:root{color-scheme:dark;--bg:#090b12;--panel:#111623;--panel2:#171e2d;--ink:#f4ead8;--muted:#b9b1a8;--dim:#8d8990;--line:rgba(255,255,255,.12);--gold:#d6b75c;--gold-soft:rgba(214,183,92,.13);--rose:#ce6e8f;--teal:#70b8ad;--good:#a9d2a1;--danger:#f0a6a6;--max:1320px}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:radial-gradient(circle at 18% -4%,rgba(111,69,115,.24),transparent 30rem),radial-gradient(circle at 88% 10%,rgba(65,115,118,.12),transparent 30rem),var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.68}
button,textarea{font:inherit}
button{cursor:pointer}
a{color:var(--gold);text-underline-offset:3px}
a:hover{color:#f1d993}
img{max-width:100%}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.site-topline{max-width:var(--max);margin:auto;padding:23px 30px 18px;display:flex;align-items:center;justify-content:space-between;gap:20px}
.brand{display:inline-flex;align-items:center;gap:12px;color:var(--gold);text-decoration:none;text-transform:uppercase;letter-spacing:.12em;font:700 .78rem/1.2 Georgia,serif}
.brand:hover{color:#f2d78f}
.brand-mark{display:grid;place-items:center;width:34px;height:34px;border:1px solid rgba(214,183,92,.48);border-radius:50%;font:italic 1.35rem Georgia,serif;letter-spacing:0}
.course-kind{border:1px solid rgba(214,183,92,.3);background:var(--gold-soft);border-radius:999px;color:var(--gold);padding:7px 13px;font-size:.73rem;font-weight:700;text-transform:uppercase;letter-spacing:.08em;white-space:nowrap}
.progress-strip{position:sticky;top:0;z-index:30;display:flex;align-items:center;justify-content:flex-end;gap:16px;padding:10px max(30px,calc((100vw - var(--max))/2 + 30px));border-block:1px solid var(--line);background:rgba(9,11,18,.94);backdrop-filter:blur(16px)}
.progress-track{width:min(260px,38vw);height:6px;border-radius:99px;overflow:hidden;background:#2a2b37}
.progress-fill{width:0;height:100%;border-radius:99px;background:linear-gradient(90deg,var(--teal),var(--gold),var(--rose));transition:width .25s}
#progress-text{font-size:.76rem;color:var(--muted);white-space:nowrap}
.site-shell{max-width:var(--max);margin:auto;padding:34px 30px 95px;display:grid;grid-template-columns:260px minmax(0,1fr);gap:48px;align-items:start}
.course-sidebar{position:sticky;top:72px;border:1px solid var(--line);border-radius:14px;background:linear-gradient(180deg,#151b29,#0e1320);overflow:hidden;box-shadow:0 20px 70px rgba(0,0,0,.18)}
.sidebar-top{padding:22px 22px 18px;border-bottom:1px solid var(--line)}
.sidebar-label,.eyebrow,.feature-tag,.check-eyebrow,.workbook-kicker{font-size:.72rem;text-transform:uppercase;letter-spacing:.15em;font-weight:800;color:var(--gold)}
.sidebar-top strong{display:block;margin:10px 0 6px;font:1.3rem/1.2 Georgia,serif}
.sidebar-top p{margin:0;color:var(--dim);font-size:.79rem;line-height:1.5}
.course-sidebar nav{padding:10px;display:grid;gap:2px}
.lesson-tab{width:100%;display:flex;align-items:center;gap:11px;border:1px solid transparent;border-radius:8px;background:transparent;color:var(--muted);text-align:left;padding:10px 11px;font-size:.84rem;transition:background .15s,border-color .15s,color .15s}
.lesson-tab:hover{background:#20283a;color:var(--ink)}
.lesson-tab[aria-current="step"]{background:rgba(214,183,92,.12);border-color:rgba(214,183,92,.35);color:var(--ink)}
.tab-number{font:700 .72rem Georgia,serif;color:var(--gold);opacity:.85}
.tab-title{flex:1}
.tab-check{display:none;color:var(--good);font-weight:800}
.lesson-tab.is-complete .tab-check{display:inline}
.sidebar-foot{border-top:1px solid var(--line);padding:17px 22px 20px;font:italic .89rem/1.4 Georgia,serif;color:var(--dim)}
main{min-width:0}
.lesson-panel{max-width:910px;animation:appear .25s ease both}
.lesson-panel[hidden]{display:none}
@keyframes appear{from{opacity:.4;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}
.lesson-header{padding:6px 0 26px}
.dot{padding:0 5px;color:var(--dim)}
.lesson-header h1{font:500 clamp(2.6rem,5.7vw,5.2rem)/.99 Georgia,"Times New Roman",serif;letter-spacing:-.035em;margin:17px 0 0;max-width:820px}
.lesson-lede{font-size:1.14rem;max-width:670px;color:var(--muted);margin:19px 0 0}
.hero-art{height:clamp(220px,35vw,390px);position:relative;overflow:hidden;border:1px solid var(--line);border-radius:16px;margin:3px 0 36px;background:#15222a}
.hero-art img{width:100%;height:100%;object-fit:cover;object-position:center 45%;display:block}
.hero-art-shade{position:absolute;inset:0;background:linear-gradient(90deg,rgba(7,10,17,.45),transparent 60%),linear-gradient(0deg,rgba(7,10,17,.92),transparent 45%)}
.hero-art-caption{position:absolute;bottom:25px;left:26px;max-width:400px;font:italic clamp(1.2rem,2.5vw,1.8rem)/1.25 Georgia,serif;color:#fff}
.lesson-content{max-width:780px}
.lesson-content h2{font:500 clamp(1.8rem,3.6vw,2.5rem)/1.12 Georgia,serif;letter-spacing:-.02em;margin:36px 0 17px;color:var(--ink)}
.lesson-content h2:first-child{margin-top:0}
.lesson-content h3{font:600 clamp(1.25rem,2.3vw,1.6rem)/1.2 Georgia,serif;margin:36px 0 14px;color:#f8e9cc}
.lesson-content h4{font-size:1.07rem;margin:25px 0 10px}
.lesson-content p{color:var(--muted);margin:0 0 17px}
.lesson-content p strong,.lesson-content li strong{color:var(--ink)}
.lesson-content ul,.lesson-content ol{padding-left:24px;color:var(--muted);margin:0 0 20px}
.lesson-content li{padding-left:5px;margin:0 0 8px}
.lesson-content blockquote{margin:24px 0;border-left:3px solid var(--gold);padding:14px 18px;background:var(--gold-soft);border-radius:0 8px 8px 0}
.lesson-content blockquote p{color:var(--ink);font:italic 1.13rem/1.5 Georgia,serif;margin:0}
.lesson-content hr{border:0;border-top:1px solid var(--line);margin:36px 0}
.lesson-content table{width:100%;border-collapse:collapse;border:1px solid var(--line);font-size:.88rem;margin:22px 0 28px;display:block;overflow-x:auto}
.lesson-content th{background:#252a3e;color:var(--ink);text-align:left;font-weight:700}
.lesson-content th,.lesson-content td{border:1px solid var(--line);padding:10px 13px;vertical-align:top;min-width:100px}
.lesson-content td{color:var(--muted)}
.lesson-content tr:nth-child(even) td{background:rgba(255,255,255,.025)}
.lesson-content code{background:#252a38;border:1px solid var(--line);padding:1px 5px;border-radius:4px;font-size:.9em}
.lesson-content pre{overflow-x:auto;background:#111722;border:1px solid var(--line);padding:17px 19px;border-radius:10px;margin:18px 0 26px}
.lesson-content pre code{background:none;border:0;padding:0;font-size:.86rem;white-space:pre-wrap}
.lesson-content img{display:block;max-height:570px;width:auto;border:1px solid var(--line);border-radius:10px;margin:17px 0 26px;object-fit:contain}
.inline-video{display:block;width:min(340px,100%);margin:13px 0 21px}
.inline-video video{display:block;width:100%;aspect-ratio:9/16;object-fit:contain;background:#000;border:1px solid var(--line);border-radius:12px}
.video-caption{display:block;font-size:.8rem;color:var(--dim);padding-top:8px}
.featured-media{display:grid;grid-template-columns:minmax(0,1fr) minmax(210px,300px);gap:24px;align-items:center;background:linear-gradient(135deg,#1d1b2a,#121e28);border:1px solid rgba(214,183,92,.28);border-radius:16px;padding:22px;margin:28px 0}
.featured-media h3{font:500 1.65rem/1.1 Georgia,serif;margin:10px 0}
.featured-media p{margin:0;color:var(--muted)}
.featured-media video{width:100%;aspect-ratio:9/16;max-height:560px;background:#000;border-radius:10px;border:1px solid var(--line)}
.shot-pair{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:20px 0 30px}
.shot-pair.three{grid-template-columns:repeat(3,minmax(0,1fr))}
.shot-pair figure{margin:0;background:var(--panel);border:1px solid var(--line);border-radius:12px;padding:10px;min-width:0}
.shot-pair img{width:100%;height:230px;object-fit:contain;border:0;margin:0;background:#000;border-radius:5px}
.shot-pair figcaption{font-size:.78rem;color:var(--dim);line-height:1.35;padding:8px 2px 2px}
.knowledge-check,.workbook{max-width:780px;margin:35px 0;border:1px solid var(--line);border-radius:15px;background:linear-gradient(180deg,var(--panel2),var(--panel));padding:24px}
.knowledge-check h3,.workbook h3{font:500 1.45rem/1.2 Georgia,serif;margin:9px 0 16px}
.check-options{display:grid;gap:9px}
.check-options button{padding:12px 15px;text-align:left;border:1px solid var(--line);border-radius:8px;background:#101725;color:var(--ink);line-height:1.4}
.check-options button:hover{border-color:var(--gold)}
.check-options button.correct{border-color:var(--good);background:rgba(169,210,161,.1)}
.check-options button.incorrect{border-color:var(--danger);background:rgba(240,166,166,.1)}
.check-options button:disabled{cursor:default}
.check-feedback{margin:12px 0 0;color:var(--muted);font-size:.9rem}
.check-feedback:empty{display:none}
.workbook{border-color:rgba(112,184,173,.3);background:linear-gradient(180deg,#142022,#10191c)}
.workbook-kicker{color:var(--teal)}
.workbook p{color:var(--muted);margin:0 0 15px}
.workbook textarea{display:block;width:100%;resize:vertical;min-height:130px;border:1px solid rgba(112,184,173,.35);border-radius:8px;background:#0a1215;color:var(--ink);padding:13px 14px;outline:none}
.workbook textarea:focus{border-color:var(--teal);box-shadow:0 0 0 3px rgba(112,184,173,.12)}
.save-status{display:block;color:var(--dim);font-size:.77rem;margin-top:8px}
.lesson-actions{display:flex;align-items:center;justify-content:space-between;gap:12px;border-top:1px solid var(--line);padding:27px 0 0;margin:40px 0}
.lesson-actions button{border-radius:8px;padding:11px 16px;font-weight:700;font-size:.86rem;white-space:nowrap}
.lesson-actions .secondary{border:1px solid var(--line);background:transparent;color:var(--muted)}
.lesson-actions .primary{border:1px solid var(--gold);background:var(--gold);color:#19170f}
.lesson-actions .complete-btn{border:1px solid rgba(112,184,173,.6);background:rgba(112,184,173,.12);color:var(--teal)}
.lesson-actions .complete-btn.is-complete{background:rgba(169,210,161,.16);border-color:var(--good);color:var(--good)}
.lesson-actions button:hover:not(:disabled){filter:brightness(1.15)}
.lesson-actions button:disabled{opacity:.35;cursor:default}
.site-footer{max-width:var(--max);margin:auto;padding:28px 30px 48px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;color:var(--dim);font-size:.76rem}
@media(max-width:1050px){.site-shell{grid-template-columns:210px minmax(0,1fr);gap:30px}.lesson-tab{font-size:.78rem}.featured-media{grid-template-columns:minmax(0,1fr) minmax(180px,230px)}}
@media(max-width:760px){.site-shell{display:block;padding:20px 18px 70px}.site-topline{padding:17px 18px}.progress-strip{padding:9px 18px}.course-sidebar{position:static;margin-bottom:29px}.sidebar-top{padding:15px 16px}.sidebar-top strong{font-size:1.04rem}.sidebar-top p,.sidebar-foot{display:none}.course-sidebar nav{display:flex;gap:7px;overflow-x:auto;padding:10px;scrollbar-width:thin}.lesson-tab{flex:0 0 auto;width:auto;padding:8px 10px;border-color:var(--line);font-size:.76rem}.tab-check{margin-left:1px}.lesson-header h1{font-size:clamp(2.5rem,10vw,4rem)}.featured-media{grid-template-columns:1fr}.featured-media video{max-width:300px;margin:auto}.site-footer{padding:26px 18px 42px;display:block}.site-footer span{display:block;margin:4px 0}}
@media(max-width:520px){.course-kind{font-size:.64rem;padding:6px 8px}.brand{font-size:.65rem;letter-spacing:.06em}.brand-mark{width:28px;height:28px}.lesson-content h2{font-size:1.75rem}.shot-pair,.shot-pair.three{grid-template-columns:repeat(2,minmax(0,1fr))}.shot-pair img{height:190px}.lesson-actions{flex-wrap:wrap}.lesson-actions .complete-btn{order:-1;width:100%}.lesson-actions .secondary,.lesson-actions .primary{flex:1}.knowledge-check,.workbook{padding:18px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.lesson-panel{animation:none}.progress-fill{transition:none}}