*{box-sizing:border-box}
:root{
  --bg:#f4f7fb;--surface:#fff;--ink:#172033;--muted:#667085;--line:#dfe6ef;
  --blue:#2563eb;--violet:#6d4aff;--green:#168a52;--amber:#9a6400;--red:#b42318
}
body{margin:0;font-family:Inter,system-ui,-apple-system,"Segoe UI",Arial,sans-serif;background:var(--bg);color:var(--ink)}
.student-top{
  display:flex;justify-content:space-between;align-items:center;gap:14px;padding:14px 18px;background:#111827;color:#fff
}
.student-brand strong{display:block;font-size:16px}.student-brand span{display:block;font-size:10px;opacity:.72}
.student-top nav{display:flex;gap:6px;flex-wrap:wrap}.student-top a{color:#e5e7eb;text-decoration:none;padding:7px 9px;border-radius:8px;font-size:11px;font-weight:800}
.student-top a:hover,.student-top a.active{background:#263244;color:#fff}
.student-page{width:min(1220px,calc(100% - 24px));margin:18px auto 40px}
.student-hero{display:grid;grid-template-columns:1fr auto;gap:18px;align-items:center;padding:20px;border:1px solid var(--line);border-radius:20px;background:linear-gradient(135deg,#eef5ff,#fff8e5)}
.student-hero h1{margin:0 0 5px;font-size:clamp(1.7rem,3vw,2.5rem)}.student-hero p{margin:0;color:var(--muted)}
.progress-circle{width:110px;height:110px;border-radius:999px;display:grid;place-items:center;background:#fff;border:10px solid #dbe8ff;box-shadow:0 8px 24px rgba(15,23,42,.06)}
.progress-circle strong{font-size:24px}.progress-circle span{display:block;font-size:9px;color:var(--muted);text-align:center}
.student-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:9px;margin:12px 0}.student-stat{background:#fff;border:1px solid var(--line);border-radius:14px;padding:13px}.student-stat strong{display:block;font-size:22px}.student-stat span{font-size:10px;color:var(--muted)}
.student-card{background:#fff;border:1px solid var(--line);border-radius:17px;padding:16px;margin-top:12px;box-shadow:0 7px 22px rgba(15,23,42,.04)}
.student-card h2{margin:0 0 10px;font-size:18px}
.student-actions{display:flex;gap:8px;flex-wrap:wrap}
.student-btn{display:inline-flex;align-items:center;justify-content:center;min-height:39px;padding:8px 12px;border-radius:10px;background:linear-gradient(135deg,var(--blue),var(--violet));color:#fff;text-decoration:none;font-size:11px;font-weight:900;border:0;cursor:pointer}
.student-btn.secondary{background:#eef3fb;color:#28405f}
.lesson-list{display:grid;gap:6px}
.lesson-row{display:grid;grid-template-columns:42px minmax(0,1fr) auto auto;gap:9px;align-items:center;padding:9px;border:1px solid #e4e9f0;border-radius:11px;text-decoration:none;color:inherit}
.lesson-row:hover{background:#f8faff}.lesson-no{width:34px;height:34px;display:grid;place-items:center;border-radius:9px;background:#f0f4fa;font-weight:900;font-size:11px}
.lesson-copy strong{display:block;font-size:11px}.lesson-copy span{display:block;font-size:9px;color:var(--muted);margin-top:2px}
.status{display:inline-flex;padding:4px 7px;border-radius:999px;font-size:9px;font-weight:900;white-space:nowrap}
.status.pending{background:#fff3cf;color:#805400}.status.accepted{background:#e8f8ee;color:#166534}.status.revision{background:#fff0f0;color:#a52121}.status.none{background:#f1f3f6;color:#667085}
.lesson-progress{font-size:9px;color:var(--muted);white-space:nowrap}
.submission-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}
.submission-card{border:1px solid #e1e7ef;border-radius:12px;padding:11px;background:#fbfcfe}.submission-card strong{display:block;font-size:11px}.submission-card p{font-size:10px;color:var(--muted);margin:5px 0}.submission-card a{font-size:10px;font-weight:900;color:#2457a6}
.login-wrap{min-height:100vh;display:grid;place-items:center;padding:20px;background:radial-gradient(circle at top left,#eaf2ff,transparent 38%),var(--bg)}
.login-card{width:min(430px,100%);background:#fff;border:1px solid var(--line);border-radius:20px;padding:22px;box-shadow:0 18px 50px rgba(15,23,42,.09)}
.login-card h1{margin:0 0 5px}.login-card p{margin:0 0 16px;color:var(--muted);font-size:11px}
.login-form{display:grid;gap:11px}.login-form label{display:grid;gap:5px;font-size:11px;font-weight:800}.login-form input{min-height:43px;border:1px solid #cfd8e5;border-radius:10px;padding:8px 10px;font:inherit}
.login-error{padding:9px 11px;background:#fff0f0;color:#a52121;border:1px solid #f4c6c6;border-radius:10px;margin-bottom:10px;font-size:11px}
@media(max-width:720px){
  .student-top{align-items:flex-start;flex-direction:column;padding:10px}.student-top nav{width:100%;overflow-x:auto;flex-wrap:nowrap}
  .student-page{width:calc(100% - 12px);margin:8px auto 24px}.student-hero{grid-template-columns:1fr;padding:14px}.progress-circle{width:88px;height:88px}
  .student-stats{grid-template-columns:1fr 1fr}.lesson-row{grid-template-columns:36px minmax(0,1fr) auto}.lesson-progress{display:none}.submission-grid{grid-template-columns:1fr}
}


/* Оновлення v2.1: збільшена читабельність для кабінету учня */
body{font-size:18px;line-height:1.65}
.student-brand strong{font-size:19px}
.student-brand span{font-size:13px}
.student-top a{padding:9px 12px;font-size:14px}
.student-hero h1{font-size:clamp(2rem,3vw,2.9rem)}
.student-hero p{font-size:17px;line-height:1.7}
.progress-circle strong{font-size:28px}
.progress-circle span{font-size:12px}
.student-stat strong{font-size:28px}
.student-stat span{font-size:13px}
.student-card h2{font-size:24px}
.student-btn{min-height:46px;padding:10px 15px;font-size:14px}
.lesson-row{padding:12px}
.lesson-no{width:38px;height:38px;font-size:13px}
.lesson-copy strong{font-size:15px;line-height:1.35}
.lesson-copy span{font-size:12px;line-height:1.5}
.status{font-size:11px;padding:6px 10px}
.lesson-progress{font-size:12px}
.submission-card strong{font-size:15px}
.submission-card p,.submission-card a{font-size:13px;line-height:1.55}
.login-card h1{font-size:30px}
.login-card p{font-size:16px;line-height:1.7}
.login-form label{font-size:14px}
.login-form input{min-height:48px;font-size:16px}
.login-error{font-size:14px}
@media(max-width:760px){
  body{font-size:16px}
  .student-top a{font-size:13px}
  .student-hero p,.lesson-copy strong,.submission-card strong{font-size:15px}
  .lesson-copy span,.submission-card p,.submission-card a,.lesson-progress{font-size:12px}
  .student-card h2{font-size:21px}
}