:root{--ink:#20201e;--paper:#fcfcfa;--pink:#ee86a5;--aqua:#b9e9e5;--mono:'Courier New',Courier,monospace}
body{background:var(--paper);color:var(--ink)}
.shell{min-height:100vh;padding-bottom:56px;background:var(--paper);font:16px/1.6 var(--mono)}
.header{min-height:72px;padding:14px clamp(18px,5vw,72px);display:flex;align-items:center;justify-content:space-between;gap:20px;background:transparent;border-bottom:1px solid var(--ink)}
.wordmark{font-size:22px;font-weight:700;letter-spacing:-.06em}.wordmark span{color:#a72f59}
.header>div{display:grid;text-align:right}.header small{font-size:11px;letter-spacing:.08em}.header strong{font-size:18px}
.content{width:min(1120px,calc(100% - 64px));margin:0 auto;padding-top:36px}
.initialWelcome{padding:8px 0 32px;background:transparent;border-bottom:1px solid var(--ink)}
.initialWelcome>p{font-size:12px;letter-spacing:.08em;color:#812640}
.initialWelcome h1{max-width:900px;margin:12px 0 8px;font-size:clamp(32px,4.5vw,58px);font-weight:700;line-height:1.1;letter-spacing:-.06em}
.initialWelcome>strong{display:block;margin:24px 0 4px;font-size:20px}
.welcomeLine{max-width:900px;margin-top:18px}.welcomeLine>span:first-child{display:block;font-size:16px}
.translation{display:block;max-width:900px;margin-top:4px;color:#625158;font-size:14px;line-height:1.6}
.nextClass{margin-top:28px;padding:26px 30px;border:1px solid var(--ink);background-color:var(--aqua);background-image:radial-gradient(#5d9294 .6px,transparent .8px);background-size:6px 6px}
.nextClass>p{font-size:14px;font-weight:700}.nextClass h1{margin:8px 0 10px;font-size:clamp(28px,4vw,42px);font-weight:700;line-height:1.12;letter-spacing:-.05em}.nextClass>span{display:block;max-width:850px;font-size:16px}
.taskTabs{padding:28px 0 18px;display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px}
.taskTabs button{min-width:0;min-height:80px;padding:12px 14px;border:1px solid var(--ink);background:transparent;text-align:left;color:var(--ink)}
.taskTabs button small{display:block;font-size:11px;letter-spacing:.04em}.taskTabs button strong{display:block;margin-top:5px;font-size:15px;line-height:1.35;overflow-wrap:anywhere}
.taskTabs button:hover{background:#e6f4f1}.taskTabs button.active{background:var(--ink);color:var(--paper);box-shadow:3px 3px 0 var(--pink)}.taskTabs button.active small{color:#f8b9ce}
.activity{--stage:var(--pink);--dot:#774353;padding:clamp(16px,3vw,30px);border:1px solid var(--ink);background-color:var(--stage);background-image:radial-gradient(var(--dot) .6px,transparent .8px);background-size:6px 6px}
.activity[data-tone=aqua]{--stage:var(--aqua);--dot:#5d9294}
.activityHead{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:22px}.activityHead>div{min-width:0}.activityHead small{font-size:12px;letter-spacing:.02em}.activityHead h2{margin:8px 0;font-size:clamp(25px,3.4vw,38px);font-weight:700;line-height:1.15;letter-spacing:-.05em}.activityHead p{font-size:15px;font-weight:700}.activityHead>span{padding:6px 10px;border:1px solid var(--ink);font-size:13px;white-space:nowrap;background:transparent}
.embed{overflow:hidden;border:1px solid var(--ink);background:transparent;box-shadow:3px 3px 0 var(--paper),4px 4px 0 var(--ink)}.embed iframe{display:block;width:100%;height:600px;border:0}
.external{display:inline-block;margin-top:18px;color:var(--ink);font-size:13px;font-weight:700;text-decoration:underline;text-underline-offset:4px}
.actions{margin-top:24px;display:flex;justify-content:space-between;gap:12px}.actions button{min-height:44px;padding:10px 16px;border:1px solid var(--ink);background:transparent;font-size:14px;font-weight:700;color:var(--ink)}.actions .next{background:var(--ink);color:var(--paper)}.actions button:disabled{opacity:.4;cursor:not-allowed}
button:focus-visible,a:focus-visible{outline:3px solid #075f65;outline-offset:4px}
@media(max-width:760px){.content{width:calc(100% - 36px);padding-top:26px}.taskTabs{grid-template-columns:repeat(2,minmax(0,1fr))}.embed iframe{height:500px}.nextClass{padding:22px}.activityHead{gap:12px}}
@media(max-width:420px){.content{width:calc(100% - 24px)}.header{padding:14px 12px}.wordmark{font-size:20px}.initialWelcome h1{font-size:34px}.taskTabs button{padding:11px;min-height:86px}.taskTabs button strong{font-size:14px}.activityHead>span{padding:5px;font-size:12px}.activityHead h2{font-size:26px}.actions button{padding:10px 12px}.welcomeLine>span:first-child{font-size:15px}.translation{font-size:13px}}

/* Legibilidad: texto principal sans serif; código solo en etiquetas sobre negro. */
.shell{font:18px/1.6 Arial,Helvetica,sans-serif}
.shell button{font-family:Arial,Helvetica,sans-serif;cursor:pointer}
.initialWelcome h1,.nextClass h1,.activityHead h2{letter-spacing:-.035em}
.welcomeLine>span:first-child,.nextClass>span{font-size:18px;line-height:1.65}
.translation{font-size:16px;color:#50504c;line-height:1.6}
.initialWelcome>p,.activityHead small{display:inline-block;padding:5px 9px;background:var(--ink);color:#fff;font:12px/1.5 var(--mono);letter-spacing:.03em}
.nextClass{background:#e7f5f3}
.nextClass>p{font-size:16px}
.taskTabs button small{font-size:12px;letter-spacing:.02em}
.taskTabs button strong{font-size:17px;line-height:1.4}
.activityHead{padding:20px;background:var(--paper);border:1px solid var(--ink)}
.activityHead p{font-size:18px;font-weight:400;line-height:1.5}
.activityHead>span{background:var(--paper);font-size:14px}
.external{background:var(--paper);padding:8px 10px;font-size:14px}
.actions button{background:var(--paper);font-size:16px}
.actions .next{background:var(--ink);color:var(--paper)}
@media(max-width:420px){.welcomeLine>span:first-child,.nextClass>span{font-size:17px}.translation{font-size:15px}.taskTabs button strong{font-size:16px}.activityHead{padding:14px;gap:8px}.activityHead h2{font-size:27px}.activityHead p{font-size:17px}.activityHead>span{display:none}}
.trackingNote{padding:14px 18px;margin:0 0 18px;background:var(--paper);border:1px solid var(--ink);font:16px/1.5 Arial,Helvetica,sans-serif}.trackingNote span{display:block;margin-top:5px;color:#50504c;font-size:14px}