@font-face{font-family:Source;src:url('/static/fonts/source-sans-pro-regular.woff2')}@font-face{font-family:Source;src:url('/static/fonts/source-sans-pro-600.woff2');font-weight:600}
:root{--ink:#4c2336;--muted:#806575;--paper:#fff8fa;--line:#e7d3db;--brand:#a12652;--green:var(--brand);--mint:#f6dce7;--white:#fff;--orange:#bb532d;--font:Source,'Segoe UI',sans-serif;--serif:Georgia,'Times New Roman',serif;--accent:#a12652;--bg:#fff8fa;--surface:#fbecf2;--surface2:#f2d7e2;--text:#4c2336;--text-dim:#806575;--success:#286655;--error:#ad3b32;--border-color:#e7d3db;--font-body:Source,'Segoe UI',sans-serif;--font-deriv:Source,'Segoe UI',sans-serif}
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266px;gap:22px}.practice-hero{background:#78173f;color:#fff0f4;border-radius:12px;position:relative;display:flex;min-height:285px;overflow:hidden}.hero-copy{padding:31px 31px 27px;position:relative;z-index:1;width:67%;max-width:430px}.hero-copy .eyebrow{color:#dfb2c4;font-size:9px}.hero-copy h2{font-size:35px;line-height:1.15;letter-spacing:-.6px;margin:14px 0}.hero-copy p{font-size:13px;color:#e7b6ca;max-width:300px;line-height:1.6}.hero-copy .button{font-size:13px}.hero-meta{display:block;color:#dbabc0;font-size:10px;margin-top:13px}.logic-art{position:absolute;right:0;top:0;bottom:0;width:43%;color:#ffd6e6;font:50px var(--serif);pointer-events:none;opacity:.92}.orbit{position:absolute;border:1px solid #83516a;border-radius:50%;width:225px;height:225px;right:-20px;top:7px}.orbit-two{top:77px;right:19px;width:210px;height:210px}.art-p{position:absolute;right:136px;top:42px;transform:rotate(-9deg)}.art-arrow{position:absolute;right:87px;top:122px;transform:rotate(-30deg)}.art-q{position:absolute;right:35px;top:51px;transform:rotate(10deg)}.art-therefore{position:absolute;right:67px;top:184px}.art-caption{font:7px var(--font);letter-spacing:2px;position:absolute;right:26px;bottom:20px;color:#cd86a3}.daily-card{border:1px solid var(--line);border-radius:12px;padding:24px;background:#fffdfd}.section-label{display:flex;justify-content:space-between;font-size:9px;letter-spacing:1.4px;color:var(--muted)}.section-label span{color:#a46325;font-size:18px;line-height:1}.daily-card h3{font:22px var(--serif);margin:15px 0}.daily-count{display:flex;gap:10px;align-items:baseline}.daily-count strong{font-size:33px;font-weight:400}.daily-count 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var(--line);border-radius:8px;margin-bottom:11px;padding:14px;cursor:pointer}.choice-option:has(input:checked){background:#fbe4ee;border-color:#b84270}.choice-option input{accent-color:var(--green);width:17px;height:17px}.formula-answer{width:100%;font-size:21px}.exercise-actions{display:flex;align-items:center;gap:18px;flex-wrap:wrap;margin-top:26px}.truth-table{border-collapse:collapse;width:100%;text-align:center}.truth-table th,.truth-table td{border-bottom:1px solid var(--line);padding:11px}.truth-table th{font-weight:600;background:#fbeaf0}.feedback{margin-top:25px;padding:17px;border-radius:8px;white-space:pre-wrap;font-size:14px;background:#f9e8df;color:#813e2e}.feedback.correct{background:#e4efdc;color:#2c583f}.coach-panel{border:1px solid var(--line);border-radius:11px;background:#fcf0f4;padding:21px;position:sticky;top:20px}.coach-header{display:flex;gap:12px;align-items:center}.coach-icon{font-size:29px;color:#af5578}.coach-header h2{font:18px var(--serif);letter-spacing:-.3px}.coach-header span:not(.coach-icon){font-size:10px;color:var(--muted)}.coach-intro{font-size:12px;color:var(--muted);margin:20px 0}.coach-chat{display:grid;gap:10px;max-height:390px;overflow:auto;margin:16px 0}.coach-bubble{background:#fffdfb;border:1px solid var(--line);padding:13px;border-radius:9px;font-size:13px;white-space:pre-wrap;overflow-wrap:anywhere}.coach-bubble.user{background:#f5d8e4;margin-left:22px}.coach-shortcuts{display:flex;gap:5px;flex-wrap:wrap;margin:12px 0}.coach-shortcuts button{background:none;border:1px solid #e6c0d0;font-size:10px;color:var(--green);border-radius:15px;padding:6px 9px}.coach-panel textarea{width:100%;font-size:12px;resize:vertical;min-height:75px}.coach-panel .button{width:100%;font-size:12px;padding:10px;margin-top:7px;min-height:38px}.coach-footnote{font-size:10px;color:var(--muted);margin:15px 0 0;line-height:1.6}.solution-request{font-size:10px;margin-top:9px}.proof-column{min-width:0}.proof-wrapper{background:#fffdfb;border:1px solid var(--line);border-radius:11px;padding:24px}.proof-toolbar{display:flex;justify-content:space-between;gap:15px;margin-bottom:20px}.proof-toolbar .button{font-size:12px;padding:9px 13px;min-height:35px}.proof-quickstart{padding:15px;background:#fbedf3;border-radius:8px;margin:18px 0;font-size:13px}.proof-quickstart .button-row{margin-top:10px;gap:8px}.proof-quickstart button{font-size:11px;padding:8px 10px;min-height:30px}.proof-details{margin-top:16px;border-top:1px solid var(--line);padding-top:14px}.proof-details summary{cursor:pointer;font-size:12px;font-weight:600;color:var(--muted);padding:4px 0}.proof-mode-status{padding:12px 18px;background:#e3eaf4;color:#254568;border-radius:8px;margin-bottom:20px;font-size:14px;display:flex;justify-content:space-between;gap:15px}.proof-mode-status.speedrun{background:#202d43;color:#fff1f5}.proof-mode-status strong{font-variant-numeric:tabular-nums}.mode-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}.mode-card{padding:28px;background:#fffdfb;border:1px solid var(--line);border-radius:11px}.mode-card h2{margin:12px 0}.mode-card p{color:var(--muted);font-size:14px}.mode-card.speed{background:#202d43;color:#fff1f5}.mode-card.speed p{color:#c1cbd5}.mode-card.blue{background:#eaf0f7;color:#284967}.leaderboard{width:100%;border-collapse:collapse;margin-top:25px}.leaderboard th,.leaderboard td{text-align:left;padding:13px;border-bottom:1px solid var(--line)}.leaderboard th{font-size:11px;color:var(--muted);font-weight:400}.leaderboard td:nth-child(2){letter-spacing:3px;font-weight:600}.bluebook-ui{--green:#315d87;--ink:#253e59;--paper:#f4f6f9;--mint:#dbe6f2}.speedrun-ui{--green:#354768;--ink:#202d43}.no-help .coach-panel,.no-help .proof-help-link{display:none}.no-help .exercise-layout{grid-template-columns:minmax(0,1fr)}
dialog{border:1px solid var(--line);border-radius:13px;background:var(--paper);color:var(--ink);padding:35px;max-width:500px;width:calc(100% - 30px);box-shadow:0 30px 100px #78173f22}dialog::backdrop{background:#4c233666;backdrop-filter:blur(3px)}dialog h2{margin:15px 0}dialog p{font-size:14px;color:var(--muted)}dialog label{display:block;font-size:13px;margin:15px 0 6px}dialog input{width:100%}.dialog-close{position:absolute;right:20px;top:10px;font-size:28px}.toast{position:fixed;bottom:25px;left:50%;transform:translateX(-50%);background:var(--ink);color:white;border-radius:8px;padding:13px 23px;box-shadow:0 5px 20px #0002;z-index:100;max-width:90vw}.skip-link{position:fixed;top:-80px;left:20px;z-index:1000;padding:10px;background:white}.skip-link:focus{top:10px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.mobile-account{display:none}#dashboard-error,#library-error{color:#ad3b32}#save-status{font-size:10px;letter-spacing:0}
@media(min-width:1500px){.skill-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.hero-copy{max-width:520px}.hero-copy p{max-width:380px}.logic-art{right:45px;width:260px}}
@media(max-width:1150px){.app-shell{grid-template-columns:190px minmax(0,1fr)}.sidebar{padding:27px 13px}.brand{font-size:21px}.sidebar-tag{font-size:7px}.main-content{padding:28px}.topbar{padding:18px 28px}.dashboard-top{grid-template-columns:minmax(0,1fr) 225px;gap:16px}.hero-copy{padding:25px;width:78%}.logic-art{opacity:.35;right:-30px}.skill-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.exercise-layout{grid-template-columns:minmax(0,1fr) 265px;gap:16px}.exercise-card{padding:20px}.coach-panel{padding:17px}.date-label{display:none}.exercise-heading h1{font-size:28px}}
@media(max-width:850px){.app-shell{display:block}.sidebar{position:relative;width:auto;height:auto;flex-direction:row;align-items:center;gap:25px;padding:18px 22px;border-right:0;border-bottom:1px solid var(--line)}.sidebar nav{display:flex;gap:2px;overflow:auto}.sidebar nav a{font-size:0;padding:7px}.sidebar nav a span{font-size:21px}.sidebar-tag,.sidebar-note,.account-button{display:none}.topbar{min-height:55px;padding:12px 23px}.mobile-account{display:block;font-size:12px;letter-spacing:0}.main-content{padding:25px 23px}.exercise-layout{grid-template-columns:minmax(0,1fr)}.coach-panel{position:static}.coach-chat{max-height:260px}.bottom-note{align-items:flex-start}.stats-strip>div{gap:9px}.stat-icon{font-size:21px}.stats-strip strong{font-size:20px}.app-footer{padding:17px 23px}.exercise-heading .tag{display:none}}
@media(max-width:600px){.dashboard-top{grid-template-columns:1fr}.practice-hero{min-height:278px}.hero-copy{width:74%;padding:26px}.logic-art{opacity:.55;right:10px}.hero-copy h2{font-size:32px}.daily-card{padding:20px;display:grid;grid-template-columns:1fr 1fr;gap:6px 22px}.daily-card .section-label{grid-column:1/-1}.daily-card h3{margin:10px 0}.daily-count{grid-column:2;grid-row:2;justify-self:end}.daily-card .meter{grid-column:1/-1}.daily-card p{grid-column:1/-1}.week-dots{grid-column:1/-1}.daily-card #streak-copy{grid-column:1/-1}.stats-strip{grid-template-columns:1fr 1fr;gap:23px 12px;padding:25px 0}.stats-strip>div{justify-content:flex-start;border:0}.skill-grid{gap:12px}.skill-card{padding:16px 13px}.skill-top{margin-bottom:18px}.skill-kind{font-size:7px}.skill-icon{height:33px;width:33px;font-size:21px}.skill-card h3{font-size:17px}.skill-card p{font-size:11px}.skill-status{display:none}.section-heading{align-items:center}.section-heading .text-link{font-size:11px;max-width:100px;text-align:right}.section-heading .eyebrow{font-size:8px}.filter{font-size:11px;padding:6px 9px}.filter-row{gap:2px}.bottom-note{display:block;padding:20px}.bottom-note .button{margin-top:19px}.bottom-note h3{font-size:21px}.app-footer span:last-child{display:none}.main-content{padding:24px 17px}.brand{font-size:21px}.sidebar{padding:16px 17px;gap:15px;justify-content:space-between}.topbar{padding:12px 17px;font-size:8px;letter-spacing:1px}.topbar-actions{gap:12px}.xp-pill{font-size:11px;padding:4px 10px}.page-heading .eyebrow{font-size:8px}.page-heading p{font-size:13px}.exercise-card{padding:19px 15px}.exercise-prompt{font-size:21px}.activity-row{padding:13px;gap:9px}.activity-title strong{font-size:14px}.activity-row .tag{display:none}.activity-status{font-size:10px;min-width:50px}.activity-number{min-width:18px}.mode-grid{grid-template-columns:1fr}.mode-card{padding:22px}.library-controls select{flex:1;font-size:13px;min-width:140px}.proof-wrapper{padding:15px}.exercise-heading{margin:22px 0}.exercise-heading h1{font-size:27px}.truth-table th,.truth-table td{padding:8px}.truth-table select{padding:6px}.coach-panel{margin-top:5px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
@media(max-width:600px){.sidebar{flex-wrap:wrap;gap:10px}.sidebar nav{order:3;width:100%;justify-content:space-between;overflow:visible;gap:2px}.sidebar nav .nav-link{font-size:9px;flex-direction:column;gap:3px;line-height:1.3;text-align:center;max-width:66px;flex:1;padding:8px 3px}.sidebar nav .nav-link span{font-size:19px}.mode-nav{font-size:11px;padding:7px 9px}.mode-nav span{font-size:18px}.hero-copy{width:85%}.logic-art{opacity:.3}}

@media(max-width:850px){.sidebar nav{margin-top:0}}

.account-progress{border-top:1px solid var(--line);margin-top:24px;padding-top:17px}
.account-progress>summary{cursor:pointer;font-size:14px;color:var(--muted)}
.account-progress .button-row{margin-top:15px}
.account-progress .text-button.reset-action{color:var(--error)}
.reset-confirm{margin-top:18px;padding:19px;border:1px solid var(--line);border-radius:9px;background:var(--paper)}
.reset-confirm h3{font-size:20px;margin-bottom:12px}
.reset-confirm p{font-size:14px;line-height:1.5}
.reset-confirm p.small{font-size:12px}
.reset-confirm .button.reset-action{background:var(--error);border-color:var(--error);font-size:14px}
#reset-message{margin:12px 0 0;color:var(--muted)}
#reset-message:empty{display:none}

/* Help stays quiet until the learner opens it. */
.coach-summary{cursor:pointer;font:21px var(--serif);letter-spacing:-.3px}
.coach-summary::marker{color:var(--brand)}
.coach-panel:not([open]){align-self:start}
.coach-content{padding-top:2px}

.library-controls{flex-wrap:wrap}.library-controls .search-box{flex:1 1 250px}.activity-application{border-left:3px solid var(--brand,#a12652)}

.bluebook-ui{--brand:#315d87;--brand-dark:#254568}.no-help .sidebar a[href="/help"],.no-help .sidebar a[href*="tutorial"]{display:none}

.model-table{overflow-x:auto;margin:18px 0 24px}.model-table caption{text-align:left;font-size:14px;color:var(--muted);padding:0 0 10px}.model-table .truth-table{width:auto;min-width:250px}.model-table th,.model-table td{padding:9px 18px}
.model-practice .exercise-prompt{font-size:23px;line-height:1.5}.model-practice .exercise-topline{display:none}.model-practice .model-table{margin-top:18px}.model-practice .exercise-card{padding-top:28px}

/* UI copy serves a control, instruction, result, or progress state. */
.coach-chat:empty,#continue-copy:empty{display:none}
.challenge-rules{margin-top:20px;font-size:13px;color:var(--muted)}.challenge-rules summary{cursor:pointer}.challenge-rules p{margin-top:12px;max-width:80ch}

.predicate-model{margin:18px 0}.predicate-model .model-table{overflow-x:auto;margin:12px 0}.predicate-model table{margin:0;min-width:240px}.predicate-model caption{font-size:13px;text-align:left;padding:0 0 8px}.predicate-model p{margin:10px 0}.feedback .predicate-model{white-space:normal}

.about-link{display:block;margin-top:14px;padding:4px 0;color:var(--muted);font-size:12px;text-decoration:none}.about-link:hover,.about-link[aria-current=page]{color:var(--ink);text-decoration:underline;text-underline-offset:4px}@media(max-width:850px){.about-link{margin-top:0;flex-shrink:0}}@media(max-width:600px){.about-link{margin-left:auto}}
.orientation-goal-page .about-link{display:none}