:root{--bg:#f3f6f9;--panel:#fff;--panel-2:#f7f9fb;--text:#132235;--muted:#65758b;--line:#dce4ec;--nav:#0b1f33;--nav-text:#c7d4e3;--accent:#2b7fff;--accent-2:#125fd1;--success:#18a66a;--danger:#dc4b5d;--warning:#e49b2e;--shadow:0 12px 32px rgba(23,43,77,.08);--radius:16px}
[data-theme="dark"]{--bg:#0b1420;--panel:#111e2c;--panel-2:#172636;--text:#edf4fb;--muted:#9db0c3;--line:#26394c;--nav:#07111c;--accent:#5b9bff;--accent-2:#7baeff;--shadow:0 12px 32px rgba(0,0,0,.22)}
*{box-sizing:border-box}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;background:var(--bg);color:var(--text)}button,input,select,textarea{font:inherit}.app-shell{min-height:100vh;display:grid;grid-template-columns:250px 1fr}.sidebar{position:sticky;top:0;height:100vh;background:var(--nav);color:white;padding:24px 16px;display:flex;flex-direction:column;z-index:10}.brand{display:flex;gap:12px;align-items:center;padding:0 8px 28px}.brand-mark{display:grid;place-items:center;width:45px;height:45px;border-radius:12px;background:linear-gradient(135deg,#3389ff,#83b5ff);font-weight:800}.brand strong,.brand small{display:block}.brand small{color:#8ea6be;margin-top:2px}nav{display:grid;gap:6px}nav button{border:0;background:transparent;color:var(--nav-text);text-align:left;padding:12px 14px;border-radius:10px;cursor:pointer}nav button:hover,nav button.active{background:#17314c;color:white}.sidebar-footer{margin-top:auto;display:flex;align-items:center;justify-content:space-between;color:#8ea6be;font-size:12px;padding:12px 8px}.topbar{height:92px;padding:18px 30px;display:flex;align-items:center;border-bottom:1px solid var(--line);background:var(--panel);position:sticky;top:0;z-index:5}.topbar h1{font-size:22px;margin:2px 0}.eyebrow{font-size:10px;letter-spacing:.14em;color:var(--muted);margin:0}.topbar .button{margin-left:auto}.view{padding:28px 30px;max-width:1500px;margin:auto}.button{border:1px solid var(--line);background:var(--panel);color:var(--text);padding:10px 15px;border-radius:10px;cursor:pointer;font-weight:650}.button:hover{transform:translateY(-1px)}.button.primary{background:var(--accent);border-color:var(--accent);color:white}.button.danger{color:var(--danger);border-color:color-mix(in srgb,var(--danger) 45%,var(--line))}.button.small{padding:7px 10px;font-size:12px}.icon-button{border:0;background:transparent;color:inherit;cursor:pointer;font-size:20px}.mobile-only{display:none}.grid{display:grid;gap:18px}.stats-grid{grid-template-columns:repeat(6,minmax(140px,1fr));margin-bottom:22px}.card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}.stat small,.muted{color:var(--muted)}.stat strong{display:block;font-size:30px;margin-top:8px}.stat.success strong{color:var(--success)}.stat.warning strong{color:var(--warning)}.progress{height:8px;background:var(--line);border-radius:99px;overflow:hidden}.progress>span{display:block;height:100%;background:linear-gradient(90deg,var(--accent),#65b4ff)}.hero{display:grid;grid-template-columns:1.5fr 1fr;gap:22px}.hero h2{font-size:30px;max-width:650px;margin:5px 0 12px}.actions{display:flex;gap:10px;flex-wrap:wrap}.section-title{display:flex;align-items:end;justify-content:space-between;margin:0 0 16px}.section-title h2{margin:0}.toolbar{display:grid;grid-template-columns:minmax(240px,1fr) repeat(3,minmax(150px,220px));gap:10px;margin-bottom:14px}.field{display:grid;gap:6px}.field label{font-size:12px;color:var(--muted);font-weight:700}.field input,.field select,.field textarea,.search{width:100%;background:var(--panel);color:var(--text);border:1px solid var(--line);border-radius:10px;padding:10px 12px}.field textarea{min-height:90px;resize:vertical}.table-wrap{overflow:auto;background:var(--panel);border:1px solid var(--line);border-radius:14px}.data-table{border-collapse:collapse;width:100%;min-width:900px}.data-table th,.data-table td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--line);font-size:13px}.data-table th{color:var(--muted);font-size:11px;text-transform:uppercase;letter-spacing:.06em;background:var(--panel-2);position:sticky;top:0}.data-table tr:hover td{background:var(--panel-2)}.question-cell{max-width:520px}.badge{display:inline-flex;padding:4px 8px;border-radius:99px;background:var(--panel-2);border:1px solid var(--line);font-size:11px}.badge.success{color:var(--success)}.badge.warning{color:var(--warning)}.pagination{display:flex;align-items:center;justify-content:space-between;margin-top:14px}.modal-backdrop{position:fixed;inset:0;background:rgba(1,10,20,.65);display:grid;place-items:center;padding:20px;z-index:30}.modal{background:var(--panel);border:1px solid var(--line);border-radius:18px;width:min(900px,100%);max-height:94vh;overflow:auto;box-shadow:0 25px 80px rgba(0,0,0,.3)}.modal-head,.modal-foot{padding:18px 22px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.modal-foot{border-top:1px solid var(--line);border-bottom:0}.modal-body{padding:22px}.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:14px}.span-2{grid-column:span 2}.answer-key{display:flex;gap:10px}.answer-key label{flex:1;border:1px solid var(--line);border-radius:10px;padding:12px;text-align:center;cursor:pointer}.answer-key label:has(input:checked){border-color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,var(--panel))}.setup-grid{grid-template-columns:repeat(3,1fr)}.study-card{max-width:900px;margin:auto;padding:28px}.study-meta{display:flex;justify-content:space-between;color:var(--muted);font-size:13px}.study-card h2{font-size:23px;line-height:1.45;margin:24px 0}.answers{display:grid;gap:12px}.answer{display:flex;gap:12px;align-items:flex-start;padding:15px;border:1px solid var(--line);border-radius:12px;cursor:pointer;background:var(--panel)}.answer:hover{border-color:var(--accent)}.answer.selected{border-color:var(--accent);background:color-mix(in srgb,var(--accent) 9%,var(--panel))}.answer.correct{border-color:var(--success);background:color-mix(in srgb,var(--success) 10%,var(--panel))}.answer.incorrect{border-color:var(--danger);background:color-mix(in srgb,var(--danger) 9%,var(--panel))}.answer-letter{font-weight:800;color:var(--accent)}.feedback{padding:14px;margin-top:16px;border-radius:10px;font-weight:700}.feedback.success{background:color-mix(in srgb,var(--success) 14%,var(--panel));color:var(--success)}.feedback.danger{background:color-mix(in srgb,var(--danger) 12%,var(--panel));color:var(--danger)}.warning-box{border-left:4px solid var(--warning);background:color-mix(in srgb,var(--warning) 10%,var(--panel));padding:14px;border-radius:8px}.category-list{display:grid;gap:10px}.category-row{display:flex;align-items:center;gap:12px;padding:12px;border:1px solid var(--line);border-radius:10px}.category-row span{flex:1}.empty{text-align:center;padding:50px 20px;color:var(--muted)}#toast{position:fixed;right:25px;top:105px;background:#10253a;color:white;padding:12px 18px;border-radius:10px;z-index:60;opacity:0;transform:translateY(-8px);pointer-events:none;transition:.2s}#toast.show{opacity:1;transform:none}.review-list{display:grid;gap:12px}.review-item{padding:14px;border:1px solid var(--line);border-radius:10px}.review-item strong{display:block;margin-bottom:6px}.session-score{text-align:center}.session-score .score{font-size:60px;color:var(--accent);font-weight:800}
@media(max-width:1100px){.stats-grid{grid-template-columns:repeat(3,1fr)}.toolbar{grid-template-columns:1fr 1fr}.hero{grid-template-columns:1fr}.setup-grid{grid-template-columns:1fr 1fr}}
@media(max-width:760px){.app-shell{display:block}.sidebar{position:fixed;left:-270px;transition:.2s;width:250px}.sidebar.open{left:0}.topbar{padding:14px 16px}.view{padding:18px 14px}.mobile-only{display:block;margin-right:12px}.topbar .button{display:none}.stats-grid{grid-template-columns:1fr 1fr}.toolbar,.form-grid,.setup-grid{grid-template-columns:1fr}.span-2{grid-column:auto}.stat strong{font-size:24px}.hero h2{font-size:25px}.modal-foot{flex-wrap:wrap;gap:8px}}
.resume-card,.session-header{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:18px}.session-header{max-width:1100px;margin-left:auto;margin-right:auto;flex-wrap:wrap}.session-metrics{display:flex;gap:18px;flex-wrap:wrap;color:var(--muted);font-size:12px}.session-metrics strong{display:block;color:var(--text);font-size:17px}.span-full{flex-basis:100%}.study-footer{display:flex;justify-content:space-between;gap:10px;margin-top:22px}.feedback-detail{display:flex;gap:28px;margin-top:10px}.results-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:12px;margin:24px 0}.results-grid span{padding:14px;background:var(--panel-2);border-radius:10px;color:var(--muted)}.results-grid strong{display:block;font-size:22px;color:var(--text);margin-top:5px}.quick-select{background:var(--panel);color:var(--text);border:1px solid var(--line);border-radius:7px;padding:6px}.quick-answers{display:flex;gap:4px}.quick-answer{width:30px;height:30px;border:1px solid var(--line);border-radius:7px;background:var(--panel);color:var(--text);cursor:pointer}.quick-answer.active{background:var(--accent);color:white;border-color:var(--accent)}.switch input{display:none}.switch span{display:block;width:38px;height:22px;border-radius:99px;background:var(--line);position:relative;cursor:pointer}.switch span:after{content:"";position:absolute;width:16px;height:16px;left:3px;top:3px;background:white;border-radius:50%;transition:.2s}.switch input:checked+span{background:var(--success)}.switch input:checked+span:after{left:19px}.manager-toolbar{grid-template-columns:minmax(220px,1fr) repeat(5,minmax(135px,190px))}.go-question{display:flex;gap:6px}.go-question input{min-width:0}.row-saved{display:inline-block;margin-right:6px;color:var(--success);font-size:11px;font-weight:800}.saved-flash td{animation:saved-row 1.2s ease}@keyframes saved-row{0%,100%{background:transparent}25%{background:color-mix(in srgb,var(--success) 16%,var(--panel))}}
@media(max-width:1100px){.results-grid{grid-template-columns:repeat(3,1fr)}.manager-toolbar{grid-template-columns:1fr 1fr}}
@media(max-width:760px){.resume-card,.session-header,.study-footer{align-items:stretch;flex-direction:column}.results-grid{grid-template-columns:1fr 1fr}.feedback-detail{flex-direction:column;gap:5px}}

/* iPad study layout and distraction-free focus mode */
.focus-enter,.focus-exit{position:fixed;right:max(18px,env(safe-area-inset-right));z-index:25;box-shadow:0 8px 28px rgba(0,0,0,.2)}
.focus-enter{display:none;bottom:max(18px,env(safe-area-inset-bottom));background:var(--nav);border-color:var(--nav);color:#fff}
.study-active:not(.focus-mode) .focus-enter{display:block}
.focus-exit{top:max(16px,env(safe-area-inset-top));background:var(--nav);border-color:var(--nav);color:#fff;z-index:70}
.focus-exit[hidden]{display:none}
body.focus-mode{overflow-x:hidden}
body.focus-mode .sidebar,body.focus-mode .topbar{display:none!important}
body.focus-mode .app-shell{display:block;min-height:100dvh}
body.focus-mode main{min-width:0}
body.focus-mode .view{width:100%;max-width:1180px;min-height:100dvh;padding:max(64px,calc(env(safe-area-inset-top) + 50px)) max(24px,env(safe-area-inset-right)) max(24px,env(safe-area-inset-bottom)) max(24px,env(safe-area-inset-left));display:flex;flex-direction:column;justify-content:center}
body.focus-mode .session-header{width:100%;max-width:1000px}
body.focus-mode .study-card{width:100%;max-width:1000px}
body.focus-mode #toast{top:max(70px,calc(env(safe-area-inset-top) + 54px))}

@media(min-width:761px) and (max-width:1180px){.app-shell{grid-template-columns:210px 1fr}.sidebar{padding:20px 12px}.brand{padding-bottom:22px}.topbar{height:80px;padding:14px 22px}.view{padding:22px}.stats-grid{grid-template-columns:repeat(3,1fr)}.hero{grid-template-columns:1fr}.study-card{padding:26px}.answer{min-height:54px;padding:16px}.button{min-height:44px}.session-metrics{gap:14px}}

@media(max-width:760px){.focus-enter,.focus-exit{right:max(12px,env(safe-area-inset-right))}.focus-enter{bottom:max(12px,env(safe-area-inset-bottom))}.focus-exit{top:max(10px,env(safe-area-inset-top));font-size:13px}body.focus-mode .view{padding:max(58px,calc(env(safe-area-inset-top) + 48px)) max(14px,env(safe-area-inset-right)) max(18px,env(safe-area-inset-bottom)) max(14px,env(safe-area-inset-left))}body.focus-mode .study-card{padding:20px}.answer{min-height:52px}}
.login-backdrop{z-index:100}.login-modal{width:min(440px,100%)}.login-modal h2{margin:4px 0}.login-error{min-height:20px;margin:12px 0 0;color:var(--danger);font-weight:700}.login-modal .modal-foot{justify-content:flex-end}
.login-fields{display:grid;gap:14px}.sidebar-actions{display:flex;align-items:center;gap:8px}.sidebar-actions .icon-button{width:34px;height:34px;border-radius:8px}.sidebar-actions .icon-button:hover{background:#17314c;color:#fff}
body.auth-required .app-shell,body.auth-required>.focus-enter,body.auth-required>.focus-exit{visibility:hidden}.login-backdrop{background:var(--bg)}
.remember-option{display:flex;align-items:center;gap:9px;color:var(--muted);font-size:13px;cursor:pointer}.remember-option input{width:18px;height:18px;accent-color:var(--accent)}
.figure-links{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin:16px 0}.figure-links>span{color:var(--muted);font-size:13px;font-weight:700}.figure-link{color:var(--accent);border-color:color-mix(in srgb,var(--accent) 45%,var(--line))}.figure-backdrop{padding:max(12px,env(safe-area-inset-top)) max(12px,env(safe-area-inset-right)) max(12px,env(safe-area-inset-bottom)) max(12px,env(safe-area-inset-left));z-index:90}.figure-modal{width:min(1100px,100%);height:min(94dvh,1000px);display:flex;flex-direction:column}.figure-modal .modal-head{flex:0 0 auto}.figure-modal .modal-head h2{margin:0}.figure-canvas{flex:1;overflow:auto;background:#eef2f5;padding:12px;text-align:center;overscroll-behavior:contain;-webkit-overflow-scrolling:touch}.figure-canvas img{display:block;width:auto;max-width:100%;height:auto;margin:auto}.figure-modal .modal-foot{flex:0 0 auto;gap:10px}
@media(max-width:760px){.figure-modal{height:calc(100dvh - 16px);border-radius:14px}.figure-canvas{padding:6px}.figure-modal .modal-head,.figure-modal .modal-foot{padding:12px 14px}.figure-links{align-items:stretch;flex-direction:column}.figure-links>span{margin-bottom:2px}.figure-link{width:100%}}
.performance-card{position:relative}.performance-reset{position:absolute;right:18px;top:14px;color:var(--muted)}@media(max-width:760px){.performance-card{padding-top:58px}.performance-reset{top:14px;right:14px}}
nav button{display:flex;align-items:center;gap:12px}nav button svg{width:19px;height:19px;flex:0 0 19px;fill:none;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}
.session-exit{margin-left:auto;color:var(--muted)}@media(max-width:760px){.session-exit{width:100%;margin-left:0}.study-footer #study-action{width:100%}}