*{box-sizing:border-box}body,html{margin:0;padding:0;height:100%}body{background:var(--theme-bg);color:var(--theme-text);font-family:var(--font-sans);font-size:16px;line-height:1.55;letter-spacing:-.01em;-webkit-font-smoothing:antialiased;font-feature-settings:"kern" 1,"liga" 1;text-rendering:optimizeLegibility}h1,h2,h3,h4{-webkit-hyphens:none;hyphens:none;text-wrap:balance}button,input,select,textarea{font:inherit;color:inherit;letter-spacing:inherit}button{cursor:pointer}.tnum{font-feature-settings:"tnum";font-variant-numeric:tabular-nums}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-thumb{background:var(--theme-scrollbar);border-radius:3px}::-webkit-scrollbar-track{background:transparent}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}.landing{max-width:780px;margin:0 auto;padding:0 24px 64px}.landing-hero{padding:14vh 0 8vh}.eyebrow{text-transform:uppercase;letter-spacing:.08em;font-size:.75rem;font-weight:600;color:var(--theme-textMuted);margin:0 0 10px}.landing-hero h1{font-size:clamp(2.25rem,7vw,3.5rem);line-height:1.05;letter-spacing:-.025em;margin:0 0 18px}.lede{font-size:1.125rem;color:var(--theme-textMuted);max-width:46ch;text-wrap:pretty;margin:0 0 30px}.cta-row{display:flex;flex-wrap:wrap;gap:10px}.cta{display:inline-block;padding:11px 20px;border-radius:var(--radius);background:var(--accent);color:var(--accent-text);font-weight:550;text-decoration:none}.cta.ghost{background:transparent;color:var(--theme-text);border:1px solid var(--theme-border)}.landing-section{padding:6vh 0 0}.landing-section h2{font-size:1.375rem;letter-spacing:-.015em;margin:0 0 18px}.section-lede{color:var(--theme-textMuted);max-width:54ch;text-wrap:pretty;margin:0 0 22px}.cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));grid-gap:14px;gap:14px}.card{border:1px solid var(--theme-border);border-radius:var(--radius);background:var(--theme-card);padding:18px}.card h3{font-size:1rem;margin:0 0 7px}.card p{margin:0;font-size:.9375rem;color:var(--theme-textMuted);text-wrap:pretty}.feature-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:14px}.feature-list li{color:var(--theme-textMuted);max-width:60ch;text-wrap:pretty}.feature-list strong{color:var(--theme-text);font-weight:600}.landing-foot{margin-top:8vh;padding-top:22px;border-top:1px solid var(--theme-border);color:var(--theme-textMuted);font-size:.875rem}.landing-foot p{margin:0;text-wrap:pretty}.auth-wrap{min-height:100dvh;display:grid;place-items:center;padding:24px}.auth-card{width:100%;max-width:380px}.auth-card h1{font-size:1.5rem;line-height:1.25;letter-spacing:-.01em;margin:0 0 6px}.auth-card .sub{color:var(--theme-textMuted);font-size:.9375rem;margin:0 0 24px;text-wrap:pretty}.field{display:block;margin-bottom:14px}.field span{display:block;font-size:.8125rem;color:var(--theme-textMuted);margin-bottom:5px}.field input{width:100%;padding:10px 12px;border:1px solid var(--theme-border);border-radius:var(--radius);background:var(--theme-card)}.field input:focus-visible{outline:2px solid var(--accent);outline-offset:1px}.btn-primary{width:100%;padding:11px 16px;margin-top:6px;border:0;border-radius:var(--radius);background:var(--accent);color:var(--accent-text);font-weight:550}.btn-primary:disabled{opacity:.55;cursor:default}.error{color:var(--danger);font-size:.875rem;margin:12px 0 0}.switch-link{margin-top:20px;font-size:.875rem;color:var(--theme-textMuted);text-align:center}.switch-link a{color:var(--accent)}.notify-bar{display:flex;align-items:center;gap:12px;flex-wrap:wrap;padding:10px 20px;border-bottom:1px solid var(--theme-border);background:var(--theme-card);font-size:.875rem;color:var(--theme-textMuted)}.notify-bar span{flex:1 1;min-width:200px;text-wrap:pretty}.notify-bar strong{color:var(--theme-text)}.notify-bar button{padding:6px 12px;border:1px solid var(--theme-border);border-radius:8px;background:var(--theme-bg);font-size:.8125rem;white-space:nowrap}.notify-bar button:first-of-type{background:var(--accent);color:var(--accent-text);border-color:transparent;font-weight:550}.learn{max-width:720px;margin:0 auto;padding:32px 24px 80px}.back{display:inline-block;font-size:.875rem;color:var(--theme-textMuted);text-decoration:none;margin-bottom:20px}.back:hover{color:var(--theme-text)}.learn-head h1{font-size:clamp(1.75rem,5vw,2.25rem);line-height:1.15;letter-spacing:-.02em;margin:0 0 12px}.lesson-step,.track-meta{font-size:.875rem;color:var(--theme-textMuted);margin:0 0 18px}.topic-box{border:1px solid var(--theme-border);border-radius:var(--radius);background:var(--theme-card);padding:14px 16px;margin:0 0 24px}.topic-label{display:block;font-size:.75rem;text-transform:uppercase;letter-spacing:.06em;font-weight:600;color:var(--accent);margin-bottom:6px}.topic-box p{margin:0;text-wrap:pretty}.track-done{color:var(--theme-textMuted);text-wrap:pretty}.track-list{list-style:none;margin:28px 0 0;padding:0;display:flex;flex-direction:column;gap:12px}.track-card{border:1px solid var(--theme-border);border-radius:var(--radius);background:var(--theme-card)}.track-card>a{display:block;padding:18px;text-decoration:none;color:inherit}.track-card:not(.muted):hover{border-color:var(--accent)}.track-card.muted{padding:18px;opacity:.72}.track-card-top{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:6px}.track-card h2{font-size:1.0625rem;letter-spacing:-.01em;margin:0}.pill{font-size:.75rem;background:var(--theme-bg);border:1px solid var(--theme-border);border-radius:999px;padding:2px 9px;white-space:nowrap}.pill,.track-card p{color:var(--theme-textMuted)}.track-card p{margin:0;font-size:.9375rem;text-wrap:pretty}.track-note{margin-top:8px!important;font-size:.8125rem!important;color:var(--theme-textMuted)}.lesson-list{list-style:none;counter-reset:lesson;margin:28px 0 0;padding:0;display:flex;flex-direction:column;gap:8px}.lesson-list a{display:flex;align-items:center;gap:14px;padding:14px 16px;border:1px solid var(--theme-border);border-radius:var(--radius);background:var(--theme-card);text-decoration:none;color:inherit}.lesson-list a:hover{border-color:var(--accent)}.lesson-num{flex-shrink:0;width:26px;height:26px;display:grid;place-items:center;border-radius:50%;border:1px solid var(--theme-border);background:var(--theme-bg);font-size:.8125rem;color:var(--theme-textMuted)}.lesson-list .done .lesson-num{background:var(--accent);border-color:transparent;color:var(--accent-text)}.lesson-body{flex:1 1;min-width:0}.lesson-title{display:block;font-weight:550;letter-spacing:-.005em}.lesson-summary{display:block;font-size:.875rem;color:var(--theme-textMuted);text-wrap:pretty}.lesson-time{flex-shrink:0;font-size:.8125rem;color:var(--theme-textMuted)}.lesson-content section{margin-bottom:8px}.lesson-content h2{font-size:1.125rem;letter-spacing:-.01em;margin:32px 0 10px}.lesson-content p{margin:0 0 1em;text-wrap:pretty}.lesson-content ol,.lesson-content ul{margin:0 0 1em;padding-left:1.35em}.lesson-content li{margin-bottom:.4em;text-wrap:pretty}.lesson-content blockquote{margin:0 0 1em;padding:10px 16px;border-left:3px solid var(--accent);background:var(--theme-card);border-radius:0 var(--radius) var(--radius) 0;font-style:normal}.lesson-content blockquote p{margin:0}.table-scroll{overflow-x:auto;margin:0 0 1em;border:1px solid var(--theme-border);border-radius:var(--radius)}.table-scroll table{border-collapse:collapse;width:100%;font-size:.9375rem}.table-scroll td,.table-scroll th{text-align:left;padding:9px 13px;border-bottom:1px solid var(--theme-border);white-space:nowrap}.table-scroll th{background:var(--theme-card);font-size:.8125rem;font-weight:600}.table-scroll tr:last-child td{border-bottom:0}.terms{margin-top:36px;padding:18px;border:1px solid var(--theme-border);border-radius:var(--radius);background:var(--theme-card)}.terms h2{font-size:.8125rem;text-transform:uppercase;letter-spacing:.06em;color:var(--theme-textMuted);margin:0 0 12px}.terms dl{margin:0}.terms div+div{margin-top:10px}.terms dt{font-weight:600;font-size:.9375rem}.terms dd{margin:2px 0 0;font-size:.9375rem;color:var(--theme-textMuted);text-wrap:pretty}.checkpoint{margin-top:36px;padding:20px;border:1px solid var(--theme-border);border-radius:var(--radius)}.checkpoint h2{font-size:.8125rem;text-transform:uppercase;letter-spacing:.06em;color:var(--theme-textMuted);margin:0 0 10px}.checkpoint-q{margin:0 0 14px;font-weight:550;text-wrap:pretty}.checkpoint-options{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:8px}.checkpoint-option{width:100%;text-align:left;padding:10px 14px;border:1px solid var(--theme-border);border-radius:var(--radius);background:var(--theme-card);font-size:.9375rem;text-wrap:pretty}.checkpoint-option:not(:disabled):hover{border-color:var(--accent)}.checkpoint-option:disabled{cursor:default}.checkpoint-option.correct{border-color:#2e8b57;background:color-mix(in srgb,#2e8b57 12%,var(--theme-card))}.checkpoint-option.wrong{border-color:var(--danger);background:color-mix(in srgb,var(--danger) 10%,var(--theme-card))}.checkpoint-explain{margin:14px 0 0;font-size:.9375rem;color:var(--theme-textMuted);text-wrap:pretty}.lesson-footer{margin-top:32px;padding-top:22px;border-top:1px solid var(--theme-border)}.lesson-nav{display:flex;align-items:center;justify-content:space-between;gap:12px}.lesson-nav .cta{border:0;font-size:.9375rem}.lesson-nav .cta.ghost{border:1px solid var(--theme-border)}.lesson-done-note{margin:12px 0 0;font-size:.8125rem;color:var(--theme-textMuted)}.lesson-help{margin:18px 0 0;font-size:.875rem;color:var(--theme-textMuted);text-wrap:pretty}.lesson-help a{color:var(--accent)}.brand-bar{position:fixed;inset:0 0 auto 0;z-index:10;height:3px;background:var(--navy-500)}.brand-lockup{display:inline-flex;align-items:center;gap:8px;margin-bottom:28px;color:var(--theme-text)}.brand-lockup span{font-size:.875rem;font-weight:600;letter-spacing:-.01em}