:root{--navy:#103b60;--teal:#157f83;--ink:#172736;--muted:#647586;--line:#d9e3ea;--bg:#f3f7fa;--danger:#a63b3b}
*{box-sizing:border-box}html,body{margin:0;font-family:Inter,system-ui,-apple-system,"Segoe UI",sans-serif;color:var(--ink);background:var(--bg)}
button,input,select{font:inherit}.hidden{display:none!important}.screen{min-height:100vh}.brandline{font-size:12px;text-transform:uppercase;letter-spacing:.12em;font-weight:800;color:var(--teal)}.brandline.small{font-size:10px}
.start-screen{display:grid;place-items:center;padding:30px}.start-card{width:min(820px,100%);background:#fff;border:1px solid var(--line);border-radius:18px;padding:42px;box-shadow:0 14px 40px rgba(20,49,74,.08)}
h1{color:var(--navy)}.lead{font-size:18px;line-height:1.55;color:#486071}.start-grid,.summary-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin:24px 0}
.stat,.summary-card{border:1px solid var(--line);border-radius:12px;padding:17px;background:#fbfdfe;text-align:center}.stat strong,.summary-card strong{font-size:26px;color:var(--navy);display:block}.stat span,.summary-card span{font-size:12px;color:var(--muted)}
.email-box{display:block;border:1px solid var(--line);border-radius:12px;padding:15px;margin:20px 0;background:#fbfdfe}.email-box small{display:block;color:var(--muted);margin:4px 0 10px}.email-box input{width:100%}
.notice{border-left:4px solid var(--teal);background:#f5fbfb;padding:15px 17px;line-height:1.5;margin:20px 0}.resume-area{margin-top:16px}.resume-form{display:flex;gap:8px;margin-top:8px}.link-btn{border:0;background:transparent;color:var(--teal);padding:0}.error{color:var(--danger);min-height:22px;margin-top:10px}
.primary,.secondary,.ghost,.tool{border-radius:9px;padding:10px 16px;font-weight:750;border:1px solid transparent;cursor:pointer}.primary{background:var(--navy);color:#fff}.secondary{border-color:#8db7bb;color:var(--navy);background:#eef8f8}.ghost,.tool{border-color:var(--line);background:#fff;color:var(--ink)}.large{padding:14px 22px;font-size:16px}.small{padding:6px 9px}
input,select{border:1px solid var(--line);border-radius:8px;padding:10px;background:#fff}
.exam-header{position:sticky;top:0;z-index:20;background:#fff;border-bottom:1px solid var(--line);padding:13px 24px;display:grid;grid-template-columns:1fr minmax(250px,500px) 1fr;gap:18px;align-items:center}.header-center{text-align:center}.progress{height:5px;background:#e9eff3;border-radius:99px;margin-top:8px;overflow:hidden}.progress span{display:block;height:100%;background:var(--teal)}.header-tools{display:flex;justify-content:flex-end;align-items:center;gap:8px}.timer{font-variant-numeric:tabular-nums;font-weight:800;color:var(--navy)}.case-label{font-size:12px;color:var(--muted);margin-top:4px}
.exam-layout{max-width:1320px;margin:0 auto;padding:25px;display:grid;grid-template-columns:minmax(330px,410px) minmax(0,820px);gap:23px}.exam-layout.no-case{grid-template-columns:minmax(0,900px);justify-content:center}.case-panel,.question-panel,.report-section,.results-head{background:#fff;border:1px solid var(--line);border-radius:14px;box-shadow:0 8px 24px rgba(20,49,74,.05)}.case-panel{align-self:start;position:sticky;top:104px;overflow:hidden}.case-head{padding:15px 17px;border-bottom:1px solid var(--line)}.case-head span{display:block;color:var(--muted);font-size:11px;text-transform:uppercase}.tabs{display:flex;overflow:auto;border-bottom:1px solid var(--line)}.tab{border:0;border-right:1px solid var(--line);background:#f8fafc;padding:9px 11px;white-space:nowrap;font-size:12px}.tab.active{background:#fff;box-shadow:inset 0 -3px 0 var(--teal);font-weight:750}.exhibit-body{padding:17px;white-space:pre-wrap;line-height:1.55;max-height:62vh;overflow:auto}
.question-panel{padding:28px 30px;min-height:560px;display:flex;flex-direction:column}.format-instruction{font-size:13px;color:var(--muted)}.stem{font-size:18px;line-height:1.58;white-space:pre-line}.option{display:flex;gap:11px;border:1px solid var(--line);border-radius:10px;padding:12px 13px;margin:8px 0;background:#fff}.option:has(input:checked){border-color:var(--teal);background:#eaf6f6}.option input{margin-top:4px;accent-color:var(--teal)}.question-footer{border-top:1px solid var(--line);margin-top:auto;padding-top:16px;display:flex;justify-content:space-between;align-items:center}.question-footer span{font-size:12px;color:var(--muted)}
.grid-table,.admin-table{width:100%;border-collapse:collapse;margin:14px 0}.grid-table th,.grid-table td,.admin-table th,.admin-table td{border:1px solid var(--line);padding:10px;text-align:left}.grid-table th,.admin-table th{background:#f5f8fa}.bowtie{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}.bow-col,.group-card{border:1px solid var(--line);border-radius:10px;padding:12px;background:#fcfdfe}.bow-col h3{font-size:14px;margin:0}.bow-col p{font-size:12px;color:var(--muted)}.cloze-line{line-height:2.7}.cloze-line select{width:auto;min-width:170px}.order-list{list-style:none;padding:0}.order-item{display:grid;grid-template-columns:1fr auto auto;gap:6px;align-items:center;border:1px solid var(--line);border-radius:9px;padding:11px;margin:7px 0}.highlight-token{display:inline;line-height:2;padding:3px 4px;border-radius:5px;cursor:pointer}.highlight-token.selected{background:#bfe7e4}
.modal-bg{position:fixed;inset:0;background:rgba(10,28,42,.48);display:grid;place-items:center;padding:20px;z-index:100}.modal,.calculator{width:min(500px,100%);background:#fff;border-radius:15px;padding:26px;box-shadow:0 25px 70px rgba(0,0,0,.22)}.center{text-align:center}.modal-actions{display:flex;justify-content:flex-end;gap:8px;margin-top:20px}.break-clock{font-size:34px;font-weight:800;color:var(--navy);font-variant-numeric:tabular-nums;margin:20px}.calc-head{display:flex;justify-content:space-between}.calc-display{width:100%;font-size:24px;text-align:right;margin:10px 0}.calc-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:7px}.calc-grid button{padding:12px;border:1px solid var(--line);border-radius:8px;background:#f7fafb}.span2{grid-column:span 2}
.results-shell,.admin-shell{max-width:1080px;margin:0 auto;padding:38px 25px 70px}.results-head{padding:26px;display:flex;justify-content:space-between;gap:25px}.overall-badge{min-width:190px;padding:18px;background:#eaf6f6;border-radius:12px;text-align:center}.overall-badge strong{display:block;color:var(--navy)}.report-section{padding:22px;margin:16px 0}.metric{display:grid;grid-template-columns:minmax(190px,1fr) minmax(220px,1.5fr) 150px;gap:12px;align-items:center;padding:9px 0;border-bottom:1px solid #eef2f4}.metric-bar{height:9px;background:#edf2f4;border-radius:99px;overflow:hidden}.metric-bar span{display:block;height:100%;background:var(--teal)}.metric-level{text-align:right;font-size:13px;color:var(--muted)}.pattern-card{line-height:1.55}.result-actions{display:flex;gap:10px;justify-content:flex-end}.review-item{border:1px solid var(--line);border-radius:10px;margin:10px 0}.review-head{padding:12px 14px;background:#f7fafb;display:flex;justify-content:space-between}.review-body{padding:14px;line-height:1.5}
@media(max-width:900px){.exam-header{grid-template-columns:1fr auto}.header-center{grid-column:1/-1}.exam-layout{grid-template-columns:1fr;padding:12px}.case-panel{position:static}.bowtie{grid-template-columns:1fr}.summary-cards{grid-template-columns:1fr}.metric{grid-template-columns:1fr}.metric-level{text-align:left}}

/* Study mode additions */
.mode-box{border:1px solid var(--line);border-radius:12px;padding:14px 16px;margin:18px 0}
.mode-box legend{padding:0 6px}
.mode-option{display:flex;align-items:flex-start;gap:10px;padding:8px 0;cursor:pointer}
.mode-option input{margin-top:4px}
.mode-option span{display:flex;flex-direction:column;gap:2px}
.mode-option small{color:var(--muted,#5b7185);font-weight:400}
.mode-badge{font-size:12px;font-weight:700;letter-spacing:.03em;text-transform:uppercase;padding:4px 10px;border-radius:999px;background:#eef6f6;color:var(--teal);border:1px solid var(--teal)}
.mode-badge.study{background:#fff6e8;color:#9a6400;border-color:#e0a83e}
.feedback-modal{width:min(560px,100%)}
.feedback-badge{display:inline-block;font-size:12px;font-weight:800;letter-spacing:.04em;text-transform:uppercase;padding:5px 12px;border-radius:999px;margin-bottom:10px}
.feedback-badge.correct{background:#e7f8ee;color:#1c7c3f}
.feedback-badge.partial{background:#fff6e8;color:#9a6400}
.feedback-badge.incorrect{background:#fdecec;color:#b3261e}
.feedback-score{font-weight:700;color:var(--navy);margin:6px 0 14px}
.feedback-rationale{line-height:1.55;background:#f7fafb;border-radius:10px;padding:14px 16px}