:root { color-scheme: light; font-family: system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif; color: #223b32; background: #f2f6f3; }
* { box-sizing: border-box; }
body { margin: 0; padding: 24px 16px 40px; }
.install-card { max-width: 460px; margin: 0 auto; padding: 28px 24px 16px; background: #fff; border: 1px solid #e0e9e2; border-radius: 24px; box-shadow: 0 12px 42px #163d2110; }
header { text-align: center; }
.app-icon { display: block; margin: 0 auto 12px; }
.badge { display: inline-block; border-radius: 6px; background: #eff4ec; color: #4b6335; font-size: .875rem; line-height: 1.6; padding: 2px 9px; }
h1 { font-size: clamp(1.35rem, 5.6vw, 1.65rem); line-height: 1.45; margin: 12px 0 6px; overflow-wrap: anywhere; }
.subtitle { margin: 0 0 26px; color: #617168; font-size: 1rem; }
.download-button { display: flex; align-items: center; justify-content: center; gap: 12px; width: 100%; min-height: 72px; padding: 16px 12px; border-radius: 16px; background: #137448; color: #fff; text-decoration: none; font-size: 1.375rem; font-weight: 700; line-height: 1.5; box-shadow: 0 5px 12px #13744822; }
.download-button svg { flex-shrink: 0; fill: none; stroke: currentColor; stroke-width: 2; stroke-linecap: round; stroke-linejoin: round; }
.download-button:hover { background: #0d603a; }
.download-button:focus-visible, summary:focus-visible { outline: 3px solid #21865a; outline-offset: 5px; }
.download-button:active { background: #0b5032; }
[hidden] { display: none !important; }
.file-note { margin: 12px 0 25px; text-align: center; color: #63726b; font-size: .875rem; line-height: 1.7; overflow-wrap: anywhere; }
h2 { margin: 0 0 17px; font-size: 1.125rem; line-height: 1.6; }
.steps { list-style: none; margin: 0; padding: 0; }
.steps li { display: flex; align-items: flex-start; gap: 12px; font-size: 1rem; line-height: 1.8; margin-bottom: 16px; }
.step-number { display: flex; align-items: center; justify-content: center; flex-shrink: 0; width: 28px; height: 28px; background: #edf5ef; color: #137448; font-size: .875rem; font-weight: 700; border-radius: 50%; }
strong { font-weight: 650; }
.completion-tip { margin: 20px 0 23px; padding: 15px; background: #f4f7f4; border-radius: 12px; color: #43584d; font-size: 1rem; line-height: 1.8; }
.notice { background: #fff4dc; border: 1px solid #f1dbab; border-radius: 12px; padding: 14px; margin: 0 0 18px; color: #654b20; font-size: 1rem; line-height: 1.8; }
.download-feedback { font-size: 1rem; line-height: 1.8; color: #137448; margin: 16px 0 0; }
details { border-top: 1px solid #e8ede9; }
summary { cursor: pointer; padding: 17px 2px; font-size: 1rem; line-height: 1.5; }
.details-body { padding-bottom: 18px; color: #52665a; font-size: 1rem; line-height: 1.8; }
.details-body h3 { font-size: 1rem; color: #223b32; margin: 8px 0; }
.details-body ol { padding-left: 1.5em; }
.details-body p { margin: 12px 0; }
dl { margin: 0; }
dt { font-weight: 650; color: #334d3e; margin-top: 14px; }
dd { margin-left: 0; }
.checksum { overflow-wrap: anywhere; font-family: ui-monospace, monospace; font-size: .875rem; }
@media (max-width: 360px) { body { padding: 12px 10px 28px; } .install-card { padding: 22px 18px 12px; border-radius: 18px; } }
@media (min-width: 700px) { body { padding-top: 56px; } }