:root{--bg:#07111f;--panel:#0d182a;--panel2:#111f34;--panel3:#162842;--text:#edf5ff;--muted:#91a4bb;--line:#203550;--accent:#36a7ff;--accent2:#29e0a5;--danger:#ff6b7a;--warn:#ffca5c;--shadow:0 20px 60px rgba(0,0,0,.28);--radius:20px}
*{box-sizing:border-box}html,body{margin:0;min-height:100%;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:radial-gradient(circle at 15% 0%,rgba(54,167,255,.10),transparent 28%),radial-gradient(circle at 90% 15%,rgba(41,224,165,.06),transparent 24%),var(--bg);color:var(--text)}button,input,select,textarea{font:inherit}button{cursor:pointer}.app{min-height:100vh;display:flex}.sidebar{width:270px;position:fixed;inset:0 auto 0 0;background:rgba(5,13,25,.96);border-right:1px solid var(--line);padding:18px 14px;display:flex;flex-direction:column;z-index:30}.brand{display:flex;gap:11px;align-items:center;padding:6px 8px 18px}.brand img{width:42px;height:42px;object-fit:contain;border-radius:12px}.brand b{font-size:13px}.brand span{display:block;color:var(--muted);font-size:10px;margin-top:2px}.profile{background:linear-gradient(145deg,#0f2138,#0b1729);border:1px solid var(--line);border-radius:18px;padding:14px;margin-bottom:16px}.avatar{width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#04111f;font-weight:900;margin-bottom:9px}.profile strong{display:block}.profile small{color:var(--muted)}.nav-title{font-size:9px;letter-spacing:.12em;color:#6f8299;font-weight:800;text-transform:uppercase;padding:0 9px 8px}.nav{display:grid;gap:5px}.nav button{width:100%;border:1px solid transparent;background:transparent;color:#b8c7d8;text-align:left;padding:10px 11px;border-radius:11px;display:flex;justify-content:space-between;align-items:center}.nav button:hover,.nav button.active{background:#11233a;border-color:#24405e;color:#fff}.sidebar-footer{margin-top:auto;color:#647891;font-size:9px;line-height:1.5;padding:10px}.main{margin-left:270px;width:calc(100% - 270px);padding:22px;min-width:0}.mobile-top{display:none}.home{max-width:1180px;margin:auto;display:grid;gap:14px}.hero{border:1px solid var(--line);background:linear-gradient(135deg,rgba(20,38,62,.96),rgba(11,22,39,.94));border-radius:24px;padding:24px;box-shadow:var(--shadow)}.eyebrow{font-size:10px;letter-spacing:.14em;text-transform:uppercase;color:#62b8ff;font-weight:900}.hero h1{font-size:30px;margin:7px 0}.hero p{color:var(--muted);max-width:760px;margin:0;line-height:1.6}.hero-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:15px}.btn{border:1px solid #294360;background:#12243a;color:#e9f4ff;border-radius:12px;padding:10px 14px;font-weight:800}.btn:hover{filter:brightness(1.12)}.btn.primary{background:linear-gradient(135deg,#289bff,#2bd9a1);border:0;color:#04111c}.btn.danger{border-color:#64323b;color:#ffb7bf}.btn.ghost{background:transparent}.section{border:1px solid var(--line);background:rgba(10,21,37,.92);border-radius:20px;padding:17px}.section-head{display:flex;justify-content:space-between;align-items:end;gap:10px;margin-bottom:12px}.section-head h2{font-size:17px;margin:0}.section-head p{margin:3px 0 0;color:var(--muted);font-size:11px}.history-strip{display:grid;grid-template-columns:1.2fr repeat(3,1fr);gap:9px}.history-card,.kpi,.preset,.achievement{border:1px solid var(--line);background:linear-gradient(145deg,#0f1e32,#0c1728);border-radius:16px;padding:13px}.history-card strong{display:block;font-size:17px;margin-top:3px}.history-card small,.kpi small{color:var(--muted)}.kpis{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:9px}.kpi .label{font-size:9px;color:#7e93aa;letter-spacing:.1em;text-transform:uppercase;font-weight:800}.kpi strong{display:block;font-size:24px;margin-top:4px}.kpi small{font-size:10px}.preset-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.preset{cursor:pointer}.preset:hover{border-color:#35638d;background:#132843}.preset strong{display:block}.preset span{color:var(--muted);font-size:11px}.achievements{display:flex;flex-wrap:wrap;gap:8px}.achievement{padding:8px 11px;color:#aebed0;font-size:11px}.achievement.unlocked{color:#dffdf4;border-color:#1e6b57;background:#0d2a26}.setup-grid{display:grid;grid-template-columns:1.3fr 1fr;gap:12px}.setup-card{border:1px solid var(--line);background:#0b1728;border-radius:18px;padding:15px}.setup-card h3{margin:0 0 4px}.muted{color:var(--muted);font-size:11px}.field-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:11px;margin-top:14px}.field label{display:block;color:#91a4bb;font-size:10px;text-transform:uppercase;letter-spacing:.09em;font-weight:800;margin-bottom:6px}.field select,.field input,.field textarea{width:100%;background:#0a1424;border:1px solid #29405d;color:#eef6ff;border-radius:11px;padding:10px;outline:none}.field select:focus,.field input:focus,.field textarea:focus{border-color:#3e91d1}.chapter-picker{position:relative}.chapter-toggle{width:100%;text-align:left;background:#0a1424;border:1px solid #29405d;color:#eef6ff;border-radius:11px;padding:10px}.chapter-menu{display:none;position:absolute;left:0;right:0;top:calc(100% + 6px);background:#0b1728;border:1px solid #2b4765;border-radius:14px;padding:9px;z-index:10;box-shadow:var(--shadow);max-height:340px;overflow:auto}.chapter-menu.open{display:block}.chapter-search{width:100%;background:#081321;border:1px solid #29405d;color:#fff;border-radius:9px;padding:8px;margin-bottom:7px}.chapter-actions{display:flex;gap:6px;margin-bottom:7px}.chapter-actions button{font-size:10px;padding:6px 8px}.chapter-option{display:flex;gap:8px;align-items:flex-start;padding:7px;border-radius:8px;font-size:11px;color:#c7d5e5}.chapter-option:hover{background:#11243a}.setup-actions{display:flex;gap:8px;align-items:center;flex-wrap:wrap;margin-top:14px}.pool-note{margin-top:8px;color:#7389a2;font-size:10px}.mobile-only{display:none}.overlay{position:fixed;inset:0;background:rgba(2,8,16,.76);backdrop-filter:blur(8px);z-index:100;display:none;align-items:center;justify-content:center;padding:16px}.overlay.open{display:flex}.modal{width:min(920px,100%);max-height:92vh;overflow:auto;background:#091627;border:1px solid #29415d;border-radius:22px;box-shadow:0 30px 100px rgba(0,0,0,.5)}.modal.large{width:min(1120px,100%)}.modal-head{position:sticky;top:0;z-index:2;background:#0a1728;border-bottom:1px solid var(--line);padding:15px 17px;display:flex;justify-content:space-between;align-items:center;gap:10px}.modal-head h2{margin:0;font-size:18px}.modal-body{padding:17px}.close{border:1px solid #304760;background:#101f33;color:#dce9f6;border-radius:10px;padding:8px 11px}.login-grid{display:grid;grid-template-columns:1fr 1fr;gap:15px}.login-card{padding:22px}.login-logo{width:72px;height:72px;object-fit:contain;border-radius:20px;margin-bottom:10px}.login-card h2{margin:0 0 7px}.login-card p{color:var(--muted);line-height:1.55}.exam-shell{display:grid;grid-template-columns:1fr 260px;min-height:600px}.exam-main{padding:18px}.exam-side{border-left:1px solid var(--line);padding:15px;background:#081321}.timer{font-size:24px;font-weight:900}.progress{height:7px;background:#102136;border-radius:99px;overflow:hidden;margin:8px 0}.progress span{display:block;height:100%;background:linear-gradient(90deg,var(--accent),var(--accent2));width:0}.question-card{border:1px solid var(--line);background:#0d1a2d;border-radius:18px;padding:16px;margin-bottom:12px}.question-meta{display:flex;justify-content:space-between;gap:8px;color:#7f95ac;font-size:10px;text-transform:uppercase;letter-spacing:.08em}.question-card h3{font-size:17px;line-height:1.45;margin:11px 0 14px}.option{display:flex;gap:10px;align-items:flex-start;padding:11px;border:1px solid #263d58;border-radius:11px;margin:7px 0;background:#0b1728}.option:hover{border-color:#3d6b92}.option input{margin-top:3px}.order-row,.match-row{display:grid;grid-template-columns:1fr 150px;gap:8px;align-items:center;padding:8px;border:1px solid #263d58;border-radius:10px;margin:7px 0}.review-grid{display:grid;gap:10px}.review-item{border:1px solid var(--line);border-radius:14px;padding:13px;background:#0d1a2d}.review-item.correct{border-color:#236b55}.review-item.incorrect{border-color:#6d3640}.empty{border:1px dashed #314a64;border-radius:14px;padding:24px;text-align:center;color:var(--muted)}.tool-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:10px}.tool-card{border:1px solid var(--line);background:#0c192b;border-radius:15px;padding:13px}.tool-card h3{margin:0 0 4px;font-size:14px}.tool-card p{margin:0 0 10px;color:var(--muted);font-size:11px}.table{width:100%;border-collapse:collapse;font-size:11px}.table th,.table td{text-align:left;padding:9px;border-bottom:1px solid var(--line)}.search-results{display:grid;gap:8px;max-height:60vh;overflow:auto}.result{padding:11px;border:1px solid var(--line);border-radius:12px;background:#0d1a2d}.light{--bg:#f2f6fb;--panel:#fff;--panel2:#f7faff;--panel3:#eaf1f8;--text:#102033;--muted:#62758b;--line:#d8e2ed}.light .sidebar{background:#fff}.light .hero,.light .section,.light .setup-card,.light .modal,.light .modal-head,.light .exam-side,.light .question-card,.light .tool-card,.light .result,.light .history-card,.light .kpi,.light .preset,.light .achievement{background:#fff}.focus .sidebar,.focus .hero-actions,.focus .section:not(#setupSection),.focus .mobile-top{display:none}.focus .main{margin-left:0;width:100%;padding:12px}.focus .home{max-width:1000px}.focus .hero{margin-bottom:8px}.focus .setup-card{display:none}
@media(max-width:1050px){.sidebar{width:235px}.main{margin-left:235px;width:calc(100% - 235px)}.kpis{grid-template-columns:repeat(3,1fr)}.history-strip{grid-template-columns:repeat(2,1fr)}.setup-grid{grid-template-columns:1fr}.exam-shell{grid-template-columns:1fr}.exam-side{border-left:0;border-top:1px solid var(--line)}}
@media(max-width:760px){.sidebar{transform:translateX(-100%);transition:.2s;width:280px}.sidebar.open{transform:translateX(0)}.main{margin-left:0;width:100%;padding:10px;padding-top:64px}.mobile-top{display:flex;position:fixed;top:10px;left:10px;right:10px;height:44px;z-index:40;background:rgba(7,17,31,.88);backdrop-filter:blur(12px);border:1px solid var(--line);border-radius:13px;align-items:center;justify-content:space-between;padding:0 9px}.mobile-top button{background:#102138;border:1px solid #29415d;color:#fff;border-radius:9px;padding:7px 10px}.hero{padding:18px}.hero h1{font-size:24px}.kpis{grid-template-columns:repeat(2,1fr)}.preset-grid{grid-template-columns:1fr}.field-grid,.login-grid,.tool-grid{grid-template-columns:1fr}.history-strip{grid-template-columns:1fr 1fr}.overlay{padding:8px}.modal{max-height:96vh;border-radius:17px}.chapter-menu{position:fixed;left:14px;right:14px;top:100px;max-height:65vh}.exam-shell{min-height:0}.order-row,.match-row{grid-template-columns:1fr}.sidebar-footer{padding-bottom:20px}}
@media(max-width:430px){.kpis{grid-template-columns:1fr 1fr}.history-strip{grid-template-columns:1fr}.hero-actions .btn{width:100%}.setup-actions .btn{flex:1}.section,.setup-card{padding:13px}}


/* Functional student profile picture */
.profile-avatar-button{
  position:relative;
  display:block;
  width:72px;
  height:72px;
  padding:0;
  margin:0 auto 10px;
  border:0;
  background:transparent;
  cursor:pointer;
}
.profile-avatar-button .avatar{
  width:72px;
  height:72px;
  min-width:72px;
  min-height:72px;
  display:flex;
  align-items:center;
  justify-content:center;
  border-radius:50%;
  overflow:hidden;
  background-size:cover;
  background-position:center;
  background-repeat:no-repeat;
  border:2px solid rgba(80,160,255,.42);
  color:#dcecff;
  font-weight:800;
  letter-spacing:.04em;
}
.profile-avatar-button .avatar.has-photo{
  color:transparent;
}
.avatar-upload-badge{
  position:absolute;
  right:-2px;
  bottom:-2px;
  width:24px;
  height:24px;
  display:flex;
  align-items:center;
  justify-content:center;
  border-radius:50%;
  background:#17c7a3;
  color:#06121f;
  border:2px solid #0a1424;
  font-size:18px;
  font-weight:900;
  line-height:1;
}
.profile-photo-actions{
  display:flex;
  gap:6px;
  justify-content:center;
  flex-wrap:wrap;
  margin:8px 0 4px;
}
.profile-photo-actions .compact{
  padding:6px 9px;
  font-size:11px;
}
.profile-photo-actions .danger{
  opacity:.82;
}
.profile-photo-actions button:disabled{
  opacity:.35;
  cursor:not-allowed;
}
.profile-photo-hint{
  display:block;
  text-align:center;
  font-size:9px;
  line-height:1.35;
  opacity:.58;
  margin-bottom:8px;
}