@font-face{font-family:'Montserrat';font-weight:700;font-style:normal;font-display:swap;src:url(/fonts/Montserrat-700.woff2) format('woff2')}
@font-face{font-family:'Montserrat';font-weight:800;font-style:normal;font-display:swap;src:url(/fonts/Montserrat-800.woff2) format('woff2')}
@font-face{font-family:'Montserrat';font-weight:900;font-style:normal;font-display:swap;src:url(/fonts/Montserrat-900.woff2) format('woff2')}
@font-face{font-family:'Work Sans';font-weight:400;font-style:normal;font-display:swap;src:url(/fonts/WorkSans-400.woff2) format('woff2')}
@font-face{font-family:'Work Sans';font-weight:500;font-style:normal;font-display:swap;src:url(/fonts/WorkSans-500.woff2) format('woff2')}
@font-face{font-family:'Work Sans';font-weight:600;font-style:normal;font-display:swap;src:url(/fonts/WorkSans-600.woff2) format('woff2')}
:root{--ink:#111;--soft:#313131;--muted:#666;--line:#E6E6E6;--surface:#fff;--canvas:#F7F7F7;--signal:#FFDB01}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{margin:0;background:var(--surface);color:var(--ink);font-family:'Work Sans',system-ui,sans-serif;font-size:16px;line-height:24px}
a{color:inherit}
:focus-visible{outline:3px solid var(--ink);outline-offset:3px}
.bar{background:var(--ink);color:#fff}
.bar-in{display:flex;align-items:center;justify-content:space-between;height:56px;max-width:720px;margin:0 auto;padding:0 20px}
.bar a{text-decoration:none}
.mark{font-family:Montserrat,sans-serif;font-weight:900;font-size:16px;letter-spacing:.04em;display:inline-flex;align-items:center}
.mark i{display:inline-block;width:13px;height:13px;border-radius:999px;background:var(--signal);margin:0 1px}
.bar-in span{font-weight:500;font-size:14px}
main{max-width:720px;margin:0 auto;padding:0 20px 56px}
h1,h2{font-family:Montserrat,sans-serif;margin:0;color:var(--ink)}
h1{font-weight:900;font-size:36px;line-height:38px;letter-spacing:-.02em}
h2{font-weight:800;font-size:22px;line-height:26px;letter-spacing:-.01em}
p{margin:0}
.hero{display:flex;flex-direction:column;gap:16px;padding:40px 0 32px}
.hero p{font-size:17px;line-height:26px}
.tip{display:flex;flex-direction:column;gap:10px;padding:28px 0;border-top:1px solid var(--line)}
.links{padding:28px 0 8px;border-top:1px solid var(--line)}
.links h2{margin-bottom:12px}
.links a{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:52px;border-bottom:1px solid var(--line);text-decoration:none;font-weight:600}
.links a span{font-weight:400;font-size:14px;color:var(--muted);flex-shrink:0}
.links a:hover{background:var(--canvas)}
.slides{display:flex;flex-direction:column;gap:12px;text-decoration:none;margin-bottom:40px}
.thumb{position:relative;display:block;aspect-ratio:16/9;border-radius:16px;overflow:hidden;background:var(--ink)}
.thumb img{width:100%;height:100%;object-fit:cover;display:block}
.play{position:absolute;top:16px;right:16px;width:56px;height:56px;border-radius:999px;background:var(--signal);display:flex;align-items:center;justify-content:center}
.slides:hover .play{transform:scale(1.06)}
.cap{display:flex;justify-content:space-between;align-items:center;gap:16px}
.cap b{font-weight:600}
.cap span{font-size:14px;color:var(--muted)}
.next{background:var(--signal);margin:40px -20px 0;padding:32px 20px 40px}
.next>div{max-width:680px;margin:0 auto;display:flex;flex-direction:column;gap:10px}
.next h2{font-weight:900;font-size:24px;line-height:27px;letter-spacing:-.02em}
.lessons{display:flex;flex-direction:column}
.lesson{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:20px 16px;border-bottom:1px solid var(--line);text-decoration:none}
.lesson b{font-family:Montserrat,sans-serif;font-weight:700;font-size:16px}
.lesson span{font-size:14px;color:var(--muted);flex-shrink:0}
.lesson.open{background:var(--signal);border:0;border-radius:16px;margin-bottom:8px;padding:20px 16px}
.lesson.open b{font-weight:800;font-size:18px;line-height:22px;display:block}
.lesson.open small{display:block;font-size:14px;margin-top:4px}
.lesson.open span{color:var(--ink)}
.lesson.open:hover{filter:brightness(.96)}
@media(min-width:720px){h1{font-size:48px;line-height:50px}.next{margin:40px 0 0;border-radius:16px;padding:32px}}

.hero-pic{width:96px;height:96px;border-radius:999px;background:var(--signal);object-fit:contain;mix-blend-mode:normal;padding:8px;margin-bottom:4px}
.tip{flex-direction:row;align-items:flex-start;justify-content:space-between;gap:20px}
.tip-text{display:flex;flex-direction:column;gap:10px;min-width:0}
.pic{width:96px;height:96px;flex-shrink:0;border-radius:999px;background:var(--signal);padding:10px;object-fit:contain}
.tip p a{font-weight:600}
code{font-family:ui-monospace,SFMono-Regular,Menlo,monospace;font-size:.92em;background:var(--canvas);border:1px solid var(--line);border-radius:6px;padding:1px 6px}
@media(max-width:420px){.pic{width:72px;height:72px;padding:8px}}

.challenge{display:flex;flex-direction:column;gap:10px;background:var(--canvas);border:1px solid var(--line);border-radius:16px;padding:24px 20px;margin-top:32px}

html{scroll-behavior:smooth}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}}
.menu{position:sticky;top:0;z-index:10;background:var(--surface);border-bottom:1px solid var(--line)}
.menu-in{display:flex;gap:6px;max-width:720px;margin:0 auto;padding:10px 20px;overflow-x:auto;scrollbar-width:none}
.menu-in::-webkit-scrollbar{display:none}
.menu a{flex-shrink:0;display:inline-flex;align-items:center;height:36px;padding:0 12px;border:1px solid var(--line);border-radius:999px;font-size:14px;font-weight:600;text-decoration:none;white-space:nowrap}
.menu a:hover{background:var(--canvas)}
.menu a.on{background:var(--signal);border-color:var(--signal)}
#slides,#tips,#tools,#challenge,#next{scroll-margin-top:68px}

.next-pic{width:100%;height:auto;aspect-ratio:3/2;object-fit:cover;border-radius:16px;display:block;margin-bottom:6px}
.course-pic{width:100%;height:auto;aspect-ratio:3/2;object-fit:cover;border-radius:16px;display:block;margin:0 0 28px}