:root { color-scheme: light dark; --bg: #f7f8fa; --surface: #fff; --ink: #192b3c; --muted: #526475; --line: #dce3e9; --accent: #175fae; }
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font-family: -apple-system, BlinkMacSystemFont, "PingFang TC", "Microsoft JhengHei", sans-serif; line-height: 1.8; }
a { color: var(--accent); text-underline-offset: 4px; }
a:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; border-radius: 3px; }
.wrap { width: min(100% - 40px, 1000px); margin-inline: auto; }
header { border-bottom: 1px solid var(--line); }
header .wrap { display: flex; align-items: center; justify-content: space-between; gap: 16px; min-height: 76px; }
.brand { font-size: 18px; font-weight: 750; color: var(--ink); text-decoration: none; }
header nav { font-size: 14px; }
.intro { padding: 84px 0 48px; }
.eyebrow { color: var(--accent); font-size: 13px; letter-spacing: .14em; font-weight: 700; }
h1 { font-size: clamp(34px, 5vw, 54px); line-height: 1.25; letter-spacing: -.03em; margin: 18px 0; }
h2 { font-size: 25px; line-height: 1.4; margin: 12px 0; }
p { margin: 0 0 18px; }
.lead { color: var(--muted); font-size: 18px; max-width: 640px; }
.apps { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; padding-bottom: 72px; }
.card { border: 1px solid var(--line); border-radius: 24px; background: var(--surface); padding: 32px; display: flex; flex-direction: column; align-items: flex-start; }
.card p { color: var(--muted); }
.icon { width: 72px; height: 72px; border-radius: 17px; margin-bottom: 20px; }
.paper-mark { display: grid; place-items: center; background: #e8f0e5; color: #46633d; font-size: 32px; font-family: serif; }
.tag { color: var(--muted); font-size: 12px; letter-spacing: .06em; }
.links { display: flex; gap: 20px; flex-wrap: wrap; margin-top: auto; padding-top: 12px; }
.primary { font-weight: 650; }
.detail { max-width: 720px; padding: 72px 0; min-height: 65vh; }
.notice { margin: 32px 0; padding: 28px; border: 1px solid var(--line); border-radius: 18px; background: var(--surface); }
.notice h2 { font-size: 20px; margin-top: 0; }
footer { border-top: 1px solid var(--line); padding: 24px 0; font-size: 13px; color: var(--muted); }
footer .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px; }
@media (max-width: 600px) { .apps { grid-template-columns: 1fr; } .intro { padding-top: 48px; } .card { padding: 26px; } header .wrap { min-height: 68px; } .detail { padding-top: 44px; } }
@media (prefers-color-scheme: dark) { :root { --bg: #141b22; --surface: #1c2630; --ink: #edf2f7; --muted: #b0becc; --line: #354452; --accent: #86baff; } .paper-mark { background: #30482f; color: #d1e9c6; } }