.phone { position: relative; width: 350px; height: 720px; border-radius: 52px; background: var(--gray-900); padding: 10px; }
.screen { position: relative; width: 100%; height: 100%; border-radius: 43px; overflow: hidden; background: var(--gray-40); }
.sb { position: absolute; left: 0; right: 0; top: 0; height: 58px; z-index: 5; background: linear-gradient(var(--gray-40) 55%, color-mix(in srgb, var(--gray-40) 0%, transparent)); display: flex; align-items: center; justify-content: space-between; padding: 6px 30px 0 34px; font-size: 15px; font-weight: 550; color: var(--gray-900); }
.island { position: absolute; top: 11px; left: 50%; width: 110px; height: 32px; margin-left: -55px; border-radius: 9999px; background: var(--gray-900); z-index: 6; }
.sb i { display: inline-block; width: 24px; height: 11px; border-radius: 4px; border: 1.5px solid var(--gray-900); position: relative; }
.sb i::after { content: ""; position: absolute; inset: 1.5px 5px 1.5px 1.5px; background: var(--gray-900); border-radius: 2px; }
/* ── 15. Mobile drill-down (website on a phone) ──────── */
.s15 { height: 800px; background: linear-gradient(180deg, var(--gray-70), var(--gray-100)); display: grid; place-items: center; }
.s15 .screen { background: var(--gray-0); }
.md-h { position: absolute; left: 0; right: 0; top: 44px; height: 48px; z-index: 6; display: flex; align-items: center; padding: 0 18px; gap: 18px; color: var(--gray-810); }
.md-h svg { width: 18px; height: 18px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; display: block; }
.md-h button { border: 0; background: none; padding: 0; cursor: default; color: inherit; display: grid; place-items: center; width: 28px; height: 28px; }
.md-glyph, .md-back { position: absolute; left: 16px; top: 10px; transition: opacity .25s, transform .35s cubic-bezier(.2,.9,.25,1); }
.md-back { opacity: 0; transform: translateX(8px); pointer-events: none; }
.md-open .md-glyph { opacity: 0; }
.md-deep .md-back { opacity: 1; transform: none; pointer-events: auto; }
.md-r { margin-left: auto; display: flex; gap: 18px; align-items: center; }
.md-r .fade { transition: opacity .2s; }
.md-open .md-r .fade { opacity: 0; pointer-events: none; }
.md-burger i { position: relative; width: 18px; height: 10px; display: block; }
.md-burger i::before, .md-burger i::after { content: ""; position: absolute; left: 0; right: 0; height: 1.5px; border-radius: 2px; background: currentColor; transition: transform .4s cubic-bezier(.7,0,.3,1), top .4s cubic-bezier(.7,0,.3,1); }
.md-burger i::before { top: 1px; } .md-burger i::after { top: 7.5px; }
.md-open .md-burger i::before { top: 4.25px; transform: rotate(45deg); } .md-open .md-burger i::after { top: 4.25px; transform: rotate(-45deg); }
.md-page { position: absolute; inset: 92px 0 0; overflow: hidden; text-align: center; }
.md-page h3 { margin: 40px 0 0; font-size: 40px; font-weight: 550; letter-spacing: -0.02em; }
.md-page p { margin: 8px 0 0; font-size: 20px; color: var(--gray-810); }
.md-page .ln { margin-top: 14px; display: flex; gap: 20px; justify-content: center; color: var(--blue-500); font-size: 15px; }
.md-page .dev { width: 220px; height: 280px; margin: 40px auto 0; border-radius: 34px; border: 8px solid var(--gray-810); background: conic-gradient(from 220deg at 60% 45%, var(--orange-250), var(--yellow-150), var(--aqua-200), var(--blue-350), var(--violet-350), var(--orange-250)); }
.md-menu { position: absolute; inset: 0; z-index: 5; background: var(--gray-0); opacity: 0; pointer-events: none; transition: opacity .25s ease; }
.md-open .md-menu { opacity: 1; pointer-events: auto; transition: opacity .2s ease; }
.md-lv { position: absolute; left: 0; right: 0; top: 104px; padding: 0 44px; }
.md-lv .md-i { opacity: 0; transform: translateY(-8px); transition: opacity .12s ease, transform .12s ease; }
.md-lv.on .md-i { opacity: 1; transform: none; transition: opacity .3s ease calc(var(--d) * 28ms + 60ms), transform .5s cubic-bezier(.2,.9,.25,1) calc(var(--d) * 28ms + 60ms); }
.md-lv.left .md-i { opacity: 0; transform: translateX(-24px); transition: opacity .15s ease, transform .3s cubic-bezier(.4,0,.2,1); }
.md-lv.right .md-i { opacity: 0; transform: translateX(24px); transition: none; }
.md-lv.on.fromr .md-i { transition: opacity .32s ease calc(var(--d) * 25ms + 100ms), transform .55s cubic-bezier(.2,.9,.25,1) calc(var(--d) * 25ms + 100ms); }
.md-big { display: block; width: 100%; text-align: left; border: 0; background: none; padding: 5px 0; font-size: 24px; line-height: 1.2; font-weight: 550; letter-spacing: -0.01em; color: var(--gray-810); cursor: default; }
.md-h5 { margin: 0 0 10px; font-size: 15px; color: var(--gray-500); }
.md-sm { margin: 16px 0 8px; font-size: 13px; color: var(--gray-500); }
.md-s { display: block; font-size: 15px; font-weight: 550; color: var(--gray-700); padding: 5px 0; }