:root{--bg:#e8eff3;--panel:#f7fafb;--ink:#0d2a3a;--mute:#5b7384;--line:#cbd9e1;--dual:#2a6fb0;--solo:#c2306e;--pax:#e0a02c;--ok:#1d8a6b;--prp:#7a5cc2;--gry:#8a9aa6;--bad:#b3261e}
@media(prefers-color-scheme:dark){:root{--bg:#0b1a24;--panel:#122836;--ink:#e6f0f5;--mute:#8fa8b8;--line:#223a4a;--dual:#5aa4e6;--solo:#f05a97;--pax:#f2bd55;--ok:#46c9a1;--prp:#a58be0;--gry:#7d8f9b;--bad:#ff8a80}}
*{box-sizing:border-box}
body{margin:0;background:var(--bg);color:var(--ink);font:400 15px/1.5 "IBM Plex Sans",system-ui,sans-serif;padding:env(safe-area-inset-top) env(safe-area-inset-right) env(safe-area-inset-bottom) env(safe-area-inset-left)}
h1,h2,h3,.big{font-family:"Bricolage Grotesque",system-ui,sans-serif;letter-spacing:-.02em;line-height:1.1;margin:0}
h1{font-size:clamp(24px,5vw,36px);font-weight:700}
h2{font-size:17px;font-weight:700}
h3{font-size:20px;font-weight:700}
p{margin:0}
.wrap{max-width:1180px;margin:0 auto;padding:20px 16px}
.muted{color:var(--mute)}
.stack>*+*{margin-top:14px}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:14px}
.c7{grid-column:span 7}.c5{grid-column:span 5}

/* Cabecera */
.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:18px}
.brand{font:700 20px "Bricolage Grotesque",system-ui,sans-serif;letter-spacing:-.02em}
.user{display:flex;align-items:center;gap:10px;min-width:0}
.uname{font-weight:500;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:200px}
.avatar{width:34px;height:34px;border-radius:50%;background:var(--ink);color:var(--bg);display:grid;place-items:center;font-weight:600;flex:none}

/* Tarjetas y botones */
.card{background:var(--panel);border:1px solid var(--line);border-radius:14px;padding:16px;min-width:0}
.btn{border:0;background:var(--ink);color:var(--bg);padding:10px 16px;border-radius:9px;font:600 15px "IBM Plex Sans",system-ui,sans-serif;cursor:pointer;min-height:44px;text-decoration:none;display:inline-flex;align-items:center;justify-content:center}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn.ghost{background:transparent;color:inherit;border:1px solid var(--line)}
.btn.small{padding:5px 10px;font-size:12.5px;min-height:34px}
.btn.block{width:100%}

/* Hero */
.hero{background:#0f2747;color:#fff;border-radius:18px;padding:22px;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:20px;align-items:center}
.hero .btn{background:#f2a86b;color:#0f2747}
.hero .btn:hover{background:#f7bb88}
.hero .btn.ghost{background:transparent;color:#fff;border:1px solid #4a6285}
.eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:.08em;font-weight:600;color:#f2a86b;margin-bottom:8px}
.hero p{color:#b9c6da;margin:10px 0 16px}
.kpis{display:grid;gap:10px}
.kpi{border-left:2px solid rgba(255,255,255,.25);padding-left:12px}
.kpi b{display:block;font:700 20px "Bricolage Grotesque",system-ui,sans-serif}
.kpi span{font-size:12.5px;opacity:.7}

/* Formularios */
.tabs{display:flex;border:1px solid var(--line);border-radius:10px;padding:3px;gap:3px;margin-bottom:14px}
.tabs button{flex:1;border:0;background:transparent;color:var(--ink);font:600 14px "IBM Plex Sans",system-ui,sans-serif;padding:8px 10px;border-radius:7px;cursor:pointer;min-height:36px}
.tabs button[aria-selected="true"]{background:var(--ink);color:var(--bg)}
.field{margin-bottom:12px}
label{display:block;font-size:13px;color:var(--mute);margin-bottom:4px}
input{width:100%;padding:9px 10px;border:1px solid var(--line);background:var(--bg);color:var(--ink);border-radius:8px;font:400 16px "IBM Plex Sans",system-ui,sans-serif}
.hint{font-size:12.5px;color:var(--mute);margin-top:4px}
.msg{border:1px solid var(--line);border-radius:9px;padding:9px 12px;font-size:13.5px;margin-bottom:14px}
.msg.err{border-color:var(--bad);color:var(--bad)}
.msg.ok{border-color:var(--ok);color:var(--ok)}
.msg.warn{border-color:var(--pax);color:var(--ink)}
.msg.inline{margin:12px 0 0}
[hidden]{display:none!important}

/* Planes y exámenes */
.plans{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.exams{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr));gap:14px}
.item{display:flex;flex-direction:column;gap:8px}
.item .grow{flex:1}
.price{font:700 22px "Bricolage Grotesque",system-ui,sans-serif;letter-spacing:-.02em}
.tag{display:inline-block;border-radius:99px;padding:2px 10px;font-size:12px;font-weight:500;color:#fff;background:var(--gry);width:fit-content}
.tag.ok{background:#14532d}.tag.warn{background:#7a4a00}.tag.bad{background:#9b1c1c}
.empty{text-align:center;padding:28px 16px}
.empty .btn{margin-top:12px}

/* Preguntas */
.bar{height:10px;background:var(--line);border-radius:6px;overflow:hidden}
.bar>i{display:block;height:100%;background:var(--dual);border-radius:6px}
.qmeta{font-size:12.5px;color:var(--mute);margin:10px 0 8px}
.qtext{font-size:19px;line-height:1.3;white-space:pre-line;margin-bottom:14px}
.opts{display:grid;gap:8px}
.opt{display:flex;gap:10px;align-items:flex-start;width:100%;text-align:left;border:1px solid var(--line);background:var(--panel);color:var(--ink);border-radius:10px;padding:12px;font:400 15px/1.4 "IBM Plex Sans",system-ui,sans-serif;cursor:pointer;min-height:44px}
.opt:hover:not(:disabled){border-color:var(--dual)}
.opt:disabled{cursor:default}
.opt .lt{flex:none;width:26px;height:26px;border-radius:50%;border:1px solid var(--line);display:grid;place-items:center;font-weight:600;font-size:13px}
.opt[aria-pressed="true"]{border-color:var(--dual)}
.opt[aria-pressed="true"] .lt{background:var(--dual);border-color:var(--dual);color:var(--bg)}
.opt.correct{border-color:var(--ok);background:color-mix(in srgb,var(--ok) 12%,var(--panel))}
.opt.wrong{border-color:var(--bad);background:color-mix(in srgb,var(--bad) 10%,var(--panel))}
.explain{border-left:2px solid var(--ok);padding:2px 0 2px 12px;margin-top:14px}
.explain b{display:block;margin-bottom:2px}
.explain p{white-space:pre-line}
.nav{margin-top:14px;justify-content:space-between}
.nav .mid{display:flex;gap:10px;flex-wrap:wrap}
.seg{display:flex;flex-wrap:wrap;border:1px solid var(--line);border-radius:10px;padding:3px;gap:3px;width:fit-content;max-width:100%}
.seg button{border:0;background:transparent;color:var(--ink);font:600 14px "IBM Plex Sans",system-ui,sans-serif;padding:8px 14px;border-radius:7px;cursor:pointer;min-height:36px}
.seg button[aria-pressed="true"]{background:var(--ink);color:var(--bg)}

/* Resultado */
.score{background:#0f2747;color:#fff;border-radius:18px;padding:22px;display:flex;gap:24px;align-items:center;flex-wrap:wrap}
.score .big{font-size:clamp(54px,12vw,104px);font-variant-numeric:tabular-nums}
.score span{color:#b9c6da}
.review{display:grid;gap:14px}
.review .answer{font-size:14px;margin-top:6px}
.review .answer b{font-weight:600}

a:focus-visible,.btn:focus-visible,input:focus-visible,button:focus-visible{outline:2px solid var(--dual);outline-offset:2px}
@media(max-width:820px){.hero{grid-template-columns:minmax(0,1fr)}.c7,.c5{grid-column:span 12}.plans{grid-template-columns:minmax(0,1fr)}}
@media(max-width:480px){.uname{display:none}.nav .btn{flex:1}}

/* Selector de asignaturas */
.subjects{display:flex;flex-wrap:wrap;gap:8px}
.chip{border:1px solid var(--line);background:transparent;color:var(--ink);font:600 14px "IBM Plex Sans",system-ui,sans-serif;padding:8px 14px;border-radius:999px;cursor:pointer;min-height:40px}
.chip[aria-pressed="true"]{background:var(--ink);color:var(--bg);border-color:var(--ink)}
.num{width:96px;min-height:44px;padding:0 12px;border:1px solid var(--line);border-radius:10px;background:transparent;color:var(--ink);font:600 16px "IBM Plex Sans",system-ui,sans-serif}

/* Reporte de errores */
.report{margin-top:12px;display:grid;gap:8px}
.report textarea{width:100%;padding:8px 10px;border:1px solid var(--line);border-radius:10px;background:transparent;color:var(--ink);font:400 14px "IBM Plex Sans",system-ui,sans-serif;resize:vertical}
.report-link{border:0;background:none;padding:0;color:var(--mute);font:400 12px "IBM Plex Sans",system-ui,sans-serif;text-decoration:underline;cursor:pointer;justify-self:start}
.report-link:hover{color:var(--ink)}
.report-ok{font-size:12px;color:var(--mute)}
.report-err{font-size:13px;color:#b3261e}

/* Móvil */
.brand,.topbar .btn{white-space:nowrap}
@media(max-width:480px){
  .wrap{padding:14px 14px}
  .topbar{gap:8px;margin-bottom:14px;flex-wrap:wrap}
  .brand{font-size:17px}
  .user{gap:6px}
  .avatar{width:30px;height:30px}
  .topbar .btn.small{padding:4px 9px;min-height:32px}
  .qtext{font-size:18px}
  .seg button{padding:8px 11px}
}

/* Acceso */
.row-between{display:flex;justify-content:space-between;align-items:center;gap:10px;flex-wrap:wrap}
.chk-label{display:flex;align-items:center;gap:8px;margin:0;color:var(--ink);font-size:14px;cursor:pointer}
input.chk{width:18px;height:18px;padding:0;accent-color:var(--ink)}
.link{border:0;background:none;padding:6px 0;color:var(--dual);font:500 14px "IBM Plex Sans",system-ui,sans-serif;cursor:pointer;text-decoration:underline;min-height:32px}

/* Inicio de visitante */
.landing{grid-template-columns:minmax(0,1.2fr) minmax(0,1fr);gap:32px;padding:32px}
.landing .pitch p{margin:12px 0 22px}
.authcard{color:var(--ink);padding:20px}
.authcard form .btn{background:var(--ink);color:var(--bg)}
.authcard form .btn:hover{background:var(--ink)}
@media(max-width:820px){.landing{grid-template-columns:minmax(0,1fr);padding:20px;gap:22px}.landing .kpis{display:none}.landing .pitch p{margin:10px 0 0}}
.explain.bad{border-left-color:var(--bad)}
.userlink{display:flex;align-items:center;gap:10px;min-width:0;background:transparent;border:0;padding:3px 8px 3px 3px;border-radius:99px;cursor:pointer;color:inherit;font:inherit}
.userlink:hover,.userlink.on{background:var(--line)}
.userlink{flex:none}.avatar{width:34px;height:34px}

.avatar.online{box-shadow:0 0 0 3px var(--panel),0 0 0 6px #22c55e}
.urow{display:flex;gap:14px;align-items:flex-start}
.uinfo{flex:1;min-width:0;display:flex;flex-direction:column;gap:1px;overflow-wrap:anywhere}
.ustats{text-align:right;display:flex;flex-direction:column;flex:none}
.ustats b{font:700 22px "Bricolage Grotesque",system-ui,sans-serif}
.ustats .muted{font-size:12.5px}
.topbar{justify-content:flex-end}

/* ===== Tema PilotPrep ===== */
:root{--bg:#F5F6FA;--panel:#FFFFFF;--ink:#0B1220;--mute:#475569;--line:#CBD5E1;--field:#94A3B8;--well:#EAEDF4;--dual:#4338CA;--accent:#4338CA;--on-accent:#FFFFFF;--soft:#E0E7FF;--tagfg:#312E81;--ok:#047857;--bad:#B91C1C;--okbg:#D1FAE5;--okfg:#064E3B;--badbg:#FEF2F2;--shadow:0 1px 2px rgba(11,18,32,.06),0 8px 24px rgba(11,18,32,.06)}
@media(prefers-color-scheme:dark){:root{--bg:#0B1220;--panel:#141D30;--ink:#E8ECF4;--mute:#A7B3C6;--line:#2C3A55;--field:#5B6B88;--well:#1B2740;--dual:#A5B4FC;--accent:#4F46E5;--soft:#27306B;--tagfg:#C7D2FE;--ok:#34D399;--bad:#F87171;--okbg:#064E3B;--okfg:#A7F3D0;--badbg:#3A1A22;--shadow:0 1px 2px rgba(0,0,0,.4)}}
body{font-family:"Plus Jakarta Sans",system-ui,sans-serif}
h1,h2,h3,.big,.brand,.price,.kpi b,.ustats b{font-family:"Plus Jakarta Sans",system-ui,sans-serif;letter-spacing:-.025em}
h1{font-weight:800}h2,h3{font-weight:700}
.btn,.tabs button,.seg button,.chip,.num,.link,.opt,input,.report textarea,.report-link{font-family:"Plus Jakarta Sans",system-ui,sans-serif}
.card{border:0;border-radius:20px;padding:20px;box-shadow:var(--shadow)}
.btn{background:var(--accent);color:var(--on-accent);border-radius:12px;min-height:48px;font-weight:700}
.btn:hover:not(:disabled){filter:brightness(1.08)}
.btn.ghost{background:var(--panel);color:var(--ink);border:1.5px solid var(--field)}
.btn.small{min-height:40px;border-radius:10px}
.tabs,.seg{background:var(--well);border:0;border-radius:12px;padding:4px}
.tabs button,.seg button{border-radius:9px;min-height:40px;color:var(--ink);font-weight:700}
.tabs button[aria-selected="true"],.seg button[aria-pressed="true"]{background:var(--accent);color:var(--on-accent)}
.chip{border:1.5px solid var(--field);background:var(--panel);font-weight:700}
.chip[aria-pressed="true"]{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}
.num{border:1.5px solid var(--field);background:var(--panel);border-radius:12px}
input{border:1.5px solid var(--field);background:var(--panel);border-radius:10px;min-height:48px}
input.chk{min-height:0;accent-color:var(--accent)}
label{color:var(--mute);font-weight:600}
.tag{background:var(--soft);color:var(--tagfg);font-weight:700}
.tag.ok{background:var(--okbg);color:var(--okfg)}
.tag.warn{background:#FEF3C7;color:#78350F}
.tag.bad{background:var(--badbg);color:var(--bad)}
.avatar{background:var(--ink);color:var(--bg)}
.userlink:hover,.userlink.on{background:var(--well)}
.link,.report-link:hover{color:var(--dual)}
.muted,.qmeta,.hint{color:var(--mute)}
.bar{height:10px;background:var(--well);border-radius:999px}.bar>i{background:var(--accent);border-radius:999px}
.qtext{font-size:24px;line-height:1.3;letter-spacing:-.015em;font-weight:700}
.opt{border:1.5px solid var(--line);border-radius:14px;padding:14px 16px;min-height:56px;font-size:16px;background:var(--panel)}
.opt:hover:not(:disabled){border-color:var(--accent)}
.opt .lt{width:30px;height:30px;border:1.5px solid var(--field);color:var(--mute)}
.opt[aria-pressed="true"]{border:2px solid var(--accent);background:var(--soft)}
.opt[aria-pressed="true"] .lt{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
.opt.correct{border:2px solid var(--ok);background:var(--okbg);color:var(--okfg)}
.opt.wrong{border:2px solid var(--bad);background:var(--badbg)}
.opt.correct .lt{background:var(--ok);border-color:var(--ok);color:#fff}
.opt.wrong .lt{background:var(--bad);border-color:var(--bad);color:#fff}
.explain{border-left:3px solid var(--ok);background:var(--okbg);color:var(--okfg);border-radius:0 12px 12px 0;padding:12px 14px}
.explain.bad{border-left-color:var(--bad);background:var(--badbg);color:var(--ink)}
.msg{border-radius:12px;border-width:1.5px}
.hero{background:#0B1220;border-radius:28px}
.hero .btn{background:var(--accent);color:#fff}
.eyebrow{color:#A5B4FC}
.score{background:#0B1220;border-radius:24px}
.brand{display:flex;align-items:center;gap:10px;background:none;border:0;padding:0;cursor:pointer;color:var(--ink);font-weight:800;font-size:19px;letter-spacing:-.02em}
.brand img{width:36px;height:36px;border-radius:10px;display:block}
.topbar{justify-content:space-between}
.landing{background:#1B3640;padding:40px;gap:40px;align-items:center}
.landing .logo{display:block;width:100%;max-width:520px;height:auto;margin:0 0 8px -24px;-webkit-mask-image:linear-gradient(to right,transparent,#000 12%,#000 88%,transparent),linear-gradient(to bottom,transparent,#000 10%,#000 90%,transparent);-webkit-mask-composite:source-in;mask-image:linear-gradient(to right,transparent,#000 12%,#000 88%,transparent),linear-gradient(to bottom,transparent,#000 10%,#000 90%,transparent);mask-composite:intersect}
.landing h1{color:#fff;font-size:clamp(26px,4vw,38px)}
.landing .pitch p{color:#D3DEE3;font-size:17px;line-height:1.55;margin:12px 0 18px}
.checks{list-style:none;margin:0;padding:0;display:grid;gap:10px;color:#fff;font-weight:600}
.checks li{display:flex;gap:10px;align-items:center}
.checks li::before{content:"";flex:none;width:22px;height:22px;border-radius:50%;background:#F2B75A url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%231B3640' stroke-width='3.2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='M20 6 9 17l-5-5'/%3E%3C/svg%3E") center/14px no-repeat}
.authcard{padding:24px;border-radius:20px}
.authcard form .btn{background:var(--accent);color:var(--on-accent)}
.authcard form .btn:hover{background:var(--accent)}
.avatar.online{box-shadow:0 0 0 3px var(--panel),0 0 0 6px #16A34A}
@media(max-width:820px){.landing{padding:22px;gap:22px}.landing .logo{max-width:340px;margin:0 auto 4px}.landing .checks{display:none}}
@media(max-width:480px){.brand span{display:none}.landing{padding:16px;border-radius:22px}.landing h1{font-size:24px}}
@media(max-width:820px){
  .landing .pitch h1,.landing .pitch p{display:none}
  .landing .logo{max-width:230px;margin:0 auto}
  .landing{padding:14px;gap:6px}
  .authcard{padding:16px}
  .authcard .field{margin-bottom:8px}
  .authcard input{min-height:44px}
  .authcard .tabs{margin-bottom:10px}
}
.saving{background:var(--okbg);color:var(--okfg);border-radius:10px;padding:8px 12px;font-size:13.5px;font-weight:600;line-height:1.4}

/* Barra de carga */
.loader{max-width:360px;margin:12vh auto;text-align:center}
.loadbar{height:6px;margin-top:12px;background:var(--well);border-radius:999px;overflow:hidden;position:relative}
.loadbar>i{position:absolute;inset:0 auto 0 0;width:40%;background:var(--accent);border-radius:999px;animation:loadmove 1.2s ease-in-out infinite}
@keyframes loadmove{0%{left:-40%}100%{left:100%}}
@media(prefers-reduced-motion:reduce){.loadbar>i{animation:none;width:100%;opacity:.5}}

/* Figuras de apoyo */
.figs{display:grid;gap:10px;margin:0 0 14px}
.fig{display:block;border:1px solid var(--line,#d9dce6);border-radius:12px;background:#fff;overflow:hidden}
.fig img{display:block;width:100%;height:auto}