@import url('https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@400;500;600;700;800&display=swap');
:root{--bg:#f3f6fa;--paper:#fff;--ink:#203047;--muted:#526477;--line:#d9e2ec;--green:#0f766e;--green-dark:#16394a;--mint:#e8f5f2;--lime:#b9f0df;--amber:#855516;--red:#b42332;--radius:20px;--shadow:0 8px 30px #23473506}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;background:var(--bg);font-family:'Be Vietnam Pro',system-ui,-apple-system,sans-serif;color:var(--ink);font-size:1.0625rem;line-height:1.6}button,input,select,textarea{font:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:default;opacity:.5}a{color:inherit;text-decoration:none}button{color:inherit}svg.icon{width:21px;height:21px;stroke:currentColor;stroke-width:1.7;fill:none;stroke-linecap:round;stroke-linejoin:round;vertical-align:middle;flex-shrink:0}h1,h2,h3,p{margin:0}h1{font-size:1.875rem;line-height:1.4;letter-spacing:-1px}h2{font-size:1.25rem;line-height:1.5;letter-spacing:-.5px}h3{font-size:1.25rem;line-height:1.5}button:focus-visible,a:focus-visible,summary:focus-visible,select:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid #b19447;outline-offset:4px}.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip-link{position:fixed;top:-100px;left:15px;z-index:100;background:white;padding:12px}.skip-link:focus{top:10px}
.site-sidebar{position:fixed;inset:0 auto 0 0;width:232px;background:#fff;border-right:1px solid var(--line);display:flex;flex-direction:column;padding:30px 20px;z-index:30}.brand{display:flex;gap:10px;align-items:center;font-size:1.3125rem;font-weight:800;letter-spacing:-1px;margin-bottom:42px}.brand b{font-weight:400}.brand small{display:block;letter-spacing:1.5px;font-size:0.75rem;color:var(--muted);margin-top:2px}.brand-mark{display:grid;place-items:center;width:39px;height:43px;background:var(--green-dark);color:var(--lime);font-size:1.9375rem;line-height:1;border-radius:14px 14px 14px 4px}.nav-label,.eyebrow{font-size:0.875rem;font-weight:700;letter-spacing:1.8px;color:#526477}.nav-label{padding-left:14px;margin-bottom:13px}.main-nav{display:grid;gap:8px}.main-nav a{display:flex;align-items:center;gap:12px;padding:13px 14px;border-radius:11px;color:#526477;font-size:1.0625rem;font-weight:500;transition:.18s}.main-nav a:hover{background:#f5f7f0}.main-nav a.active{background:#eaf3e7;color:#245c47;font-weight:700}.main-nav small{margin-left:auto;font-size:0.8125rem;border:1px solid #dce5d5;border-radius:5px;padding:1px 5px}.sidebar-tip{margin-top:auto;background:#f3f6ec;padding:20px;border-radius:16px;position:relative;overflow:hidden}.sidebar-tip>span{color:#526477}.sidebar-tip strong{display:block;margin:12px 0 8px;font-size:1.3125rem;line-height:1.5;letter-spacing:-.5px}.sidebar-tip p{font-size:0.875rem;color:#526477;line-height:1.9}.sidebar-tip a{font-size:0.875rem;font-weight:700;display:flex;justify-content:space-between;margin-top:19px}.sidebar-bottom{display:flex;gap:6px;align-items:center;font-size:0.8125rem;color:#526477;margin-top:22px}.status-dot{width:5px;height:5px;border-radius:50%;background:#77a377;display:inline-block;flex-shrink:0}.site-body{margin-left:232px}.topbar{height:83px;padding:0 38px;display:flex;align-items:center;gap:20px;border-bottom:1px solid var(--line);background:#f9faf5ed;position:sticky;top:0;z-index:20;backdrop-filter:blur(15px)}.breadcrumb{display:flex;gap:13px;font-size:1.0rem;align-items:center;color:#526477}.breadcrumb strong{font-weight:500;color:#3b5548}.course-picker{margin-left:auto;display:flex;gap:9px;align-items:center;background:white;padding:8px 12px;border:1px solid var(--line);border-radius:9px;color:#526477}.course-picker .icon{width:17px;height:17px}.course-picker select{border:0;background:transparent;font-size:1.0rem;max-width:220px;color:var(--ink);padding-right:4px;cursor:pointer}.avatar{width:32px;height:32px;background:#efe9d8;border-radius:50%;display:grid;place-items:center;color:#526477;font-size:0.875rem;font-weight:700}main{max-width:1360px;margin:auto;padding:32px 38px 50px;min-height:calc(100vh - 150px)}main:focus{outline:none}.site-footer{display:flex;justify-content:space-between;gap:16px;padding:0 38px 25px;font-size:0.8125rem;color:#526477}.page-heading{display:flex;justify-content:space-between;align-items:end;gap:20px;margin-bottom:26px}.page-heading .eyebrow{margin-bottom:7px}.page-heading p{font-size:1.0625rem;color:var(--muted);margin-top:9px;max-width:680px;line-height:1.9}.page-heading .head-actions{flex-shrink:0}.btn{display:inline-flex;align-items:center;justify-content:center;gap:9px;padding:12px 17px;border:1px solid transparent;border-radius:10px;font-size:1.0rem;font-weight:600;line-height:1.5;transition:background .18s,transform .18s}.btn .icon{width:16px;height:16px}.btn-primary{background:var(--green);color:#fff}.btn-primary:hover{background:#164e40;transform:translateY(-1px)}.btn-lime{background:var(--lime);color:#284d35}.btn-lime:hover{background:#e6f6c4}.btn-light{background:#eef2e8;color:#4e6957}.btn-light:hover{background:#e4ebdb}.btn-outline{background:white;border-color:var(--line)}.btn-outline:hover{border-color:#9eb49f}.btn-small{padding:8px 12px;font-size:0.875rem}.text-link{border:0;background:none;padding:0;font-size:1.0rem;font-weight:600;color:var(--green);display:inline-flex;gap:6px;align-items:center}.text-link .icon{width:15px;height:15px}.subtle{color:var(--muted)}.pill{display:inline-flex;align-items:center;gap:6px;border-radius:7px;padding:5px 8px;background:#eef3e8;color:#526477;font-size:0.8125rem;white-space:nowrap}.pill.amber{color:#526477;background:#f8efdf}.pill.neutral{background:#f0f3f0;color:#526477}.pill.green{background:#e8f6ec;color:#526477}.card{background:var(--paper);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.home-hero{background:var(--green-dark);border-radius:25px;display:grid;grid-template-columns:1.4fr 1fr;position:relative;overflow:hidden;padding:37px 39px;color:#fff;min-height:305px}.home-hero::before{content:'';position:absolute;inset:0;background-image:radial-gradient(#d8eabf25 1px,transparent 1px);background-size:21px 21px;mask-image:linear-gradient(90deg,transparent,#000);pointer-events:none}.hero-copy{position:relative;z-index:1}.hero-copy .eyebrow{color:#bdcfa9;font-size:0.8125rem;display:flex;align-items:center;gap:7px}.hero-copy h1{font-size:2.1875rem;line-height:1.35;letter-spacing:-1.2px;margin:17px 0 12px}.hero-copy h1 em{color:var(--lime);font-style:normal}.hero-copy>p{font-size:1.0rem;line-height:1.9;color:#b9d0c3;max-width:430px;margin-bottom:21px}.hero-art{position:relative;display:grid;place-items:center}.hero-orbit{position:absolute;width:245px;height:245px;border:1px solid #c8e0a730;border-radius:50%}.hero-orbit::after{content:'';position:absolute;inset:-27px;border:1px dashed #c8e0a725;border-radius:50%}.hero-note{width:184px;background:#f5f8e7;color:#2e533f;border-radius:14px;padding:20px;transform:rotate(8deg);box-shadow:-18px 12px 0 #a1c28f;font-size:0.875rem;position:relative}.hero-note .note-label{font-size:0.375rem;letter-spacing:1px;color:#526477}.hero-note strong{font-size:1.5625rem;line-height:1.2;display:block;margin:15px 0 20px;letter-spacing:-1px}.note-check{display:flex;gap:8px;align-items:center;background:#e6edd8;margin-top:7px;padding:7px;border-radius:5px}.note-check span{width:70px;height:4px;border-radius:5px;background:#bdcfae}.note-check:last-child{opacity:.55}.hero-star{position:absolute;right:10%;top:5%;font-size:2.0625rem;color:var(--lime)}.hero-float{position:absolute;right:2%;bottom:3%;transform:rotate(-5deg);padding:12px 16px;background:#fff;color:#526477;border-radius:9px;font-size:0.8125rem;box-shadow:0 6px 20px #0002}.home-stats{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:21px 0 30px}.stat-card{padding:19px 22px;display:flex;align-items:center;gap:15px}.stat-icon{width:42px;height:42px;border-radius:12px;background:#edf3e8;color:#526477;display:grid;place-items:center}.stat-card:nth-child(2) .stat-icon{background:#faf0df;color:#526477}.stat-card:nth-child(3) .stat-icon{background:#eaf0ef;color:#526477}.stat-card strong{font-size:1.5rem;line-height:1.1;letter-spacing:-.8px}.stat-card small{display:block;color:var(--muted);font-size:0.8125rem;margin-top:5px}.section-title{display:flex;align-items:center;justify-content:space-between;gap:15px;margin:26px 0 16px}.section-title h2{font-size:1.3125rem}.section-title p{font-size:0.875rem;color:var(--muted);margin-top:3px}.mode-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.mode-card{padding:23px;position:relative;display:flex;flex-direction:column;align-items:flex-start}.mode-card .mode-icon{width:43px;height:43px;border-radius:12px;display:grid;place-items:center;background:#e9f2e7;color:#526477;margin-bottom:20px}.mode-card:nth-child(2) .mode-icon{background:#f8edde;color:#526477}.mode-card:nth-child(3) .mode-icon{background:#e9efee;color:#526477}.mode-card .index{position:absolute;right:22px;top:23px;color:#dde5d8;font-size:1.625rem;letter-spacing:-1px}.mode-card h3{font-size:1.25rem;margin-bottom:8px}.mode-card p{font-size:0.875rem;color:var(--muted);line-height:1.9;margin-bottom:22px}.mode-card .text-link{margin-top:auto}.bottom-grid{display:grid;grid-template-columns:1.1fr 1fr;gap:20px}.roadmap{padding:22px}.roadmap-item{display:flex;gap:13px;align-items:center;padding:12px 0;border-bottom:1px solid #edf0e9}.roadmap-item:last-child{border:0}.roadmap-number{border:1px solid #dfe7d8;border-radius:9px;width:30px;height:30px;display:grid;place-items:center;font-size:1.0rem;flex-shrink:0}.roadmap-item strong{font-size:1.0rem;font-weight:600}.roadmap-item small{display:block;font-size:0.8125rem;color:var(--muted);margin-top:2px}.roadmap-item>a{margin-left:auto;color:#526477}.history-card{padding:22px}.empty{padding:25px;text-align:center;color:var(--muted);font-size:1.0625rem;line-height:1.9}.empty .icon{width:30px;height:30px;margin-bottom:12px;color:#526477}.history-row{display:flex;align-items:center;justify-content:space-between;gap:14px;padding:13px 0;border-bottom:1px solid #edf0e9}.history-row:last-child{border:0}.history-row strong{display:block;font-size:1.0rem}.history-row small{font-size:0.8125rem;color:var(--muted)}.history-score{font-size:1.3125rem;font-weight:700;color:var(--green)}.resume-banner{display:flex;justify-content:space-between;align-items:center;gap:20px;border:1px solid #cfdec6;background:#edf5e5;padding:16px 20px;border-radius:14px;margin:0 0 22px}.resume-banner strong{font-size:1.0625rem}.resume-banner p{font-size:0.875rem;color:#526477;margin-top:3px}.resume-banner>div:last-child{display:flex;gap:8px;flex-wrap:wrap}
.searchbox{display:flex;align-items:center;gap:10px;background:#fff;border:1px solid var(--line);border-radius:11px;padding:12px 15px}.searchbox .icon{width:17px;height:17px;color:#526477}.searchbox input{border:0;outline:none;width:100%;min-width:0;background:none;color:var(--ink);font-size:1.0rem}.study-toolbar{display:flex;gap:15px;align-items:center;margin-bottom:20px}.study-toolbar .searchbox{flex:1}.study-toolbar .pill{padding:9px 12px}.lesson-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:17px}.lesson-card{padding:24px;display:flex;flex-direction:column}.lesson-card h2{font-size:1.3125rem;margin:13px 0 8px}.lesson-card p{font-size:1.0rem;line-height:1.9;color:var(--muted);margin-bottom:15px}.lesson-card .lesson-card-top{display:flex;justify-content:space-between;align-items:center}.lesson-number{font-size:0.875rem;font-weight:700;letter-spacing:1.5px;color:#526477}.tags{display:flex;flex-wrap:wrap;gap:6px;margin-bottom:20px}.tag{font-size:0.8125rem;background:#f4f6f0;border-radius:5px;padding:4px 7px;color:#526477}.lesson-card-footer{display:flex;justify-content:space-between;gap:10px;align-items:center;border-top:1px solid #edf0e7;padding-top:16px;margin-top:auto}.lesson-card-footer small{font-size:0.8125rem;color:var(--muted)}.lesson-layout{display:grid;grid-template-columns:210px minmax(0,1fr);gap:24px;align-items:start}.lesson-toc{position:sticky;top:107px;padding:20px}.lesson-toc .eyebrow{font-size:0.8125rem;margin-bottom:14px}.lesson-toc a{display:flex;gap:10px;font-size:0.875rem;line-height:1.7;padding:10px 9px;color:#526477;border-radius:8px}.lesson-toc a.active{background:#edf4e6;color:#305f3d;font-weight:600}.lesson-toc a span{flex-shrink:0;color:#526477}.lesson-toc a:hover{background:#f3f6ed}.lesson-toc .toc-summary{border-top:1px solid var(--line);margin-top:15px;padding-top:16px;font-size:0.8125rem;color:var(--muted)}.lesson-article{min-width:0}.article-top{padding:30px;background:#fff;border:1px solid var(--line);border-radius:20px;margin-bottom:18px}.article-top h1{font-size:1.6875rem;margin:11px 0}.article-top p{color:var(--muted);font-size:1.0625rem;line-height:1.9}.article-meta{display:flex;gap:8px;flex-wrap:wrap;margin:17px 0}.article-actions{display:flex;flex-wrap:wrap;gap:9px}.takeaway{background:#edf4e5;padding:20px 22px;border-left:3px solid #86aa63;border-radius:0 12px 12px 0;margin-bottom:21px}.takeaway strong{font-size:0.875rem;color:#526477;text-transform:uppercase;letter-spacing:1px}.takeaway p{margin-top:7px;font-size:1.0625rem;line-height:1.9;color:#4d6544}.learning-section{padding:25px 28px;margin:15px 0;background:#fff;border:1px solid var(--line);border-radius:17px}.learning-section h2{font-size:1.3125rem;margin-bottom:15px;display:flex;align-items:baseline;gap:10px}.learning-section h2>span{color:#526477;font-size:1.0625rem;letter-spacing:-.2px}.learning-section ul{margin:0;padding-left:19px;font-size:1.0625rem;color:#526477;line-height:2}.learning-section li+li{margin-top:9px}.table-wrap{max-width:100%;overflow:auto;margin:15px 0 6px;border:1px solid var(--line);border-radius:10px}table{width:100%;border-collapse:collapse;font-size:1.0rem;text-align:left;line-height:1.9}th{background:#f2f5ed;color:#526477;font-weight:600}th,td{padding:12px 14px;border-bottom:1px solid #e8ede2;vertical-align:top}td:first-child{font-weight:600;color:#3a5b43}tr:last-child td{border-bottom:0}table+ul,.table-wrap+ul{margin-top:15px!important}.steps{list-style:none;padding:0;margin:0;counter-reset:steps;display:grid;gap:10px}.steps li{counter-increment:steps;display:flex;align-items:center;gap:12px;font-size:1.0625rem;padding:10px 12px;background:#f6f8f2;border-radius:9px;margin:0}.steps li::before{content:counter(steps);display:grid;place-items:center;flex-shrink:0;width:26px;height:26px;border-radius:50%;background:#e4edd8;color:#526477;font-size:0.875rem;font-weight:700}.pitfalls{background:#fffcf4;border-color:#ede4d2}.pitfalls h2{color:#526477}.pitfalls ul{color:#526477}.self-check details{border:1px solid var(--line);border-radius:10px;margin-top:12px;padding:14px 17px}.self-check summary{font-size:1.0625rem;font-weight:600;cursor:pointer}.self-check details p{font-size:1.0625rem;color:var(--muted);line-height:1.9;padding-top:13px}.self-check>p{font-size:1.0rem;color:var(--muted)}.note-box textarea{display:block;width:100%;resize:vertical;min-height:130px;padding:15px;border:1px solid var(--line);border-radius:11px;background:#fafbf7;font-size:1.0625rem;color:#456048;line-height:1.9}.note-box small{display:block;font-size:0.8125rem;color:#526477;margin-top:8px}.source-links{display:flex;flex-wrap:wrap;gap:7px;margin-top:12px}.source-links a{font-size:0.8125rem;background:#edf2e7;padding:5px 8px;border-radius:5px;color:#526477}.source-heading{font-size:1.0rem;line-height:1.8;color:#526477}.related-question{padding:13px 0;border-bottom:1px solid var(--line);font-size:1.0rem;color:#526477}.related-question:last-child{border:0}.related-question>span{color:#526477;margin-right:8px}.related-question p{margin:5px 0 0 24px;font-size:0.875rem;color:#526477}.lesson-bottom{display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;padding:20px 0}
.mode-intro{display:grid;grid-template-columns:1.3fr 1fr;gap:24px}.launch-card{padding:31px}.launch-card h2{font-size:1.5rem;margin:18px 0 10px}.launch-card>p{font-size:1.0625rem;color:var(--muted);line-height:1.9}.launch-facts{display:flex;gap:26px;margin:25px 0;padding:20px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.launch-facts strong{font-size:1.5625rem;font-weight:700;line-height:1.2;display:block;color:#365b44}.launch-facts span{font-size:0.8125rem;color:var(--muted)}.launch-controls{display:flex;flex-direction:column;align-items:flex-start;gap:15px;margin-bottom:24px}.launch-controls label{font-size:1.0rem;display:flex;align-items:center;gap:9px;color:#526477}.launch-controls select{padding:10px 12px;width:100%;border:1px solid var(--line);border-radius:8px;background:#fafbf7;font-size:1.0rem;color:#4f6849}.launch-controls input{accent-color:var(--green);width:15px;height:15px}.info-card{padding:27px;background:#eef3e7;border:1px solid #dee7d5;border-radius:20px}.info-card h3{margin-bottom:22px}.info-step{display:flex;gap:13px;margin:20px 0}.info-step>span{width:29px;height:29px;border-radius:50%;background:#dfe9d2;display:grid;place-items:center;flex-shrink:0;font-size:0.875rem;color:#526477}.info-step strong{display:block;font-size:1.0625rem;margin-bottom:4px}.info-step p{font-size:1.0rem;color:#526477;line-height:1.9}.mode-note{font-size:0.875rem;padding-top:16px;border-top:1px solid #dbe5d0;color:#526477;line-height:1.8}
.session-heading{display:flex;justify-content:space-between;align-items:center;gap:14px;margin-bottom:22px}.session-heading h1{font-size:1.4375rem;margin-top:8px}.session-heading p{font-size:0.875rem;color:var(--muted);margin-top:5px}.session-actions{display:flex;align-items:center;gap:12px}.clock{display:flex;align-items:center;gap:7px;font-size:1.0625rem;color:#526477;font-variant-numeric:tabular-nums}.clock .icon{width:16px;height:16px}.session-layout{display:grid;grid-template-columns:minmax(0,1fr) 249px;gap:22px;align-items:start}.question-card{padding:28px}.question-meta{display:flex;justify-content:space-between;align-items:center;gap:12px}.question-count{font-size:0.875rem;color:#526477;background:#eef5e9;padding:7px 10px;border-radius:7px;font-weight:600}.question-topic{font-size:0.875rem;color:#526477}.question-title{font-size:1.3125rem;line-height:1.9;margin:26px 0;font-weight:600;letter-spacing:-.2px;overflow-wrap:anywhere}.answer-list{display:grid;gap:11px}.answer{width:100%;text-align:left;border:1px solid var(--line);border-radius:12px;background:#fff;padding:15px;display:flex;align-items:flex-start;gap:12px;font-size:1.0625rem;line-height:1.8;transition:background .18s,border-color .18s}.answer-letter{display:grid;place-items:center;flex-shrink:0;width:29px;height:29px;font-size:1.0rem;font-weight:700;color:#526477;background:#f0f4eb;border-radius:8px}.answer-text{padding-top:3px;flex:1;min-width:0;overflow-wrap:anywhere}.answer:not(:disabled):hover{background:#f8fbf4;border-color:#95b08b}.answer:disabled{opacity:1}.answer.selected{border-color:#5d8c70;background:#edf5e9}.answer.selected .answer-letter{background:#3d765b;color:white}.answer.correct{border-color:#78b492;background:#eff9f1}.answer.correct .answer-letter{background:#36845b;color:white}.answer.wrong{border-color:#d6a2a2;background:#fff4f2}.answer.wrong .answer-letter{background:#be6262;color:white}.answer-state{font-size:1.3125rem;font-weight:700;padding-top:2px}.correct .answer-state{color:#526477}.wrong .answer-state{color:#526477}.answer-feedback{font-size:1.0rem;line-height:1.9;border:1px solid #c6e1cd;background:#f0f8ee;border-radius:10px;margin-top:18px;padding:15px 17px;color:#526477}.answer-feedback.wrong{border-color:#eccfc9;background:#fff6f2;color:#526477}.answer-feedback strong{display:block;margin-bottom:4px}.answer-feedback .text-link{margin-top:8px}.source-note{font-size:0.875rem;margin-top:9px;color:#526477}.neutral-feedback{font-size:0.875rem;color:#526477;margin-top:13px;display:flex;align-items:center;gap:6px}.question-nav{display:flex;justify-content:space-between;align-items:center;gap:10px;border-top:1px solid #edf0e7;margin-top:26px;padding-top:20px}.question-tools{display:flex;gap:8px;margin:20px 0 0}.flag-button{border:1px solid var(--line);background:white;border-radius:7px;padding:7px 9px;font-size:0.8125rem;display:inline-flex;align-items:center;gap:5px;color:#526477}.flag-button .icon{width:14px;height:14px}.flag-button.flagged{background:#fff5d9;border-color:#e4cf92;color:#526477}.session-sidebar{padding:22px;position:sticky;top:105px}.progress-title{display:flex;align-items:center;justify-content:space-between;gap:8px;font-size:1.0rem}.progress-title span{font-size:0.875rem;color:#526477}.progress-track{height:5px;background:#ebf0e4;border-radius:10px;overflow:hidden;margin:12px 0 22px}.progress-track>span{display:block;height:100%;background:#83a96b;border-radius:10px;transition:width .2s}.session-stat-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-bottom:23px}.session-stat{border-radius:10px;padding:13px 7px;text-align:center;background:#f1f5eb}.session-stat strong{display:block;font-size:1.3125rem;line-height:1.3;color:#526477}.session-stat small{font-size:0.8125rem;color:#526477}.session-stat.good{background:#edf8ee}.session-stat.good strong{color:#526477}.session-stat.bad{background:#fff1ed}.session-stat.bad strong{color:#526477}.palette-heading{font-size:0.8125rem;letter-spacing:1px;color:#526477;margin-bottom:10px;font-weight:600}.palette{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:7px;max-height:285px;overflow:auto;padding:4px;margin:-4px}.palette-button{position:relative;aspect-ratio:1;min-width:0;border:1px solid #e2e8dc;background:#f7f9f2;border-radius:7px;font-size:0.8125rem;color:#526477}.palette-button.active{outline:2px solid #4e7d5e;outline-offset:1px}.palette-button.answered{background:#dcebd4;color:#456341;border-color:#bbd1ac}.palette-button.good{background:#4f8a63;border-color:#4f8a63;color:#fff}.palette-button.bad{background:#bf766b;border-color:#bf766b;color:#fff}.palette-button.flagged::after{content:'';position:absolute;right:2px;top:2px;width:6px;height:6px;border-radius:50%;background:#e8b84d;border:1px solid #fff}.palette-legend{display:flex;gap:9px;flex-wrap:wrap;font-size:0.8125rem;color:#526477;margin:15px 0 20px}.palette-legend span{display:flex;align-items:center;gap:4px}.palette-legend i{width:6px;height:6px;background:#dce4d5;border-radius:50%}.palette-legend .answered{background:#9cbd83}.palette-legend .flagged{background:#e8b84d}.palette-legend .good{background:#4f8a63}.palette-legend .bad{background:#bf766b}.session-sidebar>.btn{width:100%}.session-disclaimer{font-size:0.8125rem;line-height:1.9;color:#526477;text-align:center;margin-top:12px}.result-hero{background:white;padding:32px;border:1px solid var(--line);border-radius:22px;display:grid;grid-template-columns:170px 1fr;align-items:center;gap:35px;margin-bottom:22px}.score-ring{height:160px;width:160px;border-radius:50%;background:conic-gradient(#6b9c75 var(--score),#edf1e5 0);display:grid;place-items:center}.score-ring>div{height:137px;width:137px;border-radius:50%;background:#fff;display:flex;flex-direction:column;align-items:center;justify-content:center}.score-ring strong{font-size:2.4375rem;letter-spacing:-2px;line-height:1.3}.score-ring small{font-size:0.875rem;color:#526477}.result-copy h1{font-size:1.625rem;margin:8px 0}.result-copy>p{font-size:1.0rem;color:var(--muted);line-height:1.9}.result-numbers{display:flex;flex-wrap:wrap;gap:24px;margin:22px 0}.result-numbers strong{font-size:1.25rem;display:block}.result-numbers span{font-size:0.8125rem;color:#526477}.result-actions{display:flex;gap:9px;flex-wrap:wrap}.review-toolbar{display:flex;justify-content:space-between;align-items:center;gap:15px;margin:27px 0 17px}.review-filters{display:flex;gap:5px;background:#eaf0e2;border-radius:9px;padding:4px;flex-wrap:wrap}.review-filters button{background:none;border:0;border-radius:6px;padding:7px 10px;color:#526477;font-size:0.875rem}.review-filters button.active{background:#fff;color:#45673f;box-shadow:0 2px 5px #36552c09}.review-item{padding:23px;margin-bottom:13px}.review-item h3{font-size:1.0625rem;line-height:1.9;margin:12px 0}.review-top{display:flex;justify-content:space-between;gap:10px;font-size:0.8125rem;color:#526477}.review-item .review-answer{font-size:1.0rem;line-height:1.9;padding:9px 12px;border-radius:7px;background:#f4f7ef;margin:7px 0}.review-answer.right{background:#edf6eb;color:#526477}.review-answer.incorrect{background:#fff3ed;color:#526477}.review-item .text-link{margin-top:8px}.topic-breakdown{padding:24px}.topic-row{display:grid;grid-template-columns:1fr 110px 50px;align-items:center;gap:12px;font-size:1.0rem;margin-top:17px}.topic-row .progress-track{margin:0}.topic-row>span:last-child{text-align:right;font-size:0.875rem;color:var(--muted)}dialog{border:1px solid var(--line);border-radius:21px;padding:30px;max-width:450px;width:calc(100% - 32px);box-shadow:0 20px 100px #12382b22;color:var(--ink)}dialog::backdrop{background:#173d3655;backdrop-filter:blur(3px)}dialog h2{font-size:1.375rem;margin:16px 0 12px}dialog p{font-size:1.0625rem;line-height:1.9;color:var(--muted)}.dialog-icon{color:#526477;background:#edf5e5;width:42px;height:42px;border-radius:12px;display:grid;place-items:center}.dialog-actions{display:flex;justify-content:flex-end;gap:9px;margin-top:25px}#toast{position:fixed;bottom:24px;left:calc(50% + 100px);transform:translateX(-50%);padding:11px 18px;background:#214d3f;color:white;border-radius:9px;font-size:1.0rem;box-shadow:0 5px 30px #19352b26;z-index:100;opacity:0;pointer-events:none;transition:opacity .2s;max-width:calc(100% - 40px);text-align:center}#toast.visible{opacity:1}
@media(min-width:1500px){main{padding-top:40px}.home-hero{min-height:330px}.hero-copy h1{font-size:2.4375rem}}
@media(max-width:1150px){.site-sidebar{width:204px;padding:25px 15px}.site-body{margin-left:204px}.topbar{padding:0 25px}main{padding:27px 25px 40px}.site-footer{padding-left:25px;padding-right:25px}.hero-copy h1{font-size:1.875rem}.home-hero{padding:30px}.hero-art{transform:scale(.86)}.mode-card{padding:20px}.session-layout{grid-template-columns:minmax(0,1fr) 220px;gap:15px}.session-sidebar{padding:18px}.lesson-layout{grid-template-columns:180px minmax(0,1fr);gap:18px}.lesson-toc{padding:16px}.question-card{padding:23px}.mode-intro{gap:18px}.launch-card{padding:25px}}
@media(max-width:960px){.site-sidebar{position:sticky;top:0;width:100%;height:auto;flex-direction:row;align-items:center;gap:20px;padding:12px 22px;border-right:0;border-bottom:1px solid var(--line)}.brand{margin:0;font-size:1.3125rem;gap:8px}.brand-mark{width:31px;height:35px;font-size:1.625rem}.brand small{font-size:0.6875rem}.nav-label,.sidebar-tip,.sidebar-bottom{display:none}.main-nav{display:flex;gap:5px;margin-left:auto}.main-nav a{padding:10px;font-size:1.0rem;gap:7px}.main-nav small{display:none}.main-nav .icon{width:17px;height:17px}.site-body{margin:0}.topbar{top:60px;height:62px}.site-footer{font-size:0.8125rem}.lesson-toc,.session-sidebar{top:145px}.breadcrumb{font-size:0.875rem}.avatar{display:none}.lesson-layout{grid-template-columns:180px minmax(0,1fr)}.home-hero{grid-template-columns:1.3fr 1fr}.mode-card p{font-size:0.875rem}#toast{left:50%}html{scroll-padding-top:145px}}
@media(max-width:720px){.site-sidebar{flex-wrap:wrap;gap:10px;padding:12px 17px 9px}.brand small{display:none}.brand{font-size:1.375rem}.main-nav{width:100%;justify-content:space-between;gap:5px}.main-nav a{flex:1;justify-content:center;font-size:0.875rem;padding:9px 5px;gap:5px}.main-nav .icon{width:15px;height:15px}.topbar{position:relative;top:0;height:58px;padding:0 18px;gap:8px}.breadcrumb{gap:6px;font-size:0.8125rem}.course-picker{padding:6px 8px;gap:4px}.course-picker select{max-width:175px;font-size:0.875rem}.course-picker .icon{display:none}main{padding:23px 18px 35px}.site-footer{padding:0 18px 20px;font-size:0.8125rem}.site-footer>span:last-child{display:none}h1{font-size:1.5625rem}.page-heading{align-items:flex-start;flex-direction:column;gap:14px;margin-bottom:22px}.page-heading p{font-size:1.0rem}.page-heading .eyebrow{font-size:0.8125rem}.home-hero{grid-template-columns:1fr;padding:28px 25px;min-height:0}.hero-art{display:none}.hero-copy h1{font-size:1.8125rem}.hero-copy .eyebrow{font-size:0.8125rem}.hero-copy>p{font-size:1.0rem}.home-stats{gap:9px;margin:15px 0 25px}.stat-card{padding:15px 10px;gap:7px;flex-direction:column;align-items:flex-start}.stat-icon{width:30px;height:30px;border-radius:9px}.stat-icon .icon{width:17px;height:17px}.stat-card strong{font-size:1.375rem}.stat-card small{font-size:0.8125rem}.mode-grid{grid-template-columns:1fr}.mode-card{padding:23px;display:grid;grid-template-columns:42px 1fr;column-gap:15px}.mode-card .mode-icon{grid-row:1/4;margin:0}.mode-card h3{font-size:1.25rem;padding-right:25px;margin:0 0 5px}.mode-card p{font-size:1.0rem;margin:0 0 12px;max-width:90%}.mode-card .text-link{grid-column:2}.mode-card .index{right:19px;top:18px;font-size:1.375rem}.bottom-grid{grid-template-columns:1fr;gap:0}.section-title{margin:24px 0 13px}.section-title h2{font-size:1.25rem}.resume-banner{flex-direction:column;align-items:flex-start;gap:12px;padding:16px}.resume-banner .btn{font-size:0.875rem}.study-toolbar{flex-wrap:wrap;gap:10px}.study-toolbar .searchbox{min-width:200px}.lesson-grid{grid-template-columns:1fr}.lesson-card{padding:22px}.lesson-layout{grid-template-columns:1fr}.lesson-toc{position:static;padding:14px;display:flex;gap:6px;overflow:auto}.lesson-toc .eyebrow,.lesson-toc .toc-summary{display:none}.lesson-toc a{min-width:135px;max-width:170px;padding:8px;font-size:0.8125rem}.article-top{padding:24px 21px}.article-top h1{font-size:1.4375rem}.article-top p{font-size:1.0rem}.learning-section{padding:22px 18px}.learning-section h2{font-size:1.25rem}.learning-section ul{font-size:1.0625rem;padding-left:17px;line-height:1.95}.table-wrap table{min-width:420px;font-size:0.875rem}th,td{padding:10px 11px}.learning-section:has(.table-wrap){overflow:hidden}.takeaway{padding:17px 18px}.takeaway p{font-size:1.0rem}.mode-intro{grid-template-columns:1fr}.launch-card{padding:25px}.launch-card h2{font-size:1.375rem}.launch-facts{gap:28px}.info-card{padding:23px}.session-heading{flex-direction:column;align-items:flex-start;gap:15px}.session-heading h1{font-size:1.3125rem}.session-actions{width:100%;justify-content:space-between}.session-layout{grid-template-columns:1fr;gap:17px}.question-card{padding:22px 18px}.question-meta{align-items:flex-start}.question-topic{text-align:right;font-size:0.8125rem;max-width:65%}.question-title{font-size:1.1875rem;margin:22px 0;line-height:1.95}.answer{font-size:1.0625rem;padding:13px 12px;gap:10px}.question-nav .btn{padding:11px 13px;font-size:0.875rem}.session-sidebar{position:static;padding:22px}.palette{grid-template-columns:repeat(8,minmax(0,1fr));max-height:260px;gap:8px}.palette-button{min-height:33px;aspect-ratio:auto}.session-stat-grid{margin-bottom:17px}.result-hero{grid-template-columns:1fr;padding:27px 22px;gap:23px}.score-ring{margin:0 auto}.result-copy h1{font-size:1.4375rem}.result-copy{text-align:center}.result-numbers{justify-content:center;gap:23px}.result-actions{justify-content:center}.review-toolbar{flex-direction:column;align-items:flex-start}.review-item{padding:20px 18px}.topic-breakdown{padding:20px}.topic-row{grid-template-columns:1fr 60px 35px;font-size:0.875rem;gap:7px}.head-actions .btn{font-size:0.875rem}.question-tools{flex-wrap:wrap}.dialog-actions{flex-wrap:wrap}.self-check summary{font-size:1.0rem}.source-heading{font-size:0.875rem}.pill{font-size:0.8125rem}html{scroll-padding-top:115px}}
@media(max-width:380px){main{padding-left:13px;padding-right:13px}.main-nav a{font-size:0.8125rem}.main-nav .icon{width:13px;height:13px}.breadcrumb>span:first-child{display:none}.hero-copy h1{font-size:1.625rem}.hero-copy .eyebrow{font-size:0.75rem}.hero-copy>p{font-size:0.875rem}.home-hero{padding:25px 20px}.launch-facts{gap:22px}.btn{padding:11px 13px}.palette{grid-template-columns:repeat(5,minmax(0,1fr))}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important;animation:none!important}}
@media print{.site-sidebar,.topbar,.site-footer,.lesson-toc,.article-actions,.lesson-bottom,.note-box,.related-bank,.skip-link,#toast{display:none!important}.site-body{margin:0}main{padding:0;max-width:none}.lesson-layout{display:block}.card,.learning-section,.article-top{box-shadow:none;break-inside:avoid;border-color:#ddd}body{background:white}.self-check details p{display:block}a{color:#333}}

/* Reading-focused visual system. Application behavior lives in app.js. */
body{line-height:1.75}
.topbar{background:#ffffffed;height:88px}
.main-nav a{color:#45576c;white-space:nowrap}
.main-nav a.active{background:#e3f3ef;color:#0b625a;box-shadow:inset 3px 0 #0f766e}
.main-nav a:hover{background:#edf4f8}
.brand small{font-size:.6875rem;letter-spacing:.8px}
.nav-label,.eyebrow{color:#526477;letter-spacing:1.1px}
.sidebar-tip,.info-card{background:#edf5f8;border-color:#d7e7ed}
.sidebar-tip p,.sidebar-tip a{font-size:.875rem}
.sidebar-bottom{font-size:.75rem}
.home-hero{background:linear-gradient(115deg,#16394a,#145a60);min-height:330px}
.hero-copy>p{color:#e0eeef;max-width:490px}
.hero-copy .eyebrow{color:#c7e8df}
.hero-copy h1{font-size:2.5rem}
.hero-note{background:#f4fffb;color:#214d46}
.btn{min-height:44px;font-size:.9375rem}
.btn-small{font-size:.875rem}
.btn-light,.pill,.tag,.source-links a{background:#edf4f8;color:#415c70}
.btn-lime{background:#b9f0df;color:#123f39}
.btn-primary:hover{background:#0a5e58}
.pill.amber{color:#795016;background:#fff2d9}
.pill.green{color:#17623e;background:#e8f6ee}
.pill.neutral{color:#526477;background:#eef2f6}
.card{box-shadow:0 5px 20px #20304705}
.page-heading p,.article-top p,.launch-card>p{font-size:1.0625rem}
.mode-card p{font-size:1rem;max-width:none}
.section-title{gap:14px;flex-wrap:wrap}
.lesson-card h2{font-size:1.3125rem}
.lesson-card-footer{flex-wrap:wrap}
.lesson-toc a{font-size:.9375rem;color:#45576c}
.lesson-toc a.active{background:#e3f3ef;color:#0b625a}
.lesson-toc a span{color:#526477}
.learning-section ul,.steps li,.self-check details p,.related-question{font-size:1.0625rem;line-height:1.9;color:#33465b}
.learning-section h2{font-size:1.375rem;letter-spacing:-.3px}
.learning-section h2>span{color:#526477;font-size:1rem}
.takeaway{background:#eaf6f3;border-left-color:#0f766e}
.takeaway strong,.takeaway p{color:#185b51}
.takeaway p{font-size:1.0625rem}
th{background:#edf3f8;color:#344e64}
td:first-child{color:#29475d}
table{font-size:1rem}
.steps li{background:#f3f6fa}
.steps li::before,.info-step>span{background:#deefeb;color:#145e55}
.pitfalls{background:#fff8eb;border-color:#ebd6b3}
.pitfalls h2,.pitfalls ul{color:#795016}
.note-box textarea{background:#fbfcfe;color:#203047;font-size:1.0625rem}
input::placeholder,textarea::placeholder{color:#627185;opacity:1}
.question-title{font-size:1.375rem;line-height:1.75;letter-spacing:0}
.answer{font-size:1.0625rem;line-height:1.8;padding:17px}
.answer-letter{width:34px;height:34px;background:#edf3f8;color:#36546a;font-size:1rem}
.answer:not(:disabled):hover{background:#f0f7fa;border-color:#6b9caa}
.answer.selected{border-color:#147d89;background:#edf8fb}
.answer.selected .answer-letter{background:#147080;color:white}
.answer.correct{border-color:#388258;background:#edf9f1}
.answer.correct .answer-letter,.palette-button.good{background:#237247;color:white;border-color:#237247}
.answer.wrong{border-color:#bd4550;background:#fff1f2}
.answer.wrong .answer-letter,.palette-button.bad{background:#b43b48;color:white;border-color:#b43b48}
.answer-feedback,.review-answer.right{background:#edf9f1;color:#1c603b}
.answer-feedback.wrong,.review-answer.incorrect{background:#fff1f2;color:#982838}
.correct .answer-state,.session-stat.good strong{color:#1c603b}
.wrong .answer-state,.session-stat.bad strong{color:#982838}
.question-count{background:#edf4f8;color:#36546a;white-space:nowrap}
.question-topic{color:#526477}
.palette-button{background:#f2f6fa;color:#40566e;font-size:.875rem}
.palette-button.answered{background:#deeff4;color:#25576a;border-color:#8dbac8}
.palette-button.active{outline-color:#145e70}
.progress-track>span{background:#0f766e}
.session-stat{background:#edf4f8}
.session-stat strong{color:#36546a}
.session-stat.good{background:#edf9f1}.session-stat.bad{background:#fff1f2}
.flag-button.flagged{background:#fff2d9;color:#795016;border-color:#c59943}
.review-filters{background:#e7eef5}
.review-filters button.active{color:#0b625a}
.review-item h3{font-size:1.125rem}.review-item .review-answer{font-size:1rem}
.site-footer{font-size:.8125rem;color:#526477}
:focus-visible{outline-color:#087e91!important}
@media(min-width:961px){.site-sidebar{width:250px}.site-body{margin-left:250px}.session-layout{grid-template-columns:minmax(0,1fr) 280px}.session-sidebar{padding:20px}.course-picker select{max-width:285px}}
@media(min-width:961px) and (max-width:1150px){.lesson-layout{grid-template-columns:1fr}.lesson-toc{position:static}.session-layout{grid-template-columns:minmax(0,1fr) 245px}.mode-grid{grid-template-columns:1fr}.mode-intro{grid-template-columns:1fr}}
@media(max-width:960px){.main-nav a{font-size:.9375rem}.topbar{top:72px;height:72px}.lesson-toc,.session-sidebar{top:160px}.mode-card p{font-size:1rem}}
@media(max-width:720px){
 .site-sidebar{padding:12px 14px 8px}.main-nav a{flex-direction:column;gap:4px;font-size:.8125rem;padding:8px 3px}.main-nav .icon{width:20px;height:20px}
 .topbar{top:0;height:auto;min-height:72px;flex-wrap:wrap;padding:12px 18px;gap:8px}.breadcrumb{font-size:.8125rem}.course-picker{max-width:100%}.course-picker select{font-size:1rem;max-width:100%;width:100%}.course-picker{width:100%}
 .hero-copy h1{font-size:2rem}.hero-copy>p,.mode-card p{font-size:1rem}.hero-copy .eyebrow{font-size:.75rem}
 .stat-card small{font-size:.8125rem}.stat-card{padding:15px 10px}.home-stats{gap:8px}
 .mode-card h3{font-size:1.25rem}.mode-card p{max-width:100%}.mode-card .index{display:none}
 .lesson-toc a{font-size:.875rem;min-width:180px}.learning-section h2{font-size:1.25rem}
 .table-wrap table{font-size:1rem;min-width:480px}.learning-section ul{font-size:1.0625rem}
 .question-title{font-size:1.25rem}.answer{font-size:1.0625rem;padding:15px 12px}.answer-text{padding-top:0}
 .question-meta{flex-wrap:wrap}.question-topic{text-align:left;max-width:100%;font-size:.875rem}
 .question-nav{flex-wrap:wrap}.question-nav .btn{font-size:.8755rem}.session-heading h1{font-size:1.5rem}
 .palette{grid-template-columns:repeat(5,minmax(0,1fr))}.palette-button{min-height:42px}
 .self-check summary{font-size:1.0625rem}.source-heading{font-size:1rem}.pill{font-size:.8125rem}
 .lesson-card-footer small{font-size:.8125rem}.topic-row{grid-template-columns:1fr 50px 40px;font-size:.9375rem}
 .launch-facts{gap:18px;flex-wrap:wrap}.lesson-bottom .btn{white-space:normal}
 html{scroll-padding-top:145px}
}
.main-nav a{transition:background .18s,color .18s;min-width:0}
.home-stats{grid-template-columns:repeat(3,minmax(0,1fr))}
.bottom-grid>*,.stat-card{min-width:0}
@media(max-width:720px){.main-nav{min-width:0}.history-row{flex-wrap:wrap}.history-score{white-space:nowrap}}

/* Abandon only the current practice session. */
.session-actions{flex-wrap:wrap}
.btn-discard{color:#982838;border-color:#e4b5bc;background:#fff}
.btn-discard:hover{background:#fff1f2;border-color:#bd4550}
/* Explanations stay separate from grading and remain readable on narrow screens. */
.explanation{margin-top:20px;padding:22px;border:1px solid #cfe1e9;border-radius:14px;background:#f6fafc;color:#263e52;overflow-wrap:anywhere}
.explanation h3,.explanation summary{font-size:1.0625rem;font-weight:700;color:#174c59;line-height:1.6}
.explanation h3{display:flex;align-items:center;gap:9px;margin:0 0 13px}
.explanation-body>p{font-size:1.0625rem;line-height:1.85;margin:0}
.explanation-body .explanation-tip{margin-top:16px;padding:12px 14px;border-radius:9px;background:#e8f4f0;color:#185b51;font-size:1rem}
.explanation-note{margin-top:16px;padding:13px 15px;border-left:3px solid #b88229;background:#fff6e5;border-radius:0 8px 8px 0;color:#75501b;font-size:.9375rem;line-height:1.8}
.explanation-note strong{display:block;margin-bottom:5px}
.explanation-sources{margin-top:17px;font-size:.875rem;color:#526477}
.explanation .source-links{margin-top:8px;gap:8px}
.explanation .source-links a{font-size:.875rem;white-space:normal;padding:7px 10px;border:1px solid #d6e3ec;background:#fff;line-height:1.7}
.explanation .source-links .icon{width:15px;height:15px}
.explanation-credit{display:block;margin-top:14px;font-size:.8125rem;color:#596b7b;line-height:1.7}
.explanation-review summary{cursor:pointer;min-height:28px}
.explanation-review[open] summary{margin-bottom:14px}
@media(max-width:720px){.explanation{padding:17px 14px}.explanation-note{padding:12px}.explanation-body>p{font-size:1.0625rem}.explanation-review{margin-top:16px}}