:root {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    color: #181818;
    background: #fff;
    font-synthesis: none;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    min-width: 320px;
    min-height: 100vh;
    background: #fff;
}

.nav-shell {
    width: min(640px, calc(100% - 40px));
    margin: 0 auto;
}

.nav-header {
    height: 64px;
    display: flex;
    align-items: center;
    border-bottom: 1px solid #e5e5e5;
    font-size: 15px;
    font-weight: 650;
}

main { padding: 56px 0 80px; }

h1 {
    margin: 0 0 24px;
    font-size: 30px;
    line-height: 1.25;
    letter-spacing: -.02em;
}

.tool-list { display: grid; }

.tool-item {
    min-height: 88px;
    padding: 20px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    border: 1px solid #d8d8d8;
    border-radius: 6px;
    color: #181818;
    text-decoration: none;
}

.tool-item:hover, .tool-item:focus-visible {
    outline: none;
    border-color: #181818;
    background: #fafafa;
}

.tool-item strong, .tool-item small { display: block; }
.tool-item strong { font-size: 15px; font-weight: 650; }
.tool-item small { margin-top: 7px; color: #666; font-size: 12px; }
@media (max-width: 560px) {
    .nav-shell { width: min(640px, calc(100% - 28px)); }
    .nav-header { height: 56px; }
    main { padding: 38px 0 56px; }
    h1 { margin-bottom: 20px; font-size: 26px; }
    .tool-item { min-height: 82px; padding: 17px; }
}