/* Portal académico · pizarra verde, lápiz amarillo y papel claro */
:root{
  color-scheme:light dark;
  --paper:#f2f5f3;--card:#fff;--ink:#12261f;--mut:#566860;--line:#d9e2dd;
  --board:#1f4a3d;--board-hi:#2a6552;--pencil:#f2b134;--pencil-soft:rgba(242,177,52,.4);--on-pencil:#1c1a10;
  --ok:#17784d;--ok-bg:#e1f3e9;--bad:#b3342e;--bad-bg:#fbe7e5;--ring:rgba(31,74,61,.4);
  --sh:0 1px 2px rgba(18,38,31,.06),0 6px 20px rgba(18,38,31,.06);
  --serif:ui-serif,"Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;
  --sans:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
}
@media (prefers-color-scheme:dark){:root{
  --paper:#0e1a16;--card:#15251f;--ink:#e7f0ea;--mut:#9bb0a5;--line:#24392f;
  --board:#1d4a3c;--board-hi:#28614f;--ok:#4cc38a;--ok-bg:rgba(76,195,138,.14);--bad:#ff8a80;--bad-bg:rgba(255,138,128,.14);
  --ring:rgba(242,177,52,.55);--sh:0 1px 2px rgba(0,0,0,.4);
}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;min-height:100vh;background:var(--paper);color:var(--ink);font:16px/1.5 var(--sans);-webkit-font-smoothing:antialiased}
main{max-width:640px;margin:0 auto;padding:max(18px,env(safe-area-inset-top)) max(16px,env(safe-area-inset-right)) max(48px,env(safe-area-inset-bottom)) max(16px,env(safe-area-inset-left))}
body[data-role=admin] main,body[data-role=teacher] main{max-width:1120px}
body[data-role=pw] main{max-width:440px;padding-top:8vh}

h1{font:600 1.55rem/1.2 var(--serif);letter-spacing:-.01em;margin:0 0 4px}
h2{font-size:1.02rem;font-weight:650;margin:0 0 10px}
.s{color:var(--mut);font-size:.92rem;margin:0 0 14px}
small{font-size:.85rem}

/* Encabezado: la pizarra */
.top{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px 16px;margin-bottom:16px;padding:18px 20px;border-radius:18px;border-left:7px solid var(--pencil);color:#fff;
  background:radial-gradient(120% 160% at 0% 0%,rgba(255,255,255,.09),transparent 55%),var(--board)}
.top h1{color:#fff}
.top .s{color:rgba(255,255,255,.74);margin:0}
.top>span{display:flex;gap:8px;flex-wrap:wrap}
.top button.g{color:#fff;border-color:rgba(255,255,255,.38);min-height:38px;padding:6px 14px;font-size:.88rem}
.top button.g:hover{background:rgba(255,255,255,.14)}

.card{background:var(--card);border:1px solid var(--line);border-radius:16px;padding:18px;margin-bottom:16px;box-shadow:var(--sh)}

/* Formularios */
input,select{display:block;width:100%;min-height:46px;padding:10px 13px;border:1px solid var(--line);border-radius:12px;background:var(--paper);color:var(--ink);font:inherit;font-size:16px;margin-bottom:10px;transition:border-color .15s,box-shadow .15s}
input::placeholder{color:var(--mut);opacity:.85}
input:focus-visible,select:focus-visible{outline:0;border-color:var(--board-hi);box-shadow:0 0 0 3px var(--ring)}
input[type=search]{-webkit-appearance:none;appearance:none}

button{min-height:44px;padding:10px 18px;border:0;border-radius:12px;background:var(--pencil);color:var(--on-pencil);font:inherit;font-weight:650;cursor:pointer;box-shadow:inset 0 -2px 0 rgba(0,0,0,.14);transition:filter .15s,background .15s,transform .05s}
button:hover{filter:brightness(.96)}
button:active{transform:translateY(1px)}
button:focus-visible{outline:0;box-shadow:0 0 0 3px var(--ring)}
button.g{background:transparent;color:var(--ink);border:1px solid var(--line);box-shadow:none;font-weight:550;min-height:40px;padding:7px 14px}
button.g:hover{background:var(--paper);filter:none}
button.x{background:transparent;color:var(--mut);border:0;box-shadow:none;min-height:40px;min-width:40px;padding:6px 10px}
button.x:hover{color:var(--bad);background:var(--bad-bg);filter:none}
.card>button:not(.g):not(.x){width:100%}
.card>button.g{margin-top:8px}

/* Pestañas */
nav{display:flex;gap:4px;margin-bottom:16px;padding:5px;background:var(--card);border:1px solid var(--line);border-radius:14px;overflow-x:auto;scrollbar-width:none;position:sticky;top:max(8px,env(safe-area-inset-top));z-index:5;box-shadow:var(--sh)}
nav::-webkit-scrollbar{display:none}
nav button{flex:1 0 auto;white-space:nowrap;background:transparent;color:var(--mut);box-shadow:none;min-height:40px;padding:8px 14px;font-weight:550}
nav button:hover{background:var(--paper);filter:none}
nav button.on{background:var(--board);color:#fff}

/* Listas */
.row{display:flex;justify-content:space-between;align-items:center;gap:8px 14px;padding:12px 0;border-bottom:1px solid var(--line)}
.row:last-child{border-bottom:0;padding-bottom:2px}
.row>div{min-width:0;overflow-wrap:anywhere}
.row small{color:var(--mut);display:block;margin-top:1px}
.row>span{display:flex;align-items:center;justify-content:flex-end;flex-wrap:wrap;gap:6px}
.row>span:has(button){flex:0 1 auto}
.n{font-weight:700;font-variant-numeric:tabular-nums;min-width:4.2em;text-align:center;padding:5px 12px;border-radius:999px;background:var(--paper);color:var(--mut)}
.n.ok{background:var(--ok-bg);color:var(--ok)}
.n.bad{background:var(--bad-bg);color:var(--bad)}
span.ok{color:var(--ok);font-weight:600}
.bad{color:var(--bad)}
.nt{width:92px;min-height:46px;margin:0;text-align:center;font-weight:700;font-size:1.05rem;font-variant-numeric:tabular-nums}
.nt:disabled{opacity:.55}

/* Promedio: número con subrayador */
.avg{display:inline-block;font:600 3.2rem/1 var(--serif);letter-spacing:-.02em;padding:0 .08em;background:linear-gradient(transparent 62%,var(--pencil-soft) 62%)}
.notice{border-left:5px solid var(--bad)}
.notice strong{color:var(--bad)}

/* Acceso: pizarra a pantalla completa */
body[data-role=login]{background:var(--board)}
.login{max-width:400px;min-height:calc(100vh - 66px);margin:0 auto;display:flex;flex-direction:column;justify-content:center;text-align:center}
.login h1{color:#fff;font-size:1.9rem;margin-top:6px}
.login>.s{color:rgba(255,255,255,.76)}
.login .card{text-align:left;padding:22px;box-shadow:0 18px 40px rgba(0,0,0,.28);border:0}
.logo{width:84px;height:84px;object-fit:contain;margin:0 auto 10px}
.login>.s:last-child{margin-top:4px}

/* Grupos de campos */
.filt,.fgrid{display:grid;gap:0}
.hint{margin:-4px 0 10px;font-size:.82rem}
.card>small{display:block;margin-bottom:8px}

/* Compactar filas en pantallas pequeñas: los botones pasan debajo del texto */
@media (max-width:600px){
  h1{font-size:1.4rem}
  .top{padding:16px}
  .row:has(button){flex-wrap:wrap;position:relative}
  .row:has(button)>div{padding-right:36px}
  .row>span:has(button){width:100%;justify-content:flex-start}
  .row>span:has(button) button{flex:0 0 auto}
  .row>span:has(button) button.g{padding:6px 11px;font-size:.86rem;min-height:38px}
  .row>span:has(button) .x{position:absolute;top:6px;right:-6px}
}
@media (min-width:600px){
  .filt{grid-template-columns:1.6fr 1fr 1fr;gap:0 10px}
  .fgrid{grid-template-columns:1fr 1fr;gap:0 12px}
  .fgrid .hint{grid-column:1/-1}
}

/* Pantallas medianas y grandes */
@media (min-width:900px){
  main{padding-top:28px}
  .top{padding:22px 26px;margin-bottom:22px}
  h1{font-size:1.8rem}
  /* Administración: menú lateral + contenido */
  .row>span:has(button){flex-wrap:nowrap}
  .shell{display:grid;grid-template-columns:210px minmax(0,1fr);gap:28px;align-items:start}
  .shell nav{flex-direction:column;position:sticky;top:20px;margin:0;padding:8px;overflow:visible}
  .shell nav button{text-align:left;border-left:3px solid transparent;border-radius:9px;flex:0 0 auto}
  .shell nav button.on{border-left-color:var(--pencil)}
  .pane{min-width:0}
  /* Profesor: una tarjeta por materia, en columnas */
  body[data-role=teacher] #app{display:grid;grid-template-columns:repeat(auto-fill,minmax(340px,1fr));gap:16px;align-items:start}
  body[data-role=teacher] #app>.top,body[data-role=teacher] #app>select,body[data-role=teacher] #app>.notice{grid-column:1/-1;margin-bottom:0}
  body[data-role=teacher] #app>.card{margin-bottom:0}
  .row:hover{background:linear-gradient(90deg,transparent,var(--paper) 12%,var(--paper) 88%,transparent)}
}

@media (prefers-reduced-motion:reduce){*{transition:none!important}}

@media print{
  body{background:#fff;color:#000}
  .top{background:none;color:#000;border:0;border-bottom:2px solid #000;border-radius:0;padding:0 0 8px}
  .top h1,.top .s{color:#000}
  .top>span,nav,select,button{display:none!important}
  .card{box-shadow:none;border:1px solid #999;break-inside:avoid}
}