/* Lesson 1: a focused AI-video production workbook. */
.lesson1-page{width:min(1440px,calc(100% - 40px))}.lesson1-page main{padding:20px 0 94px}.lesson1-page .crumb{margin:6px 0 24px}.lesson1-hero{max-width:940px;padding:20px 0 52px;border-bottom:1px solid #2b3c5b}.lesson1-kicker{color:#8deee3;font:700 12px/1.2 ui-monospace,"SFMono-Regular",monospace;letter-spacing:.08em}.lesson1-hero h1{max-width:920px;margin:17px 0;font-size:clamp(43px,5vw,76px);line-height:1.08;letter-spacing:-.06em}.lesson1-hero h1 span{color:#82e6df}.lesson1-hero p{max-width:690px;margin:0;color:#adbbd5;font-size:17px;line-height:1.8}.lesson1-meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:24px}.lesson1-meta span{border:1px solid #344968;border-radius:999px;padding:7px 10px;color:#c3d1e8;font-size:12px}.lesson1-layout{display:grid;grid-template-columns:220px minmax(0,1fr) 210px;gap:38px;align-items:start;margin-top:34px}.lesson1-toc{position:sticky;top:18px;padding:16px 14px;border:1px solid #30435f;border-radius:16px;background:#0b1324}.toc-title{padding:2px 7px 13px;color:#f3f6ff;font-size:16px;font-weight:800}.lesson1-toc a{display:block;padding:8px 7px;border-radius:8px;color:#9fb0cc;font-size:13px;line-height:1.35}.lesson1-toc a:hover,.lesson1-toc a.active{background:#65f8dd14;color:#79f4e4}.lesson1-toc a[data-level="3"]{padding-left:17px;color:#8293b2;font-size:12px}.toc-actions{display:grid;gap:8px;margin-top:16px;padding-top:16px;border-top:1px solid #2b3d59}.toc-actions>*{min-height:37px;padding:9px;text-align:center;font-size:12px}.lesson1-content{min-width:0;color:#d9e2f0;font-size:16px;line-height:1.92}.lesson1-loading{padding:28px;border:1px solid #30435f;border-radius:14px;color:#b7c9e6}.lesson1-section{margin:0 0 64px;scroll-margin-top:26px}.lesson1-section>h2{max-width:800px;margin:0 0 18px;color:#f3f7ff;font-size:clamp(28px,3vw,42px);line-height:1.2;letter-spacing:-.035em}.lesson1-section>h2::before{content:"";display:block;width:36px;height:2px;margin:0 0 15px;background:#75eadf}.lesson1-section h3{margin:38px 0 12px;color:#eaf1fc;font-size:22px;line-height:1.35;scroll-margin-top:24px}.lesson1-content p{max-width:780px;margin:0 0 16px;color:#c0cce0}.lesson1-content .lesson1-intro{padding:26px 28px;margin-bottom:42px;border:1px solid #34536d;border-radius:18px;background:linear-gradient(135deg,#12344e,#10182c 72%)}.lesson1-content .lesson1-intro h2{margin-top:0;color:#82ebe0}.lesson1-content .lesson1-intro h2::before{display:none}.lesson1-content .lesson1-intro p{margin-bottom:0;color:#d4e4f0}.lesson1-callout{max-width:780px;margin:18px 0;padding:15px 18px;border-left:3px solid #8be4dc;background:#65f8dd0c;color:#def6f0}.lesson1-figure{margin:26px 0 38px}.lesson1-figure img{display:block;width:100%;height:auto;border:1px solid #344b6d;border-radius:13px;background:#101a2c}.lesson1-figure figcaption{margin-top:9px;color:#8fa2c0;font-size:12px}.lesson1-prompt{max-width:820px;margin:20px 0 30px;border:1px solid #365674;border-radius:15px;background:#091220;overflow:hidden}.lesson1-prompt-head{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:11px 14px;border-bottom:1px solid #29425d;background:#11243a}.lesson1-prompt-head span{color:#9ec9df;font:700 12px ui-monospace,"SFMono-Regular",monospace;letter-spacing:.04em}.lesson1-copy{flex:none;border:1px solid #4c7992;border-radius:8px;background:#69e8df;color:#061720;padding:6px 10px;font-size:12px;font-weight:800}.lesson1-copy:hover{background:#d8ff75}.lesson1-prompt pre{max-height:460px;margin:0;padding:18px;overflow:auto;white-space:pre-wrap;color:#d8e8f8;font:13px/1.85 ui-monospace,"SFMono-Regular",monospace}.lesson1-prompt details summary{cursor:pointer;padding:11px 18px;border-top:1px solid #29425d;color:#86f0e2;font-size:13px}.lesson1-prompt details:not([open]) pre{display:none}.lesson1-rail{position:sticky;top:18px;display:grid;gap:13px}.rail-card{padding:17px;border:1px solid #2d4661;border-radius:15px;background:#0c1628}.rail-card span{display:block;margin-bottom:8px;color:#7ee9de;font-size:12px;font-weight:800}.rail-card strong{display:block;color:#edf5ff;font-size:17px;line-height:1.4}.rail-card p,.rail-card li{color:#9fb1cd;font-size:13px;line-height:1.65}.rail-card p{margin:10px 0 0}.rail-tools ul{margin:0;padding-left:18px}.rail-tools li+li{margin-top:4px}.rail-complete{min-height:42px;border:1px solid #86eee3;border-radius:10px;background:#65f8dd;color:#061820;font-weight:900}.rail-complete.done{border-color:#d8ff75;background:#d8ff75}.lesson1-page .lesson1-toast{position:fixed;z-index:110;right:20px;bottom:20px;padding:12px 15px;border:1px solid #6ce9df;border-radius:10px;background:#0c1729;color:#ecffff;box-shadow:0 14px 45px #0008;font-size:13px;opacity:0;transform:translateY(15px);transition:.22s}.lesson1-page .lesson1-toast.show{opacity:1;transform:none}@media(max-width:1120px){.lesson1-layout{grid-template-columns:205px minmax(0,1fr)}.lesson1-rail{display:none}}@media(max-width:760px){.lesson1-page{width:min(100% - 28px,1440px)}.lesson1-page .links{display:none}.lesson1-hero{padding-bottom:34px}.lesson1-hero h1{font-size:42px}.lesson1-layout{display:block;margin-top:24px}.lesson1-toc{position:static;margin-bottom:28px}.lesson1-toc #lesson1-toc-links{display:flex;gap:5px;overflow:auto;padding-bottom:4px}.lesson1-toc a{flex:0 0 auto;border:1px solid #2c405d}.lesson1-toc a[data-level="3"]{display:none}.toc-actions{grid-template-columns:1fr 1fr}.lesson1-content{font-size:15px}.lesson1-section{margin-bottom:48px}.lesson1-section>h2{font-size:30px}.lesson1-section h3{font-size:20px}.lesson1-content .lesson1-intro{padding:20px}.lesson1-prompt pre{max-height:380px;padding:15px;font-size:12px}.lesson1-figure{margin:20px 0 30px}}@media(prefers-reduced-motion:reduce){.lesson1-page *{scroll-behavior:auto!important;transition:none!important}}
/* Lesson 1 final layout: mirrors the Lesson 2 reading surface without changing lesson copy. */
.lesson1-hero{max-width:none;display:grid;grid-template-columns:minmax(0,1fr) minmax(270px,360px);gap:clamp(30px,5vw,72px);align-items:center;padding:40px 0 52px}
.lesson1-hero-copy{min-width:0}
.lesson1-cover{align-self:center;margin:0;border:1px solid #57e8dc;border-radius:25px;overflow:hidden;background:#0a1425;box-shadow:0 22px 60px #0006}
.lesson1-cover img{display:block;width:100%;aspect-ratio:1/1;object-fit:cover}
.lesson1-cover figcaption{padding:12px 18px;color:#72ece0;font:700 12px/1 ui-monospace,"SFMono-Regular",monospace;letter-spacing:.14em}
.lesson1-prompt{position:relative;max-width:820px;margin:22px 0 34px;border:1px solid #395875;border-radius:14px;background:#091220;overflow:hidden;padding:0!important}
.lesson1-prompt-head{position:absolute;z-index:1;top:0;right:0;left:0;display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:52px;box-sizing:border-box;margin:0!important;padding:13px 15px;border-bottom:1px solid #29425d;background:#13283d;color:#a7d5ee;font:700 13px/1.2 ui-monospace,"SFMono-Regular",monospace;letter-spacing:.045em}
.lesson1-prompt-head span{min-width:0;overflow:hidden;color:#a7d5ee;font:700 13px/1.2 ui-monospace,"SFMono-Regular",monospace;letter-spacing:.045em;text-overflow:ellipsis;white-space:nowrap}
.lesson1-copy{flex:none;border:1px solid #4d8298;border-radius:8px;background:#69e8df;color:#061720;padding:8px 12px;font-size:12px;font-weight:900}
.lesson1-copy:hover{background:#d8ff75}
.lesson1-prompt pre{max-height:480px;box-sizing:border-box;margin:0!important;padding:72px 20px 20px!important;overflow:auto;white-space:pre-wrap;color:#d8e8f8;font:13px/1.85 ui-monospace,"SFMono-Regular",monospace}
@media(max-width:760px){.lesson1-hero{display:block;padding-top:24px}.lesson1-cover{max-width:440px;margin-top:30px}.lesson1-prompt pre{max-height:400px;padding:16px;font-size:12px}.lesson1-prompt-head{padding:12px 14px}}