:root { color-scheme: light dark; --bg: #f2f9fa; --paper: #fff; --ink: #12343d; --muted: #506b74; --accent: #08788a; --line: #d5e8eb; }
@media (prefers-color-scheme: dark) { :root { --bg: #071c26; --paper: #0e2b38; --ink: #e1f5f7; --muted: #a6c9cf; --accent: #70dcdf; --line: #25434e; } }
* { box-sizing: border-box; }
body { margin: 0; color: var(--ink); background: var(--bg); font: 17px/1.8 system-ui, "PingFang SC", sans-serif; }
a { color: var(--accent); text-underline-offset: .22em; }
a:focus-visible, summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; }
header, main, footer { width: min(100% - 40px, 1040px); margin: auto; }
header { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 16px; padding: 24px 0; }
nav { display: flex; gap: 24px; }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; font-weight: 750; color: var(--ink); }
.brand img { border-radius: 12px; }
.hero { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; padding: 48px 0 64px; }
h1 { font-size: clamp(34px, 6vw, 58px); line-height: 1.2; letter-spacing: -.04em; }
h2 { font-size: 26px; line-height: 1.4; }
p, li { color: var(--muted); }
.eyebrow { color: var(--accent); font-size: 14px; letter-spacing: .12em; }
.hero img { width: 100%; height: auto; border-radius: 20px; }
.button { display: inline-block; background: var(--accent); color: var(--bg); padding: 10px 22px; border-radius: 999px; text-decoration: none; font-weight: 700; }
.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
article, .support, .policy { background: var(--paper); border: 1px solid var(--line); border-radius: 20px; padding: 28px; }
.support { margin: 40px 0; }
details { border-top: 1px solid var(--line); padding: 18px 0; }
summary { cursor: pointer; font-weight: 650; }
.policy { max-width: 800px; margin: 30px auto; }
.policy h1 { font-size: 38px; }
.policy h2 { margin-top: 32px; font-size: 23px; }
footer { padding: 28px 0 40px; border-top: 1px solid var(--line); color: var(--muted); font-size: 14px; }
@media (max-width: 700px) { .hero, .features { grid-template-columns: 1fr; } .hero { padding-top: 16px; gap: 20px; } article, .support, .policy { padding: 22px; } nav { gap: 16px; } }