.activity-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:4rem 2rem;color:var(--text-muted);min-height:240px}.activity-loading-spinner{width:32px;height:32px;border:2px solid var(--border);border-top-color:var(--accent);border-radius:50%;animation:spin .7s linear infinite;margin-bottom:1rem}@keyframes spin{to{transform:rotate(360deg)}}.site-shell{min-height:100vh;display:flex;flex-direction:column;background:var(--bg-deep)}.site-nav{position:sticky;top:0;z-index:100;display:flex;align-items:center;justify-content:space-between;gap:1rem;flex-wrap:wrap;padding:max(.85rem,env(safe-area-inset-top)) max(2rem,env(safe-area-inset-right)) .85rem max(2rem,env(safe-area-inset-left));background:#060a12d1;backdrop-filter:blur(16px) saturate(1.2);border-bottom:1px solid var(--border)}.site-brand{display:flex;align-items:center;gap:.85rem;text-align:left}.site-brand-mark{width:42px;height:42px;border-radius:10px;object-fit:cover;border:1px solid var(--border-strong)}.site-brand-logo{object-fit:contain;background:#0a0f18;padding:2px}.site-brand-text{display:flex;flex-direction:column;line-height:1.2}.site-brand-text strong{font-size:.95rem;font-weight:600;letter-spacing:.02em}.site-brand-text span{font-size:.72rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.08em}.site-nav-back{display:inline-flex;align-items:center;gap:.45rem;font-size:.85rem;font-weight:500;color:var(--text-secondary);padding:.5rem .9rem;border:1px solid var(--border);border-radius:999px;transition:color .15s,border-color .15s,background .15s}.site-nav-back svg{width:16px;height:16px}.site-nav-back:hover{color:var(--text);border-color:var(--border-strong);background:var(--bg-elevated)}.site-nav-actions{display:flex;align-items:center;gap:.75rem;margin-left:auto}.site-nav-auth{display:flex;align-items:center;gap:.5rem}.site-nav-login,.site-nav-logout{font-size:.85rem;font-weight:600;padding:.5rem 1rem;border-radius:999px;min-height:44px;transition:color .15s,border-color .15s,background .15s}.site-nav-login{color:var(--accent);border:1px solid var(--accent);background:#c9a22714}.site-nav-login:hover{background:#c9a2272e}.site-nav-logout{color:var(--text-muted);border:1px solid var(--border)}.site-nav-logout:hover{color:var(--text);border-color:var(--border-strong)}.site-main{flex:1}.page-content{max-width:1080px;margin:0 auto;padding:0 max(2rem,env(safe-area-inset-left)) 3rem max(2rem,env(safe-area-inset-right));width:100%}.site-footer{border-top:1px solid var(--border);background:var(--bg);padding:2rem max(2rem,env(safe-area-inset-left)) max(2rem,env(safe-area-inset-bottom)) max(2rem,env(safe-area-inset-right))}.site-footer-inner{max-width:1080px;margin:0 auto;text-align:center}.site-footer p{font-size:.88rem;color:var(--text-secondary)}.site-footer-sub{margin-top:.35rem;font-size:.78rem!important;color:var(--text-muted)!important}.hero{position:relative;min-height:72vh;display:flex;align-items:flex-end;overflow:hidden}.hero-media{position:absolute;inset:0}.hero-image{width:100%;height:100%;object-fit:cover;object-position:center 35%;transform:scale(1.02)}.hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,#060a1259,#060a128c 45%,#060a12f2),linear-gradient(90deg,rgba(6,10,18,.7) 0%,transparent 55%)}.hero-content{position:relative;z-index:1;max-width:1080px;margin:0 auto;padding:4rem 2rem 3.5rem;width:100%}.hero-eyebrow{font-family:var(--mono);font-size:.75rem;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin-bottom:1rem}.hero h1{font-family:var(--font-display);font-size:clamp(2.4rem,5.5vw,4rem);font-weight:700;line-height:1.08;letter-spacing:-.02em;max-width:720px;margin-bottom:1.25rem}.hero-lead{font-size:1.08rem;color:var(--text-secondary);max-width:580px;line-height:1.7;margin-bottom:2rem}.hero-stats{display:flex;gap:2.5rem;flex-wrap:wrap;padding-top:1.5rem;border-top:1px solid var(--border)}.hero-stats div{display:flex;flex-direction:column;gap:.2rem}.hero-stats strong{font-family:var(--font-display);font-size:1.75rem;color:var(--text)}.hero-stats span{font-size:.78rem;text-transform:uppercase;letter-spacing:.08em;color:var(--text-muted)}.modules-section{max-width:1080px;margin:0 auto;padding:3.5rem max(2rem,env(safe-area-inset-left)) 4rem max(2rem,env(safe-area-inset-right));width:100%}.section-heading{margin-bottom:2rem}.section-heading.compact{margin-bottom:1.25rem}.section-heading h2{font-family:var(--font-display);font-size:1.75rem;font-weight:600;margin-bottom:.4rem}.section-heading p{color:var(--text-muted);font-size:.95rem}.module-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:1.5rem}.module-card{text-align:left;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);overflow:hidden;transition:transform .25s ease,box-shadow .25s ease,border-color .25s;box-shadow:0 4px 24px #0003}.module-card:hover{transform:translateY(-4px);border-color:color-mix(in srgb,var(--accent) 40%,transparent);box-shadow:var(--shadow)}.module-card-media{position:relative;height:200px;overflow:hidden}.module-card-media img{width:100%;height:100%;object-fit:cover;transition:transform .4s ease;content-visibility:auto}.module-card:hover .module-card-media img{transform:scale(1.05)}.module-card-shade{position:absolute;inset:0;background:linear-gradient(180deg,transparent 30%,rgba(6,10,18,.85) 100%)}.module-card-body{padding:1.35rem 1.5rem 1.5rem}.module-card-tag{display:inline-block;font-family:var(--mono);font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);margin-bottom:.5rem}.module-card h3{font-size:1.2rem;font-weight:600;margin-bottom:.5rem}.module-card-body>p{font-size:.9rem;color:var(--text-secondary);line-height:1.55;margin-bottom:1rem}.module-card-link{display:inline-flex;align-items:center;gap:.4rem;font-size:.85rem;font-weight:600;color:var(--accent)}.module-card-link svg{width:16px;height:16px;transition:transform .2s}.module-card:hover .module-card-link svg{transform:translate(3px)}.section-hub{padding-top:.5rem}.module-hero{position:relative;border-radius:var(--radius-lg);overflow:hidden;margin-bottom:2rem;border:1px solid var(--border);min-height:280px;display:flex;align-items:flex-end}.module-hero-media{position:absolute;inset:0}.module-hero-media img{width:100%;height:100%;object-fit:cover}.module-hero-shade{position:absolute;inset:0;background:linear-gradient(90deg,#060a12eb,#060a1280 60%,#060a124d)}.module-hero-text{position:relative;z-index:1;padding:2rem 2.25rem;max-width:640px}.module-hero-tag{font-family:var(--mono);font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent)}.module-hero h1{font-family:var(--font-display);font-size:clamp(1.75rem,4vw,2.5rem);margin:.4rem 0 .75rem}.module-hero-text>p{color:var(--text-secondary);font-size:.95rem;line-height:1.6}.metrics-row{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin-bottom:2.5rem}.metric{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:1.25rem 1.5rem}.metric-value{display:block;font-family:var(--font-display);font-size:2rem;font-weight:600;line-height:1;margin-bottom:.35rem}.metric-label{font-size:.78rem;text-transform:uppercase;letter-spacing:.07em;color:var(--text-muted)}.activity-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:1rem}.activity-card{text-align:left;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:1.35rem;transition:background .2s,border-color .2s,transform .2s}.activity-card:hover{background:var(--bg-card-hover);border-color:color-mix(in srgb,var(--accent) 35%,transparent);transform:translateY(-2px)}.activity-card-icon{display:flex;align-items:center;justify-content:center;width:56px;height:56px;border-radius:14px;background:#0a0f1899;border:1px solid var(--border-strong);margin-bottom:1rem;overflow:hidden;box-shadow:0 4px 16px #00000040}.activity-icon-img{width:100%;height:100%;object-fit:cover}.activity-card h3{font-size:1rem;font-weight:600;margin-bottom:.4rem}.activity-card p{font-size:.84rem;color:var(--text-muted);line-height:1.5}.activity{padding:1rem 0 2rem;max-width:min(760px,100%);margin:0 auto;width:100%}.activity.vmc-lesson,.activity.prop-system-page{max-width:min(920px,100%)}.activity-header{display:flex;align-items:center;gap:1rem;margin-bottom:1.5rem;flex-wrap:wrap;padding-bottom:1rem;border-bottom:1px solid var(--border)}.activity-header h2{flex:1 1 12rem;min-width:0;font-family:var(--font-display);font-size:clamp(1.15rem,4vw,1.5rem);font-weight:600;line-height:1.25;overflow-wrap:anywhere}.lesson-pptx-btn{flex-shrink:0}.badge{font-family:var(--mono);font-size:.75rem;background:var(--bg-elevated);border:1px solid var(--border);padding:.35rem .7rem;border-radius:6px;color:var(--text-muted)}.btn-ghost{color:var(--text-muted);font-size:.88rem;font-weight:500;transition:color .15s}.btn-ghost:hover{color:var(--text)}.btn-primary{background:linear-gradient(135deg,#c9a227,#a88620);color:#0a0f18;font-weight:600;padding:.75rem 1.5rem;border-radius:10px;transition:filter .15s,transform .1s;border:1px solid rgba(255,255,255,.1)}.btn-primary:hover{filter:brightness(1.08)}.btn-primary:active{transform:scale(.98)}.btn-secondary{background:var(--bg-elevated);color:var(--text);border:1px solid var(--border-strong);font-weight:500;padding:.75rem 1.25rem;border-radius:10px}.btn-lg{padding:.95rem 2rem;font-size:1rem}.progress-bar{height:3px;background:var(--bg-elevated);border-radius:2px;margin-bottom:1.5rem}.progress-fill{height:100%;background:linear-gradient(90deg,var(--accent),#e8c547);border-radius:2px;transition:width .3s}.start-screen,.win-screen{text-align:center;padding:3rem 2rem;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg)}.start-screen h3,.win-screen h3{font-family:var(--font-display);font-size:1.5rem;margin-bottom:.75rem}.start-screen p,.win-screen p{color:var(--text-secondary);margin-bottom:1.75rem;max-width:420px;margin-left:auto;margin-right:auto;line-height:1.6}.start-label{font-family:var(--mono);font-size:.7rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin-bottom:.75rem}.quiz-question h3{font-size:1.15rem;line-height:1.55;font-weight:500}.choices{display:flex;flex-direction:column;gap:.65rem}.choice{display:flex;align-items:flex-start;gap:.85rem;text-align:left;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:1rem 1.15rem;transition:border-color .15s,background .15s;width:100%}.choice:hover:not(:disabled){border-color:var(--border-strong);background:var(--bg-card-hover)}.choice.correct{border-color:#22c55e80;background:#22c55e14}.choice.wrong{border-color:#ef444480;background:#ef444414}.choice-letter{font-family:var(--mono);font-weight:600;color:var(--accent);flex-shrink:0}.feedback{margin-top:1.25rem;padding:1.25rem;background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border)}.feedback-correct{color:var(--success);font-weight:600;margin-bottom:.5rem}.feedback-wrong{color:var(--error);font-weight:600;margin-bottom:.5rem}.feedback-exp{color:var(--text-secondary);font-size:.92rem;line-height:1.55;margin-bottom:1rem}.results-card{text-align:center;padding:2.5rem;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);margin-bottom:1.5rem}.results-card.pass{border-color:#22c55e59}.results-card.fail{border-color:#ef44444d}.results-score{font-family:var(--font-display);font-size:3.5rem;font-weight:600;margin-bottom:.5rem}.results-badge{display:inline-block;margin-top:.75rem;font-weight:600;font-size:.9rem}.review-answer{font-size:.95rem;margin:.4rem 0;padding:.6rem .85rem;border-radius:8px;line-height:1.45}.review-answer-wrong{background:#ef44441a;border:1px solid rgba(239,68,68,.3);color:#fca5a5}.review-answer-correct{background:#22c55e1a;border:1px solid rgba(34,197,94,.3);color:#86efac}.review-label{font-weight:600;margin-right:.35rem}.feedback-answers{margin-bottom:.75rem}.answer-review{margin-bottom:1.5rem}.answer-review-title{font-size:1rem;margin-bottom:.75rem;color:var(--text-secondary);font-weight:500}.review-all-correct{text-align:center;color:var(--success);margin-bottom:1.5rem}.review-hint{color:var(--text-muted);font-size:.9rem;margin-bottom:1.25rem;line-height:1.5}.review-list{display:flex;flex-direction:column;gap:.65rem;margin-bottom:1.5rem}.review-item{padding:1rem 1.1rem;border-radius:var(--radius);border:1px solid var(--border);background:var(--bg-card)}.review-item.wrong{border-left:3px solid var(--error)}.review-q{font-size:.92rem;margin-bottom:.35rem;font-weight:500}.review-exp{font-size:.85rem;color:var(--text-muted);line-height:1.5}.flashcard{perspective:1000px;height:300px;margin-bottom:1.5rem;cursor:pointer}.flashcard.flashcard-tall{height:min(440px,68vh)}.flashcard-inner{position:relative;width:100%;height:100%;transition:transform .55s cubic-bezier(.4,0,.2,1);transform-style:preserve-3d}.flashcard.flipped .flashcard-inner{transform:rotateY(180deg)}.flashcard-front,.flashcard-back{position:absolute;inset:0;backface-visibility:hidden;background:var(--bg-card);border:1px solid var(--border-strong);border-radius:var(--radius-lg);padding:2rem;display:flex;flex-direction:column;justify-content:center;align-items:center;text-align:center;box-shadow:0 8px 32px #00000040}.flashcard-back{transform:rotateY(180deg);background:var(--bg-elevated);align-items:stretch;text-align:left}.card-label{font-family:var(--mono);font-size:.7rem;text-transform:uppercase;letter-spacing:.1em;color:var(--accent);margin-bottom:1rem}.flashcard-front p{font-family:var(--font-display);font-size:1.5rem;line-height:1.35}.tap-hint{position:absolute;bottom:1.25rem;font-size:.78rem;color:var(--text-muted)}.flashcard-back-scroll{overflow-y:auto;flex:1;padding-right:.25rem}.flashcard-back-scroll p{font-size:.92rem;line-height:1.6;color:var(--text-secondary);margin-bottom:.65rem}.card-nav{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:1rem}.card-counter{font-family:var(--mono);color:var(--text-muted);font-size:.88rem}.card-actions{display:flex;gap:.75rem}.memory-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:.75rem}.memory-card{aspect-ratio:1;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);font-size:.82rem;padding:.6rem;color:var(--text);transition:all .2s}.memory-card:not(.revealed){background:linear-gradient(145deg,#1a2438,#111827);font-family:var(--font-display);font-size:1.35rem;color:var(--accent)}.memory-card.matched{border-color:var(--success);opacity:.65}.memory-card-inner{display:flex;align-items:center;justify-content:center;height:100%;text-align:center;line-height:1.3}.recall-prompt{margin-bottom:1.25rem;padding:1.5rem 1.75rem;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg)}.recall-prompt p{font-size:1.08rem;line-height:1.55;font-weight:500}.study-guide{max-width:900px}.study-title{font-family:var(--font-display);font-size:1.35rem;margin-bottom:1.25rem}.study-pdf-block{margin-bottom:1.5rem}.study-pdf-btn{margin-bottom:1rem}.study-pdf-frame{width:100%;height:70dvh;min-height:min(400px,55dvh);border:1px solid var(--border);border-radius:var(--radius);background:#fff}.study-chart-img{height:auto;min-height:unset;max-height:none;object-fit:contain;display:block}.study-intro{color:var(--text-secondary);line-height:1.65;margin-bottom:1.5rem;padding:1.25rem 1.5rem;background:var(--bg-card);border-radius:var(--radius);border:1px solid var(--border)}.study-table-section{margin-bottom:2rem}.study-table-section h4{font-size:1rem;font-weight:600;margin-bottom:.5rem}.match-instruction{color:var(--text-muted);margin-bottom:1rem;font-size:.9rem}.study-section{margin-bottom:.5rem;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:var(--bg-card)}.study-section-header{width:100%;display:flex;justify-content:space-between;align-items:center;padding:1rem 1.2rem;font-weight:600;font-size:.95rem;text-align:left}.study-section-header:hover{background:var(--bg-card-hover)}.study-chevron{font-family:var(--mono);color:var(--accent)}.study-section-body{padding:0 1.2rem 1.2rem;border-top:1px solid var(--border)}.study-section-body p{color:var(--text-secondary);font-size:.92rem;line-height:1.65;margin-top:.75rem}.combatog-block{margin-bottom:2.5rem;padding:1.5rem 1.6rem;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg)}.combatog-header{margin-bottom:1.5rem}.combatog-eyebrow{display:block;font-family:var(--mono);font-size:.68rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);margin-bottom:.5rem}.combatog-header h4{font-family:var(--font-display);font-size:1.25rem;margin-bottom:.4rem}.combatog-subtitle{color:var(--text-muted);font-size:.9rem;line-height:1.55;margin-bottom:1.25rem}.combatog-acronym{display:flex;flex-wrap:wrap;gap:.45rem;margin-bottom:1rem}.combatog-letter{display:inline-flex;align-items:center;justify-content:center;min-width:2.4rem;height:2.4rem;padding:0 .5rem;font-family:var(--mono);font-weight:700;font-size:1rem;color:var(--accent);background:var(--accent-soft);border:1px solid var(--accent-border);border-radius:8px}.combatog-published{font-size:.9rem;color:var(--text-secondary)}.combatog-published strong{color:var(--text);font-family:var(--font-display)}.combatog-list{list-style:none;display:flex;flex-direction:column;gap:.85rem}.combatog-item{padding:1rem 1.1rem;background:var(--bg-elevated);border:1px solid var(--border);border-radius:var(--radius);border-left:3px solid var(--accent)}.combatog-item-head{display:flex;align-items:flex-start;gap:.75rem;margin-bottom:.5rem}.combatog-item-letter{flex-shrink:0;display:inline-flex;align-items:center;justify-content:center;width:2rem;height:2rem;font-family:var(--mono);font-weight:700;font-size:.95rem;color:var(--accent);background:var(--bg-card);border:1px solid var(--accent-border);border-radius:6px}.combatog-item-head strong{font-size:.95rem;line-height:1.4;padding-top:.15rem}.combatog-detail{font-size:.88rem;color:var(--text-secondary);line-height:1.6;margin-bottom:.65rem}.combatog-baron58{font-size:.85rem;color:var(--text-secondary);line-height:1.6;padding:.75rem .9rem;background:#1e40af1f;border:1px solid rgba(30,64,175,.25);border-radius:8px}.combatog-baron58-tag{display:inline-block;font-family:var(--mono);font-size:.65rem;letter-spacing:.08em;text-transform:uppercase;color:#93c5fd;margin-right:.5rem;font-weight:600}.vmc-factors .study-table-section{margin-top:.5rem}@media(max-width:480px){.combatog-block{padding:1.1rem 1rem}.combatog-letter{min-width:2.1rem;height:2.1rem;font-size:.9rem}}.vmc-lesson .lesson-objective{padding:1.15rem 1.25rem;background:var(--accent-soft);border:1px solid var(--accent-border);border-radius:var(--radius);margin-bottom:1.5rem;line-height:1.6;font-size:.92rem}.lesson-block{margin-bottom:2rem;padding-bottom:1.5rem;border-bottom:1px solid var(--border)}.lesson-block:last-child{border-bottom:none}.lesson-block h3{font-family:var(--font-display);font-size:clamp(1.05rem,3.5vw,1.2rem);margin-bottom:.85rem;line-height:1.3;overflow-wrap:anywhere}.lesson-block-alert{padding:1.15rem 1.25rem;background:#ef444414;border:1px solid rgba(239,68,68,.25);border-radius:var(--radius-lg)}.lesson-lead{font-size:1.05rem;font-weight:500;margin-bottom:.65rem}.lesson-why{margin-top:.5rem;font-size:.88rem;color:var(--text-secondary);line-height:1.55}.lesson-summary{margin-top:1rem;padding:.9rem 1rem;background:var(--bg-elevated);border-radius:var(--radius);font-size:.9rem;line-height:1.6}.lesson-airspeed-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:.75rem}.lesson-airspeed-card{padding:.9rem 1rem;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);border-top:2px solid var(--accent)}.lesson-airspeed-name{font-family:var(--mono);font-size:.75rem;color:var(--accent);text-transform:uppercase;letter-spacing:.06em}.lesson-airspeed-val{display:block;font-family:var(--font-display);font-size:1.5rem;margin:.25rem 0}.lesson-airspeed-note{font-size:.82rem;color:var(--text-muted)}.lesson-subheading{margin:1.75rem 0 .75rem;font-family:var(--font-display);font-size:1.05rem;font-weight:600;color:var(--accent)}.lesson-airspeed-table{margin-top:.5rem}.lesson-factors-divider{margin-top:2.5rem;padding-top:1.75rem;border-top:1px solid var(--border)}.lesson-factors-divider .lesson-subheading{margin-top:0}.lesson-glossary-note{margin-top:.85rem;padding:.75rem 1rem;background:var(--bg-card);border-left:3px solid var(--accent);border-radius:0 var(--radius) var(--radius) 0;font-size:.9rem;line-height:1.55;color:var(--text-muted)}.lesson-glossary-note strong{color:var(--accent)}.past-lesson-grid{display:flex;flex-direction:column;gap:.85rem;margin:1rem 0}.past-lesson-card{padding:1rem 1.1rem;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);border-left:3px solid #1e40af}.past-lesson-head{display:flex;align-items:center;gap:.75rem;margin-bottom:.5rem}.past-lesson-letter{width:2.25rem;height:2.25rem;display:flex;align-items:center;justify-content:center;font-family:var(--mono);font-weight:700;font-size:1.1rem;color:var(--accent);background:var(--bg-elevated);border:1px solid var(--accent-border);border-radius:8px}.past-effect{display:block;font-size:.75rem;color:var(--text-muted);margin-top:.15rem}.past-lesson-card p{font-size:.88rem;color:var(--text-secondary);line-height:1.55;margin-bottom:.4rem}.lesson-vmc-link{color:var(--text)!important;padding:.5rem .65rem;background:#c9a2271a;border-radius:6px;margin-top:.35rem!important}.lesson-teach{font-style:italic;font-size:.85rem!important;color:var(--accent)!important;margin-top:.5rem!important}.lesson-factor-table{width:100%;border-collapse:collapse;font-size:.85rem}.lesson-wide-table{min-width:520px;font-size:.8rem}.lesson-factor-table th,.lesson-factor-table td{padding:.65rem .75rem;border:1px solid var(--border);text-align:left;vertical-align:top}.lesson-factor-table th{background:var(--bg-elevated);font-weight:600}.lesson-factor-table tbody tr:nth-child(2n) td{background:#ffffff05}.lesson-steps{list-style:none;display:flex;flex-direction:column;gap:1rem}.lesson-steps li{padding:1rem 1.1rem;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);counter-increment:lesson-step}.lesson-steps li strong{display:block;margin-bottom:.4rem;color:var(--text)}.lesson-steps li p{font-size:.88rem;color:var(--text-secondary);line-height:1.55}.lesson-recovery-list,.lesson-errors,.lesson-teach-script{margin:.75rem 0 0 1.25rem;line-height:1.7;font-size:.9rem;color:var(--text-secondary)}.lesson-recovery-list li,.lesson-teach-script li{margin-bottom:.35rem}@media(max-width:768px){.lesson-airspeed-grid{grid-template-columns:1fr 1fr}.lesson-factor-table{font-size:.8rem}.lesson-factor-table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;margin-left:calc(-1*max(1rem,env(safe-area-inset-left)));margin-right:calc(-1*max(1rem,env(safe-area-inset-right)));padding-left:max(1rem,env(safe-area-inset-left));padding-right:max(1rem,env(safe-area-inset-right));border-radius:0}.lesson-block-sel,.lesson-block-mel,.lesson-block-both{padding-left:.75rem}.prop-system-diagram-wrap{padding:.75rem}}@media(max-width:480px){.lesson-airspeed-grid{grid-template-columns:1fr}}.vmc-table-section-wrap{margin-bottom:1rem}.vmc-table-toolbar{margin-bottom:.75rem}.vmc-reference-img{width:100%;border-radius:var(--radius);border:1px solid var(--border);margin-bottom:1rem}.lesson-oei-loss{margin-top:1.25rem;padding:1rem 1.1rem;border-radius:var(--radius);background:#c9a22714;border:1px solid rgba(201,162,39,.25)}.lesson-oei-loss h4{margin:0 0 .5rem;font-size:1rem}.prop-system-diagram-wrap{margin-bottom:1.5rem;padding:1rem;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface)}.prop-system-diagram-img{width:100%;height:auto;display:block;border-radius:var(--radius);border:1px solid var(--border)}.prop-photo-caption{margin-top:.75rem;font-size:.92rem}.prop-photo-credit{margin:.35rem 0 0;font-size:.78rem;color:var(--text-muted);font-style:italic}.prop-photo-credits-footer{margin-top:1.5rem;padding-top:1rem;border-top:1px solid var(--border)}.prop-system-diagram-wrap h3{margin:0 0 .5rem;font-size:1rem}.lesson-airframe-tag{display:inline-block;margin:.35rem 0 .65rem;padding:.2rem .55rem;border-radius:999px;font-size:.72rem;font-weight:700;letter-spacing:.03em;text-transform:uppercase;max-width:100%;overflow-wrap:anywhere;line-height:1.35}.lesson-airframe-tag-sel{color:#1d4ed8;background:#1d4ed81a;border:1px solid rgba(29,78,216,.25)}.lesson-airframe-tag-mel{color:#b45309;background:#b453091a;border:1px solid rgba(180,83,9,.25)}.lesson-airframe-tag-both{color:var(--accent);background:#c9a2271a;border:1px solid rgba(201,162,39,.25)}.lesson-airframe-highlight{margin-top:.5rem;padding:.75rem 1rem;border-left:3px solid var(--accent);background:#c9a2270f}.lesson-block-sel{border-left:3px solid rgba(29,78,216,.35);padding-left:1rem}.lesson-block-mel{border-left:3px solid rgba(180,83,9,.35);padding-left:1rem}.lesson-block-both{border-left:3px solid rgba(201,162,39,.35);padding-left:1rem}.lesson-inline-photo{margin:.75rem 0 1rem}.vmc-stall-chart-section{margin-bottom:1.5rem}.vmc-stall-chart-points{margin:0 0 1rem;padding-left:1.25rem;color:var(--text-muted);font-size:.92rem;line-height:1.55}.vmc-stall-chart-points li{margin-bottom:.35rem}.vmc-table-wrap{overflow-x:auto;border-radius:var(--radius);border:1px solid var(--border)}.vmc-table{width:100%;border-collapse:collapse;font-size:.82rem;min-width:520px}.vmc-table-wide{min-width:900px}.vmc-table th{background:#0f1a2e;color:#e2e8f0;font-weight:600;padding:.75rem .6rem;text-align:left;font-size:.75rem;text-transform:uppercase;letter-spacing:.05em}.vmc-table td{padding:.65rem .55rem;border:1px solid rgba(255,255,255,.06);vertical-align:top;line-height:1.4;color:#0f172a}.vmc-table tbody tr{cursor:pointer;transition:filter .15s}.vmc-table tbody tr:hover{filter:brightness(1.04)}.vmc-row-blue td{background:#dbeafe}.vmc-row-green td{background:#dcfce7}.vmc-row-orange td{background:#ffedd5}.vmc-row-white td{background:#f8fafc}.vmc-good{font-weight:600;color:#15803d!important}.vmc-factor,.vmc-bold{font-weight:600}.vmc-notes{max-width:220px;font-size:.78rem}.vmc-highlight{color:#dc2626;font-weight:600}.vmc-detail-panel{padding:1.25rem;background:var(--bg-card);border:1px solid var(--border);border-radius:0 0 var(--radius) var(--radius)}.vmc-detail-panel h4{margin-bottom:.75rem;color:var(--accent)}.vmc-detail-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem}.vmc-detail-label{display:block;font-size:.72rem;text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin-bottom:.35rem;font-weight:600}.vmc-detail-panel p{font-size:.9rem;line-height:1.55;color:var(--text-secondary)}.vmc-tap-hint{margin-top:.75rem;font-size:.8rem;color:var(--text-muted)}@media(max-width:1024px){.page-content,.modules-section{padding-left:1.5rem;padding-right:1.5rem}.module-grid{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}.activity-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr))}}@media(max-width:768px){.site-nav{padding:.75rem max(1rem,env(safe-area-inset-left)) .75rem max(1rem,env(safe-area-inset-right));gap:.65rem}.site-brand-text span{display:none}.site-nav-back{padding:.55rem .85rem;min-height:44px}.hero{min-height:58vh;min-height:58dvh}.hero-content,.modules-section,.page-content{padding-left:max(1rem,env(safe-area-inset-left));padding-right:max(1rem,env(safe-area-inset-right))}.hero-content{padding-top:2.5rem;padding-bottom:2.5rem}.hero-lead{font-size:1rem}.hero-stats{gap:1.5rem}.modules-section{padding-top:2.5rem;padding-bottom:3rem}.module-grid{grid-template-columns:1fr;gap:1.25rem}.module-card-media{height:180px}.module-hero{min-height:220px}.module-hero-text{padding:1.5rem 1.25rem}.metrics-row{grid-template-columns:1fr;gap:.75rem}.metric{padding:1rem 1.15rem}.metric-value{font-size:1.65rem}.activity-grid{grid-template-columns:1fr 1fr;gap:.75rem}.activity-card{padding:1.1rem;min-height:44px}.activity-card-icon{width:48px;height:48px}.activity-header{align-items:stretch}.activity-header .btn-ghost{align-self:flex-start;min-height:44px}.activity-header h2{width:100%;flex-basis:100%}.lesson-pptx-btn{width:100%;text-align:center}.activity-header h2{font-size:1.25rem}.activity{padding-left:0;padding-right:0}.choice{padding:.9rem 1rem;min-height:48px}.btn-primary,.btn-secondary{min-height:44px}.flashcard{height:min(280px,52dvh)}.flashcard.flashcard-tall{height:min(380px,62dvh)}.flashcard-front,.flashcard-back{padding:1.25rem}.flashcard-front p{font-size:1.2rem}.card-nav{flex-direction:column;align-items:stretch}.card-actions{width:100%;justify-content:stretch}.card-actions button{flex:1}.memory-grid{grid-template-columns:repeat(3,1fr);gap:.5rem}.memory-card{font-size:.75rem;min-height:44px}.study-pdf-frame{height:55dvh;min-height:280px}.study-section-header{padding:.9rem 1rem;min-height:44px}.vmc-detail-grid{grid-template-columns:1fr}.vmc-table-wrap{-webkit-overflow-scrolling:touch;margin-left:calc(-1*max(1rem,env(safe-area-inset-left)));margin-right:calc(-1*max(1rem,env(safe-area-inset-right)));padding-left:max(1rem,env(safe-area-inset-left));padding-right:max(1rem,env(safe-area-inset-right));border-radius:0;border-left:none;border-right:none}.results-card{padding:1.75rem 1.25rem}.results-score{font-size:2.75rem}.start-screen,.win-screen{padding:2rem 1.25rem}.site-footer{padding:1.5rem max(1rem,env(safe-area-inset-left)) 1.5rem max(1rem,env(safe-area-inset-right))}}@media(max-width:480px){.site-brand-mark{width:36px;height:36px}.site-brand-text strong{font-size:.88rem}.hero{min-height:50vh;min-height:50dvh}.hero-content{padding-bottom:2rem}.hero-stats{flex-direction:column;gap:1rem}.hero-stats strong{font-size:1.5rem}.section-heading h2{font-size:1.45rem}.module-card-body{padding:1.15rem 1.2rem 1.25rem}.activity-grid{grid-template-columns:1fr}.activity-card h3{font-size:.95rem}.quiz-question h3{font-size:1.05rem}.recall-prompt{padding:1.15rem 1.2rem}.recall-prompt p{font-size:1rem}.memory-grid{grid-template-columns:repeat(2,1fr)}.vmc-table{font-size:.75rem}.vmc-table th,.vmc-table td{padding:.5rem .4rem}}@media(max-width:360px){.site-nav-back span,.site-nav-back{font-size:.8rem}.module-hero h1{font-size:1.5rem}.flashcard-front p{font-size:1.05rem}}@media(max-height:500px)and (orientation:landscape){.hero{min-height:100dvh;align-items:center}.hero-content{padding-top:1.5rem;padding-bottom:1.5rem}.flashcard{height:min(220px,75dvh)}.flashcard.flashcard-tall{height:min(300px,80dvh)}.study-pdf-frame{height:75dvh;min-height:200px}}@media(min-width:1200px){.page-content,.modules-section,.hero-content,.site-footer-inner{max-width:1140px}}@media(hover:none)and (pointer:coarse){.module-card:hover,.activity-card:hover,.instructor-lesson-card:hover{transform:none}.module-card:active,.activity-card:active,.instructor-lesson-card:active{transform:scale(.98);opacity:.95}}.login-overlay{position:fixed;inset:0;z-index:200;display:flex;align-items:center;justify-content:center;padding:max(1rem,env(safe-area-inset-top)) max(1rem,env(safe-area-inset-right)) max(1rem,env(safe-area-inset-bottom)) max(1rem,env(safe-area-inset-left));background:#060a12bf;backdrop-filter:blur(6px);overflow-y:auto;-webkit-overflow-scrolling:touch}.login-modal{width:100%;max-width:380px;padding:2rem;border-radius:16px;border:1px solid var(--border-strong);background:var(--bg-elevated);box-shadow:0 24px 48px #0006;margin:auto}.login-modal h2{font-size:1.35rem;margin-bottom:.5rem}.login-lead{color:var(--text-muted);font-size:.9rem;margin-bottom:1.25rem}.login-label{display:block;font-size:.8rem;font-weight:600;text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);margin-bottom:.4rem}.login-input{width:100%;padding:.75rem 1rem;font-size:1.1rem;letter-spacing:.15em;text-align:center;border-radius:10px;border:1px solid var(--border-strong);background:var(--bg-deep);color:var(--text);margin-bottom:.75rem}.login-error{color:#f87171;font-size:.85rem;margin-bottom:.75rem}.login-actions{display:flex;justify-content:flex-end;gap:.75rem;margin-top:.5rem}.instructor-hub{padding-top:1.5rem}.instructor-hub-header{display:flex;align-items:flex-start;justify-content:space-between;gap:1.5rem;margin-bottom:2rem}.instructor-hub-eyebrow{display:inline-block;font-size:.72rem;font-weight:600;text-transform:uppercase;letter-spacing:.1em;color:var(--accent);margin-bottom:.5rem}.instructor-hub-header h1{font-size:2rem;margin-bottom:.5rem}.instructor-hub-header p{color:var(--text-muted);max-width:540px}.instructor-lesson-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1.25rem}.instructor-lesson-card{text-align:left;padding:1.5rem;border-radius:14px;border:1px solid var(--border);background:var(--bg-elevated);transition:border-color .15s,transform .15s,box-shadow .15s}.instructor-lesson-card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 8px 24px #00000040}.instructor-lesson-tag{display:inline-block;font-size:.7rem;font-weight:600;text-transform:uppercase;letter-spacing:.08em;color:var(--accent);margin-bottom:.65rem}.instructor-lesson-card h3{font-size:1.15rem;margin-bottom:.5rem}.instructor-lesson-card p{font-size:.88rem;color:var(--text-muted);line-height:1.5;margin-bottom:1rem}.instructor-lesson-link{font-size:.85rem;font-weight:600;color:var(--accent)}.lesson-meta{display:flex;flex-wrap:wrap;gap:1rem 2rem;font-size:.88rem;color:var(--text-muted);margin-bottom:1.5rem;padding-bottom:1rem;border-bottom:1px solid var(--border)}.lesson-reference-doc{display:flex;flex-direction:column;gap:.75rem;margin:1rem 0 0}.lesson-reference-image{width:100%;max-width:100%;margin-top:.5rem;border-radius:10px;border:1px solid var(--border-strong);background:#fff}.lesson-factor-table-wrap{overflow-x:auto;-webkit-overflow-scrolling:touch;max-width:100%}.endorsement-scenario-tabs{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:1.25rem}.endorsement-tab{font-size:.78rem;font-weight:500;padding:.45rem .85rem;border-radius:999px;border:1px solid var(--border);color:var(--text-secondary);background:var(--bg-deep);transition:border-color .15s,background .15s,color .15s}.endorsement-tab.active{border-color:var(--accent);background:#c9a2271f;color:var(--accent)}.endorsement-card{padding:1rem 1.15rem;margin-bottom:1rem;border-radius:10px;border:1px solid var(--border);background:var(--bg-deep)}.endorsement-card-head{display:flex;align-items:center;justify-content:space-between;gap:1rem;margin-bottom:.35rem}.endorsement-card-head strong{color:var(--accent);font-size:.95rem}.endorsement-ac{font-size:.75rem;color:var(--text-muted)}.endorsement-card h4{font-size:.95rem;margin-bottom:.5rem}.endorsement-sample{font-size:.88rem;line-height:1.55;font-style:italic;color:var(--text-secondary);padding-left:.75rem;border-left:3px solid var(--accent)}.endorsement-acs-ref{margin:.75rem 0 1.25rem;padding:.85rem 1rem;background:#c9a22714;border:1px solid rgba(201,162,39,.25);border-radius:var(--radius);font-size:.9rem;line-height:1.55}.endorsement-acs-ref p+p{margin-top:.35rem}.logbook-section{margin:1rem 0 1.25rem;padding:.85rem 1rem;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);border-left:3px solid #1e40af}.logbook-section-title{margin:0 0 .4rem;font-size:.95rem;font-weight:600;color:var(--text)}.logbook-section-ref{margin:0 0 .6rem;font-size:.82rem;color:var(--text-muted);line-height:1.45}.logbook-section-list{margin-top:.35rem;margin-bottom:0}@media(max-width:768px){.site-nav-actions{flex-wrap:wrap;justify-content:flex-end}.instructor-hub-header,.endorsement-scenario-tabs{flex-direction:column}.endorsement-tab{text-align:left;min-height:44px}.instructor-hub-header h1{font-size:clamp(1.5rem,6vw,2rem)}.instructor-lesson-grid{grid-template-columns:1fr}.instructor-lesson-card{min-height:44px}.login-modal{padding:1.5rem 1.25rem}.login-actions{flex-direction:column-reverse;align-items:stretch}.login-actions button{width:100%;min-height:44px}.study-intro{padding:1rem 1.1rem;font-size:.92rem}.lesson-recovery-list,.lesson-errors,.lesson-teach-script{margin-left:1rem;padding-right:.25rem}.endorsement-card-head{flex-direction:column;align-items:flex-start}}@media(max-width:480px){.site-nav-auth{width:100%;justify-content:flex-end;flex-wrap:wrap;gap:.5rem}.site-nav-login,.site-nav-logout{font-size:.78rem;padding:.5rem .75rem}.lesson-wide-table{min-width:480px;font-size:.72rem}.lesson-factor-table th,.lesson-factor-table td{padding:.5rem .45rem}.prop-photo-caption{font-size:.85rem}.lesson-airframe-highlight{padding:.65rem .75rem;font-size:.88rem}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important}}:root{--bg-deep: #060a12;--bg: #0a0f18;--bg-elevated: #111827;--bg-card: #151d2e;--bg-card-hover: #1a2438;--surface: #151d2e;--text: #f1f5f9;--text-secondary: #94a3b8;--text-muted: #64748b;--accent: #c9a227;--accent-soft: rgba(201, 162, 39, .15);--accent-border: rgba(201, 162, 39, .35);--navy: #1e3a5f;--success: #22c55e;--error: #ef4444;--border: rgba(255, 255, 255, .07);--border-strong: rgba(255, 255, 255, .12);--radius: 12px;--radius-lg: 18px;--shadow: 0 24px 80px rgba(0, 0, 0, .45);--font: "Inter", "Segoe UI", system-ui, sans-serif;--font-display: "Playfair Display", Georgia, serif;--mono: "IBM Plex Mono", "Consolas", monospace}*{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;text-size-adjust:100%;overflow-x:hidden;color-scheme:dark}body{font-family:var(--font);background:var(--bg-deep);color:var(--text);min-height:100vh;min-height:100dvh;line-height:1.6;overflow-x:hidden;overflow-wrap:break-word;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-webkit-tap-highlight-color:rgba(201,162,39,.2);padding-left:env(safe-area-inset-left);padding-right:env(safe-area-inset-right);padding-bottom:env(safe-area-inset-bottom)}#root{min-height:100vh;min-height:100dvh}button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit;touch-action:manipulation;-webkit-touch-callout:none}button,input,select,textarea{font-size:max(16px,1rem)}img{display:block;max-width:100%;height:auto}a{color:inherit;text-decoration:none}::selection{background:#c9a22759;color:#fff}