:root{--bg:#FFFFFF;--surface:#FFFFFF;--surface-2:#F6F7F8;--ink:#000A14;--muted:#5A6472;--border:#E3E6EA;--lime:#D9FF42;--lime-ink:#04140A;--lime-text:#47540E;--lime-soft:#F6FFDC;--good:#187A50;--good-bg:#E4F5EC;--bad:#B3372F;--bad-bg:#FBEAE8;--locked:#B7BECC;--shadow: 0 1px 2px rgba(0,10,20,.04), 0 8px 24px rgba(0,10,20,.06)}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--ink);font-family:IBM Plex Sans,-apple-system,BlinkMacSystemFont,sans-serif;line-height:1.5}h1,h2,h3{font-family:Fraunces,Georgia,serif;text-wrap:balance;margin:0}a{color:inherit}button{font-family:inherit;cursor:pointer}.muted{color:var(--muted)}.small{font-size:12px}.eyebrow{font-family:IBM Plex Mono,SFMono-Regular,monospace;font-size:11px;font-weight:600;letter-spacing:.09em;text-transform:uppercase;color:var(--lime-text)}.brand-logo{display:block;height:32px;width:auto}.brand-logo.sm{height:24px}.mark-fallback{display:none;align-items:center;gap:8px}.mark{width:32px;height:32px;border-radius:8px;flex-shrink:0;background:var(--ink);position:relative}.mark:before{content:"";position:absolute;top:8px;right:8px;bottom:8px;left:8px;border-radius:50%;border:3px solid var(--lime)}.mark:after{content:"";position:absolute;width:7px;height:7px;background:var(--lime);border-radius:1.5px;top:6px;right:6px;transform:rotate(45deg)}.fallback-word{font-family:IBM Plex Sans,sans-serif;font-weight:700;font-size:16px;color:var(--ink);letter-spacing:-.01em}.brand{display:flex;flex-direction:column;line-height:1.15}.brand-name{font-family:Fraunces,serif;font-weight:600;font-size:16px}.brand-tag{font-family:IBM Plex Mono,monospace;font-size:10.5px;color:var(--muted);letter-spacing:.03em}.auth-split{min-height:100vh;display:flex}.auth-split-brand{flex:1;background:var(--ink);color:var(--bg);display:flex;flex-direction:column;justify-content:space-between;padding:48px;position:relative;overflow:hidden}.auth-split-brand:after{content:"";position:absolute;width:420px;height:420px;border-radius:50%;border:60px solid var(--lime-soft);opacity:.06;right:-140px;bottom:-160px}.auth-split-brand .sidebar-brand{position:relative;z-index:1}.auth-split-copy{position:relative;z-index:1;max-width:420px}.auth-split-copy h1{color:var(--bg);font-size:clamp(26px,3vw,36px);font-weight:600;margin-bottom:12px;line-height:1.2}.auth-split-copy p{color:#c9cfd6;font-size:15px;margin:0}.auth-split-form{flex:1;display:flex;align-items:center;justify-content:center;background:var(--bg);padding:32px}@media (max-width:760px){.auth-split{flex-direction:column}.auth-split-brand{padding:32px;flex:none}.auth-split-copy{display:none}}.auth-card{width:380px;max-width:100%;display:flex;flex-direction:column;gap:14px}.auth-card h1{font-size:21px;font-weight:600;margin:0}.auth-card label{display:flex;flex-direction:column;gap:5px;font-size:12.5px;font-weight:600;color:var(--muted)}.auth-card input{padding:11px 12px;border:1px solid var(--border);border-radius:9px;font-size:14.5px;font-weight:400;color:var(--ink);font-family:inherit;background:var(--surface)}.auth-card input:focus{outline:2px solid var(--lime);outline-offset:1px;border-color:var(--lime-text)}.error-text{color:var(--bad);font-size:13px}.success-text{color:var(--good);font-size:13px}.btn{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:none;border-radius:9px;padding:10px 16px;font-size:13.5px;font-weight:600}.btn-primary{background:var(--lime);color:var(--lime-ink)}.btn-primary:hover{filter:brightness(1.05)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-secondary{background:var(--surface-2);color:var(--ink);border:1px solid var(--border)}.btn-secondary:hover{background:var(--border)}.btn-danger{background:var(--bad-bg);color:var(--bad);border:1px solid color-mix(in srgb,var(--bad) 30%,transparent)}.btn-link{background:none;border:none;color:var(--lime-text);font-size:13px;font-weight:600;padding:0}.app-shell{display:flex;min-height:100vh}.app-sidebar{width:264px;flex-shrink:0;background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;padding:20px 16px;gap:20px;position:sticky;top:0;height:100vh;overflow-y:auto}.app-sidebar-top{display:flex;flex-direction:column;gap:18px}.sidebar-brand{display:flex;align-items:center;gap:10px;padding:2px 4px}.sidebar-back{display:inline-flex;align-items:center;gap:6px;font-size:12.5px;color:var(--muted);background:none;border:none;padding:0;align-self:flex-start}.sidebar-back:hover{color:var(--ink)}.sidebar-section-label{font-family:IBM Plex Mono,monospace;font-size:10.5px;letter-spacing:.06em;text-transform:uppercase;color:var(--muted);padding:0 4px}.sidebar-nav{display:flex;flex-direction:column;gap:2px}.sidebar-nav-item{display:flex;align-items:center;gap:9px;text-align:left;background:none;border:none;padding:9px 10px;border-radius:8px;font-size:13.5px;font-weight:500;color:var(--ink)}.sidebar-nav-item:hover{background:var(--surface-2)}.sidebar-nav-item.active{background:var(--lime-soft);color:var(--lime-text);font-weight:600}.sidebar-tier-title{font-size:12.5px;color:var(--muted);padding:0 4px}.sidebar-tier-title strong{color:var(--ink);font-weight:600;display:block;font-size:14px;margin-top:2px}.app-sidebar-bottom{margin-top:auto;display:flex;flex-direction:column;gap:8px;padding-top:14px;border-top:1px solid var(--border)}.sidebar-user{font-size:12.5px;font-weight:600}.sidebar-user-email{font-size:11.5px;color:var(--muted)}.app-main{flex:1;min-width:0;overflow-y:auto}.page{max-width:1080px;margin:0 auto;padding:40px 32px}.page-narrow{max-width:760px}.path{list-style:none;margin:0;padding:0;position:relative}.path-item{position:relative;padding-left:34px;padding-block:11px;cursor:pointer;border:none;background:none;width:100%;text-align:left;display:block}.path-item:not(:last-child):before{content:"";position:absolute;left:11px;top:34px;bottom:-3px;width:1.5px;background:var(--border)}.path-dot{position:absolute;left:0;top:10px;width:24px;height:24px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-family:IBM Plex Mono,monospace;font-size:11px;font-weight:600;background:var(--surface);border:1.5px solid var(--border);color:var(--muted)}.path-item.is-current .path-dot{border-color:var(--lime-text);color:var(--lime-text);background:var(--lime-soft)}.path-item.is-passed .path-dot{border-color:var(--good);background:var(--good-bg);color:var(--good)}.path-label{font-size:13.5px;font-weight:500;color:var(--ink)}.path-item.is-current .path-label{color:var(--lime-text);font-weight:600}.path-sub{font-family:IBM Plex Mono,monospace;font-size:10.5px;color:var(--muted);margin-top:2px}.final-quiz-path{margin-top:8px;border-top:1px solid var(--border);padding-top:10px}.landing-head{max-width:640px;margin-bottom:32px}.landing-head h1{font-size:clamp(24px,4vw,34px);font-weight:600;margin-block:8px 8px}.landing-head p{color:var(--muted);font-size:15px;max-width:60ch}.tier-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}.tier-card{background:var(--surface);border:1px solid var(--border);border-radius:14px;padding:22px;display:flex;flex-direction:column;gap:10px;box-shadow:var(--shadow);min-height:200px;cursor:pointer}.tier-card:hover{border-color:var(--lime-text)}.tier-num{font-family:IBM Plex Mono,monospace;font-size:12px;color:var(--muted);letter-spacing:.05em}.tier-card h3{font-size:19px;font-weight:600}.tier-audience{font-size:13px;color:var(--muted)}.tier-meta{font-size:12px;color:var(--muted);font-family:IBM Plex Mono,monospace;margin-top:auto}.status-badge{font-size:11.5px;padding:3px 9px;border-radius:20px;font-weight:600;display:inline-block}.status-completed{background:var(--good-bg);color:var(--good)}.status-progress{background:var(--lime-soft);color:var(--lime-text)}.status-new{background:var(--surface-2);color:var(--muted)}.lesson-wrap{max-width:700px}.lesson-wrap>.eyebrow{display:block;margin-bottom:12px}.lesson-title{font-size:30px;font-weight:700;line-height:1.15;margin-bottom:8px}.prose p{max-width:64ch;font-size:16.5px;font-weight:500;line-height:1.75;color:var(--ink);margin-block:26px}.prose strong{font-weight:700}.term-list{list-style:none;margin:30px 0;padding:0;display:flex;flex-direction:column;border:1px solid var(--border);border-radius:12px;overflow:hidden}.term-row{display:grid;grid-template-columns:150px 1fr;gap:16px;padding:16px 18px}.term-row:not(:last-child){border-bottom:1px solid var(--border)}.term-row dt{font-weight:700;font-size:14px;font-family:IBM Plex Mono,monospace;color:var(--lime-text);margin:0}.term-row dd{margin:0;font-size:14.5px;font-weight:500;color:var(--muted);line-height:1.6}.callout{border-left:3px solid var(--lime);background:var(--lime-soft);border-radius:0 10px 10px 0;padding:18px 20px;margin-block:30px}.callout-title{font-size:12px;font-weight:700;letter-spacing:.04em;text-transform:uppercase;color:var(--lime-text);margin-bottom:6px}.callout p{margin:0;font-size:15px;font-weight:500;color:var(--ink);line-height:1.65}.lesson-figure{margin-block:30px;border-radius:14px;overflow:hidden;border:1px solid var(--border);background:var(--surface-2)}.lesson-figure img{display:block;width:100%}.figure-placeholder{display:none;padding:44px 20px;text-align:center;color:var(--muted);flex-direction:column;align-items:center;gap:8px}.figure-placeholder .fp-title{font-size:13.5px;font-weight:600;color:var(--muted)}.figure-placeholder .fp-path{font-family:IBM Plex Mono,monospace;font-size:12px;color:var(--muted)}.lesson-figure.is-missing img{display:none}.lesson-figure.is-missing .figure-placeholder{display:flex}.lesson-figure figcaption{padding:12px 18px;font-size:12.5px;color:var(--muted);border-top:1px solid var(--border)}.lesson-diagram{margin-block:30px;padding:22px;border:1px solid var(--border);border-radius:14px;background:var(--surface-2)}.lesson-diagram svg{display:block;width:100%;height:auto}.lesson-diagram .diagram-caption{margin-top:14px;padding-top:12px;border-top:1px solid var(--border);font-size:12.5px;color:var(--muted)}.divider{height:1px;background:var(--border);margin-block:44px}.lesson-nav-row{margin-top:36px;display:flex;justify-content:flex-end}.quiz-head h3{font-size:19px;font-weight:700;margin-bottom:6px}.quiz-sub{font-size:13px;color:var(--muted);margin-bottom:22px}.quiz-progress{display:flex;align-items:center;gap:10px;margin-bottom:16px}.quiz-progress-label{font-family:IBM Plex Mono,monospace;font-size:11.5px;color:var(--muted)}.dots{display:flex;gap:6px}.dot{width:8px;height:8px;border-radius:50%;background:var(--border)}.dot.is-done{background:var(--good)}.dot.is-current{background:var(--lime);border:1px solid var(--lime-text)}.quiz-stack{position:relative}.stack-peek{position:absolute;top:0;right:0;bottom:0;left:0;border-radius:16px;border:1px solid var(--border);background:var(--surface);z-index:0;pointer-events:none}.stack-peek.p1{transform:translateY(12px);opacity:.75}.stack-peek.p2{transform:translateY(22px);opacity:.45}.q-card{position:relative;z-index:2;border:1px solid var(--border);border-radius:16px;padding:24px;background:var(--surface);box-shadow:var(--shadow)}.q-text{font-size:15.5px;font-weight:700;margin-bottom:16px;line-height:1.5}.q-options{display:flex;flex-direction:column;gap:9px}.option{display:flex;align-items:center;gap:11px;border:1px solid var(--border);border-radius:10px;padding:12px 15px;cursor:pointer;font-size:14.5px;font-weight:500;background:var(--surface);position:relative}.option:hover{border-color:var(--lime-text)}.option input{position:absolute;opacity:0;width:1px;height:1px}.option-dot{width:16px;height:16px;border-radius:50%;border:1.5px solid var(--border);flex-shrink:0;position:relative}.option.is-selected{border-color:var(--lime-text);background:var(--lime-soft)}.option.is-selected .option-dot{border-color:var(--lime-text)}.option.is-selected .option-dot:after{content:"";position:absolute;top:3px;right:3px;bottom:3px;left:3px;border-radius:50%;background:var(--lime)}.q-card.is-locked .option{cursor:default}.q-card.is-locked .option:hover{border-color:var(--border)}.q-card.is-locked .option.is-correct{border-color:var(--good);background:var(--good-bg)}.q-card.is-locked .option.is-wrong{border-color:var(--bad);background:var(--bad-bg)}.q-feedback{margin-top:16px;padding:14px 16px;border-radius:10px;font-size:14px;font-weight:600}.q-feedback.good{background:var(--good-bg);color:var(--good)}.q-feedback.bad{background:var(--bad-bg);color:var(--bad)}.q-feedback .exp{display:block;margin-top:6px;font-weight:500;color:var(--ink)}.q-actions{margin-top:16px}.complete-banner{padding:20px 22px;border-radius:12px;background:var(--good-bg);border:1px solid color-mix(in srgb,var(--good) 40%,transparent);display:flex;align-items:center;justify-content:space-between;gap:14px;flex-wrap:wrap}.complete-banner p{margin:0;font-size:14.5px;color:var(--good);font-weight:700}.exam-intro{font-size:15.5px;font-weight:500;color:var(--muted);line-height:1.7;max-width:60ch;margin-block:18px}.exam-intro strong{color:var(--ink);font-weight:700}.result-ring-wrap{position:relative;width:140px;height:140px;margin:24px auto 8px}.result-ring{width:140px;height:140px;display:block;transform:rotate(-90deg)}.ring-track{fill:none;stroke:var(--surface-2);stroke-width:8}.ring-progress{fill:none;stroke-width:8;stroke-linecap:round;transition:stroke-dashoffset 1s ease}.ring-progress.is-good{stroke:var(--good)}.ring-progress.is-bad{stroke:var(--bad)}.result-ring-num{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;font-family:Fraunces,serif;font-weight:700;font-size:28px;color:var(--ink)}.result-reveal{margin-top:22px}.result-heading{text-align:center;font-size:16px;font-weight:700;margin-bottom:4px}.result-heading.is-good{color:var(--good)}.result-heading.is-bad{color:var(--bad)}.admin-tabs{display:flex;gap:8px;margin:4px 0 24px;flex-wrap:wrap}.admin-tabs button{background:var(--surface-2);border:none;padding:9px 16px;border-radius:8px;font-size:13px;font-weight:600;color:var(--muted)}.admin-tabs button.active{background:var(--ink);color:#fff}.admin-panel{display:flex;flex-direction:column;gap:16px;align-items:flex-start;max-width:640px}.admin-table{width:100%;border-collapse:collapse;background:var(--surface);border:1px solid var(--border);border-radius:12px;overflow:hidden}.admin-table th,.admin-table td{text-align:left;padding:11px 14px;border-bottom:1px solid var(--border);font-size:13px}.admin-table th{color:var(--muted);font-weight:600;background:var(--surface-2)}.admin-table tr:last-child td{border-bottom:none}.field-label{display:block;font-size:12.5px;font-weight:600;color:var(--muted);margin-bottom:6px}.field-input,textarea.field-input,select.field-input{width:100%;border:1px solid var(--border);border-radius:9px;padding:10px 13px;font-size:14px;font-family:inherit;color:var(--ink);background:var(--surface)}.field-input:focus{outline:2px solid var(--lime);outline-offset:1px;border-color:var(--lime-text)}textarea.field-input{resize:vertical;min-height:80px;font-family:IBM Plex Mono,monospace;font-size:12.5px}.field-row{width:100%;display:flex;flex-direction:column;gap:6px}.field-grid-2{display:grid;grid-template-columns:1fr 1fr;gap:14px;width:100%}.wizard-steps{display:flex;gap:8px;margin-bottom:20px}.wizard-step{font-family:IBM Plex Mono,monospace;font-size:11px;padding:6px 12px;border-radius:20px;background:var(--surface-2);color:var(--muted);font-weight:600}.wizard-step.active{background:var(--lime-soft);color:var(--lime-text)}.wizard-step.done{background:var(--good-bg);color:var(--good)}.tier-row{display:flex;gap:10px;align-items:flex-end;width:100%;padding:12px;border:1px solid var(--border);border-radius:10px}.tier-row .field-row{flex:1}.warning-box{background:var(--lime-soft);border:1px solid var(--lime);border-radius:10px;padding:12px 16px;font-size:13px;color:var(--lime-text)}.file-picker{width:100%}.file-chip-list{display:flex;flex-wrap:wrap;gap:8px;align-items:center}.file-chip{display:inline-flex;align-items:center;gap:6px;background:var(--surface-2);border:1px solid var(--border);border-radius:20px;padding:6px 8px 6px 12px;font-size:12.5px;max-width:220px}.file-chip-remove{background:var(--border);border:none;border-radius:50%;width:18px;height:18px;line-height:1;font-size:13px;color:var(--ink);display:flex;align-items:center;justify-content:center;flex-shrink:0;padding:0}.file-chip-remove:hover{background:var(--bad);color:#fff}.file-chip-add{font-size:12.5px;padding:7px 14px}