.study-shell{--study-ink:#15344a;--study-paper:#fffdf6;--study-blue:#00658d;--study-muted:#46586a;--study-green:#3c601b;--study-red:#a91018;--study-accent:#00aeef;--study-tint:#e4f6ff;color:var(--study-ink);background:var(--study-paper);background-image:radial-gradient(#15344a09 .65px,transparent 0);background-size:6px 6px;max-width:1440px;margin:auto;padding:20px clamp(18px,4vw,64px) 56px;min-height:100vh;font-family:Inter,sans-serif;font-size:15px}.study-shell[data-section=planner],.study-shell[data-section=review]{--study-accent:#8cc63f;--study-tint:#eef6da}.study-shell[data-section=achievement],.study-shell[data-section=arena]{--study-accent:#ed1c24;--study-tint:#ffede8}.study-shell[data-section=demo]{--study-accent:#00aeef;--study-tint:#f5f1e3}.study-shell *,.study-shell :after,.study-shell :before{box-sizing:border-box}.study-shell h1,.study-shell h2,.study-shell h3,.study-shell h4{font-family:Fraunces,serif;color:var(--study-ink);letter-spacing:-.025em;line-height:1.16;text-wrap:balance}.study-shell h1{font-size:clamp(2rem,4.4vw,3.6rem);margin:0;text-shadow:1px 2px 0 color-mix(in srgb,var(--study-accent) 32%,transparent)}.study-shell h1 em{font-weight:500;color:var(--study-blue)}.study-shell h2{font-size:clamp(1.6rem,2.5vw,2.25rem);margin:0 0 12px}.study-shell h3{font-size:1.35rem;margin:0 0 12px}.study-shell h4{font-size:1.1rem;margin:4px 0 8px}.study-shell p{line-height:1.65;margin:0 0 16px;max-width:70ch}.study-shell a{text-underline-offset:4px;overflow-wrap:anywhere}.study-shell button,.study-shell input,.study-shell select{font:inherit}.study-shell :focus-visible{outline:3px solid #00658d;outline-offset:4px}.study-shell ::selection{background:#8cc63f;color:#15344a}.study-shell button{cursor:pointer}.study-shell button:disabled{cursor:not-allowed;opacity:.56}.study-shell input,.study-shell select{accent-color:#00658d;caret-color:#a91018}.study-shell 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var(--study-ink);font-size:14px}.study-brand{text-decoration:none;gap:10px!important;justify-content:flex-start!important}.study-brand img{width:42px;height:42px;object-fit:contain;flex-shrink:0}.study-brand-copy{display:grid;gap:1px}.study-brand-copy strong{font-family:Fraunces,serif;font-size:20px}.study-brand-copy small{font-size:11px;color:var(--study-muted)}.study-profile-link{min-height:44px;font-weight:650}.study-page-header{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:24px 0}.study-header-copy{min-width:0}.study-page-header p{margin:10px 0 0;color:var(--study-muted);font-size:15px}.study-kicker{display:inline-flex;align-items:center;gap:8px;font-size:11px;font-weight:700;letter-spacing:.05em;text-transform:uppercase;margin-bottom:8px}.study-header-seal{display:flex;align-items:center;gap:12px;padding:18px;background:#eef6da;font-size:13px}.study-header-seal,.study-tabs{border:2px solid var(--study-ink)}.study-tabs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:0;margin:0 0 28px;background:var(--study-paper);box-shadow:4px 4px 0 var(--study-ink)}.study-tabs button{display:flex;align-items:center;justify-content:center;gap:10px;min-height:54px;padding:10px 14px;border:0;border-right:2px solid var(--study-ink);background:transparent;color:var(--study-ink);font-weight:700}.study-tabs button:last-child{border-right:0}.study-tabs button.selected{background:var(--study-accent);color:var(--study-ink);box-shadow:inset 0 -4px 0 var(--study-ink)}.study-shell[data-section=arena] .study-tabs button.selected{color:white;background:#c71922}.study-tabs button:hover:not(.selected){background:var(--study-tint)}.study-tabs button.study-tab-arena{background:#c71922;color:#fffdf6;font-weight:800}.study-tabs button.study-tab-arena:hover{background:var(--study-red)}.study-tabs button.study-tab-arena.selected{box-shadow:inset 0 -4px 0 var(--study-paper)}.study-tabs button.study-tab-arena svg{flex-shrink:0}.study-button{display:inline-flex;justify-content:center;align-items:center;gap:9px;min-height:46px;padding:11px 17px;border:2px solid var(--study-ink);background:var(--study-accent);color:var(--study-ink);box-shadow:3px 3px 0 var(--study-ink);font-weight:750;text-decoration:none;line-height:1.4;transition:transform .14s cubic-bezier(.23,1,.32,1),box-shadow .14s cubic-bezier(.23,1,.32,1)}.study-shell[data-section=achievement] .study-button:not(.study-button-secondary),.study-shell[data-section=arena] .study-button:not(.study-button-secondary){background:#c71922;color:white}.study-button:hover:not(:disabled){transform:translate(-1px,-1px);box-shadow:4px 4px 0 var(--study-ink)}.study-button:active:not(:disabled){transform:translate(2px,2px);box-shadow:1px 1px 0 var(--study-ink)}.study-button-secondary{background:var(--study-paper);box-shadow:2px 2px 0 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var(--study-ink);border-bottom:2px solid var(--study-ink);background:#e4f6ff;margin-bottom:26px}.study-brief-stat{display:flex;align-items:center;gap:10px;padding:16px 24px;flex:1;border-right:1px solid #15344a55}.study-brief-stat:last-child{border-right:0}.study-brief-stat strong{font-family:IBM Plex Mono,monospace;font-size:24px;font-variant-numeric:tabular-nums}.study-brief-stat small,.study-brief-stat span{font-size:12px;line-height:1.5}.study-desk{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(0,1fr);gap:32px;align-items:start}.study-day-sheet{background:#e4f6ff!important;position:relative}.study-sheet-title{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-bottom:20px}.study-sheet-title h3{margin:0}.study-sheet-title>span{font-family:IBM Plex Mono,monospace;font-size:12px;white-space:nowrap}.study-shell progress{display:block;width:100%;height:11px;border:1px solid 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span{color:var(--study-muted);margin-left:auto}.study-side-desk{display:flex;flex-direction:column;gap:28px;min-width:0}.study-resume{background:#fff2d6!important}.study-resume .study-button{margin-top:4px}.study-recall{padding:22px;border:2px solid var(--study-ink);background:#eef6da;box-shadow:4px 4px 0 #8cc63f}.study-recall-link{display:flex;justify-content:space-between;align-items:center;gap:14px;padding:16px 0;border-bottom:1px solid #15344a44;text-decoration:none;color:var(--study-ink)}.study-recall-link small{display:block;color:var(--study-muted);margin-top:5px;font-size:13px}.study-rebalance{background:#eef6da;padding:20px;border:2px dashed #3c601b}.study-setup-card{padding:12px 0}.study-setup-card>svg{color:#00658d;margin-bottom:16px}.study-setup-card ol{padding-left:22px;margin:16px 0 22px;line-height:1.9;font-size:14px}.study-upcoming{margin-top:36px}.study-arena-invite{display:flex;align-items:center;gap:22px;background:#ffede8;border:2px solid var(--study-ink);box-shadow:5px 5px 0 #ed1c24;margin-top:36px;padding:24px}.study-arena-invite>svg{flex-shrink:0;color:#a91018}.study-arena-invite h3{margin-bottom:6px}.study-arena-invite p{margin:0;font-size:14px}.study-arena-invite .study-button{flex-shrink:0;margin-left:auto;background:#c71922;color:white}.study-footer{margin-top:42px;padding-top:20px;border-top:2px solid var(--study-ink);font-size:12px;color:var(--study-muted)}.study-planner-toolbar{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:12px;padding:16px 20px;background:#eef6da;border:2px solid var(--study-ink);margin-bottom:24px;font-size:13px}.study-planner-toolbar>div,.study-planner-toolbar>span{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.study-planner-layout{display:grid;grid-template-columns:320px minmax(0,1fr);gap:32px}.study-planner-form{align-self:start;background:#eef6da!important}.study-planner-form-head{margin-bottom:24px;padding-bottom:16px;border-bottom:2px solid 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var(--study-ink);padding:16px;background:#fffdf6;min-width:0}.study-calendar-day.is-today{background:#eef6da;box-shadow:3px 3px 0 #8cc63f}.study-calendar-day h4{font-size:1.1rem;margin:0 0 8px}.study-calendar-day h4>span,.study-calendar-day>span{display:inline-block;font-size:10px;font-family:Inter,sans-serif;background:#8cc63f;padding:3px 6px;margin-left:8px}.study-calendar-day a{display:block;padding:12px 0;text-decoration:none;border-bottom:1px solid #15344a33;font-size:13px;font-weight:650}.study-calendar-day a span{display:flex;gap:4px;align-items:center}.study-calendar-day small{display:block;font-weight:400;color:var(--study-muted);margin-top:6px;font-size:12px}.study-calendar-day p{margin:14px 0 0}.study-planner-explanation{margin-top:36px;padding:24px;background:#eef6da;border-top:2px solid var(--study-ink)}.study-planner-explanation>div,.study-planner-principles{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}.study-planner-explanation 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var(--study-ink)}.study-timer.urgent{color:#a91018;background:#ffede8;border-color:#a91018}.study-duel-question{font-size:clamp(1.4rem,2.5vw,2rem)!important;margin:24px 0!important}.study-answer-list{display:grid;gap:12px;margin:24px 0}.study-answer-list button{display:flex;align-items:center;gap:14px;text-align:left;background:#fffdf6;border:2px solid var(--study-ink);padding:14px;color:var(--study-ink);min-height:56px;line-height:1.5}.study-answer-list button>span{font-family:IBM Plex Mono,monospace;display:flex;align-items:center;justify-content:center;min-width:32px;min-height:32px;background:#f0ebdd;border:1px solid #15344a44}.study-answer-list button[aria-pressed=true]{background:#e4f6ff;border-color:#00658d;box-shadow:3px 3px 0 #00658d}.study-duel>.study-muted{margin-top:18px}.study-duel-exit{margin-top:24px;border-top:1px solid #15344a44;padding-top:18px}.study-duel-exit summary{color:var(--study-muted);cursor:pointer;min-height:44px}.study-duel-exit 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