:root{--teal:#03989e;--mint:#9dd9d2;--green:#30bead;--ink:#121a19;--muted:#526360;--wash:#f2faf8;--line:#d9e7e3;--shadow:0 8px 0 #e7efec,0 14px 34px #183b3510}*{box-sizing:border-box}body{margin:0;background:white;color:var(--ink);font:17px/1.6 Roboto,'Segoe UI',Arial,sans-serif}button,input,select{font:inherit}button,a,input,select,summary{-webkit-tap-highlight-color:transparent}button,a,summary{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.6}a{color:#006b70;text-underline-offset:4px}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #111;outline-offset:5px}header{max-width:1280px;margin:auto;padding:26px 42px;display:flex;align-items:center;gap:32px;border-bottom:1px solid var(--line)}.brand{display:flex;margin-right:auto}.brand img{width:206px;height:auto}nav{display:flex;gap:28px}nav a{color:var(--ink);text-decoration:none;font-size:15px;font-weight:650}nav a:hover{color:#007479}.icon-button,.secondary{background:white;border:1px solid var(--line);border-radius:14px;padding:11px 19px;min-height:48px;color:var(--ink);font-weight:650}.icon-button span{background:var(--mint);border-radius:6px;padding:2px 5px;margin:0 3px}.primary{background:var(--teal);color:#fff;border:2px solid #00747a;border-radius:14px;padding:13px 25px;min-height:52px;font-weight:750;box-shadow:0 4px 0 #006b70;text-decoration:none;display:inline-flex;justify-content:center;align-items:center;gap:12px}.primary:hover{background:#007f85}.primary:active{transform:translateY(2px);box-shadow:0 2px 0 #006b70}.secondary:hover,.icon-button:hover{background:var(--wash);border-color:var(--teal)}main{max-width:1180px;margin:auto;padding:42px 28px 80px;min-height:72vh}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(36px,5vw,66px);line-height:1.1;letter-spacing:-2.5px;margin-bottom:24px}h2{font-size:32px;line-height:1.2;letter-spacing:-.8px}h3{font-size:21px;line-height:1.3}p{margin-bottom:20px}.eyebrow{text-transform:uppercase;font-size:12px;letter-spacing:2px;font-weight:800;color:#006f73;margin-bottom:16px}.hero{display:grid;grid-template-columns:1.15fr 1fr;gap:25px;align-items:center;padding:24px 0 58px}.hero .intro{max-width:520px;font-size:19px;color:var(--muted)}.hero h1 em{font-style:normal;position:relative;display:inline-block}.hero h1 em:after{content:'';position:absolute;bottom:-7px;left:0;width:100%;height:9px;background:var(--mint);z-index:-1;border-radius:80%}.hero-art{position:relative;height:350px;display:flex;align-items:center;justify-content:center}.orbit{position:absolute;background:var(--wash);width:330px;height:310px;transform:rotate(-9deg);border-radius:40% 60% 45% 55%;border:1px solid #d4efea}.floating-word{position:absolute;background:white;border:1px solid var(--line);border-radius:22px;box-shadow:var(--shadow);padding:16px 22px;text-align:center;width:175px;transform:rotate(-8deg);left:20px;top:35px}.floating-word.second{transform:rotate(8deg);left:auto;right:10px;top:110px}.floating-word img{height:110px;max-width:130px;object-fit:contain;display:block;margin:auto}.floating-word b{font-size:29px;letter-spacing:2px}.floating-word small{display:block;color:var(--muted)}.art-note{position:absolute;bottom:0;left:55px;background:var(--mint);border-radius:99px;padding:7px 17px;font-size:13px;font-weight:650;transform:rotate(-3deg)}.mini{font-size:13px;color:var(--muted);margin-top:17px}.section-head{display:flex;align-items:end;justify-content:space-between;margin:20px 0 24px;gap:15px}.section-head h2{margin-bottom:6px}.section-head p{margin:0;color:var(--muted)}.pill{display:inline-block;border:1px solid #b9dcd5;border-radius:99px;padding:5px 12px;font-size:12px;font-weight:700;background:var(--wash);white-space:nowrap}.topic-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:23px}.topic{border:1px solid var(--line);border-radius:22px;padding:24px;box-shadow:0 5px 0 #edf3f0;position:relative;display:flex;flex-direction:column;min-height:255px;text-decoration:none;color:var(--ink);transition:transform .18s,box-shadow .18s;background:white}.topic:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#82c8bf}.topic-top{display:flex;justify-content:space-between;align-items:start;margin-bottom:20px}.topic-num{font:800 15px/1.2 inherit;color:#00787d;background:#e8f6f3;border-radius:10px;padding:7px 10px}.topic img{height:74px;width:90px;object-fit:contain;transform:rotate(6deg)}.topic h3{margin-bottom:9px}.topic p{color:var(--muted);font-size:14px;margin:0 0 18px}.topic .bottom{margin-top:auto;display:flex;justify-content:space-between;font-size:12px;font-weight:650;color:#006d72}.notice{background:var(--wash);border:1px solid #c8e4de;border-radius:20px;padding:23px 28px;margin-top:36px;display:flex;gap:25px;align-items:center}.notice img{width:75px;height:75px;object-fit:contain}.notice p{margin:0;color:var(--muted)}.notice b{color:var(--ink)}footer{max-width:1180px;margin:auto;border-top:1px solid var(--line);padding:26px 28px;display:flex;align-items:center;gap:25px;color:var(--muted);font-size:13px}footer img{width:130px}footer a{margin-left:auto}.back{display:inline-block;font-size:14px;margin-bottom:24px;text-decoration:none}.unit-head{max-width:770px;margin-bottom:30px}.unit-head h1{font-size:43px}.unit-head p{color:var(--muted);font-size:18px}.tabs{display:flex;gap:10px;flex-wrap:wrap;margin:25px 0 30px}.tabs a{border:1px solid var(--line);padding:9px 19px;border-radius:12px;text-decoration:none;color:var(--ink);font-weight:650;font-size:15px}.tabs a.active{background:var(--mint);border-color:#65b7ae}.lesson-layout{display:grid;grid-template-columns:230px 1fr;gap:32px}.lesson-menu{display:flex;flex-direction:column;gap:6px}.lesson-menu button{text-align:left;background:white;border:0;padding:13px 15px;border-radius:12px;color:var(--muted);font-size:14px}.lesson-menu button.active{background:var(--wash);color:#006c70;border-left:3px solid var(--teal);font-weight:700}.panel{border:1px solid var(--line);border-radius:24px;padding:32px;box-shadow:var(--shadow);background:white}.panel h2{font-size:29px}.callout{border-left:4px solid var(--green);background:var(--wash);padding:17px 20px;border-radius:0 12px 12px 0;margin:22px 0;font-size:15px}.word-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(145px,1fr));gap:14px}.word-card{text-align:center;padding:16px 12px;border-radius:17px;background:#fbfdfc;border:1px solid var(--line)}.word-card img{height:85px;width:110px;object-fit:contain}.word-card .word{font-size:26px;letter-spacing:1px;font-weight:800;display:block;margin-top:9px}.word-card small{display:block;font-size:13px;color:var(--muted);min-height:24px;margin:6px 0 12px}.word-card button{border:1px solid #bbdcd6;border-radius:99px;background:white;color:#006c70;font-size:13px;padding:7px 13px;min-height:42px}.word mark{background:transparent;color:inherit;border:2px solid var(--teal);border-radius:50%;padding:2px 3px;margin:0 1px}.word .changed{text-decoration:underline;text-decoration-thickness:4px;text-decoration-color:var(--green);text-underline-offset:7px}.text-link{font-size:13px}.lesson-foot{display:flex;justify-content:space-between;gap:18px;align-items:center;margin-top:28px}.silent-lab{text-align:center;background:var(--wash);border-radius:18px;padding:20px;margin-bottom:24px}.silent-lab .word{font-size:40px;font-weight:800;letter-spacing:3px;margin:12px}.small{font-size:13px;color:var(--muted)}.practice{max-width:760px;margin:auto}.practice-bar{display:flex;justify-content:space-between;align-items:center;font-size:13px;color:var(--muted);margin-bottom:12px}.progress{height:6px;background:#e6f3ef;border-radius:9px;margin-bottom:25px;overflow:hidden}.progress span{display:block;background:var(--green);height:100%;transition:width .3s}.question-card{padding:35px;text-align:center}.question-card h2{font-size:27px}.question-card .prompt-word{font-size:46px;font-weight:800;margin:12px 0 20px;letter-spacing:4px}.listen-big{background:var(--mint);border:1px solid #73bdb5;border-radius:50%;width:96px;height:96px;font-size:32px;margin:4px 0 23px;box-shadow:0 5px 0 #d8ede8}.options{display:grid;grid-template-columns:1fr 1fr;gap:13px;margin-top:24px}.option{min-height:64px;border:2px solid var(--line);border-radius:15px;background:white;padding:13px;font-size:19px;font-weight:650;color:var(--ink)}.option:hover:not(:disabled){background:var(--wash);border-color:var(--teal)}.option.correct{border-color:#00846d;background:#dff5eb;color:#144f3e;opacity:1}.option.wrong{border-color:#9c5846;background:#fff2ed;opacity:1}.option img{height:90px;width:110px;object-fit:contain;display:block;margin:auto}.letter-options{display:flex;justify-content:center;gap:10px;flex-wrap:wrap}.letter-options .option{min-width:62px;font-size:30px}.feedback{text-align:left;border-radius:15px;background:var(--wash);padding:20px;margin-top:25px;border:1px solid #bbded5}.feedback h3{margin-bottom:8px}.feedback p{font-size:16px;margin:0 0 16px}.feedback .actions{display:flex;gap:12px;flex-wrap:wrap}.hint{color:var(--muted);font-size:14px}.done-img{height:120px}.group-row{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin:14px 0}.group-row b{width:90px}.group-row select{flex:1}.group-row .row-result{font-size:13px;width:100%;text-align:left}.compare-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.compare-card h3{text-transform:uppercase;margin-bottom:0}.compare-card .models{display:grid;grid-template-columns:1fr 1fr;gap:15px;margin:18px 0}.model{background:var(--wash);border-radius:15px;padding:15px}.model strong{display:block;margin-bottom:12px;font-size:21px}.compare-card p{font-size:14px;color:var(--muted);margin-bottom:0}.record-box{margin:24px 0;padding:23px;border:1px solid var(--line);border-radius:18px;background:var(--wash)}.record-actions{display:flex;gap:10px;flex-wrap:wrap}.record-box audio{width:100%;margin-top:18px}.recording{border-color:#9c5846!important;background:#fff2ed!important}.search{padding:13px 17px;border:1px solid #9bbdb4;border-radius:13px;width:100%;margin-bottom:25px}.filter-row{display:flex;gap:15px;align-items:center;flex-wrap:wrap;margin-bottom:20px}.filter-row select{flex:1}.bank-grid{grid-template-columns:repeat(auto-fill,minmax(175px,1fr))}.reading{max-width:760px}details{border:1px solid var(--line);border-radius:14px;padding:15px 20px;margin:15px 0}summary{cursor:pointer;font-weight:650}dialog{border:1px solid var(--line);border-radius:23px;padding:32px;max-width:510px;width:calc(100% - 32px);box-shadow:0 25px 90px #0003}dialog::backdrop{background:#12352d66;backdrop-filter:blur(3px)}dialog h2{font-size:28px}dialog label{display:block;font-size:14px;font-weight:650;margin:18px 0 7px}select{border:1px solid #a1c2b9;border-radius:10px;background:white;padding:11px;max-width:100%;color:var(--ink)}dialog select{width:100%}.check{display:flex!important;align-items:center;gap:10px}.check input{width:20px;height:20px;accent-color:var(--teal)}.close{float:right;border:0;background:var(--wash);border-radius:50%;font-size:26px;width:40px;height:40px}.skip{position:fixed;top:-100px;background:white;z-index:10;padding:10px}.skip:focus{top:0}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);max-width:90vw;width:max-content;max-height:30vh;overflow:auto;background:#193d37;color:white;border-radius:14px;padding:0;z-index:100;font-size:14px;box-shadow:0 8px 25px #0002}#toast.visible{padding:15px 22px}.hide-ipa .ipa{display:none}.empty{padding:30px;color:var(--muted)}.chip{display:inline-block;font-size:12px;padding:2px 9px;background:var(--mint);border-radius:7px}.hidden{display:none!important}@media(max-width:900px){header{padding:20px 25px;gap:20px}.brand img{width:170px}nav{gap:18px}.hero{gap:0}.floating-word{width:150px;left:0}.floating-word.second{right:0}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.lesson-layout{grid-template-columns:180px 1fr;gap:20px}.panel{padding:25px}.orbit{width:260px;height:280px}.art-note{left:0;font-size:11px}.hero-art{height:330px}h1{font-size:48px}}@media(max-width:620px){body{font-size:16px}header{padding:18px 18px;flex-wrap:wrap;gap:16px}.brand img{width:155px}.icon-button{padding:8px 12px;font-size:13px;order:1}nav{order:2;width:100%;justify-content:space-between;border-top:1px solid var(--line);padding-top:13px}nav a{font-size:14px}main{padding:27px 18px 50px}.hero{grid-template-columns:1fr;padding:12px 0 30px}.hero h1{font-size:44px;letter-spacing:-1.7px}.hero .intro{font-size:17px}.hero-art{height:290px;max-width:360px;width:100%;margin:15px auto 0}.floating-word{left:5px;top:20px}.floating-word.second{right:5px;top:65px}.art-note{left:20px;bottom:10px}.orbit{height:220px;width:280px}.topic-grid{gap:17px;grid-template-columns:1fr}.topic{min-height:195px;padding:22px}.topic-top{margin-bottom:3px}.topic img{height:65px}.section-head{align-items:start}.section-head h2{font-size:27px}.section-head .pill{font-size:10px}.notice{padding:18px;gap:12px}.notice img{width:50px}.notice p{font-size:14px}footer{flex-wrap:wrap;gap:12px;padding:22px 18px}footer a{margin-left:0;width:100%}.unit-head h1{font-size:34px;letter-spacing:-1px}.unit-head p{font-size:16px}.lesson-layout{grid-template-columns:1fr}.lesson-menu{flex-direction:row;overflow:auto;padding-bottom:6px}.lesson-menu button{min-width:155px;font-size:13px}.panel{padding:22px 18px;border-radius:19px}.panel h2{font-size:25px}.word-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.word-card .word{font-size:22px}.word-card img{max-width:100%;height:70px}.lesson-foot{align-items:start;flex-wrap:wrap}.compare-grid{grid-template-columns:1fr}.question-card .prompt-word{font-size:35px}.options{gap:10px}.option{font-size:17px;padding:10px}.tabs{gap:7px}.tabs a{padding:8px 13px;font-size:14px}.group-row b{width:65px}.model strong{font-size:18px}.bank-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
main:focus{outline:none}

/* Explicaciones progresivas y vocabulario ilustrado */
.lesson-explanation{max-width:65ch;font-size:18px;line-height:1.8;margin-bottom:24px}
.try-step{margin-top:24px;padding:22px;background:#effaf7;border:1px solid #b5dfd5;border-radius:18px}
.try-step h3{font-size:19px;margin-bottom:10px}.try-step p{margin:0;max-width:65ch}
.lesson-detail{margin:22px 0;border:1px solid var(--line);border-radius:14px;padding:16px 20px}
.lesson-detail summary{font-weight:700;color:#006c70;cursor:pointer}.lesson-detail p{font-size:16px;line-height:1.8;margin:18px 0 0;max-width:65ch}
.vocab-image{display:block;width:160px;height:140px;object-fit:contain;margin:0 auto 12px;background:white;border-radius:12px}
.word-card img{height:120px;width:100%;max-width:160px;object-fit:contain;background:white;border-radius:10px}
.option-image{display:block;width:100%;height:95px;object-fit:contain;margin-bottom:8px;border-radius:9px;background:white}
.group-image{width:50px;height:50px;object-fit:contain;background:white;border-radius:8px}
.group-row{grid-template-columns:50px minmax(60px,1fr) auto minmax(110px,1.3fr)}
.compare-card>.vocab-image{height:125px}.option span{display:block}
@media(max-width:600px){.lesson-explanation{font-size:17px}.try-step{padding:17px}.group-row{grid-template-columns:40px minmax(50px,1fr) auto}.group-row select{grid-column:2/-1;width:100%}.group-image{width:40px;height:40px}.word-card img{height:105px}}

.group-row{display:grid}.group-row b{width:auto}.group-row .row-result{grid-column:1/-1}

.question-pictures{display:flex;flex-wrap:wrap;gap:16px;justify-content:center;margin:20px 0}.question-pictures figure{margin:0}.question-pictures .vocab-image{width:100px;height:85px;margin-bottom:4px}.question-pictures figcaption{font-size:13px;font-weight:700}

.word-ipa{font-family:"Segoe UI","Arial",sans-serif;color:#006b70;font-size:16px;letter-spacing:0;font-weight:500}.word-card>.word-ipa{display:block;margin:7px 0 4px}.inline-example .word-ipa{font-size:.95em;white-space:nowrap}.inline-example{display:inline}.hide-ipa .ipa{display:none!important}

/* Lectura sencilla: una idea por párrafo. */
.lesson-explanation p{margin:0 0 16px}.lesson-explanation p:last-child{margin-bottom:0}.concept-check{margin:24px 0;padding:20px;border:2px dashed #9dd9d2;border-radius:18px}.concept-check h3{font-size:19px;margin:0 0 12px}.concept-check p{max-width:65ch;line-height:1.75}.concept-check summary{cursor:pointer;color:#006b70;font-weight:700}.concept-check details{margin-top:12px}

.try-step ol{padding-left:24px;margin:0}.try-step li{padding-left:4px;margin:8px 0;line-height:1.7}

/* Cuadro fonético: símbolos visibles incluso si se oculta IPA en las lecciones. */
.chart-heading{display:flex;align-items:center;gap:30px}.chart-heading>div{flex:1}.chart-heading>img{object-fit:contain}.chart-intro{padding:22px;border-radius:20px;background:#effaf7;border:1px solid #9dd9d2}.chart-intro p{margin:12px 0 0;max-width:75ch}.chart-toolbar{display:flex;gap:20px;align-items:center;flex-wrap:wrap;margin:24px 0}.sound-section{margin:34px 0}.sound-section .section-head{margin-bottom:18px}.sound-section h2{font-size:28px}.sound-section .section-head p{font-size:15px;margin:8px 0 0}.sound-grid{display:grid;grid-template-columns:repeat(6,minmax(0,1fr));gap:12px}.sound-grid.vowels,.sound-grid.diphthongs{grid-template-columns:repeat(4,minmax(0,1fr))}.sound-tile{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:6px;min-height:156px;padding:15px 8px;background:white;border:1px solid #b9d6d1;border-radius:18px;color:#172d2c;box-shadow:0 3px 0 #e1f1ee}.sound-tile:hover,.sound-tile:focus-visible{border-color:#03989e;background:#effaf7;outline:3px solid #9dd9d2;outline-offset:2px}.sound-tile.has-note{border-top:4px solid #03989e}.sound-symbol{font-family:'Segoe UI',Arial,sans-serif;font-size:36px;line-height:1.2;font-weight:650;color:#006b70}.sound-example{font-size:16px;font-weight:700}.sound-play{font-size:12px;color:#3e625f}.sound-badge{font-size:11px;line-height:1.4;background:#effaf7;border-radius:20px;padding:4px 8px;min-height:23px}.has-note .sound-badge{background:#d8eeeb;color:#005e63}.chart-link{margin:26px 0;display:flex;gap:24px;align-items:center;justify-content:space-between;padding:28px;border:2px solid #9dd9d2;border-radius:22px;background:#f7fcfb}.chart-link h2{font-size:26px;margin:8px 0}.chart-link p{max-width:55ch;margin:0}.chart-link>a{flex-shrink:0}.chart-sources{line-height:1.7;margin-top:24px}#soundDialog{max-width:700px;max-height:90vh;overflow:auto}#soundDialog h2{font-size:25px;clear:both;padding-top:12px}.sound-word{display:flex;align-items:center;gap:22px;margin:18px 0}.sound-word>.vocab-image{width:130px;height:110px;margin:0}.sound-word .word{font-size:30px;font-weight:800}.sound-word p{margin:6px 0}.sound-models{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:22px 0}.sound-models .eyebrow{font-size:11px}.sound-models strong{font-family:'Segoe UI',Arial,sans-serif}.sound-models button{font-size:14px}header nav{flex-wrap:wrap}
@media(max-width:900px){.sound-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.chart-link{align-items:flex-start;flex-direction:column}.chart-heading>img{width:90px;height:90px}}
@media(max-width:620px){.chart-heading{gap:10px}.chart-heading>img{display:none}.sound-grid,.sound-grid.vowels,.sound-grid.diphthongs{grid-template-columns:repeat(3,minmax(0,1fr));gap:9px}.sound-tile{min-height:143px;padding:12px 4px}.sound-symbol{font-size:30px}.sound-badge{font-size:10px;padding:4px}.sound-section h2{font-size:24px}.chart-toolbar{gap:12px}.sound-word{gap:12px}.sound-word>.vocab-image{width:95px;height:90px}.sound-word .word{font-size:26px}#soundDialog{padding:22px 16px}.sound-models{gap:10px}.sound-models .model{padding:12px 8px}.sound-models button{padding:10px;font-size:13px}header nav{gap:10px}.chart-link{padding:20px}}

.ecosystem-nav{display:flex;justify-content:center;align-items:center;gap:8px;flex-wrap:wrap;width:100%;padding:10px 18px;border-bottom:1px solid #d9e7e3;background:#f2faf8;box-sizing:border-box}.ecosystem-nav a{display:inline-flex;align-items:center;min-height:40px;padding:7px 14px;color:#264b48;font:600 14px/1.3 Arial,sans-serif;text-decoration:none;border-radius:9px;white-space:nowrap}.ecosystem-nav a:hover{background:#dcf2ed}.ecosystem-nav a[aria-current=page]{color:#006b70;background:#d7eeea}.ecosystem-nav a:focus-visible{outline:3px solid #111;outline-offset:3px}@media(max-width:620px){.ecosystem-nav{gap:2px;padding:8px}.ecosystem-nav a{font-size:12px;padding:7px 9px}}