:root{
  --brown:#4A2E1B;--brown2:#7A4B2A;--cream:#FFF8F0;--cream2:#F6EFE4;--ochre:#C58B3F;--ink:#2B1B14;--muted:#7b6a5d;
  --line:#E7D8C6;--ok:#2E7D4F;--okbg:#E6F3EA;--bad:#B3261E;--badbg:#FBE9E7;--warn:#9A6A12;--warnbg:#FFF3D6;
  --code:#2B1B14;--codefg:#F6EFE4;--radius:14px;--shadow:0 2px 10px rgba(74,46,27,.08);
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--cream);color:var(--ink);font:16px/1.55 system-ui,-apple-system,"Segoe UI",Roboto,sans-serif}
h1,h2,h3{font-family:Georgia,"Times New Roman",serif;color:var(--brown);line-height:1.2;margin:0 0 .5em}
h1{font-size:2rem}h2{font-size:1.45rem}h3{font-size:1.15rem}
a{color:var(--brown2)}
button,input,select,textarea{font:inherit;color:inherit}
code,pre,.mono{font-family:ui-monospace,"Cascadia Code",Consolas,Menlo,monospace}
code{background:var(--cream2);border:1px solid var(--line);border-radius:5px;padding:0 .3em;font-size:.9em;white-space:pre-wrap}
[hidden]{display:none!important}

.top{background:var(--brown);color:var(--cream);display:flex;align-items:center;gap:16px;padding:10px 20px;flex-wrap:wrap}
.top .brand{font-family:Georgia,serif;font-size:1.15rem;font-weight:700;color:var(--cream);text-decoration:none;display:flex;align-items:center;gap:10px}
.top .brand i{font-style:normal;background:var(--ochre);color:var(--brown);border-radius:50%;width:30px;height:30px;display:inline-grid;place-items:center;font-size:1rem}
.top nav{display:flex;gap:4px;margin-left:auto;flex-wrap:wrap}
.top nav a,.top nav button{color:var(--cream);text-decoration:none;padding:6px 12px;border-radius:8px;background:none;border:0;cursor:pointer;opacity:.85}
.top nav a:hover,.top nav button:hover,.top nav a.on{background:rgba(255,255,255,.14);opacity:1}
.wrap{max-width:1040px;margin:0 auto;padding:24px 18px 60px}
.wide{max-width:1280px}

.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px}
.card+.card{margin-top:16px}
.grid{display:grid;gap:16px}
.grid.two{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.row{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.spread{justify-content:space-between}
.muted{color:var(--muted)}.small{font-size:.88rem}.center{text-align:center}
.hero{padding:30px 0 10px}
.hero p{font-size:1.1rem;max-width:62ch}
.bigcard{display:block;text-decoration:none;color:inherit;cursor:pointer;transition:transform .12s,box-shadow .12s;border:2px solid transparent;text-align:left;width:100%;background:#fff}
.bigcard:hover{transform:translateY(-2px);box-shadow:0 6px 18px rgba(74,46,27,.15);border-color:var(--ochre)}
.bigcard .ico{font-size:2.2rem}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;background:var(--brown);color:var(--cream);border:0;border-radius:10px;padding:10px 18px;cursor:pointer;font-weight:600;text-decoration:none}
.btn:hover{background:var(--brown2)}
.btn:disabled{opacity:.45;cursor:not-allowed}
.btn.alt{background:#fff;color:var(--brown);border:1.5px solid var(--brown)}
.btn.alt:hover{background:var(--cream2)}
.btn.ochre{background:var(--ochre);color:var(--ink)}
.btn.danger{background:var(--bad)}
.btn.sm{padding:5px 11px;font-size:.88rem;border-radius:8px}
.btn.ghost{background:none;color:var(--brown);border:0;padding:5px 8px}
.btn.ghost:hover{background:var(--cream2)}

.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{border:1.5px solid var(--line);background:#fff;border-radius:999px;padding:6px 14px;cursor:pointer;user-select:none}
.chip.on{background:var(--brown);color:var(--cream);border-color:var(--brown)}
.chip small{opacity:.7;margin-left:4px}
.badge{display:inline-block;border-radius:999px;padding:1px 10px;font-size:.78rem;font-weight:600;background:var(--cream2);color:var(--brown);border:1px solid var(--line);white-space:nowrap}
.badge.ok{background:var(--okbg);color:var(--ok);border-color:#bfe0cb}
.badge.bad{background:var(--badbg);color:var(--bad);border-color:#f2c2bd}
.badge.warn{background:var(--warnbg);color:var(--warn);border-color:#ecd49a}
.badge.dark{background:var(--brown);color:var(--cream);border-color:var(--brown)}

label.field{display:block;margin-bottom:12px}
label.field>span{display:block;font-size:.88rem;font-weight:600;color:var(--brown);margin-bottom:4px}
input[type=text],input[type=password],input[type=number],select,textarea.input{width:100%;padding:10px 12px;border:1.5px solid var(--line);border-radius:10px;background:#fff}
input:focus,select:focus,textarea:focus{outline:2px solid var(--ochre);outline-offset:1px}
.code-input{font-family:ui-monospace,Consolas,monospace;font-size:1.4rem;letter-spacing:.25em;text-transform:uppercase;text-align:center}

.bar{height:8px;background:var(--cream2);border-radius:99px;overflow:hidden}
.bar>i{display:block;height:100%;background:var(--ochre);border-radius:99px;transition:width .3s}
.bar.ok>i{background:var(--ok)}

/* questions */
.q-head{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:10px}
.q-text{font-size:1.12rem;font-weight:600;margin:0 0 14px;white-space:pre-wrap}
.opts{display:grid;gap:8px}
.opt{display:flex;gap:10px;align-items:flex-start;border:1.5px solid var(--line);border-radius:12px;padding:10px 14px;cursor:pointer;background:#fff;transition:background .1s,border-color .1s}
.opt:hover{border-color:var(--ochre)}
.opt.sel{background:var(--cream2);border-color:var(--brown)}
.opt input{margin-top:.3em;accent-color:var(--brown)}
.opt.ok{background:var(--okbg);border-color:var(--ok)}
.opt.bad{background:var(--badbg);border-color:var(--bad)}
.opt.miss{border-style:dashed;border-color:var(--ok)}
.vf{display:flex;gap:12px}.vf .opt{flex:1;justify-content:center;font-weight:700;font-size:1.1rem}
.snippet{margin:0 0 14px}
pre.codeblock,.codeview{background:var(--code);color:var(--codefg);border-radius:12px;padding:12px 14px;overflow:auto;font-size:.9rem;line-height:1.55;margin:0;white-space:pre}
.tk-tag{color:#F2A65A}.tk-attr{color:#9AD1A4}.tk-str{color:#F7D794}.tk-cm{color:#8f8173;font-style:italic}.tk-sel{color:#F2A65A}.tk-prop{color:#9AD1A4}.tk-num{color:#8ec5f0}.tk-at{color:#d99ae0}
.audit{background:var(--code);border-radius:12px;padding:6px 0;overflow:auto}
.audit .ln{display:flex;width:100%;text-align:left;background:none;border:0;border-left:4px solid transparent;color:var(--codefg);font:inherit;font-size:.9rem;line-height:1.7;padding:0 12px 0 0;cursor:pointer;white-space:pre}
.audit .ln:hover{background:rgba(255,255,255,.07)}
.audit .ln .n{display:inline-block;min-width:3em;text-align:right;padding-right:1em;color:#8f8173;user-select:none}
.audit .ln.sel{background:rgba(197,139,63,.3);border-left-color:var(--ochre)}
.audit.ro .ln{cursor:default}
.audit .ln.hit{background:rgba(46,125,79,.35);border-left-color:#4cc27f}
.audit .ln.miss{background:rgba(197,139,63,.35);border-left-color:var(--ochre)}
.audit .ln.false{background:rgba(179,38,30,.4);border-left-color:#ff6b61}
.assoc{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.3fr);gap:10px 14px;align-items:center}
.assoc .l{font-weight:600;background:var(--cream2);border-radius:10px;padding:9px 12px;border:1px solid var(--line)}
.assoc .l code{background:none;border:0}
.assoc select{width:100%}
.assoc .good{border-color:var(--ok);background:var(--okbg)}.assoc .wrong{border-color:var(--bad);background:var(--badbg)}
.editor{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:14px}
@media(max-width:900px){.editor{grid-template-columns:1fr}.assoc{grid-template-columns:1fr}}
.edwrap{position:relative;display:flex;background:var(--code);border-radius:12px;overflow:hidden;min-height:340px;max-height:520px}
.edwrap .gut{background:#201410;color:#8f8173;text-align:right;padding:12px 8px 12px 12px;font:.9rem/1.55 ui-monospace,Consolas,monospace;user-select:none;overflow:hidden;white-space:pre;min-width:3.2em}
.edwrap textarea{flex:1;resize:none;border:0;background:transparent;color:var(--codefg);font:.9rem/1.55 ui-monospace,Consolas,monospace;padding:12px;white-space:pre;overflow:auto;outline:none;tab-size:2}
.preview{border:1.5px solid var(--line);border-radius:12px;background:#fff;overflow:hidden;display:flex;flex-direction:column;min-height:340px}
.preview .pt{background:var(--cream2);padding:5px 12px;font-size:.8rem;color:var(--muted);border-bottom:1px solid var(--line)}
.preview iframe{border:0;flex:1;width:100%;min-height:300px;background:#fff}
.checks{list-style:none;padding:0;margin:12px 0 0;display:grid;gap:6px}
.checks li{display:flex;gap:8px;align-items:flex-start;padding:7px 10px;border-radius:10px;background:var(--cream2);font-size:.93rem}
.checks li.ok{background:var(--okbg)}.checks li.bad{background:var(--badbg)}
.checks li b{flex:none;width:1.3em}
.explain{margin-top:14px;padding:12px 14px;border-left:4px solid var(--ochre);background:var(--warnbg);border-radius:0 10px 10px 0}
.verdict{display:flex;align-items:center;gap:10px;font-weight:700;padding:10px 14px;border-radius:12px;margin-bottom:14px}
.verdict.ok{background:var(--okbg);color:var(--ok)}.verdict.bad{background:var(--badbg);color:var(--bad)}.verdict.mid{background:var(--warnbg);color:var(--warn)}
details.sol{margin-top:12px}details.sol summary{cursor:pointer;font-weight:600;color:var(--brown)}

/* examen */
.exam-top{position:sticky;top:0;z-index:20;background:var(--brown);color:var(--cream);display:flex;gap:14px;align-items:center;padding:8px 18px;flex-wrap:wrap}
.exam-top .timer{font:700 1.4rem ui-monospace,Consolas,monospace;background:rgba(255,255,255,.12);padding:2px 12px;border-radius:10px}
.exam-top .timer.low{background:var(--bad);animation:pulse 1s infinite}
@keyframes pulse{50%{opacity:.6}}
.exam-layout{display:grid;grid-template-columns:200px minmax(0,1fr);gap:18px;max-width:1280px;margin:18px auto;padding:0 18px 60px}
@media(max-width:860px){.exam-layout{grid-template-columns:1fr}}
.nav-q{position:sticky;top:64px;align-self:start}
.nav-q .nums{display:grid;grid-template-columns:repeat(auto-fill,minmax(40px,1fr));gap:6px}
.nav-q button{height:40px;border:1.5px solid var(--line);background:#fff;border-radius:10px;cursor:pointer;font-weight:700;position:relative}
.nav-q button.done{background:var(--cream2);border-color:var(--brown2)}
.nav-q button.cur{background:var(--brown);color:var(--cream);border-color:var(--brown)}
.nav-q button.flag::after{content:"⚑";position:absolute;top:-6px;right:-3px;color:var(--bad);font-size:.9rem}
.noselect{user-select:none;-webkit-user-select:none}
.noselect textarea,.noselect input{user-select:text;-webkit-user-select:text}
.overlay{position:fixed;inset:0;background:rgba(43,27,20,.88);display:grid;place-items:center;z-index:50;padding:20px}
.overlay .card{max-width:520px}
.modal-bg{position:fixed;inset:0;background:rgba(43,27,20,.55);display:grid;place-items:center;z-index:40;padding:16px;overflow:auto}
.modal{background:#fff;border-radius:var(--radius);max-width:820px;width:100%;max-height:92vh;overflow:auto;padding:22px;box-shadow:0 10px 40px rgba(0,0,0,.3)}
.toast{position:fixed;bottom:18px;left:50%;transform:translateX(-50%);background:var(--brown);color:var(--cream);padding:10px 18px;border-radius:12px;z-index:60;box-shadow:var(--shadow)}
.toast.err{background:var(--bad)}

table.tbl{width:100%;border-collapse:collapse;background:#fff;border-radius:12px;overflow:hidden}
table.tbl th{background:var(--cream2);text-align:left;font-size:.82rem;text-transform:uppercase;letter-spacing:.04em;color:var(--brown)}
table.tbl th,table.tbl td{padding:9px 12px;border-bottom:1px solid var(--line);vertical-align:middle}
table.tbl tr:last-child td{border-bottom:0}
table.tbl tr:hover td{background:#fffcf8}
.note{font:700 1.1rem Georgia,serif}
.codebox{font:700 1.7rem ui-monospace,Consolas,monospace;letter-spacing:.2em;background:var(--cream2);border:2px dashed var(--ochre);border-radius:12px;padding:4px 16px;display:inline-block}
.stat{background:var(--cream2);border-radius:12px;padding:10px 16px;min-width:110px}
.stat b{display:block;font:700 1.5rem Georgia,serif;color:var(--brown)}
.stat span{font-size:.8rem;color:var(--muted);text-transform:uppercase;letter-spacing:.04em}
.tl{font-size:.85rem;color:var(--muted)}
.big-score{font:700 3.2rem Georgia,serif;color:var(--brown)}
.sec-row{display:grid;grid-template-columns:2fr 90px 1.2fr auto;gap:8px;align-items:center;margin-bottom:8px}
@media(max-width:700px){.sec-row{grid-template-columns:1fr 80px}}
@media print{.top,.exam-top,.btn,.nav-q{display:none!important}}