:root{
  --bg:#f5f7fb; --card:#fff; --ink:#172033; --muted:#6c7484;
  --line:#e7ebf2; --primary:#4f7cff; --success:#2ca36b; --danger:#d95f5f;
  --shadow:0 12px 32px rgba(27,39,75,.08); --radius:20px;
}
*{box-sizing:border-box}
body{margin:0;font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--ink)}
button,select,input{font:inherit}
button{cursor:pointer}
.app{max-width:1220px;margin:auto;padding:18px}
.topbar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:16px}
.brand h1{margin:0;font-size:26px}.brand p{margin:4px 0 0;color:var(--muted);font-size:14px}
.avatar{width:48px;height:48px;border-radius:50%;display:grid;place-items:center;background:white;box-shadow:var(--shadow);font-size:24px}
.tabs{display:flex;gap:8px;overflow:auto;padding-bottom:4px;margin-bottom:16px}
.tab{border:0;padding:10px 14px;border-radius:999px;background:#e9edf5;color:var(--ink);white-space:nowrap}
.tab.active{background:var(--ink);color:white}
.view{display:none}.view.active{display:block}
.card{background:var(--card);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.hero{display:grid;grid-template-columns:1.35fr .75fr;gap:16px}
.hero-main{background:linear-gradient(135deg,#213a62,#4f7cff);color:white;min-height:230px;display:flex;flex-direction:column;justify-content:space-between}
.hero-main p{color:#e8efff;max-width:760px}
.btn{border:0;border-radius:12px;padding:11px 14px;background:var(--ink);color:#fff;font-weight:700}
.btn.secondary{background:#edf2ff;color:#24395e}.btn.ghost{background:white;color:var(--ink);border:1px solid var(--line)}
.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}
.stat{background:#f6f8fc;border-radius:14px;padding:13px;text-align:center}.stat strong{display:block;font-size:23px}
.subject-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:16px}
.subject-card{cursor:pointer;border:2px solid transparent}.subject-card:hover{border-color:#d9e2ff;transform:translateY(-1px)}
.subject-card .icon{font-size:31px}.subject-card h3{margin:8px 0 5px}.subject-card p{margin:0;color:var(--muted);font-size:13px}
.day-controls{display:flex;gap:10px;align-items:center;flex-wrap:wrap;margin-bottom:12px}
select{padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:#fff}
.plan{display:grid;gap:9px}
.plan-row{display:flex;align-items:center;gap:12px;background:#f7f9fc;padding:12px;border-radius:14px}
.plan-row .icon{font-size:28px}.plan-row .meta{flex:1}.plan-row .meta b{display:block}.plan-row .meta span{font-size:12px;color:var(--muted)}
.activity-grid{display:grid;grid-template-columns:270px 1fr;gap:14px}
.sidebar{display:grid;gap:8px;align-content:start}
.subject-btn{border:0;padding:11px;border-radius:12px;background:#f0f3f8;text-align:left}
.subject-btn.active{background:#dde7ff}
.progress{height:10px;background:#edf0f5;border-radius:999px;overflow:hidden;margin:10px 0 16px}.progress>div{height:100%;background:var(--success)}
.question-wrap{border:1px solid var(--line);border-radius:18px;padding:18px;background:white}
.qtop{display:flex;justify-content:space-between;gap:8px;align-items:center}
.qtop .counter{font-size:13px;color:var(--muted)}
.voice{border:0;background:#edf2ff;color:#24395e;border-radius:10px;padding:9px 11px}
.visual{display:grid;place-items:center;min-height:130px;margin:10px 0;font-size:38px}
.visual svg{max-width:280px;width:100%;height:160px}
.question{font-size:23px;font-weight:800;margin:10px 0 14px}
.options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.option{border:2px solid var(--line);border-radius:14px;padding:15px;background:#fff;min-height:58px}
.option.correct{border-color:#50aa7d;background:#eaf8f1}.option.wrong{border-color:#dc7a7a;background:#fff0f0}
.feedback{min-height:28px;font-weight:700;margin:12px 0}
.calendar{display:grid;grid-template-columns:repeat(4,1fr);gap:10px}
.day-card{background:#f7f9fc;border-radius:14px;padding:13px;border:2px solid transparent}.day-card.today{border-color:var(--primary)}.day-card.done{border-color:#bde7d0}
.pills{display:flex;flex-wrap:wrap;gap:4px;margin-top:8px}.pill{font-size:11px;padding:4px 7px;border-radius:999px;background:#e9edf5}
.parent-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}
table{width:100%;border-collapse:collapse}th,td{padding:10px;border-bottom:1px solid var(--line);text-align:left}
.note{background:#fff8e9;border:1px solid #f0deb2;padding:12px;border-radius:14px}
.footer{padding:24px 0;text-align:center;color:var(--muted);font-size:12px}
@media(max-width:850px){.hero,.activity-grid,.parent-grid{grid-template-columns:1fr}.subject-grid{grid-template-columns:1fr 1fr}.calendar{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.app{padding:12px}.subject-grid,.calendar,.options,.stats{grid-template-columns:1fr}.brand h1{font-size:22px}}