:root { font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif; color: #111827; line-height: 1.5; background: #f8fafc; }
* { box-sizing: border-box; }
body { margin: 0; }
a { color: #1d4ed8; }
button, a { -webkit-tap-highlight-color: transparent; }
button:focus-visible, a:focus-visible, video:focus-visible, summary:focus-visible { outline: 3px solid #2563eb; outline-offset: 4px; }
.skip-link { position: absolute; z-index: 100; top: 8px; left: 16px; transform: translateY(-150%); padding: 12px 16px; background: white; color: #1d4ed8; border: 2px solid #1d4ed8; border-radius: 8px; }
.skip-link:focus { transform: translateY(0); }
.container { max-width: 1200px; margin: 0 auto; padding-left: 24px; padding-right: 24px; }
.header { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 16px 24px; background: white; border-bottom: 1px solid #e2e8f0; }
.header nav { display: flex; gap: 20px; align-items: center; }
.header nav > a { text-decoration: none; font-weight: 600; }
.brand { color: #000; font-size: 23px; font-weight: 800; text-decoration: none; white-space: nowrap; }
.brand span, .brand-word > span { color: #ef4444; }
.brand-word { color: #000; white-space: nowrap; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 44px; padding: 12px 20px; border-radius: 8px; background: #1d4ed8; color: #fff; text-decoration: none; font-weight: 700; }
.button:hover { background: #1e40af; }
.intro { padding-top: 48px; padding-bottom: 28px; text-align: center; }
.eyebrow { display: inline-block; color: #166534; background: #dcfce7; border: 1px solid #86efac; border-radius: 999px; padding: 8px 18px; font-size: 14px; font-weight: 800; letter-spacing: 0.1em; margin: 0 0 16px; }
h1 { font-size: clamp(30px, 4vw, 46px); line-height: 1.2; margin: 0 0 16px; }
.lead { font-size: 20px; font-weight: 600; color: #166534; max-width: 760px; margin: 0 auto 16px; }
.intro > .note { color: #1f2937; font-size: 16px; line-height: 1.7; max-width: 800px; margin: 0 auto; padding: 14px 20px; border: 1px solid #bbf7d0; border-radius: 12px; background: #f0fdf4; }
.note { color: #475569; font-size: 14px; }
.tour-layout { display: grid; grid-template-columns: minmax(0, 1.7fr) minmax(300px, 1fr); gap: 24px; align-items: start; }
.player-card { padding: 24px; background: #fff; border: 1px solid #e2e8f0; border-radius: 16px; box-shadow: 0 8px 30px rgba(15,23,42,.06); }
.player-heading { display: flex; justify-content: space-between; color: #15803d; font-size: 12px; font-weight: 700; letter-spacing: .06em; }
h2 { font-size: 21px; line-height: 1.4; margin: 12px 0 18px; }
video { display: block; width: 100%; aspect-ratio: 40 / 21; background: #0f172a; border-radius: 10px; object-fit: contain; }
#demo-description { color: #334155; margin-bottom: 8px; }
.written-walkthrough { margin: 16px 0; border: 1px solid #e2e8f0; border-radius: 8px; padding: 12px 16px; color: #334155; }
.written-walkthrough summary { cursor: pointer; font-weight: 600; color: #166534; }
.written-walkthrough ol { padding-left: 24px; }
.written-walkthrough li + li { margin-top: 8px; }
.error { color: #b91c1c; background: #fef2f2; padding: 12px; border-radius: 8px; }
.playlist h2 { margin-top: 0; font-size: 18px; }
.demo-list { display: grid; gap: 10px; }
.demo-choice { display: grid; grid-template-columns: 96px minmax(0, 1fr); align-items: center; gap: 12px; width: 100%; padding: 12px; border: 1px solid #e2e8f0; border-radius: 12px; background: white; text-align: left; font: inherit; cursor: pointer; color: #111827; }
.demo-choice:hover { border-color: #93c5fd; background: #eff6ff; }
.demo-choice[aria-pressed="true"] { border-color: #2563eb; background: #eff6ff; box-shadow: inset 3px 0 #2563eb; }
.demo-choice img { width: 96px; height: 54px; object-fit: cover; border-radius: 6px; }
.demo-choice strong { display: block; font-size: 14px; line-height: 1.35; }
.demo-step, .demo-time { display: block; color: #475569; font-size: 11px; }
.demo-step { margin-bottom: 4px; letter-spacing: .03em; }
.demo-time { margin-top: 4px; }
.getting-started { text-align: center; margin-top: 48px; margin-bottom: 48px; }
.getting-started > p { max-width: 800px; margin: 16px auto; color: #475569; }
footer { padding: 48px 0 24px; background: #111827; color: #9ca3af; font-size: 14px; }
.footer-grid { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 32px; }
.footer-brand { display: inline-block; padding: 4px 12px; background: white; border-radius: 8px; }
footer h3 { color: #fff; margin: 0 0 16px; font-size: 16px; }
footer ul { list-style: none; margin: 0; padding: 0; }
footer li + li { margin-top: 8px; }
footer li a { text-decoration: none; color: #9ca3af; }
footer li a:hover { color: #fb7185; }
.copyright { margin-top: 32px; padding-top: 24px; border-top: 1px solid #374151; text-align: center; }
@media (max-width: 860px) { .tour-layout { grid-template-columns: 1fr; } .demo-list { grid-template-columns: repeat(2,minmax(0,1fr)); } }
@media (max-width: 560px) { .header { padding: 12px 16px; gap: 8px; } .header nav { gap: 12px; font-size: 13px; } .header .button { padding: 10px 12px; } .brand { font-size: 20px; } .container { padding-left: 16px; padding-right: 16px; } .intro { padding-top: 32px; } .player-card { padding: 16px; } .demo-list { grid-template-columns: 1fr; } .footer-grid { grid-template-columns: 1fr; text-align: center; } }