:root{
  --bg:#f7f5f0; --card:#ffffff; --ink:#1d1d1f; --muted:#6b6b70; --line:#e6e2d9;
  --blue:#1f3a93; --red:#c8102e; --gold:#b9892e; --green:#2e7d4f;
  --radius:14px; --shadow:0 6px 24px rgba(20,20,40,.06);
}
@media (prefers-color-scheme: dark){
  :root:not([data-theme="light"]){
    --bg:#121317; --card:#1b1d23; --ink:#f2f2f4; --muted:#a4a6ae; --line:#2b2e37; --shadow:0 6px 24px rgba(0,0,0,.4);
  }
}
*{box-sizing:border-box}
html,body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,system-ui,sans-serif;line-height:1.55}
h1,h2,h3{font-family:Fraunces,Georgia,serif;letter-spacing:-.01em;margin:.2em 0 .4em}
h1{font-size:2rem}h2{font-size:1.45rem}h3{font-size:1.1rem}
a{color:var(--blue)}
.container{max-width:880px;margin:0 auto;padding:24px 16px 80px}
.topbar{position:sticky;top:0;z-index:5;display:flex;justify-content:space-between;align-items:center;padding:12px 16px;background:var(--card);border-bottom:1px solid var(--line)}
.brand{display:flex;align-items:center;gap:10px;font-family:Fraunces,serif;font-weight:700;font-size:1.3rem;color:var(--ink);text-decoration:none}
.flag{display:inline-flex;width:30px;height:20px;border-radius:4px;overflow:hidden;border:1px solid var(--line)}
.flag i{flex:1}.flag i:nth-child(1){background:#1f3a93}.flag i:nth-child(2){background:#fff}.flag i:nth-child(3){background:#c8102e}
.nav{display:flex;gap:14px;align-items:center}
.nav a{text-decoration:none;color:var(--ink);font-weight:500}
.footer{display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px;padding:16px;color:var(--muted);font-size:.85rem;border-top:1px solid var(--line)}
.badge{padding:2px 10px;border-radius:999px;background:var(--line);font-size:.75rem}
.muted{color:var(--muted)}
.btn{border:1px solid var(--line);background:var(--card);color:var(--ink);padding:9px 16px;border-radius:10px;font:inherit;font-weight:600;cursor:pointer}
.btn-primary{background:var(--blue);border-color:var(--blue);color:#fff}
.btn-ghost{background:transparent}
.btn:disabled{opacity:.5;cursor:not-allowed}
.link{background:none;border:0;color:var(--blue);cursor:pointer;font:inherit;padding:0}
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:20px;margin-bottom:16px}
.hero{display:grid;gap:12px;padding:28px 20px;border-radius:var(--radius);background:linear-gradient(135deg,var(--blue),#2d55c7);color:#fff;margin-bottom:22px}
.hero h1{color:#fff;margin:0}
.hero p{margin:0;opacity:.92}
.levels{display:grid;gap:14px}
.level-head{display:flex;justify-content:space-between;align-items:baseline;gap:8px}
.level-tag{display:inline-block;font-weight:700;font-family:Fraunces,serif;font-size:1.3rem;color:var(--red)}
.lessons{display:grid;gap:8px;margin-top:10px}
.lesson-row{display:flex;align-items:center;gap:12px;padding:10px 12px;border:1px solid var(--line);border-radius:10px;text-decoration:none;color:var(--ink);background:var(--bg)}
.lesson-row:hover{border-color:var(--blue)}
.lesson-row.locked{opacity:.55;pointer-events:none}
.lesson-row .num{width:28px;height:28px;border-radius:50%;display:grid;place-items:center;background:var(--line);font-size:.8rem;font-weight:600;flex:none}
.lesson-row.done .num{background:var(--green);color:#fff}
.lesson-row .score{margin-left:auto;font-size:.8rem;color:var(--muted)}
.progress-bar{height:8px;background:var(--line);border-radius:999px;overflow:hidden}
.progress-bar span{display:block;height:100%;background:var(--green)}
.section-title{display:flex;align-items:center;gap:10px;margin-top:6px}
.section-title .ico{width:30px;height:30px;border-radius:8px;display:grid;place-items:center;background:var(--bg);border:1px solid var(--line);font-size:.95rem}
table{width:100%;border-collapse:collapse;margin:6px 0}
td,th{padding:8px 6px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;font-size:.95rem}
th{font-size:.8rem;text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
.fr{font-weight:600}
.speak{border:0;background:var(--bg);border:1px solid var(--line);border-radius:6px;cursor:pointer;padding:1px 7px;font-size:.85rem;margin-left:6px;vertical-align:middle}
.speak:hover{border-color:var(--blue)}
.note{font-size:.85rem;color:var(--muted)}
.dialogue p{margin:6px 0;padding:8px 12px;border-radius:10px;background:var(--bg)}
.dialogue .who{font-weight:700;color:var(--red);margin-right:6px}
.dialogue .pt{display:block;color:var(--muted);font-size:.85rem}
.gram{background:var(--bg);border-left:4px solid var(--gold);padding:12px 14px;border-radius:0 10px 10px 0}
.gram ul{margin:.4em 0;padding-left:1.2em}
.exercise{padding:14px;border:1px solid var(--line);border-radius:10px;margin-bottom:12px}
.exercise .q{font-weight:600;margin-bottom:8px}
.options{display:grid;gap:6px}
.options label{display:flex;gap:8px;align-items:flex-start;padding:8px 10px;border:1px solid var(--line);border-radius:8px;cursor:pointer}
.options label:has(input:checked){border-color:var(--blue);background:rgba(31,58,147,.06)}
input[type=text],input[type=email],input[type=password],textarea{width:100%;padding:9px 11px;border:1px solid var(--line);border-radius:8px;font:inherit;background:var(--bg);color:var(--ink)}
label{display:block;margin-bottom:10px;font-size:.9rem}
label input{margin-top:4px}
.feedback{margin-top:8px;font-size:.9rem;padding:8px 10px;border-radius:8px}
.feedback.ok{background:rgba(46,125,79,.12);color:var(--green)}
.feedback.ko{background:rgba(200,16,46,.1);color:var(--red)}
.result{text-align:center;padding:20px}
.result .big{font-size:2.6rem;font-family:Fraunces,serif;font-weight:700}
.row{display:flex;gap:10px;flex-wrap:wrap;align-items:center}
.pager{display:flex;justify-content:space-between;margin-top:20px;gap:10px;flex-wrap:wrap}
.error{color:var(--red);font-size:.85rem;min-height:1em}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.45);display:grid;place-items:center;z-index:20;padding:16px}
.modal.hidden{display:none}
.modal-card{position:relative;background:var(--card);border-radius:var(--radius);padding:24px;width:100%;max-width:400px}
.modal-close{position:absolute;right:12px;top:8px;background:none;border:0;font-size:1.5rem;cursor:pointer;color:var(--muted)}
.auth-links{display:flex;justify-content:space-between;margin-top:12px}
.chip{display:inline-block;padding:2px 8px;border-radius:6px;background:var(--bg);border:1px solid var(--line);font-size:.8rem;margin-right:4px}
.challenge{border:2px dashed var(--gold);padding:14px;border-radius:10px;background:rgba(185,137,46,.06)}
@media (max-width:600px){h1{font-size:1.6rem}.nav a{display:none}}