@font-face { font-family: 'Inter Tight'; src: url('media/InterTight-VF.ttf') format('truetype'); font-weight: 100 900; font-display: swap; }
:root { --bg: #0f3b3a; --deep: #0a2c2b; --teal: #5fb7b0; --mint: #cfe9e4; --ink: #eaf5f2; --muted: rgba(234, 245, 242, 0.7); --line: rgba(207, 233, 228, 0.18); }
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; color: var(--ink); background: radial-gradient(120% 70% at 50% 0%, #17504e 0%, var(--bg) 45%, var(--deep) 100%) fixed, var(--deep);
  font: 400 17px/1.55 'Inter Tight', system-ui, sans-serif; }
.wrap { max-width: 1120px; margin: 0 auto; padding: 0 16px 56px; }
@media (min-width: 700px) { .wrap { padding: 0 32px 72px; } }
.top { padding: 36px 0 22px; }
.logo { width: 140px; height: auto; display: block; filter: brightness(0) invert(1) opacity(.92); }
.eyebrow { margin: 26px 0 6px; color: var(--teal); font-weight: 600; font-size: 13px; letter-spacing: .14em; text-transform: uppercase; }
h1 { margin: 0 0 12px; font-weight: 750; font-size: clamp(36px, 6vw, 68px); line-height: 1; letter-spacing: -0.03em; }
.lede { margin: 0; max-width: 62ch; color: var(--muted); font-size: 18px; }
.player { margin: 22px 0 30px; }
.player video { display: block; width: 100%; height: auto; aspect-ratio: 16 / 9; border-radius: 16px; background: #000;
  box-shadow: 0 24px 70px rgba(0, 0, 0, .45), 0 0 0 1px var(--line); }
.chapters h2 { font-size: 22px; margin: 0 0 12px; letter-spacing: -0.01em; }
.chapters ol { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: 1fr; gap: 6px; }
@media (min-width: 640px) { .chapters ol { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 980px) { .chapters ol { grid-template-columns: repeat(3, 1fr); } }
.chapters a { display: flex; gap: 12px; align-items: baseline; padding: 10px 14px; border-radius: 10px; border: 1px solid var(--line);
  color: var(--ink); text-decoration: none; background: rgba(255, 255, 255, .03); transition: background .2s, border-color .2s; }
.chapters a span { min-width: 3.2em; color: var(--teal); font-variant-numeric: tabular-nums; font-weight: 600; }
.chapters a:hover, .chapters a:focus-visible { background: rgba(95, 183, 176, .14); border-color: rgba(95, 183, 176, .5); }
.chapters a.on { background: var(--mint); color: var(--deep); border-color: var(--mint); }
.chapters a.on span { color: var(--deep); }
.note { margin: 28px 0 0; color: var(--muted); font-size: 14px; max-width: 80ch; }
.eyebrow a { color: var(--mint); }
.alt { margin: 18px 0 0; font-size: 16px; }
.alt a { color: var(--mint); font-weight: 650; text-decoration-thickness: 2px; text-underline-offset: 3px; }
.alt a:hover { color: #fff; }
.alt span { color: var(--muted); }
/* progression (v3 page) */
.progress { margin: 56px 0 0; border-top: 1px solid var(--line); padding-top: 34px; }
.progress > h2 { font-size: clamp(28px, 4vw, 40px); margin: 0 0 6px; letter-spacing: -0.02em; }
.progress .sub { margin: 0 0 30px; color: var(--muted); }
.step { margin: 0 0 44px; padding: 22px; border: 1px solid var(--line); border-radius: 18px; background: rgba(255, 255, 255, .025); }
@media (min-width: 700px) { .step { padding: 28px; } }
.step-head { display: flex; gap: 18px; align-items: flex-start; margin-bottom: 16px; }
.num { font-weight: 800; font-size: 44px; line-height: .9; color: var(--teal); font-variant-numeric: tabular-nums; }
.step .tag { margin: 2px 0 4px; color: var(--teal); font-weight: 600; font-size: 13px; letter-spacing: .12em; text-transform: uppercase; }
.step h3 { margin: 0; font-size: clamp(24px, 3.2vw, 34px); letter-spacing: -0.02em; line-height: 1.05; }
.step video { display: block; width: 100%; height: auto; aspect-ratio: 16 / 9; border-radius: 12px; background: #000; margin: 6px 0 16px; box-shadow: 0 0 0 1px var(--line); }
.step p { margin: 0 0 12px; max-width: 78ch; }
.proc { margin: 16px 0 6px; }
.proc img { display: block; width: 100%; height: auto; border-radius: 10px; box-shadow: 0 0 0 1px var(--line); }
.proc figcaption, .proc figure figcaption { margin-top: 8px; font-size: 14px; color: var(--muted); }
.proc figure { margin: 0; }
.proc.two { display: grid; grid-template-columns: 1fr; gap: 16px; }
@media (min-width: 900px) { .proc.two { grid-template-columns: 1fr 1fr; } }
.fixes { margin: 4px 0 14px; padding-left: 20px; max-width: 78ch; }
.fixes li { margin: 3px 0; }
.links a { color: var(--mint); font-weight: 650; text-decoration-thickness: 2px; text-underline-offset: 3px; }