*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);font:16px/1.55 var(--font)}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.5}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #c78e26;outline-offset:4px}.skip{position:fixed;top:-100px;left:12px;background:white;z-index:20;padding:12px}.skip:focus{top:10px}.shell{display:grid;grid-template-columns:238px minmax(0,1fr);min-height:100vh}.sidebar{padding:32px 22px;background:#fcfcf8;border-right:1px solid var(--line);display:flex;flex-direction:column;position:sticky;top:0;height:100vh}.brand{display:flex;gap:11px;align-items:center;font-weight:700;font-size:17px;line-height:1.2;letter-spacing:-.4px}.brand-mark{font-size:38px;font-weight:300;color:var(--green)}.brand small{display:block;font-size:9px;letter-spacing:2px;margin-top:7px;font-weight:500}.workspace{margin:42px 13px 12px;font-size:10px;text-transform:uppercase;letter-spacing:1.6px;color:var(--muted)}.nav{display:grid;gap:8px}.nav a{display:flex;gap:13px;padding:12px 14px;border-radius:11px;font-size:14px}.nav a.active{background:var(--mint);color:var(--green);font-weight:650}.nav-icon{width:20px;text-align:center}.side-bottom{margin-top:auto;padding-top:30px}.side-note{background:#edf1e9;border-radius:15px;padding:18px;font-size:12px;color:var(--muted)}.side-note strong{display:block;color:var(--green);font-size:13px;margin-bottom:5px}.profile{margin-top:24px;display:flex;gap:10px;align-items:center;font-size:13px}.avatar{background:#e8dfc5;width:36px;height:36px;border-radius:50%;display:grid;place-items:center;color:#665735;font-size:12px}.profile small{display:block;color:var(--muted);font-size:11px}.main-wrap{min-width:0}.topbar{height:82px;border-bottom:1px solid var(--line);padding:0 44px;display:flex;align-items:center;justify-content:space-between;gap:15px;background:#fafbf6}.crumb{font-size:13px;color:var(--muted)}.role-switch{display:flex;background:#e9eee7;border-radius:9px;padding:4px}.role-switch a{font-size:12px;padding:7px 14px;border-radius:6px}.role-switch .active{background:white;box-shadow:0 2px 5px #0000000a;color:var(--green)}.demo-strip{padding:8px 44px;border-bottom:1px solid #e1d9c2;background:#f4f0e2;color:#746845;font-size:11px}main{max-width:1440px;margin:auto;padding:36px 44px 60px;outline:none}.eyebrow{font-size:10px;letter-spacing:2px;text-transform:uppercase;color:var(--muted);font-weight:650;margin:0 0 10px}h1{font-size:34px;line-height:1.2;font-weight:600;letter-spacing:-1px;margin:0 0 12px}h2{font-size:21px;line-height:1.3;font-weight:600;letter-spacing:-.4px;margin:0 0 12px}h3{font-size:17px;line-height:1.35;margin:0 0 10px}.muted{color:var(--muted)}p{margin:0 0 16px}.page-head{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:28px}.page-head p{font-size:14px;margin:0;color:var(--muted)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:44px;padding:11px 18px;background:var(--green);color:white;border:1px solid transparent;border-radius:10px;font-weight:600;font-size:13px;white-space:normal;text-align:center}.btn:hover{filter:brightness(1.08)}.btn.secondary{background:white;border-color:var(--line);color:var(--ink)}.btn.light{background:#f5f2e3;color:#243c3e}.btn.ghost{background:transparent;color:var(--green);border-color:var(--line)}.actions{display:flex;gap:10px;flex-wrap:wrap}.hero{background:var(--night);color:#f8f8ee;border-radius:var(--radius);padding:32px;display:grid;grid-template-columns:1.2fr 1fr;gap:24px;overflow:hidden;position:relative}.hero h2{font-size:31px;max-width:430px;font-weight:500;line-height:1.2;margin:12px 0 15px}.hero p{color:#bed0cd;font-size:14px;max-width:420px}.hero .eyebrow{color:#aec7c0}.hero-art{border:1px dashed #648479;border-radius:16px;min-height:220px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px;color:#bbcebd;background:radial-gradient(ellipse at center,#31504c66,transparent 70%);font-size:12px;text-align:center;padding:20px}.hero-art .orbit{font-size:64px;line-height:1;color:var(--gold);font-weight:200}.hero-art small{color:#8ea99d;font-size:10px;letter-spacing:1px}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:22px 0 30px}.stat{padding:20px 24px;background:white;border:1px solid var(--line);border-radius:14px;display:flex;align-items:center;gap:15px}.stat b{font-size:28px;font-weight:500}.stat span{font-size:12px;color:var(--muted)}.section-head{display:flex;justify-content:space-between;align-items:center;gap:20px;margin:30px 0 16px}.section-head h2{margin:0}.text-link{font-size:12px;color:var(--green);font-weight:600;padding:8px 0}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.card{background:white;border:1px solid var(--line);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow);min-width:0}.card .meta{font-size:12px;color:var(--muted);margin:12px 0 20px}.tag{display:inline-flex;align-items:center;gap:6px;padding:4px 9px;border-radius:6px;background:var(--mint);color:#466450;font-size:10px;font-weight:600;letter-spacing:.2px}.tag.gold{background:#f1ead8;color:#806b39}.card-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:20px}.unit-num{font-size:27px;color:#bdc8bf;font-weight:300}.skill-row{display:flex;gap:7px;flex-wrap:wrap;margin:14px 0}.skill{font-size:10px;padding:3px 8px;border:1px solid var(--line);border-radius:30px;color:var(--muted)}.card p{font-size:13px;color:var(--muted)}.card-footer{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:24px;border-top:1px solid var(--line);padding-top:16px}.card-footer span{font-size:11px;color:var(--muted)}.card .btn{font-size:12px;padding:9px 13px}.layout-two{display:grid;grid-template-columns:minmax(0,1.65fr) minmax(260px,1fr);gap:22px}.panel{padding:25px;border:1px solid var(--line);background:white;border-radius:var(--radius)}.panel p{font-size:14px}.empty{padding:30px;text-align:center;border:1px dashed #bdc9bf;border-radius:14px;background:#fafbf6;color:var(--muted)}.empty h3{color:var(--ink)}.empty p{font-size:13px}.filters{display:flex;gap:12px;margin-bottom:24px;flex-wrap:wrap}.filters input{flex:1;min-width:180px}.filters select{max-width:220px}input,select{background:white;border:1px solid #c9d4cb;border-radius:9px;padding:11px 12px;min-height:44px;max-width:100%;color:var(--ink)}label{display:block;font-size:13px;font-weight:600;margin:0 0 8px}.field{margin-bottom:20px}.field input,.field select{width:100%}.help{font-size:12px;color:var(--muted);margin-top:6px}.notice{background:#f5f0df;border:1px solid #e8ddbc;border-radius:11px;padding:14px 16px;font-size:12px;color:#76613b;margin:18px 0}.assignment-row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 0;border-bottom:1px solid var(--line)}.assignment-row:last-child{border:0}.assignment-row h3{font-size:15px;margin:0 0 5px}.assignment-row small{color:var(--muted)}.code{letter-spacing:2px;font:600 22px/1.5 monospace;background:var(--mint);padding:12px 18px;border-radius:9px;display:inline-block}.table-wrap{overflow-x:auto}table{border-collapse:collapse;width:100%;font-size:13px}th{text-align:left;font-size:11px;color:var(--muted);font-weight:500;padding:14px;border-bottom:1px solid var(--line);white-space:nowrap}td{padding:17px 14px;border-bottom:1px solid var(--line)}.review{border-bottom:1px solid var(--line);padding:18px 0}.review p{margin:7px 0;font-size:13px}.good{color:#286249}.bad{color:#a14034}.lesson-shell{max-width:820px;margin:auto}.lesson-header{display:flex;justify-content:space-between;align-items:center;font-size:12px;color:var(--muted);margin-bottom:16px}.progress{height:5px;background:#dfe6de;border-radius:10px;margin-bottom:28px;overflow:hidden}.progress div{height:100%;background:var(--green)}.question{padding:34px;background:white;border:1px solid var(--line);border-radius:20px}.question h2{font-size:27px;margin:18px 0 24px}.answers{display:grid;gap:12px}.answer{display:flex;align-items:center;gap:13px;padding:15px;border:1px solid var(--line);border-radius:10px;font-weight:400;font-size:15px;margin:0;cursor:pointer}.answer:has(input:checked){border-color:var(--green);background:var(--mint)}.answer input{min-height:auto;accent-color:var(--green);width:17px;height:17px}.question-footer{display:flex;justify-content:space-between;gap:12px;margin-top:24px}.feedback{margin-top:18px;border-radius:10px;padding:16px;background:#eef3ec;font-size:14px}.score{font-size:60px;letter-spacing:-3px;font-weight:500;color:var(--green)}.map-surface{background:var(--night);border-radius:20px;padding:35px;color:white;min-height:360px}.map-surface p{color:#bed0cd;font-size:14px}.constellation{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px;margin:28px 0}.star-card{min-height:160px;border:1px solid #49626a;border-radius:14px;padding:20px;text-align:center;display:flex;flex-direction:column;align-items:center;justify-content:center;background:#ffffff03}.star-card .star{font-size:42px;color:#a6baba}.star-card.lit .star{color:#ead28f;text-shadow:0 0 22px #ead28f77}.star-card b{font-size:13px}.star-card small{font-size:10px;color:#abc1c3;margin-top:7px}.media-slot{border:1px dashed #bdcbbf;background:#f0f3ec;border-radius:13px;padding:24px;text-align:center;color:var(--muted);font-size:12px;min-height:130px;display:grid;place-content:center;margin-top:20px}.media-slot strong{font-weight:500;display:block;color:var(--ink);margin-bottom:4px}.mobile-brand{display:none}#toast{position:fixed;bottom:24px;left:50%;transform:translateX(-50%);z-index:100;background:var(--night);color:white;border-radius:12px;padding:14px 22px;max-width:90vw;box-shadow:var(--shadow);font-size:13px;display:none}#toast.show{display:block}.footer{font-size:10px;color:var(--muted);margin-top:38px;display:flex;justify-content:space-between;gap:15px}.subtle-list{padding:0;list-style:none;font-size:13px}.subtle-list li{padding:13px 0;border-bottom:1px solid var(--line)}.subtle-list span{color:var(--muted)}.number-chip{width:32px;height:32px;display:inline-grid;place-items:center;border-radius:50%;background:var(--mint);margin-right:10px}.full{width:100%}.split{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.error{color:var(--danger);font-size:13px}.future{box-shadow:none;background:#f9faf5}.future .unit-num{color:#a3b1a6}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0)}@media(min-width:1500px){main{padding-top:45px}.hero{padding:38px}.hero-art{min-height:245px}}@media(max-width:1100px){.shell{grid-template-columns:195px minmax(0,1fr)}.sidebar{padding:26px 15px}.brand{font-size:14px}.topbar{padding:0 26px}main{padding:28px 26px 50px}.demo-strip{padding:8px 26px}.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hero{grid-template-columns:1fr .8fr}.hero h2{font-size:27px}.layout-two{grid-template-columns:1fr}.stats{gap:10px}.stat{padding:16px}}@media(max-width:720px){.shell{display:block}.sidebar{position:static;width:100%;height:auto;padding:16px 18px;border-right:0;border-bottom:1px solid var(--line)}.brand{font-size:16px}.brand-mark{font-size:31px}.brand small{font-size:8px}.workspace,.side-bottom{display:none}.nav{display:flex;gap:4px;margin-top:17px;overflow-x:auto}.nav a{padding:10px 12px;white-space:nowrap;font-size:12px}.nav-icon{display:none}.topbar{height:58px;padding:0 18px}.crumb{font-size:11px}.role-switch a{padding:7px 10px;font-size:11px}.demo-strip{padding:8px 18px;font-size:10px}main{padding:25px 18px 40px}h1{font-size:28px}.page-head{align-items:flex-start;gap:14px;flex-direction:column;margin-bottom:22px}.page-head .btn{width:100%}.hero{grid-template-columns:1fr;padding:25px;gap:16px}.hero h2{font-size:29px}.hero-art{min-height:140px}.hero-art .orbit{font-size:42px}.stats{gap:8px;margin-top:16px}.stat{display:block;padding:13px 11px;border-radius:11px}.stat b{font-size:24px;display:block}.stat span{font-size:10px}.grid{grid-template-columns:1fr;gap:14px}.card{padding:22px}.section-head{align-items:baseline}.section-head h2{font-size:20px}.panel{padding:20px}.question{padding:22px}.question h2{font-size:24px}.constellation{grid-template-columns:1fr;gap:12px}.star-card{min-height:105px;display:grid;grid-template-columns:65px 1fr;text-align:left;justify-items:start}.star-card .star{grid-row:span 2}.map-surface{padding:24px}.filters{gap:8px}.filters select{max-width:none;flex:1}.assignment-row{align-items:flex-start;flex-direction:column}.question-footer .btn{padding:10px 13px}.footer{font-size:9px}.lesson-header{font-size:10px}.hero .btn{width:100%}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation:none!important;transition:none!important}}

/* Long sections stay compact; keyboard-accessible native disclosure. */
.unit-lessons { margin-top:20px; }
.unit-lessons summary { cursor:pointer; color:var(--ink); font-weight:700; padding:12px 0; }
.unit-lessons summary:focus-visible { outline:2px solid var(--green); outline-offset:4px; }
.unit-lessons .card-footer { margin-top:12px; }
textarea { font:inherit; color:var(--ink); background:var(--white); border:1px solid #c9d4cb; border-radius:9px; padding:12px; resize:vertical; }
textarea:focus-visible, summary:focus-visible { outline:3px solid #c78e26; outline-offset:4px; }
.card-footer > div, .assignment-row > div { min-width:0; }
h1, h2, h3, .card-footer strong, .review, .answer span { overflow-wrap:anywhere; }
@media(max-width:420px) { .topbar { height:auto; min-height:58px; flex-wrap:wrap; padding-top:10px; padding-bottom:10px; } .lesson-header { gap:10px; flex-wrap:wrap; } }

/* Wide lesson images: preserve the complete picture on phones and desktops. */
.lesson-illustration{width:100%;margin:20px 0;aspect-ratio:16/9;background:#eef1e9;border-radius:16px;overflow:hidden}
.lesson-illustration img{display:block;width:100%;height:100%;object-fit:contain}

/* Independent irregular verb trainer */
.verb-map-link{display:block;color:#bfe3d4;margin:10px 0;font-size:14px;text-decoration:underline}
.verb-controls{display:flex;flex-wrap:wrap;gap:14px;margin:18px 0;align-items:end}.verb-controls label{display:flex;flex:1 1 160px;flex-direction:column;gap:8px;min-width:0}.verb-controls input,.verb-controls select{width:100%;min-width:0}
.verb-list{margin:20px 0;display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,250px),1fr));gap:10px;max-height:480px;overflow:auto;padding:2px}
.verb-row{display:flex;align-items:start;gap:12px;padding:14px;border:1px solid var(--line,#d8dfda);border-radius:12px;cursor:pointer}.verb-row input{width:20px;height:20px;flex-shrink:0;margin-top:4px}.verb-row span{min-width:0}.verb-row strong,.verb-row small,.verb-translation{display:block}.verb-translation{font-size:13px;margin:4px 0}.verb-state{font-size:11px;color:var(--muted);margin-left:auto}
.verb-forms{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:24px 0}.verb-forms>div{background:#eef1e9;border-radius:14px;padding:16px;display:flex;flex-direction:column;gap:14px}.verb-forms strong{font-size:25px;overflow-wrap:anywhere}.verb-forms small{color:var(--muted)}.verb-word{font-size:44px;margin:24px 0 0}.verb-speech{margin-top:20px}.verb-trainer .actions{flex-wrap:wrap}
@media(max-width:600px){.verb-forms{grid-template-columns:1fr}.verb-controls{display:grid;grid-template-columns:1fr}.verb-word{font-size:36px}.verb-row{padding:12px}}

@media(max-width:720px){.star-card.grammar-card .verb-map-link,.star-card.grammar-card small{grid-column:2}.star-card.grammar-card .star{grid-column:1;grid-row:1 / span 4}}