6;
  --line-strong:#7D90AB;
  --rule:rgba(15,30,54,.14);
  --grid-line:rgba(15,30,54,.07);
  --primary:#1B5FAA;
  --on-primary:#FFFFFF;
  --primary-soft:rgba(27,95,170,.14);
  --flag:#B8480A;
  --selected:#E3EDF9;
  --hdr-bg:#0D2119;
  --hdr-ink:#EAF0F8;
  --ring:rgba(27,95,170,.28);
  --shadow:0 1px 2px rgba(15,30,54,.06),0 10px 28px -14px rgba(15,30,54,.22);
  /* colores de los dibujos */
  --teal:var(--primary);
  --concrete:#C9D3E0;
  --concrete-2:#DDE3EC;
  --concrete-3:#B7C3D3;
  --c-green:#2F7D32;
  --c-blue:#2A6FB0;
  --c-sand:#C7B27A;
  --c-water:#BBD6EE;
  --c-grey:#7F8FA6;
  --paper:var(--surface-2);
  --gutter:clamp(16px,4vw,48px);
  --r:10px;
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    color-scheme:dark;
    --bg:#0E2119;
    --mat-minor:rgba(190,255,225,.055);
    --mat-major:rgba(190,255,225,.12);
    --surface:#121A26;
    --surface-2:#172131;
    --field:#0D141E;
    --ink:#E6ECF5;
    --ink-soft:#C2CEDF;
    --muted:#9AAEC7;
    --line:#243247;
    --line-strong:#5C7192;
    --rule:rgba(160,190,230,.20);
    --grid-line:rgba(150,180,220,.09);
    --primary:#7DB3F7;
    --on-primary:#08121F;
    --primary-soft:rgba(125,179,247,.22);
    --flag:#FF9D5C;
    --selected:#1B3350;
    --hdr-bg:#08140F;
    --hdr-ink:#E6ECF5;
    --ring:rgba(125,179,247,.35);
    --shadow:none;
    --concrete:#31425B;
    --concrete-2:#3C4F6B;
    --concrete-3:#4A5F7E;
    --c-green:#63C77F;
    --c-blue:#6DB1F5;
    --c-sand:#9C8B58;
    --c-water:#2D5B88;
  }
}
:root[data-theme="dark"]{
  color-scheme:dark;
  --bg:#0E2119;
  --mat-minor:rgba(190,255,225,.055);
  --mat-major:rgba(190,255,225,.12);
  --surface:#121A26;
  --surface-2:#172131;
  --field:#0D141E;
  --ink:#E6ECF5;
  --ink-soft:#C2CEDF;
  --muted:#9AAEC7;
  --line:#243247;
  --line-strong:#5C7192;
  --rule:rgba(160,190,230,.20);
  --grid-line:rgba(150,180,220,.09);
  --primary:#7DB3F7;
  --on-primary:#08121F;
  --primary-soft:rgba(125,179,247,.22);
  --flag:#FF9D5C;
  --selected:#1B3350;
  --hdr-bg:#08140F;
  --hdr-ink:#E6ECF5;
  --ring:rgba(125,179,247,.35);
  --shadow:none;
  --concrete:#31425B;
  --concrete-2:#3C4F6B;
  --concrete-3:#4A5F7E;
  --c-green:#63C77F;
  --c-blue:#6DB1F5;
  --c-sand:#9C8B58;
  --c-water:#2D5B88;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
html{background:var(--bg)}
body{
  margin:0;color:var(--on-mat);min-height:100vh;min-height:100dvh;display:flex;flex-direction:column;
  font-family:"Archivo",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:17px;line-height:1.55;font-variant-numeric:tabular-nums;-webkit-font-smoothing:antialiased;
  background-color:var(--bg);
  background-image:
    radial-gradient(ellipse 80% 50% at 50% 0%,rgba(255,255,255,.10),transparent 70%),
    linear-gradient(var(--mat-major) 1.5px,transparent 1.5px),
    linear-gradient(90deg,var(--mat-major) 1.5px,transparent 1.5px),
    linear-gradient(var(--mat-minor) 1px,transparent 1px),
    linear-gradient(90deg,var(--mat-minor) 1px,transparent 1px);
  background-size:100% 100%,120px 120px,120px 120px,24px 24px,24px 24px;
  background-attachment:fixed;
}
main{flex:1 0 auto;width:100%}
header.top,main,footer{position:relative;z-index:1}
a{color:var(--primary);text-underline-offset:3px}
:focus-visible{outline:2px solid var(--primary);outline-offset:2px;border-radius:4px}
.wrap{max-width:1180px;margin:0 auto;padding:0 var(--gutter)}
::selection{background:var(--primary-soft)}

/* ---------- Cabecera ---------- */
header.top{background:var(--hdr-bg);color:var(--hdr-ink);border-bottom:1px solid rgba(255,255,255,.08)}
header.top .wrap{position:relative;display:flex;flex-direction:column;align-items:center;gap:4px;padding-top:16px;padding-bottom:0}
.brand{display:block;color:inherit;text-decoration:none;font-stretch:112%;font-weight:800;font-size:clamp(21px,4.2vw,28px);letter-spacing:.005em;text-align:center;line-height:1.2}
nav.main{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));width:100%;max-width:1120px}
nav.main a{color:inherit;display:flex;align-items:center;justify-content:center;min-height:50px;line-height:1.2;padding:8px 6px;text-align:center;text-decoration:none;font-weight:600;font-size:14.5px;border-bottom:3px solid transparent;opacity:.82;transition:opacity .15s,border-color .15s}
nav.main a:hover,nav.main a:focus-visible{opacity:1;border-bottom-color:var(--flag)}
nav.main a[aria-current="page"]{opacity:1;border-bottom-color:var(--flag)}
@media (max-width:980px){nav.main{grid-template-columns:repeat(3,minmax(0,1fr))}nav.main a{min-height:44px;font-size:14px}}
.theme{position:absolute;top:10px;right:var(--gutter);width:38px;height:38px;display:grid;place-items:center;padding:0;border:1px solid rgba(255,255,255,.28);border-radius:10px;background:transparent;color:var(--hdr-ink);cursor:pointer}
.theme:hover{background:rgba(255,255,255,.1)}
.theme.spin svg{animation:giro .55s cubic-bezier(.2,.9,.3,1.3)}
@keyframes giro{from{transform:rotate(-120deg) scale(.5);opacity:.3}}
.theme svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:2;stroke-linecap:round;stroke-linejoin:round}
.theme .i-sun{display:none}
:root[data-theme="dark"] .theme .i-sun{display:block}
:root[data-theme="dark"] .theme .i-moon{display:none}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]) .theme .i-sun{display:block}
  :root:not([data-theme="light"]) .theme .i-moon{display:none}
}
@media (max-width:360px){.theme{width:34px;height:34px;top:12px}.brand{font-size:20px}}

/* ---------- Mesa de dibujo (siluetas de instrumentos) ---------- */
.mesa{position:fixed;inset:0;z-index:0;overflow:hidden;pointer-events:none}
.mesa img{position:absolute;display:block;max-width:none;transition:transform .35s ease-out}
.mesa .r-escuadra{left:-70px;bottom:-90px;width:440px;transform:translate(calc(var(--mx,0)*16px),calc(var(--my,0)*16px)) rotate(-4deg)}
.mesa .r-transp{right:2%;bottom:-40px;width:400px;transform:translate(calc(var(--mx,0)*-12px),calc(var(--my,0)*-12px)) rotate(5deg)}
.mesa .r-escala{left:calc(100% - 26px);top:50%;width:960px;transform-origin:0 0;transform:translate(calc(var(--mx,0)*-10px),calc(-480px + var(--my,0)*-10px)) rotate(90deg)}
.mesa .r-lapiz{left:-190px;top:30%;width:640px;transform:translate(calc(var(--mx,0)*20px),calc(var(--my,0)*20px)) rotate(58deg)}
@media (max-width:720px){.mesa .r-escala,.mesa .r-lapiz{display:none}.mesa .r-escuadra{width:270px;left:-50px;bottom:-60px}.mesa .r-transp{width:250px}}

/* ---------- Portada ---------- */
.hero{text-align:center}
.hero .wrap{padding-top:clamp(34px,6vw,72px);padding-bottom:clamp(8px,2vw,20px)}
.hero h1{margin:0 auto;overflow-wrap:break-word;font-stretch:90%;font-weight:800;font-size:clamp(32px,5.8vw,60px);line-height:1.05;letter-spacing:-.012em;max-width:19ch;color:var(--on-mat);text-shadow:0 2px 0 rgba(0,0,0,.18);animation:subir .7s cubic-bezier(.2,.8,.2,1) backwards}
.trazo{display:block;margin:10px auto 0;width:min(300px,70%);height:14px;overflow:visible}
.trazo path{fill:none;stroke:var(--chalk);stroke-width:4;stroke-linecap:round;stroke-dasharray:1;stroke-dashoffset:1;animation:trazar 1.1s .4s ease-out forwards}
.hero p{max-width:58ch;margin:18px auto 24px;font-size:clamp(16px,2.1vw,19px);color:var(--on-mat-soft);animation:subir .7s .12s cubic-bezier(.2,.8,.2,1) backwards}
.sb{position:relative;max-width:600px;margin:0 auto;animation:subir .7s .22s cubic-bezier(.2,.8,.2,1) backwards}
.sb svg{position:absolute;left:18px;top:50%;transform:translateY(-50%);width:20px;height:20px;fill:none;stroke:var(--muted);stroke-width:2;stroke-linecap:round;pointer-events:none}
.sb .searchbox{display:block;width:100%;font:inherit;font-size:18px;padding:15px 16px 15px 50px;border:2px solid transparent;border-radius:999px;background:var(--surface);color:var(--ink);box-shadow:0 2px 0 rgba(0,0,0,.18),0 14px 30px -14px rgba(0,0,0,.6)}
.sb .searchbox::placeholder{color:var(--muted);opacity:1}
.sb .searchbox:focus{outline:none;border-color:var(--chalk);box-shadow:0 0 0 5px rgba(255,209,102,.35)}
#resultados{margin:18px auto 0;max-width:900px}
#resultados .chips{justify-content:center}
#resultados p{color:var(--on-mat)}
.home-main{padding-top:30px;padding-bottom:10px}
.titulo-mesa{margin:34px 0 18px;text-align:center;font-stretch:100%;font-weight:750;font-size:clamp(20px,2.6vw,25px);color:var(--on-mat)}

/* cursos: formas orgánicas, como piezas sobre la mesa */
.cursos{display:flex;flex-wrap:wrap;justify-content:center;gap:18px 16px;margin:0 auto;max-width:1020px;padding:0;list-style:none}
.curso{--rot:0deg;display:inline-flex;align-items:center;gap:12px;padding:10px 24px 10px 10px;background:var(--surface);color:var(--ink);border-radius:999px;text-decoration:none;font-weight:700;font-size:18px;line-height:1.2;
  box-shadow:0 3px 0 rgba(0,0,0,.2),0 14px 26px -12px rgba(0,0,0,.6);transform:rotate(var(--rot));
  transition:transform .28s cubic-bezier(.2,.9,.3,1.35),box-shadow .28s;
  animation:caer .75s cubic-bezier(.2,.9,.3,1.15) backwards;animation-delay:calc(var(--i)*75ms + .25s)}
.curso:nth-child(odd){--rot:-1.6deg}
.curso:nth-child(even){--rot:1.2deg}
.curso:nth-child(3n){--rot:.5deg}
.curso:nth-child(3n+2){border-radius:32px 10px 32px 10px}
.curso:nth-child(3n){border-radius:10px 32px 10px 32px}
.curso .ic{width:46px;height:46px;border-radius:50%;background:var(--primary-soft);display:grid;place-items:center;flex:none}
.curso svg{width:27px;height:27px;fill:none;stroke:var(--primary);stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round;overflow:visible}
.curso .mv{transform-box:fill-box;transform-origin:center}
.curso:hover,.curso:focus-visible{transform:rotate(0) translateY(-6px) scale(1.06);box-shadow:0 5px 0 rgba(0,0,0,.2),0 22px 34px -14px rgba(0,0,0,.7);outline:none}
.curso:focus-visible{box-shadow:0 0 0 4px var(--chalk),0 14px 26px -12px rgba(0,0,0,.6)}
.curso:hover .mv,.curso:focus-visible .mv{animation:mv-flex 1s ease-in-out infinite}
.c-estatica:hover .mv{animation:mv-carga .9s ease-in-out infinite}
.c-dinamica:hover .mv{animation:mv-rebote .8s ease-in-out infinite}
.c-hidraulica:hover .mv{animation:mv-ola 1.2s linear infinite}
.c-resistencia:hover .mv{animation:mv-tira .8s ease-in-out infinite}
.c-unidades:hover .mv{animation:mv-giro 1.4s ease-in-out infinite}
.c-topografia:hover .mv{animation:mv-gira 1.2s ease-in-out infinite}
.c-suelos:hover .mv{animation:mv-cae 1s ease-in infinite}
@keyframes mv-flex{50%{transform:scale(1.14)}}
@keyframes mv-carga{50%{transform:translateY(2.5px)}}
@keyframes mv-rebote{50%{transform:translateY(-3.5px)}}
@keyframes mv-ola{from{transform:translateX(-4px)}to{transform:translateX(0)}}
@keyframes mv-tira{50%{transform:scaleX(1.18)}}
@keyframes mv-giro{to{transform:rotate(180deg)}}
@keyframes mv-gira{0%,100%{transform:rotate(-14deg)}50%{transform:rotate(14deg)}}
@keyframes mv-cae{0%{transform:translateY(-2px);opacity:.3}100%{transform:translateY(2px);opacity:1}}

/* cajetín de normas (como el de un plano) */
.cajetin{max-width:900px;margin:52px auto 14px;background:var(--surface);color:var(--ink);border:2px solid var(--ink);box-shadow:0 0 0 4px var(--surface),0 0 0 6px var(--ink),0 22px 40px -18px rgba(0,0,0,.65);display:grid;grid-template-columns:minmax(150px,1.1fr) 3fr}
.cj-t{padding:16px 18px;font-weight:800;font-stretch:95%;font-size:17px;line-height:1.25;display:flex;flex-direction:column;justify-content:center;background:var(--surface-2);border-right:2px solid var(--ink)}
.cj-t small{font-weight:600;font-size:13px;color:var(--muted);margin-top:4px}
.cj-g{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,minmax(0,1fr))}
.cj-g li{padding:14px 12px;text-align:center;border-left:2px solid var(--ink);display:flex;flex-direction:column;justify-content:center}
.cj-g li:first-child{border-left:0}
.cj-g b{font-stretch:92%;font-weight:850;font-size:26px;line-height:1;color:var(--primary)}
.cj-g span{font-size:14px;color:var(--ink-soft);margin-top:5px;line-height:1.25}
@media (max-width:760px){.cajetin{grid-template-columns:1fr}.cj-t{border-right:0;border-bottom:2px solid var(--ink)}.cj-g{grid-template-columns:repeat(2,minmax(0,1fr))}.cj-g li:nth-child(3){border-left:0}.cj-g li:nth-child(n+3){border-top:2px solid var(--ink)}}

/* ---------- Opciones (chips) ---------- */
.chips{display:flex;flex-wrap:wrap;gap:12px}
.chip{display:inline-flex;align-items:center;gap:8px;padding:11px 20px;border-radius:999px;background:var(--surface);color:var(--ink);text-decoration:none;font-weight:650;font-size:16.5px;line-height:1.2;
  box-shadow:0 2px 0 rgba(0,0,0,.18),0 10px 20px -12px rgba(0,0,0,.55);
  transition:transform .22s cubic-bezier(.2,.9,.3,1.35),background .15s,color .15s;
  animation:subir .5s cubic-bezier(.2,.8,.2,1) backwards;animation-delay:calc(var(--i,0)*45ms)}
.chip:hover,.chip:focus-visible{transform:translateY(-4px) scale(1.04);background:var(--primary);color:var(--on-primary);outline:none}
.chip:focus-visible{box-shadow:0 0 0 4px var(--chalk)}
.chip small{font-size:12.5px;opacity:.7;font-weight:600}
.grupo{margin:30px 0}
.grupo h2{margin:0 0 14px;font-stretch:100%;font-weight:750;font-size:20px;color:var(--on-mat);display:flex;align-items:center;gap:14px}
.grupo h2::after{content:"";flex:1;height:2px;background:linear-gradient(90deg,var(--chalk),transparent);opacity:.55;transform-origin:left;animation:ancho .9s .15s ease-out backwards}
@keyframes ancho{from{transform:scaleX(0)}}

/* ---------- Páginas interiores ---------- */
.crumbs{font-size:14px;color:var(--on-mat-soft);margin:22px 0 6px}
.crumbs a{color:var(--on-mat)}
.crumbs a:hover{color:var(--chalk)}
.pagehead h1{font-stretch:92%;font-weight:800;font-size:clamp(30px,5vw,50px);line-height:1.05;letter-spacing:-.01em;margin:6px 0 4px;max-width:26ch;overflow-wrap:break-word;color:var(--on-mat);text-shadow:0 2px 0 rgba(0,0,0,.18);animation:subir .6s cubic-bezier(.2,.8,.2,1) backwards}
.hubhead{padding:24px 0 4px;display:flex;align-items:center;gap:18px}
.hub-ic{width:76px;height:76px;border-radius:22px 8px 22px 8px;background:var(--surface);display:grid;place-items:center;flex:none;box-shadow:0 3px 0 rgba(0,0,0,.2),0 14px 26px -12px rgba(0,0,0,.6);transform:rotate(-3deg);animation:caer .7s cubic-bezier(.2,.9,.3,1.15) backwards}
.hub-ic svg{width:44px;height:44px;fill:none;stroke:var(--primary);stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.hubhead h1{font-stretch:92%;font-weight:800;font-size:clamp(32px,5.4vw,56px);line-height:1.02;letter-spacing:-.012em;margin:0;color:var(--on-mat);text-shadow:0 2px 0 rgba(0,0,0,.18);overflow-wrap:break-word;min-width:0}
.settingsbar{display:flex;gap:10px 22px;flex-wrap:wrap;margin:14px 0 14px;font-size:14px;color:var(--on-mat)}
.settingsbar label{display:flex;gap:8px;align-items:center;flex-wrap:wrap}
.legal{max-width:820px;margin:26px auto 0;padding:clamp(20px,4vw,40px);overflow-wrap:anywhere;background:var(--surface);color:var(--ink);border-radius:16px;box-shadow:var(--shadow),0 18px 40px -22px rgba(0,0,0,.6);animation:subir .6s cubic-bezier(.2,.8,.2,1) backwards}
.legal h1{font-stretch:92%;font-weight:800;font-size:clamp(30px,5vw,46px);line-height:1.05;margin:0 0 6px}
.legal h2{font-size:22px;margin:30px 0 6px;color:var(--ink)}
.legal p,.legal li{font-size:17px;line-height:1.6;color:var(--ink-soft)}
.legal small{color:var(--muted)}
.legal a{color:var(--primary)}

/* ---------- Hoja de cálculo ---------- */
.sheet{background:var(--surface);color:var(--ink);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow),0 22px 44px -24px rgba(0,0,0,.65);margin:10px 0 40px;animation:subir .65s .1s cubic-bezier(.2,.8,.2,1) backwards}
.sheet-body{padding:clamp(16px,2.6vw,32px)}
.sheet h2{margin:0 0 6px;font-stretch:92%;font-weight:800;font-size:clamp(26px,4vw,40px);line-height:1.05}
.sheet .lede{margin:0 0 20px;color:var(--muted);max-width:64ch;font-size:15px}
h3{margin:22px 0 10px;font-stretch:100%;font-weight:750;font-size:20px;line-height:1.15}
.col>h3:first-child{margin-top:0}
.col,.sheet-body{min-width:0}

/* ---------- Controles ---------- */
.tool{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:28px;align-items:start}
@media (max-width:900px){.tool{grid-template-columns:1fr}}
.controls{display:grid;gap:14px}
.field label,.field .lab{display:flex;justify-content:space-between;font-weight:600;font-size:15px;margin-bottom:5px;color:var(--ink)}
.field output{font-weight:700;color:var(--primary)}
.field[hidden]{display:none}
input[type=range]{width:100%;accent-color:var(--primary);height:28px}
input[type=text],input[type=number],input[type=search],select,textarea{
  width:100%;font:inherit;font-size:16px;padding:9px 12px;background:var(--field);color:var(--ink);
  border:1px solid var(--line-strong);border-radius:8px;
}
input[type=text]{font-size:18px;font-weight:600}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--ring)}
textarea{resize:vertical;font-variant-numeric:tabular-nums}
select{cursor:pointer}
.row2{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.row3{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}
.hint{font-size:14px;color:var(--muted);margin:10px 0 0}
.err{color:var(--flag);font-weight:650;margin:8px 0 0;min-height:1.5em}
.legend{display:flex;gap:18px;flex-wrap:wrap;font-size:14px;margin:10px 0 0;color:var(--ink-soft)}
.legend i{display:inline-block;width:22px;height:4px;border-radius:2px;vertical-align:middle;margin-right:6px}

/* ---------- Resultados ---------- */
.readout{display:grid;grid-template-columns:minmax(0,1fr);border:1px solid var(--line);border-radius:var(--r);background:var(--surface-2);overflow:hidden}
.readout div{display:flex;justify-content:space-between;align-items:baseline;gap:10px;padding:10px 14px;border-top:1px solid var(--line)}
.readout div:first-child{border-top:0}
.readout span{font-size:15px;color:var(--muted)}
.readout strong{font-stretch:92%;font-weight:750;font-size:23px;color:var(--ink)}
.readout em{font-style:normal;font-size:14px;color:var(--muted);font-weight:500;margin-left:3px}
.readout .hot strong{color:var(--flag)}
.readout .val{display:flex;align-items:baseline;gap:8px;justify-content:flex-end;text-align:right}
.readout select{width:auto;padding:3px 6px;font-size:14px}
.readout strong.txt{font-stretch:95%;font-size:17px;font-weight:700}
.readout .warnrow{color:var(--flag);font-weight:650;font-size:15px}
@media (max-width:520px){.readout div{flex-wrap:wrap}.readout .val{margin-left:auto}}

/* ---------- Dibujos ---------- */
svg.plot{display:block;width:100%;height:auto;border:1px solid var(--line);border-radius:var(--r);touch-action:none;user-select:none;
  background:
    linear-gradient(var(--grid-line) 1px,transparent 1px) 0 0/40px 40px,
    linear-gradient(90deg,var(--grid-line) 1px,transparent 1px) 0 0/40px 40px,var(--surface)}
svg.plot text{font-family:"Archivo",sans-serif;font-size:13px;fill:var(--ink)}
svg.plot .cap{font-weight:700;font-size:14px}
svg.plot .soft{fill:var(--muted)}
.drag{cursor:ew-resize}
/* colores fijos del dibujo, adaptados al tema */
svg.plot [fill="#fff"],svg.plot [fill="#ffffff"],svg.plot [style*="fill:#fff"]{fill:var(--surface)!important}
svg.plot [fill="#2f7d32"],svg.plot [style*="fill:#2f7d32"]{fill:var(--c-green)!important}
svg.plot [stroke="#2f7d32"]{stroke:var(--c-green)}
svg.plot [fill="#2a6fb0"],svg.plot [style*="fill:#2a6fb0"]{fill:var(--c-blue)!important}
svg.plot [stroke="#2a6fb0"]{stroke:var(--c-blue)}
svg.plot [fill="#c7b27a"]{fill:var(--c-sand)}
svg.plot [fill="#b8d4d0"]{fill:var(--c-water)}
svg.plot [fill="#8a8f8c"],svg.plot [style*="fill:#8a8f8c"]{fill:var(--c-grey)!important}
svg.plot [stroke="#8a8f8c"]{stroke:var(--c-grey)}
svg.plot [fill="#d9d6cc"],svg.plot [fill="#e4e2d9"],svg.plot [fill="#e6e5de"],svg.plot [fill="#e7e5dc"]{fill:var(--concrete-2)}
svg.plot [fill="#c7c5bb"],svg.plot [fill="#c4c3bb"]{fill:var(--concrete-3)}
svg.plot [stroke="rgba(0,0,0,.1)"],svg.plot [stroke="rgba(0,0,0,.12)"],svg.plot [stroke="rgba(0,0,0,.15)"]{stroke:var(--rule)}
svg.plot [stroke="rgba(0,0,0,.25)"]{stroke:var(--line-strong)}
svg.plot [fill="rgba(15,106,91,.35)"]{fill:var(--primary-soft)}

/* ---------- Tablas ---------- */
table{width:100%;border-collapse:separate;border-spacing:0;background:var(--surface);border:1px solid var(--line);border-radius:var(--r);overflow:hidden}
th,td{padding:9px 14px;text-align:left;border-top:1px solid var(--line);font-size:16px}
th{font-weight:700;background:var(--surface-2);border-top:0;font-size:14px;color:var(--ink-soft)}
td.n{text-align:right;font-weight:650}
tr.sel td{background:var(--selected)}
.scroll{overflow-x:auto}
.courses td:first-child{font-stretch:95%;font-weight:750;font-size:18px;white-space:nowrap}
.tag{display:inline-block;padding:2px 9px;font-size:13px;font-weight:650;border:1px solid var(--line-strong);border-radius:999px}
.tag.soon{border-style:dashed;color:var(--muted)}
.tag.live{background:var(--primary);color:var(--on-primary);border-color:var(--primary)}

/* ---------- Cargas y editores ---------- */
.beam-grid{display:grid;grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:32px;margin-top:26px;align-items:start}
@media (max-width:960px){.beam-grid{grid-template-columns:1fr}}
.pair>*,.pair3>*{min-width:0}
.stack{display:grid;gap:12px;margin-bottom:12px}
.load{border:1px solid var(--line);border-radius:var(--r);background:var(--surface-2);padding:12px 14px;display:grid;gap:10px}
.load-head{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.load-head strong{font-stretch:95%;font-weight:750;font-size:18px;margin-right:auto}
.load-head select{width:auto;min-width:0;flex:0 1 220px}
.pair{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,112px);gap:6px}
.pair3{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr) 92px;gap:6px}
.load .field .lab{display:block;font-weight:600;font-size:14px;color:var(--muted)}
.ptrow{display:grid;grid-template-columns:70px minmax(0,1fr) auto;gap:8px;align-items:center}
.gen-grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
@media (max-width:900px){.gen-grid{grid-template-columns:minmax(0,1fr)}}

/* ---------- Botones ---------- */
.btn,.actions button,.tab{font:inherit;font-weight:650;font-size:15px;padding:9px 16px;border:1px solid var(--line-strong);border-radius:8px;background:var(--surface);color:var(--ink);cursor:pointer;transition:background .15s,border-color .15s}
.btn:hover,.actions button:hover,.tab:hover{background:var(--surface-2);border-color:var(--primary);color:var(--primary)}
.btn.small{padding:6px 10px;font-size:14px}
.actions button{font-size:14px;font-weight:600;padding:7px 12px}
.tabs{display:flex;flex-wrap:wrap;gap:6px;margin:0 0 22px}
.tab[aria-selected="true"]{background:var(--primary);border-color:var(--primary);color:var(--on-primary)}
.actions{display:flex;flex-wrap:wrap;gap:8px;align-items:center;margin:12px 0 0}
.actmsg{font-size:14px;color:var(--primary);font-weight:700}
.settings{display:flex;flex-wrap:wrap;gap:10px 22px;margin:18px 0 0;font-size:14px;font-weight:600}
.settings label{display:flex;align-items:center;gap:8px}
.settings select{width:auto;font-size:14px;padding:6px 8px}

/* ---------- Procedimiento ---------- */
.proc{margin-top:26px;border:1px solid var(--line);border-radius:var(--r);background:var(--surface-2);overflow:hidden}
.proc summary{cursor:pointer;padding:14px 18px;font-weight:750;font-size:18px;font-stretch:95%;list-style-position:inside}
.proc summary:hover{background:var(--selected)}
.proc[open] summary{border-bottom:1px solid var(--line)}
#procBody,.procBody{padding:6px 22px 22px;max-width:880px}
#procBody h4,.procBody h4{margin:22px 0 8px;font-stretch:100%;font-weight:750;font-size:18px}
#procBody p,#procBody li,.procBody p,.procBody li{margin:6px 0;color:var(--ink-soft)}
#procBody ul,.procBody ul{padding-left:20px;margin:6px 0}
#procBody .eq,.procBody .eq{padding:9px 14px;background:var(--surface);border-left:4px solid var(--primary);border-radius:0 8px 8px 0;overflow-x:auto;color:var(--ink)}
#procBody .note,.procBody .note{color:var(--muted);font-size:15px}
#procBody table,.procBody table{margin:8px 0}
.gen details.proc,.sheet-body>div>details.proc{margin-top:22px}
pre.lines{margin:6px 0;padding:8px 10px;background:var(--field);border:1px solid var(--line);border-radius:8px;font:13px/1.5 ui-monospace,Consolas,monospace;white-space:pre-wrap;color:var(--ink)}
.notes details{margin:10px 0;border:1px solid var(--line);border-radius:var(--r);background:var(--surface-2);padding:0 14px}
.notes summary{cursor:pointer;font-weight:700;padding:12px 0}
.notes li,.notes p{max-width:80ch;font-size:15px;line-height:1.55}

/* ---------- Publicidad ---------- */
.ad{display:none;max-width:1180px;margin:40px auto;padding:0 var(--gutter);text-align:center}
.ad.on{display:block}
.ad small{display:block;font-size:12px;color:var(--on-mat-soft);margin-bottom:6px}
.ad ins{display:block;min-height:100px}

/* ---------- Pie (siempre al final de la pantalla) ---------- */
footer{flex-shrink:0;background:var(--hdr-bg);color:var(--hdr-ink);padding:26px 0;font-size:14px;margin-top:48px;border-top:1px solid rgba(255,255,255,.08)}
footer .wrap{display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap}
footer span{opacity:.75}
footer nav{display:flex;gap:16px;flex-wrap:wrap}
footer nav a{color:inherit;opacity:.85}
footer nav a:hover{opacity:1}
.printhead{display:none}

/* ---------- Animaciones ---------- */
@keyframes subir{from{opacity:0;transform:translateY(16px)}}
@keyframes caer{from{opacity:0;transform:translateY(-38px) rotate(calc(var(--rot,0deg)*-5 - 7deg)) scale(.9)}}
@keyframes trazar{to{stroke-dashoffset:0}}
@keyframes aparecer{from{opacity:0}}
@keyframes destello{0%{background:var(--primary-soft);box-shadow:0 0 0 6px var(--primary-soft);border-radius:6px}100%{background:transparent;box-shadow:0 0 0 6px transparent;border-radius:6px}}
.readout strong.flash{animation:destello .95s ease-out}
.field:focus-within>label,.field:focus-within>.lab{color:var(--primary)}
.btn:active,.actions button:active,.tab:active,.chip:active,.curso:active{transform:scale(.96)}
details[open]>*:not(summary){animation:subir .35s ease-out}
/* los dibujos se trazan al aparecer */
svg.plot.anim line,svg.plot.anim polyline,svg.plot.anim path{stroke-dasharray:1;stroke-dashoffset:1;animation:trazar 1.1s ease-out forwards}
svg.plot.anim rect,svg.plot.anim polygon,svg.plot.anim circle,svg.plot.anim text{animation:aparecer .9s .25s ease-out backwards}
[data-reveal]{opacity:0;transform:translateY(22px);transition:opacity .6s ease,transform .6s cubic-bezier(.2,.8,.2,1)}
[data-reveal].in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
  .trazo path{stroke-dashoffset:0}
  [data-reveal]{opacity:1;transform:none}
  svg.plot.anim line,svg.plot.anim polyline,svg.plot.anim path{stroke-dasharray:none;stroke-dashoffset:0}
}

/* ---------- Impresión: siempre en claro ---------- */
@media print{
  html:root[data-theme]{
    --bg:#fff;--surface:#fff;--surface-2:#fff;--field:#fff;--ink:#0F1E36;--ink-soft:#2B3A52;--muted:#4A5A72;
    --line:#C9D3E0;--line-strong:#7D90AB;--rule:rgba(15,30,54,.14);--grid-line:rgba(15,30,54,.07);
    --primary:#1B5FAA;--flag:#B8480A;--selected:#E3EDF9;--shadow:none;
  }
  .ad{display:none!important}
  header,footer,.hero,.intro,.tabs,.actions,nav,.settings,.settingsbar,.mesa,.crumbs,.pagehead,.grupo{display:none!important}
  body.printing .sheet:not(.printing){display:none!important}
  body.printing .notes{display:none!important}
  .printhead{display:block;font-weight:700;margin:0 0 10px}
  details.proc{border:none}
  svg.plot{max-width:100%}
  body{background:#fff!important;color:#000}
  .sheet{box-shadow:none}
}

/* ---------- guía por calculadora, avisos y contacto ---------- */
.guia{max-width:860px;margin:34px auto 0;padding:clamp(20px,4vw,38px);background:var(--surface);color:var(--ink);border-radius:16px;box-shadow:var(--shadow),0 18px 40px -22px rgba(0,0,0,.6);overflow-wrap:anywhere}
.guia h2{font-size:22px;margin:28px 0 6px;color:var(--ink)}
.guia h2:first-child{margin-top:0}
.guia h3{font-size:15px;margin:0 0 6px;color:var(--muted);font-weight:700}
.guia p,.guia li{font-size:17px;line-height:1.62;color:var(--ink-soft);max-width:70ch}
.guia ul{padding-left:20px;margin:6px 0}
.guia .formulas{list-style:none;padding:0}
.guia .formulas li{margin:6px 0}
.guia code,.legal code{font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;font-size:15px;background:var(--surface-2);padding:3px 8px;border-radius:6px;color:var(--ink);display:inline-block;max-width:100%;overflow-wrap:anywhere}
.guia .ej{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.guia .tej{width:100%;border-collapse:collapse;font-size:15px}
.guia .tej th,.guia .tej td{padding:7px 8px;border-bottom:1px solid var(--line,rgba(127,127,127,.25));text-align:left;vertical-align:top;white-space:pre-line}
.guia .tej th{font-weight:600;color:var(--ink-soft);width:52%}
.guia .tej td{color:var(--ink);font-variant-numeric:tabular-nums}
.guia details.faq{border-top:1px solid var(--line,rgba(127,127,127,.25));padding:10px 0}
.guia details.faq summary{cursor:pointer;font-weight:700;color:var(--ink);font-size:17px}
.guia details.faq p{margin:8px 0 0}
.guia .nota{margin-top:24px;font-size:15px;color:var(--muted)}
.guia a{color:var(--primary)}
.hubtxt{max-width:760px;margin:34px auto 0;padding:clamp(18px,3vw,28px);background:var(--surface);color:var(--ink);border-radius:16px;box-shadow:var(--shadow)}
.hubtxt h2{font-size:21px;margin:0 0 6px}.hubtxt p{font-size:17px;line-height:1.62;color:var(--ink-soft);margin:0}
.mailcard{margin:18px 0}
.mailcard .mail{display:inline-block;font-size:clamp(18px,3.6vw,26px);font-weight:800;color:var(--primary);text-decoration:none;border-bottom:3px solid var(--chalk);padding-bottom:2px;overflow-wrap:anywhere}
.mailbtns{display:flex;flex-wrap:wrap;gap:10px;margin:6px 0 10px}
.mailbtns .btn{display:inline-block;padding:11px 18px;border-radius:999px;background:var(--primary);color:#fff;text-decoration:none;font-weight:700;font-size:16px;transition:transform .18s}
.mailbtns .btn:hover{transform:translateY(-2px)}
:root[data-theme="dark"] .mailbtns .btn{color:#08140F}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .mailbtns .btn{color:#08140F}}
footer .linkbtn{background:none;border:0;padding:0;font:inherit;color:inherit;text-decoration:underline;cursor:pointer}
footer .linkbtn[hidden]{display:none}
.cookies{position:fixed;left:50%;bottom:16px;transform:translateX(-50%);z-index:60;width:min(720px,calc(100% - 24px));display:flex;gap:16px;align-items:center;flex-wrap:wrap;padding:16px 18px;background:var(--surface);color:var(--ink);border-radius:14px;box-shadow:0 14px 40px rgba(0,0,0,.45);animation:subir .4s ease backwards}
.cookies p{margin:0;flex:1 1 280px;font-size:15px;line-height:1.5;color:var(--ink-soft)}
.cookies a{color:var(--primary)}
.cookies-b{display:flex;gap:8px;flex-wrap:wrap}
.cookies button{font:inherit;font-weight:700;font-size:15px;padding:10px 16px;border-radius:999px;cursor:pointer;border:2px solid var(--primary);background:transparent;color:var(--primary)}
.cookies button.ck-all{background:var(--primary);color:#fff}
:root[data-theme="dark"] .cookies button.ck-all{color:#08140F}
@media (prefers-color-scheme:dark){:root:not([data-theme="light"]) .cookies button.ck-all{color:#08140F}}
@media (max-width:640px){.guia .ej{grid-template-columns:1fr}}
@media print{.cookies{display:none!important}.guia{box-shadow:none}}
.terms{flex-direction:column;align-items:flex-start;gap:10px}
.terms label{display:flex;gap:10px;align-items:center;font-size:16px;color:var(--ink);cursor:pointer}
.terms input[type=checkbox]{width:20px;height:20px;accent-color:var(--primary)}
.cookies button:disabled{opacity:.45;cursor:not-allowed}
.terms p{flex:0 0 auto}

/* ---------- fórmulas ---------- */
.guia .fgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,360px),1fr));gap:16px;margin:10px 0 4px}
.fcard{margin:0;min-width:0;background:var(--surface-2);border:1px solid var(--line);border-left:5px solid var(--primary);border-radius:6px 16px 16px 6px;overflow:hidden;display:flex;flex-direction:column}
.fcard figcaption{padding:9px 14px;font-size:14px;font-weight:700;color:var(--muted);letter-spacing:.01em;border-bottom:1px dashed var(--line)}
.fcard .ftex{padding:16px 10px;text-align:center;overflow-x:auto;overflow-y:hidden;color:var(--ink);font-size:1.12em;background-image:linear-gradient(rgba(127,127,127,.13) 1px,transparent 1px),linear-gradient(90deg,rgba(127,127,127,.13) 1px,transparent 1px);background-size:16px 16px;background-position:center}
.fcard .katex-display{margin:0;overflow:visible}
.fcard .katex-display>.katex{white-space:nowrap}
.fdonde{margin:0;padding:10px 14px 4px;display:grid;gap:5px}
.fdonde>div{display:flex;gap:10px;align-items:baseline}
.fdonde dt{flex:none;min-width:3.2em;text-align:right;color:var(--primary);font-size:.95em}
.fdonde dd{margin:0;font-size:14px;line-height:1.4;color:var(--ink-soft)}
.fdonde .solo dd{color:var(--muted)}
.fnota{margin:0;padding:8px 14px 12px;font-size:13.5px;line-height:1.45;color:var(--muted);border-top:1px dashed var(--line);margin-top:auto}
.guia .crit li{margin:5px 0}

/* ---------- botón "De qué trata" ---------- */
.hubx{margin:22px 0 30px}
.hubbtn{position:relative;display:flex;align-items:center;gap:14px;width:100%;max-width:560px;padding:12px 22px 12px 14px;border:3px dashed var(--chalk);border-radius:999px;background:rgba(255,209,102,.14);color:var(--chalk);font:inherit;font-weight:800;font-size:clamp(17px,3.4vw,23px);cursor:pointer;text-align:left;overflow:hidden;transition:transform .2s,background .2s,border-style .2s;animation:aparecer .6s .15s backwards}
.hubbtn:hover{transform:translateY(-3px) rotate(-.6deg);background:rgba(255,209,102,.24)}
.hubbtn .q{flex:none;width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:var(--chalk);color:#2b2100;font-size:24px;font-weight:900;transition:transform .6s cubic-bezier(.2,.9,.3,1.3);animation:hxlat 2.6s ease-in-out infinite}
.hubbtn[aria-expanded="true"]{border-style:solid;background:rgba(255,209,102,.2)}
.hubbtn[aria-expanded="true"] .q{transform:rotate(360deg);animation:none}
.hubbtn .s{position:absolute;inset:0;background:linear-gradient(100deg,transparent 35%,rgba(255,255,255,.28) 50%,transparent 65%);transform:translateX(-120%);animation:hxsheen 4.5s 1.2s infinite;pointer-events:none}
.hx-wrap{display:grid;grid-template-rows:0fr;transition:grid-template-rows .55s cubic-bezier(.2,.8,.2,1)}
.hx-in{overflow:hidden;min-height:0}
.hubx.open .hx-wrap{grid-template-rows:1fr}
.hx-box{margin-top:14px;padding:clamp(16px,3vw,26px);background:var(--surface);color:var(--ink);border-radius:18px;box-shadow:var(--shadow);display:flex;gap:clamp(14px,3vw,28px);align-items:flex-start}
.hx-fig{flex:none;width:84px;height:84px;border-radius:24px 8px 24px 8px;background:var(--surface-2);display:grid;place-items:center;border:1px solid var(--line)}
.hx-fig svg{width:50px;height:50px;fill:none;stroke:var(--primary);stroke-width:1.7;stroke-linecap:round;stroke-linejoin:round}
.hubx.open .hx-fig svg{animation:hxpop .7s .15s cubic-bezier(.2,.9,.3,1.3) both}
.hx-tx{min-width:0}
.hx-tx p{margin:0 0 10px;font-size:17px;line-height:1.55;color:var(--ink-soft);max-width:62ch}
.hx-tx ul{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.hx-tx li{display:grid;gap:1px;padding:8px 12px;border-left:4px solid var(--chalk);background:var(--surface-2);border-radius:4px 10px 10px 4px;opacity:0}
.hx-tx li b{font-size:14px;color:var(--muted)}
.hx-tx li span{font-size:16px;line-height:1.4;color:var(--ink)}
.hubx.open .hx-tx li{animation:hxin .55s cubic-bezier(.2,.8,.2,1) both;animation-delay:calc(.3s + var(--i)*.2s)}
@keyframes hxin{from{opacity:0;transform:translateX(-18px)}to{opacity:1;transform:none}}
@keyframes hxpop{0%{opacity:0;transform:scale(.4) rotate(-20deg)}100%{opacity:1;transform:none}}
@keyframes hxlat{0%,100%{transform:scale(1)}50%{transform:scale(1.12)}}
@keyframes hxsheen{0%,60%{transform:translateX(-120%)}100%{transform:translateX(120%)}}
@media (max-width:560px){.hx-box{flex-direction:column}}
@media (prefers-reduced-motion:reduce){.hubbtn .q,.hubbtn .s{animation:none}.hx-wrap{transition:none}.hubx.open .hx-tx li{animation:none;opacity:1}}
@media print{.hubx{display:none}}
.guia .fcard.wide{grid-column:1/-1}