:root{--ink:#1c2733;--muted:#5b6876;--line:#e4e0d8;--bg:#fbfaf7;--card:#fff;--brand:#0f766e;--brand-ink:#0b5a54;--brand-soft:#e3f2ef;--accent:#f4b23e;--ok:#1f8a4c;--warn:#b7791f;--bad:#c2410c;--bad-soft:#fdece4;--ok-soft:#e5f4ea;--warn-soft:#fbf1dc;--on-brand:#fff;--radius:12px;--shadow:0 1px 2px rgba(28,39,51,.06),0 4px 14px rgba(28,39,51,.05);--sidebar:230px;--tabs:64px}
@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--ink:#e8edf2;--muted:#9aa8b6;--line:#2b3745;--bg:#10171f;--card:#17212b;--brand:#2fb5a8;--brand-ink:#7fdcd2;--brand-soft:#15302f;--accent:#f4b23e;--ok:#4cc27c;--warn:#e3a94a;--bad:#ff8a5c;--bad-soft:#3a2219;--ok-soft:#173424;--warn-soft:#3a2f17;--on-brand:#06201d;--shadow:0 1px 2px rgba(0,0,0,.3)}}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--ink);font:16px/1.5 "Nunito Sans",system-ui,-apple-system,"Segoe UI",sans-serif;min-height:100vh}
h1,h2,h3{line-height:1.2;margin:0}
h1{font-size:1.5rem;font-weight:800}h2{font-size:1.15rem;font-weight:800}h3{font-size:1rem;font-weight:700}
p{margin:0 0 .6em}a{color:var(--brand-ink)}
a,button,input,select,textarea,summary{font:inherit}
:focus-visible{outline:3px solid var(--accent);outline-offset:2px;border-radius:6px}
.sr{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap}
.muted{color:var(--muted)}.small{font-size:.875rem}.right{text-align:right}.bad{color:var(--bad)}.ok{color:var(--ok)}.warn{color:var(--warn)}
.row{display:flex;gap:.6rem;align-items:center;flex-wrap:wrap}.row.between{justify-content:space-between}.grow{flex:1;min-width:0}
.stack{display:grid;gap:1rem}.stack-s{display:grid;gap:.5rem}
.grid2{display:grid;gap:1rem}
@media(min-width:700px){.grid2{grid-template-columns:1fr 1fr}.grid3{grid-template-columns:repeat(3,1fr)}}
.grid3{display:grid;gap:1rem}
/* shell */
#shell{display:none}
body.in #shell{display:block}body.in #auth{display:none}
.side{display:none}
.main{padding:16px 16px calc(var(--tabs) + 24px);max-width:960px;margin:0 auto}
.topbar{display:flex;align-items:center;justify-content:space-between;padding:10px 16px;background:var(--card);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.logo{display:inline-flex;align-items:center;gap:.45rem;font-weight:800;font-size:1.2rem;color:var(--ink);text-decoration:none}
.logo svg{width:26px;height:26px;flex:none}
.tabs{position:fixed;left:0;right:0;bottom:0;height:var(--tabs);background:var(--card);border-top:1px solid var(--line);display:grid;grid-auto-flow:column;grid-auto-columns:1fr;z-index:30;padding-bottom:env(safe-area-inset-bottom,0)}
.tabs a{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;text-decoration:none;color:var(--muted);font-size:.72rem;font-weight:700;min-height:44px}
.tabs a svg,.side a svg{width:22px;height:22px;stroke:currentColor;fill:none;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}
.tabs a[aria-current=page]{color:var(--brand-ink)}.tabs a[aria-current=page] svg{stroke:var(--brand)}
@media(min-width:900px){
 .tabs,.topbar{display:none}
 .side{display:flex;flex-direction:column;gap:4px;position:fixed;inset:0 auto 0 0;width:var(--sidebar);background:var(--card);border-right:1px solid var(--line);padding:18px 12px;overflow:auto}
 .side .logo{padding:0 8px 14px}
 .side a.nav{display:flex;gap:.7rem;align-items:center;padding:10px 12px;border-radius:10px;text-decoration:none;color:var(--ink);font-weight:700;min-height:44px}
 .side a.nav:hover{background:var(--brand-soft)}
 .side a.nav[aria-current=page]{background:var(--brand-soft);color:var(--brand-ink)}
 .side .who{margin-top:auto;padding:10px 8px;border-top:1px solid var(--line);font-size:.875rem}
 .main{margin-left:var(--sidebar);padding:28px 32px 48px;max-width:none}
 .main>.wrap{max-width:900px;margin:0 auto}
}
/* page */
.pagehead{display:flex;justify-content:space-between;align-items:center;gap:.75rem;flex-wrap:wrap;margin:4px 0 16px}
.back{display:inline-flex;align-items:center;min-height:44px;text-decoration:none;font-weight:700}
/* cards */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow)}
.card.flat{box-shadow:none}
.card h2{margin-bottom:.6rem}
.stat{display:flex;flex-direction:column}.stat b{font-size:1.5rem;font-weight:800}.stat span{color:var(--muted);font-size:.875rem}
.list{list-style:none;margin:0;padding:0}
.list>li{display:flex;gap:.75rem;align-items:center;padding:12px 0;border-top:1px solid var(--line)}
.list>li:first-child{border-top:0}
a.item{color:inherit;text-decoration:none}
/* buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.4rem;min-height:44px;padding:0 18px;border-radius:10px;border:1.5px solid var(--brand);background:var(--brand);color:var(--on-brand);font-weight:800;text-decoration:none;cursor:pointer;line-height:1.1;text-align:center}
.btn:hover{background:var(--brand-ink);border-color:var(--brand-ink);color:#fff}
.btn.ghost{background:transparent;color:var(--brand-ink)}.btn.ghost:hover{background:var(--brand-soft);color:var(--brand-ink)}
.btn.danger{background:var(--bad);border-color:var(--bad);color:#fff}.btn.danger.ghost{background:transparent;color:var(--bad)}.btn.danger.ghost:hover{background:var(--bad-soft)}
.btn.sm{min-height:36px;padding:0 12px;font-size:.9rem}
.btn.block{width:100%}
.btn[disabled],.btn[aria-disabled=true]{opacity:.5;cursor:not-allowed;pointer-events:none}
@media(max-width:899px){.btn.sm{min-height:44px}}
.linkbtn{background:none;border:0;color:var(--brand-ink);text-decoration:underline;cursor:pointer;padding:0;min-height:44px}
/* forms */
label.f{display:grid;gap:4px;font-weight:700;font-size:.92rem}
label.f small{font-weight:400;color:var(--muted)}
input[type=text],input[type=email],input[type=password],input[type=number],input[type=date],input[type=time],input[type=tel],input[type=search],input[type=month],select,textarea{width:100%;min-height:44px;padding:9px 12px;border:1.5px solid var(--line);border-radius:10px;background:var(--card);color:var(--ink)}
textarea{min-height:90px;resize:vertical}
textarea.autogrow{min-height:44px;resize:none;overflow:hidden}
@supports (field-sizing:content){textarea.autogrow{field-sizing:content}}
input:focus,select:focus,textarea:focus{outline:3px solid var(--accent);outline-offset:0;border-color:var(--brand)}
.check{display:flex;gap:.6rem;align-items:flex-start;min-height:44px;align-items:center;font-weight:600}
.check input{width:22px;height:22px;accent-color:var(--brand);flex:none}
.form{display:grid;gap:14px}
.form .two{display:grid;gap:14px}@media(min-width:600px){.form .two{grid-template-columns:1fr 1fr}}
.err{color:var(--bad);font-weight:700;background:var(--bad-soft);padding:10px 12px;border-radius:10px}
.err:empty{display:none}
/* chips/badges */
.badge{display:inline-flex;align-items:center;padding:2px 10px;border-radius:99px;font-size:.78rem;font-weight:800;background:var(--brand-soft);color:var(--brand-ink);white-space:nowrap}
.badge.ok{background:var(--ok-soft);color:var(--ok)}.badge.bad{background:var(--bad-soft);color:var(--bad)}.badge.warn{background:var(--warn-soft);color:var(--warn)}.badge.gray{background:var(--line);color:var(--muted)}
.dot{width:12px;height:12px;border-radius:50%;flex:none}
.seg{display:inline-flex;border:1.5px solid var(--line);border-radius:10px;overflow:hidden;background:var(--card)}
.seg button{border:0;background:transparent;color:var(--ink);padding:0 14px;min-height:44px;font-weight:700;cursor:pointer;border-left:1px solid var(--line)}
.seg button:first-child{border-left:0}
.seg button[aria-pressed=true]{background:var(--brand);color:var(--on-brand)}
.filters{display:flex;gap:.6rem;flex-wrap:wrap;margin-bottom:14px}.filters>*{flex:1 1 150px}.filters .seg{flex:0 0 auto}
/* banners */
.banner{padding:10px 16px;display:flex;gap:.75rem;align-items:center;justify-content:center;flex-wrap:wrap;font-weight:700;font-size:.92rem;text-align:center}
.banner.trial{background:var(--brand-soft);color:var(--brand-ink)}.banner.warn{background:var(--warn-soft);color:var(--warn)}.banner.bad{background:var(--bad-soft);color:var(--bad)}
.banner .btn{min-height:36px}
.notice-ok{background:var(--ok-soft);color:var(--ok);padding:12px 14px;border-radius:10px;font-weight:700;margin-bottom:14px}
/* empty/skeleton */
.empty{text-align:center;padding:28px 16px;color:var(--muted)}.empty h3{color:var(--ink);margin-bottom:4px}.empty .btn{margin-top:10px}
.sk{border-radius:10px;background:linear-gradient(90deg,var(--line) 25%,transparent 50%,var(--line) 75%);background-size:300% 100%;animation:sk 1.3s infinite linear;height:72px;opacity:.6}
.sk.s{height:24px;width:50%}
@keyframes sk{from{background-position:100% 0}to{background-position:0 0}}
@media(prefers-reduced-motion:reduce){.sk{animation:none}}
/* toasts */
#toasts{position:fixed;left:12px;right:12px;bottom:calc(var(--tabs) + 12px);display:grid;gap:8px;z-index:100;pointer-events:none;justify-items:center}
@media(min-width:900px){#toasts{bottom:20px;left:auto;right:20px;justify-items:end}}
.toast{background:var(--ink);color:var(--bg);padding:12px 16px;border-radius:10px;font-weight:700;box-shadow:var(--shadow);max-width:420px;pointer-events:auto}
.toast.err{background:var(--bad);color:#fff}
/* dialog */
dialog{border:0;border-radius:16px;padding:20px;max-width:min(480px,calc(100vw - 24px));width:100%;background:var(--card);color:var(--ink);box-shadow:0 10px 40px rgba(0,0,0,.3)}
dialog::backdrop{background:rgba(10,15,20,.5)}
dialog h2{margin-bottom:.5rem}dialog .actions{display:flex;gap:.6rem;justify-content:flex-end;margin-top:16px;flex-wrap:wrap}
/* sessions */
.sess{display:flex;gap:.8rem;align-items:stretch;border-left:6px solid var(--c,var(--brand));padding:14px;border-radius:12px;background:var(--card);border-top:1px solid var(--line);border-right:1px solid var(--line);border-bottom:1px solid var(--line);box-shadow:var(--shadow)}
.sess .time{font-weight:800;font-size:1.1rem}
.sess.cancelled{opacity:.7}.sess.cancelled .time,.sess.cancelled h3{text-decoration:line-through}
.sess .acts{display:flex;align-items:center}
/* attendance */
.stu{display:grid;gap:8px;padding:12px 0;border-top:1px solid var(--line)}
.stu:first-child{border-top:0}
.stu .seg{width:100%}.stu .seg button{flex:1;padding:0 4px;font-size:.88rem}
.stu .seg button[aria-pressed=true].s-present{background:var(--ok);}
.stu .seg button[aria-pressed=true].s-absent{background:var(--bad);color:#fff}
.stu .seg button[aria-pressed=true].s-late{background:var(--warn);color:#fff}
.stu .seg button[aria-pressed=true].s-excused{background:var(--muted);color:#fff}
.stickybar{position:sticky;bottom:calc(var(--tabs) + 8px);background:var(--card);border:1px solid var(--line);border-radius:14px;padding:12px;box-shadow:var(--shadow);display:grid;gap:10px;margin-top:14px}
@media(min-width:900px){.stickybar{bottom:12px}}
/* week */
.week{display:grid;gap:12px}
@media(min-width:900px){.week{grid-template-columns:repeat(7,1fr);gap:8px}}
.day{min-width:0}.day h3{font-size:.9rem;margin-bottom:6px}.day.today h3{color:var(--brand-ink)}
.day .cell{display:block;text-decoration:none;color:var(--ink);border-left:5px solid var(--c,var(--brand));background:var(--card);border-radius:8px;padding:8px 10px;margin-bottom:6px;border-top:1px solid var(--line);border-right:1px solid var(--line);border-bottom:1px solid var(--line);font-size:.85rem}
.day .cell b{display:block}.day .cell.cancelled{opacity:.65;text-decoration:line-through}
.day .none{color:var(--muted);font-size:.85rem}
/* slots editor */
.slot{display:grid;grid-template-columns:1fr 1fr 1fr auto;gap:8px;align-items:end}
@media(max-width:520px){.slot{grid-template-columns:1fr 1fr}.slot select{grid-column:1/-1}}
table.t{width:100%;border-collapse:collapse}table.t td,table.t th{padding:10px 8px;border-top:1px solid var(--line);text-align:left;vertical-align:middle}
.swatches{display:flex;gap:8px;flex-wrap:wrap}.swatches label{position:relative}.swatches input{position:absolute;opacity:0}
.swatches span{display:block;width:44px;height:44px;border-radius:50%;border:3px solid transparent;background:var(--c)}
.swatches input:checked+span{border-color:var(--ink)}.swatches input:focus-visible+span{outline:3px solid var(--accent);outline-offset:2px}
.copybox{display:flex;gap:.5rem;flex-wrap:wrap}.copybox input{flex:1 1 220px}
.steps li{margin-bottom:.4rem}.steps li.done{text-decoration:line-through;color:var(--muted)}
/* auth */
#auth{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px}
.authbox{width:100%;max-width:440px}.authbox .logo{justify-content:center;margin-bottom:18px;font-size:1.5rem;display:flex}
.plans{display:grid;gap:8px}.plans label{display:flex;gap:.7rem;align-items:center;border:1.5px solid var(--line);border-radius:10px;padding:10px 12px;min-height:56px;cursor:pointer;background:var(--card)}
.plans label:has(input:checked){border-color:var(--brand);background:var(--brand-soft)}.plans input{accent-color:var(--brand);width:20px;height:20px}
.plans b{display:block}.plans small{color:var(--muted)}.plans .price{margin-left:auto;font-weight:800;white-space:nowrap}
.danger-zone{border-color:var(--bad)}

@media(min-width:900px){.day h3{min-height:2.6em}}

/* soporte */
.navbadge{display:inline-flex;align-items:center;justify-content:center;min-width:18px;height:18px;padding:0 5px;border-radius:99px;background:var(--bad);color:#fff;font-size:.7rem;font-weight:800;line-height:1}
.tabs a{position:relative}.tabs a .navbadge{position:absolute;top:4px;left:calc(50% + 6px)}
.side a.nav .navbadge{margin-left:auto}
.pip{display:inline-block;width:9px;height:9px;border-radius:50%;background:var(--bad);margin-right:7px;vertical-align:middle}
a.tk{display:grid;gap:2px;min-height:44px;align-content:center}.tk-sub{overflow-wrap:anywhere}.tk.unread .tk-sub{font-weight:800}
.faq{border-top:1px solid var(--line)}.faq:first-child{border-top:0}
.faq summary{cursor:pointer;font-weight:700;padding:12px 28px 12px 0;min-height:44px;list-style:none;position:relative;display:flex;align-items:center}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"";position:absolute;right:6px;top:50%;width:8px;height:8px;border-right:2px solid var(--muted);border-bottom:2px solid var(--muted);transform:translateY(-70%) rotate(45deg);transition:transform .15s}
.faq[open] summary::after{transform:translateY(-30%) rotate(-135deg)}
.faq-body{padding:0 0 12px;color:var(--ink)}.faq-body p{margin:0 0 .7em}.faq-body ol,.faq-body ul{margin:0 0 .8em;padding-left:1.3rem}.faq-body li{margin-bottom:.35rem}
.chat{display:grid;gap:10px;margin-bottom:14px}
.bubble{max-width:min(560px,92%);padding:10px 14px;border-radius:14px;background:var(--card);border:1px solid var(--line);justify-self:start}
.bubble.support{background:var(--brand-soft);border-color:transparent}
.bubble.mine{justify-self:end;background:var(--brand);color:var(--on-brand);border-color:transparent}
.bubble.mine .muted{color:inherit;opacity:.8}
.bubble.support.mine{background:var(--brand-soft);color:var(--ink)}.bubble.support.mine .muted{color:var(--muted);opacity:1}
.bubble .who{display:flex;gap:.6rem;align-items:baseline;flex-wrap:wrap;margin-bottom:2px;font-size:.88rem}
.bubble .txt{white-space:pre-wrap;overflow-wrap:anywhere}
.thumbs{display:flex;gap:8px;flex-wrap:wrap;margin-top:8px}
.thumb img{display:block;max-width:160px;max-height:120px;border-radius:8px;border:1px solid var(--line);background:#fff;object-fit:cover}
.attach{display:flex;gap:12px;align-items:center;flex-wrap:wrap}
.attach-btn{cursor:pointer}.attach-btn:focus-within{outline:3px solid var(--accent);outline-offset:2px}
.preview{display:flex;gap:10px;align-items:center}.preview img{max-height:72px;max-width:120px;border-radius:8px;border:1px solid var(--line)}
[hidden]{display:none!important}
.tk-meta{display:flex;gap:6px;align-items:center;flex-wrap:wrap;margin-top:2px}

/* i18n: selector de idioma en pantallas de acceso y ajustes de textos largos (alemán) */
.langs{display:flex;flex-wrap:wrap;justify-content:center;gap:0 6px;margin:14px 0 0}
.langs button{background:none;border:0;color:var(--muted);cursor:pointer;padding:0 8px;min-height:44px;font:inherit}
.langs button[aria-current=true]{color:var(--brand-ink);font-weight:800;text-decoration:underline}
.btn{overflow-wrap:anywhere;hyphens:auto}
.seg button{overflow-wrap:anywhere}
.tabs a span{overflow:hidden;text-overflow:ellipsis;max-width:100%}

/* clases: aviso informativo (clase futura, lista ya pasada…), lista bloqueada y diálogos de calendario/grupos */
.callout{padding:10px 12px;border-radius:10px;background:var(--brand-soft);color:var(--brand-ink);font-weight:700;margin:0}
.callout.warn{background:var(--warn-soft);color:var(--warn)}
.stu-locked .seg{opacity:.55}.stu-locked .seg button{cursor:not-allowed}
.clashes{margin:.4rem 0 0;padding-left:1.2rem}.clashes li{margin-bottom:.35rem;overflow-wrap:anywhere}
dialog .err{margin-top:10px}
/* reserva la línea de estado del tema/deberes: al perder el foco aparece «Guardando…» y no debe desplazar los botones de debajo */
.class-log [data-log-status]{min-height:1.4em;margin-top:4px}
.day .cell .cell-topic{display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;overflow-wrap:anywhere;text-decoration:inherit}