:root{--ink:#112d42;--muted:#536774;--line:#d9e2e8;--paper:#fff;--bg:#f1f5f8;--blue:#145ba5;--teal:#087769;--green-bg:#e9f7ef;--red:#a32f3e;--red-bg:#fff0f1;--amber:#825800;--radius:12px;font-family:Inter,ui-sans-serif,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg);font-size:16px}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button{cursor:pointer;border:1px solid transparent;border-radius:8px;padding:11px 16px;font-weight:600;background:var(--blue);color:#fff}button:hover{filter:brightness(.95)}button:disabled{opacity:.45;cursor:not-allowed}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #e6aa30;outline-offset:3px}a{color:var(--blue)}.topbar{display:flex;align-items:center;gap:22px;padding:18px max(24px,calc((100vw - 1220px)/2));background:var(--ink);color:white;min-height:80px}.brand{display:flex;gap:12px;align-items:center;padding:0;background:none;font-size:21px;font-weight:400;white-space:nowrap}.brand-mark{display:grid;place-items:center;width:36px;height:36px;border-radius:8px;background:#fff;color:var(--ink);font-weight:800}.top-meta{font-size:12px;letter-spacing:.13em;color:#afc5d4;flex:1}.quiet{background:transparent;color:inherit;border-color:var(--line)}.topbar .quiet{border-color:#5d7687;font-size:14px}.secondary{background:white;color:var(--ink);border-color:var(--line)}.text-button{background:none;color:var(--blue);padding:5px;border:none}.danger{background:var(--red)}main{max-width:1220px;margin:auto;padding:36px 24px;min-height:calc(100vh - 140px)}
main.packet-mode{max-width:none;padding:18px 16px 24px;width:100%}
main:focus{outline:none}h1{font-size:32px;letter-spacing:-.035em;line-height:1.18;margin:0 0 10px}h2{font-size:23px;letter-spacing:-.025em;margin:0 0 16px}h3{font-size:18px;line-height:1.35;margin:0 0 10px}p{line-height:1.6}.muted{color:var(--muted)}.eyebrow{font-size:12px;font-weight:750;letter-spacing:.13em;text-transform:uppercase;color:var(--teal);margin-bottom:9px}.heading-row{display:flex;justify-content:space-between;gap:24px;align-items:center;margin-bottom:26px}.heading-row p{margin:0;color:var(--muted)}.pill{display:inline-block;font-size:12px;font-weight:650;border-radius:5px;padding:4px 7px;background:#e8eff5;color:#294a63}.metrics{display:grid;grid-template-columns:repeat(4,1fr);border:1px solid var(--line);border-radius:var(--radius);background:white;margin-bottom:26px;overflow:hidden}.metric{padding:20px 24px;border-right:1px solid var(--line)}.metric:last-child{border:0}.metric strong{display:block;font-size:29px;font-weight:750;letter-spacing:-.04em}.metric span{font-size:14px;color:var(--muted);display:block;margin-top:4px}.toolbar{display:flex;gap:12px;align-items:center;margin:22px 0;flex-wrap:wrap}.toolbar input{flex:1;min-width:180px}input,select{padding:11px 12px;border:1px solid #bfcdd7;border-radius:7px;background:white;color:var(--ink)}label{font-size:14px;font-weight:600}.field{display:grid;gap:8px;margin:20px 0}.weeknav{display:flex;gap:7px;flex-wrap:wrap;margin:18px 0 25px}.weeknav button{background:white;border-color:var(--line);color:var(--muted);font-size:14px;padding:8px 13px}.weeknav .active{background:var(--ink);color:white;border-color:var(--ink)}.grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.session{display:flex;flex-direction:column;padding:21px;background:white;border:1px solid var(--line);border-radius:var(--radius);min-height:226px}.session-top{display:flex;justify-content:space-between;margin-bottom:15px;align-items:center}.session h3{flex:1}.session p{font-size:14px;margin:0 0 14px;color:var(--muted)}.session-bottom{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-top:17px}.session-bottom span{font-size:13px;color:var(--muted)}.session button{font-size:14px;padding:9px 13px}.progress-track{height:5px;background:#e9eef3;border-radius:9px;overflow:hidden}.progress-track>span{display:block;background:var(--teal);height:100%}.banner{display:flex;justify-content:space-between;align-items:center;gap:18px;background:#e6eff8;border:1px solid #bfd2e7;padding:17px 20px;border-radius:10px;margin:0 0 23px}.banner p{margin:3px 0 0;font-size:14px}.actions{display:flex;gap:9px;flex-wrap:wrap}.empty{padding:35px;background:white;border:1px solid var(--line);border-radius:12px;color:var(--muted)}.study-layout{display:grid;grid-template-columns:minmax(0,1fr) 235px;gap:24px}.question-panel{background:white;border:1px solid var(--line);border-radius:var(--radius);padding:30px}.question-meta{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-bottom:25px;font-size:14px;color:var(--muted)}.stem{font-family:Georgia,"Times New Roman",serif;font-size:20px;line-height:1.72;white-space:pre-line;margin:0 0 26px;color:#152f42}.option{display:flex;align-items:flex-start;gap:13px;text-align:left;background:white;border:1px solid #cbd7df;color:var(--ink);border-radius:9px;width:100%;padding:15px 17px;margin-bottom:10px;font-weight:400;line-height:1.5}.option:disabled{opacity:1;cursor:default}.letter{flex-shrink:0;display:grid;place-items:center;width:28px;height:28px;border:1px solid #cbd7df;border-radius:6px;font-size:14px;font-weight:700}.option.selected{border:2px solid var(--blue);background:#edf4fc;padding:14px 16px}.option.selected .letter{background:var(--blue);color:white;border-color:var(--blue)}.option.correct{border-color:var(--teal);background:var(--green-bg)}.option.wrong{border-color:var(--red);background:var(--red-bg)}.option-status{font-size:12px;font-weight:700;display:block;margin-top:4px}.q-footer{display:flex;justify-content:space-between;gap:12px;margin-top:25px;border-top:1px solid var(--line);padding-top:22px}.navigator{position:sticky;top:20px;align-self:start;background:white;border:1px solid var(--line);border-radius:12px;padding:19px}.nav-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:6px;margin:18px 0}.nav-grid button{border:1px solid var(--line);font-size:12px;padding:8px 0;background:white;color:var(--ink);position:relative}.nav-grid button.answered{background:#dceaf7;border-color:#a6c5e5}.nav-grid button.current{outline:2px solid var(--blue);outline-offset:1px}.nav-grid button.flagged::after{content:'';width:5px;height:5px;position:absolute;top:2px;right:2px;background:#d69a16;border-radius:50%}.nav-grid button.correct{background:var(--green-bg);color:var(--teal)}.nav-grid button.wrong{background:var(--red-bg);color:var(--red)}.nav-key{font-size:12px;color:var(--muted);line-height:1.8}.timer{font-size:23px;letter-spacing:.03em;font-variant-numeric:tabular-nums;margin:12px 0}.full{width:100%}.explanation{margin-top:28px;border-top:3px solid var(--teal);padding-top:22px}.explanation h3{color:var(--teal)}.explanation p{margin:10px 0}.clue{padding:14px 17px;background:#eff7f5;border-left:3px solid var(--teal);margin:20px 0;line-height:1.6}.rationale{padding:12px 0;border-top:1px solid var(--line);line-height:1.6}.rationale strong{display:block;margin-bottom:3px}.source-list{font-size:14px;line-height:1.6;padding-left:18px}.anki{font-size:13px;overflow-wrap:anywhere;background:var(--bg);padding:12px;border-radius:8px;line-height:1.6}.review-row{display:flex;gap:14px;align-items:center;border-top:1px solid var(--line);padding:15px 0}.review-row div{flex:1}.review-row p{margin:3px 0;color:var(--muted);font-size:14px}.score{font-size:54px;color:var(--teal);font-weight:750;letter-spacing:-.04em}.result-panel{background:white;border:1px solid var(--line);border-radius:12px;padding:26px}.result-top{display:flex;align-items:center;gap:25px;margin-bottom:25px}.flag-on{color:var(--amber);border-color:#d7bb7b;background:#fff8e9}.notice{font-size:14px;line-height:1.6;background:#fff7e6;padding:12px 16px;border-radius:8px;margin-bottom:20px}dialog{border:1px solid var(--line);border-radius:16px;padding:28px;max-width:480px;width:calc(100% - 36px);color:var(--ink);box-shadow:0 20px 80px #112d4240}dialog::backdrop{background:#112d4270}dialog h2{margin-top:0}.dialog-actions{display:flex;justify-content:flex-end;gap:10px;margin-top:24px}.check{display:flex;align-items:center;gap:10px;line-height:1.5}.check input{width:18px;height:18px}.loading{padding:50px;text-align:center}footer{max-width:1220px;margin:0 auto;padding:12px 24px 25px;color:var(--muted);font-size:12px;line-height:1.6}.skip{position:fixed;left:15px;top:-60px;background:white;padding:10px;z-index:10}.skip:focus{top:10px}#toast{position:fixed;left:50%;bottom:24px;transform:translateX(-50%);background:var(--ink);color:white;padding:12px 20px;border-radius:8px;box-shadow:0 4px 20px #112d4230;display:none;z-index:20;max-width:90vw;font-size:14px}.question-image{max-width:100%;height:auto;display:block;margin:18px auto}.small{font-size:14px}details{margin:18px 0}summary{cursor:pointer;font-weight:600}body.modal-open{overflow:hidden}@media(max-width:950px){.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.study-layout{grid-template-columns:minmax(0,1fr) 200px}.question-panel{padding:24px}.metric{padding:17px}}@media(max-width:680px){.topbar{padding:15px 18px;gap:12px}.top-meta{display:none}.topbar .quiet{margin-left:auto;font-size:12px;padding:8px}main{padding:25px 16px}.heading-row{display:block}.heading-row .actions{margin-top:16px}h1{font-size:27px}.metrics{grid-template-columns:repeat(2,1fr)}.metric:nth-child(2){border:0}.metric:nth-child(-n+2){border-bottom:1px solid var(--line)}.metric strong{font-size:25px}.grid{grid-template-columns:1fr}.session{min-height:190px}.study-layout{display:flex;flex-direction:column}.navigator{position:static;width:100%}.nav-grid{grid-template-columns:repeat(10,1fr)}.question-panel{padding:20px}.stem{font-size:19px}.question-meta{flex-wrap:wrap}.q-footer{flex-wrap:wrap}.banner{align-items:flex-start;flex-direction:column}.result-top{gap:18px}.review-row{flex-wrap:wrap}.toolbar{gap:9px}.option{padding:13px}.option.selected{padding:12px}.score{font-size:45px}}@media(prefers-reduced-motion:no-preference){button{transition:background .12s,border-color .12s}.session:hover{border-color:#a7bdcd}}@media print{.topbar,.navigator,.q-footer,footer,.toolbar{display:none}.study-layout{display:block}.question-panel{border:0}}

/* Study plan + PDF viewer + mobile nav */
.top-nav{display:flex;gap:8px;align-items:center}
.topbar .top-meta{letter-spacing:.08em;text-transform:uppercase;flex:0 0 auto;margin-left:auto}
.topbar .top-meta[data-state="synced"]{color:#9ddeb8}
.topbar .top-meta[data-state="syncing"]{color:#f0d48a}
.topbar .top-meta[data-state="error"],.topbar .top-meta[data-state="offline"]{color:#f0b4b4}
.plan-step{background:white;border:1px solid var(--line);border-radius:var(--radius);padding:24px;margin-bottom:22px}
.plan-step-head{display:flex;gap:12px;align-items:center;margin-bottom:10px}
.plan-step-head h2{margin:0}
.success-note{background:#e9f7ef;color:#0f5c4c}
.packet-layout{display:flex;flex-direction:column;gap:14px;min-height:calc(100vh - 160px)}
.packet-chrome{display:flex;justify-content:space-between;gap:16px;align-items:flex-start;flex-wrap:wrap}
.packet-chrome h1{margin:0 0 4px;font-size:28px}
.packet-chrome .actions a{display:inline-flex;align-items:center;text-decoration:none}
.pdf-frame{flex:1;width:100%;min-height:min(78vh,900px);height:78vh;border:1px solid var(--line);border-radius:12px;background:#525659}
.danger-outline{border-color:#d7a0a6;color:var(--red);background:white}
.heading-row .actions{flex-wrap:wrap;justify-content:flex-end}
@media(max-width:680px){
  .top-nav{order:3;width:100%;margin-top:4px}
  .topbar{flex-wrap:wrap;min-height:0;padding:12px 14px}
  .topbar .top-meta{display:inline-block;margin-left:0}
  .topbar .quiet{margin-left:0;padding:10px 12px;min-height:44px}
  .plan-step{padding:18px}
  .option,.session button{min-height:44px}
  .pdf-frame{min-height:70vh;height:70vh}
  .packet-chrome h1{font-size:22px}
}