:root{font-family:var(--brand-font),sans-serif;color:#1e3a8a;background:#fbf9f5;font-synthesis:none;text-rendering:optimizeLegibility}*{box-sizing:border-box}body{margin:0;min-width:320px}.skip-link{position:absolute;left:12px;top:-50px;background:white;padding:12px;z-index:4;border:2px solid #2563eb;border-radius:8px}.skip-link:focus{top:12px}.site-header{width:min(1120px,calc(100% - 36px));margin:auto;min-height:94px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid #e4e7ee}.logo{display:block;width:205px;height:auto}.prototype-tag{display:inline-flex;align-items:center;min-height:34px;padding:4px 13px;border-radius:999px;background:#fff1e8;color:#8a3500;font-size:13px;font-weight:800}.shell{width:min(920px,calc(100% - 36px));margin:0 auto;padding:42px 0 76px}.shell.narrow{width:min(720px,calc(100% - 36px))}.intro{max-width:720px;margin:4px 0 26px}.intro.compact{margin-top:26px}.eyebrow{font-size:12px;letter-spacing:.09em;font-weight:800;color:#2563eb;margin:0 0 8px}.intro h1{font-size:clamp(38px,6vw,58px);letter-spacing:-.04em;line-height:1.08;color:#1e3a8a;margin:0 0 14px}.intro h1 span{color:#f97316}.intro>p:last-child{font-size:17px;max-width:650px;margin:0;line-height:1.6}.demo-warning{border:1px solid #fbbf24;border-left:5px solid #f97316;border-radius:14px;background:#fff9e7;padding:15px 18px;margin:20px 0 24px;color:#493414;line-height:1.5}.demo-warning strong{display:block;color:#1e3a8a}.panel{background:white;border:1px solid #e4e7ee;border-radius:22px;padding:24px;margin:18px 0;box-shadow:0 4px 0 rgba(30,58,138,.05)}.panel-heading{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:20px}.panel h2,.learning-note h2{font-size:22px;line-height:1.25;margin:0;color:#1e3a8a}.panel-heading .eyebrow{margin-bottom:4px}.pill{border-radius:999px;padding:7px 12px;background:#f1f2f5;color:#475569;font-size:13px;font-weight:750;white-space:nowrap}.pill.active{background:#eef5d8;color:#365314}.setup-grid{display:grid;grid-template-columns:minmax(0,1fr) auto;gap:24px;align-items:end}label{display:block;font-size:14px;font-weight:750;margin-bottom:7px;color:#1e3a8a}select,input,textarea{width:100%;min-height:48px;border:1px solid #a7afbd;border-radius:10px;padding:10px 12px;color:#172554;background:white;font:inherit}textarea{resize:vertical}.hint{font-size:13px;line-height:1.5;margin:8px 0 0;color:#475569;max-width:420px}.actions{display:flex;gap:9px;flex-wrap:wrap}.button{display:inline-flex;align-items:center;justify-content:center;min-height:46px;border-radius:999px;padding:10px 17px;border:2px solid transparent;font:700 14px var(--brand-font);cursor:pointer;text-decoration:none;transition:transform .15s,box-shadow .15s}.button:hover:not(:disabled){transform:translateY(-1px)}.button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid #2563eb;outline-offset:3px}.button.primary{background:#f97316;border-color:#f97316;color:#172554;box-shadow:0 3px 0 rgba(249,115,22,.24)}.button.secondary{background:white;border-color:#2563eb;color:#1e3a8a}.button.text{background:transparent;border-color:transparent;color:#1e3a8a;text-decoration:underline;text-underline-offset:3px}.button:disabled{opacity:.52;cursor:not-allowed;box-shadow:none}.sales-link{font-size:14px;margin:18px 0 0}.sales-link a,.back-link{color:#1e3a8a;font-weight:800;text-underline-offset:3px}.empty-state{background:#f8fafc;border-radius:14px;padding:20px;color:#475569}.join-card{display:flex;align-items:center;justify-content:space-between;gap:16px;background:#eef3ff;border-radius:16px;padding:18px}.small-label{display:block;font-size:11px;letter-spacing:.1em;font-weight:800;color:#1e3a8a}.session-code{display:block;color:#1e3a8a;font-size:28px;letter-spacing:.12em;margin-top:4px}.session-meta{display:flex;justify-content:space-between;gap:12px;font-size:13px;color:#475569;margin:12px 2px 0}.roster-heading{margin-bottom:14px}.count{font-size:15px;font-weight:800;color:#1e3a8a}.participant-form{display:flex;align-items:end;gap:12px}.field-grow{flex:1}.reconnect{margin-top:8px;padding-inline:0}.status-message{min-height:22px;margin:8px 0;color:#1e3a8a;font-size:14px;font-weight:650}.roster{list-style:none;padding:0;margin:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.roster li{display:flex;align-items:center;gap:10px;border:1px solid #e4e7ee;border-radius:12px;padding:10px 12px;min-width:0}.roster li span:last-child{overflow-wrap:anywhere}.roster-number{font-size:12px;font-weight:800;color:#2563eb}.learning-note{display:flex;gap:15px;align-items:flex-start;margin:28px 0;padding:20px 2px}.note-icon{display:grid;place-items:center;background:#fbbf24;color:#1e3a8a;width:34px;height:34px;border-radius:50%;flex:none;font-size:20px}.learning-note h2{margin-bottom:5px}.learning-note p{line-height:1.6;margin:0;color:#334155}.site-header+main .back-link{display:inline-block;margin:20px 0 0}.request-form{display:grid;gap:17px}.field{min-width:0}.consent{display:flex;align-items:flex-start;gap:10px;color:#334155;font-weight:600}.consent input{width:20px;height:20px;min-height:20px;margin:0;flex:none;accent-color:#2563eb}.request-form .button{justify-self:start}footer{width:min(1120px,calc(100% - 36px));margin:auto;min-height:70px;border-top:1px solid #e4e7ee;display:flex;justify-content:space-between;align-items:center;gap:12px;color:#475569;font-size:13px;padding:12px 0}@media(max-width:740px){.setup-grid{grid-template-columns:1fr}.actions{display:grid;grid-template-columns:1fr 1fr}.actions .text{grid-column:1/-1;justify-self:start}.panel{padding:19px;border-radius:18px}.site-header{min-height:78px}.logo{width:175px}.participant-form{align-items:stretch;flex-direction:column}.participant-form .button{align-self:flex-start}.roster{grid-template-columns:1fr}.session-code{font-size:23px}.join-card{align-items:flex-start;flex-direction:column}.session-meta{flex-direction:column;gap:4px}}@media(max-width:420px){.shell{padding-top:28px}.panel-heading{align-items:flex-start;flex-direction:column}.site-header{width:calc(100% - 28px)}.prototype-tag{font-size:11px}.actions{grid-template-columns:1fr}.actions .text{grid-column:auto}.button{width:100%}.button.text{width:auto}.join-card .button{width:100%}footer{align-items:flex-start;flex-direction:column;justify-content:center}.intro h1{font-size:39px}}@media(prefers-reduced-motion:reduce){*,*:before,*:after{scroll-behavior:auto!important;animation:none!important;transition:none!important}.button:hover:not(:disabled){transform:none}}
.intro-with-art{display:grid;grid-template-columns:minmax(0,1fr) minmax(220px,.62fr);gap:20px;align-items:center;max-width:none}.teacher-character{display:block;width:100%;height:auto;max-height:250px;object-fit:contain}.student-layout{display:grid;grid-template-columns:minmax(0,1fr) minmax(220px,.68fr);gap:22px;align-items:center;margin-top:18px}.student-title{font-size:clamp(38px,5vw,52px);letter-spacing:-.04em;line-height:1.08;color:#1e3a8a;margin:5px 0 12px}.student-title span{color:#f97316}.student-layout>section>p:not(.eyebrow){line-height:1.6}.character-side{margin:0;min-width:0}.character-side img{display:block;width:100%;height:auto;object-fit:contain}.character-side figcaption{font-size:13px;text-align:center;color:#1e3a8a;font-weight:750}.ready-panel{margin-top:20px;padding:18px;border-radius:16px;background:#eef5d8;border:1px solid #84cc16}.ready-panel h2{margin:0 0 8px;color:#1e3a8a;font-size:21px}.ready-panel p{line-height:1.55}.ready-panel .button{margin-top:6px}.student-shell>.back-link{display:inline-block;margin-top:18px}@media(max-width:740px){.intro-with-art{grid-template-columns:1fr}.teacher-character{max-width:280px;max-height:190px;justify-self:center}.student-layout{grid-template-columns:1fr}.character-side{max-width:300px;margin:0 auto}.student-layout .demo-warning{margin-block:16px}.student-layout .character-side{grid-row:1}.student-layout>section{grid-row:2}}@media(max-width:420px){.student-layout{gap:8px}.character-side{max-width:230px}.ready-panel .button{font-size:13px}}
.join-actions{display:flex;flex-wrap:wrap;gap:9px;align-items:center}
.expired-dialog{position:relative;width:min(680px,calc(100% - 32px));padding:28px;border:1px solid #d6dbe5;border-radius:24px;color:#1e3a8a;background:#fff;box-shadow:0 24px 80px rgba(13,24,55,.32)}.expired-dialog::backdrop{background:rgba(13,24,55,.64);backdrop-filter:blur(3px)}.expired-dialog-content{display:grid;grid-template-columns:minmax(150px,.68fr) minmax(0,1fr);gap:22px;align-items:center}.expired-dialog-content img{display:block;width:100%;max-height:290px;object-fit:contain}.expired-dialog h2{font-size:clamp(24px,4vw,32px);line-height:1.12;margin:0 0 12px;color:#1e3a8a}.expired-dialog p:not(.eyebrow){line-height:1.55;color:#334155}.expired-dialog .button{margin-top:5px}.dialog-close{position:absolute;right:12px;top:12px;width:40px;height:40px;border:0;border-radius:50%;background:#f1f5f9;color:#1e3a8a;font-size:28px;line-height:1;cursor:pointer}.dialog-close:focus-visible,.expired-dialog .button:focus-visible{outline:3px solid #2563eb;outline-offset:3px}@media(max-width:560px){.expired-dialog{padding:26px 20px 22px}.expired-dialog-content{grid-template-columns:1fr;gap:10px}.expired-dialog-content img{max-height:200px;justify-self:center}.expired-dialog-content .eyebrow{margin-top:0}}
.activity-name{font-size:20px;font-weight:800;color:#1e3a8a}
.classroom-unavailable{display:grid;grid-template-columns:minmax(150px,.42fr) minmax(0,1fr);gap:24px;align-items:center;margin-top:24px;padding:22px;border:1px solid #d7e0ef;border-radius:18px;background:#f8fafc}.classroom-unavailable[hidden]{display:none}.classroom-unavailable img{display:block;width:100%;max-height:220px;object-fit:contain}.classroom-unavailable h2{margin:0 0 10px;color:#1e3a8a;font-size:clamp(23px,3vw,30px);line-height:1.2}.classroom-unavailable p:not(.eyebrow){margin:0 0 18px;color:#334155;line-height:1.55}@media(max-width:560px){.classroom-unavailable{grid-template-columns:1fr;gap:14px}.classroom-unavailable img{max-height:180px;justify-self:center}}
.teacher-header-actions{display:flex;align-items:center;gap:10px}.teacher-library-button{min-height:38px;padding:7px 13px;font-size:13px}@media(max-width:520px){.teacher-header-actions{gap:6px}.teacher-library-button{padding:6px 10px;font-size:12px}}

/* El enlace de clase puede contener un token largo; se mantiene en una sola línea dentro de su tarjeta. */
.join-card > div:first-child { flex: 1; min-width: 0; }
.session-code { max-width: 100%; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; font-size: clamp(17px, 2.8vw, 28px); letter-spacing: .035em; }

/* Cabecera y pie se alinean con los espacios de trabajo amplios. */
@media (min-width: 1100px) {
  .site-header, footer { width: min(1440px, calc(100% - 64px)); }
}