:root { color-scheme: light; --paper:#f5f9fd; --ink:#173551; --muted:#637e95; --line:#d7e4ee; --blue:#2467bd; --cloud:#e7f0f9; }
* { box-sizing:border-box; }
body { margin:0; background:var(--paper); color:var(--ink); font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif; }
header,footer { max-width:1140px; margin:auto; padding:30px 40px; display:flex; justify-content:space-between; gap:20px; align-items:center; font-size:13px; color:var(--muted); }
header a { color:var(--ink); font-size:20px; font-weight:650; letter-spacing:-.7px; text-decoration:none; }
main { max-width:1140px; margin:65px auto 90px; padding:0 40px; display:grid; grid-template-columns:1fr 1.2fr; align-items:center; gap:65px; }
.eyebrow { font:12px/1.5 ui-monospace,monospace; color:var(--blue); letter-spacing:1.5px; }
h1 { font-family:"Songti SC","STSong",Georgia,serif; font-size:clamp(34px,4vw,48px); font-weight:500; letter-spacing:-1px; line-height:1.5; margin:20px 0; }
.description { max-width:340px; font-size:15px; line-height:1.9; color:var(--muted); }
.route { display:flex; align-items:center; gap:20px; margin-top:32px; font-size:12px; }
.route i { font-style:normal; color:var(--blue); font-size:32px; }
.conversation { border:1px solid var(--line); border-radius:20px; overflow:hidden; background:#fff; }
form { padding:30px; }
label,.reply-label { display:block; font-size:12px; font-weight:650; color:var(--muted); margin:0 0 18px; }
textarea { width:100%; display:block; resize:vertical; min-height:106px; border:0; border-bottom:1px solid var(--line); border-radius:0; font-family:inherit; font-size:21px; line-height:1.7; color:var(--ink); background:transparent; padding:8px 0 20px; }
.form-footer { display:flex; align-items:center; justify-content:space-between; gap:14px; margin-top:23px; }
.form-footer>span { font-size:11px; color:var(--muted); }
button { border:0; border-radius:8px; background:var(--blue); color:#fff; font:inherit; font-size:13px; padding:13px 15px; cursor:pointer; white-space:nowrap; }
button span { margin-left:8px; }
button:disabled { cursor:wait; opacity:.55; }
button:hover:not(:disabled) { background:#18549f; }
:focus-visible { outline:3px solid #8bbced; outline-offset:5px; }
.reply { min-height:244px; background:var(--cloud); padding:30px; position:relative; }
.reply::before { content:""; position:absolute; top:-10px; left:40px; border-left:10px solid transparent; border-right:10px solid transparent; border-bottom:10px solid var(--cloud); }
.reply-message { font-family:"Songti SC","STSong",Georgia,serif; font-size:24px; line-height:1.6; overflow-wrap:anywhere; margin:0 0 25px; }
dl { margin:0; font-size:12px; display:grid; grid-template-columns:1fr 1fr; gap:15px; }
dl[hidden] { display:none; }
dt { color:var(--muted); margin-bottom:6px; }
dd { margin:0; font-size:12px; }
.request { grid-column:1/-1; }
.request dd { font-family:ui-monospace,monospace; font-size:11px; overflow-wrap:anywhere; }
footer { border-top:1px solid var(--line); }
footer a { color:var(--blue); text-decoration:none; }
@media(max-width:800px) { main { grid-template-columns:1fr; gap:30px; margin:20px auto 48px; } .intro { max-width:520px; } .description { max-width:460px; } .route { margin-top:15px; } }
@media(max-width:450px) { header,footer { padding:24px; } header>span { font-size:10px; } main { padding:0 24px; } form,.reply { padding:24px; } .form-footer { align-items:flex-start; flex-direction:column; } button { width:100%; } footer { align-items:flex-start; flex-direction:column; gap:12px; } }