:root {
    color-scheme: light dark;
    --bg: #ffffff;
    --fg: #1d1d1f;
    --muted: #6e6e73;
    --line: #e5e5ea;
    --accent: #007aff;
}

@media (prefers-color-scheme: dark) {
    :root {
        --bg: #161618;
        --fg: #f5f5f7;
        --muted: #a1a1a6;
        --line: #2c2c2e;
        --accent: #0a84ff;
    }
}

* { box-sizing: border-box; }

body {
    margin: 0;
    background: var(--bg);
    color: var(--fg);
    font: 16px/1.65 -apple-system, BlinkMacSystemFont, "PingFang SC", "Helvetica Neue", sans-serif;
}

main {
    max-width: 720px;
    margin: 0 auto;
    padding: 56px 16px 72px;
}

header { display: flex; align-items: center; gap: 16px; margin-bottom: 32px; }
header img { width: 72px; height: 72px; }
header h1 { margin: 0; font-size: 32px; }
header p { margin: 4px 0 0; color: var(--muted); }

h2 { margin-top: 40px; font-size: 21px; }
section + section { border-top: 1px solid var(--line); margin-top: 40px; }
a { color: var(--accent); }
ul { padding-left: 22px; }
.muted { color: var(--muted); font-size: 14px; }
nav { margin-top: 48px; font-size: 14px; color: var(--muted); }
nav a { margin-right: 16px; }

/* 首页 */
.home { max-width: 860px; }
.hero { text-align: center; padding: 24px 0 8px; }
.hero img { border-radius: 24px; }
.hero h1 { margin: 16px 0 0; font-size: 44px; letter-spacing: -0.02em; }
.tagline { margin: 12px 0 4px; font-size: 21px; text-wrap: balance; }
.button {
    display: inline-block;
    margin-top: 24px;
    padding: 13px 28px;
    border-radius: 999px;
    background: var(--accent);
    color: #fff;
    font-size: 17px;
    font-weight: 600;
    text-decoration: none;
}
.button:hover { filter: brightness(1.08); }
.button:focus-visible { outline: 3px solid var(--fg); outline-offset: 3px; }
.meta { margin-top: 12px; }

.layouts {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    padding-top: 40px;
}
.layouts figure { margin: 0; text-align: center; }
.layouts figcaption { margin-top: 8px; font-size: 14px; color: var(--muted); }
.screen {
    display: grid;
    gap: 4px;
    aspect-ratio: 16 / 10;
    padding: 6px;
    border: 1px solid var(--line);
    border-radius: 10px;
}
.screen i {
    border-radius: 4px;
    background: var(--accent);
    opacity: 0.22;
    border-top: 5px solid var(--accent);
}
.screen i:first-child { opacity: 0.55; }
.cols-2 { grid-template-columns: 1fr 1fr; }
.cols-3 { grid-template-columns: 1fr 1fr 1fr; }
.one-two { grid-template-columns: 1fr 1fr; grid-template-rows: 1fr 1fr; }
.one-two i:first-child { grid-row: span 2; }
.quad { grid-template-columns: 1fr 1fr; grid-template-rows: 1fr 1fr; }

.features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.features h3 { margin: 0 0 4px; font-size: 17px; }
.features p { margin: 0; }
ol { padding-left: 22px; }
ol li { margin: 6px 0; }
code { font: 0.92em ui-monospace, "SF Mono", Menlo, monospace; }

@media (max-width: 640px) {
    .hero h1 { font-size: 34px; }
    .tagline { font-size: 18px; }
    .layouts { grid-template-columns: repeat(2, 1fr); }
    .features { grid-template-columns: 1fr; }
}