:root { color-scheme: light dark; --bg:#f5f4ef; --card:#fffefa; --ink:#243b32; --muted:#646d65; --line:#dedfd5; --accent:#224f40; --soft:#edf1e8; --error:#a03c32; --radius:16px; }
* { box-sizing:border-box; }
body { margin:0; background:var(--bg); color:var(--ink); font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif; line-height:1.6; }
button,input,a { -webkit-tap-highlight-color:transparent; }
button,input { font:inherit; font-size:14px; }
button,a.download-file { min-height:44px; padding:10px 16px; border:1px solid transparent; border-radius:10px; cursor:pointer; font-weight:600; transition:background .15s; }
button.primary,.download-file { background:var(--accent); color:#fff; }
button.primary:hover,.download-file:hover { background:#326650; }
button.ghost { border-color:var(--line); background:transparent; color:var(--ink); }
button.ghost:hover { background:var(--soft); }
button.text-button { color:var(--accent); background:transparent; padding:8px; font-weight:500; }
button.small { min-height:40px; padding:6px 14px; }
button.danger { background:var(--error); color:#fff; }
button:disabled { opacity:.5; cursor:wait; }
button:focus-visible,a:focus-visible,input:focus-visible,.modal:focus-visible { outline:3px solid #7d9c75; outline-offset:3px; }
input { width:100%; min-width:0; min-height:46px; padding:10px 12px; border:1px solid var(--line); border-radius:10px; color:var(--ink); background:var(--card); }
input::placeholder { color:#808579; }
input[type=checkbox] { width:18px; min-height:18px; accent-color:var(--accent); }
label { display:block; font-size:13px; margin:12px 0 5px; color:var(--muted); }
.site-header,main,footer { max-width:1000px; margin:0 auto; padding-left:28px; padding-right:28px; }
.site-header { display:flex; justify-content:space-between; align-items:center; padding-top:26px; }
.wordmark { display:inline-flex; gap:6px; align-items:baseline; font-size:26px; font-weight:750; letter-spacing:-1.5px; color:var(--ink); text-decoration:none; }
.brand-dot { width:7px; height:7px; border-radius:50%; background:var(--accent); }
.header-note { color:var(--muted); font-size:12px; }
.intro { padding:36px 0 20px; }
.eyebrow { font-size:11px; font-weight:600; letter-spacing:.08em; color:var(--muted); margin:0 0 10px; }
h1 { font-size:clamp(30px,4.3vw,42px); font-weight:650; letter-spacing:-1.3px; line-height:1.3; margin:0 0 12px; }
.intro>p:last-child { color:var(--muted); font-size:14px; margin:0; }
.mobile-break { display:none; }
h2 { font-size:18px; font-weight:650; line-height:1.4; margin:0 0 8px; }
.card { background:var(--card); border:1px solid var(--line); border-radius:var(--radius); padding:24px; margin-bottom:16px; }
.setup-card { max-width:560px; margin-top:8px; padding:30px; }
.row { display:flex; gap:8px; align-items:center; }
.row input { flex:1; }
.row button { flex-shrink:0; }
.wide { width:100%; }
.hint { font-size:12px; line-height:1.7; color:var(--muted); margin:6px 0 12px; }
.field-error { font-size:13px; color:var(--error); margin:8px 0 0; }
.field-error:empty { display:none; }
.my-head { display:flex; gap:12px; justify-content:space-between; align-items:center; }
.my-head .eyebrow { margin-bottom:3px; }
.my-name { font-size:20px; font-weight:650; overflow-wrap:anywhere; }
.my-state { color:var(--muted); font-size:12px; }
.auth-row { display:flex; align-items:center; justify-content:space-between; gap:12px; border-top:1px solid var(--line); padding-top:14px; margin-top:16px; font-size:13px; }
.auth-row .row { flex-shrink:0; }
.visible-row { display:flex; gap:8px; align-items:center; font-size:12px; }
.workspace { display:grid; grid-template-columns:minmax(0,1.15fr) minmax(0,1fr); gap:16px; align-items:start; }
.workspace>.card { min-width:0; }
.section-head { display:flex; align-items:center; justify-content:space-between; gap:8px; }
.section-head h2 { margin:0; }
.section-head .hint { margin:0; }
.count { font-size:12px; font-weight:400; color:var(--muted); }
.peer-list { display:flex; flex-direction:column; gap:10px; margin-top:18px; }
.peer { display:flex; justify-content:space-between; gap:10px; align-items:center; padding:14px; background:var(--soft); border-radius:12px; }
.peer>div:first-child { min-width:0; flex:1; }
.peer .pname { font-size:14px; font-weight:650; overflow-wrap:anywhere; }
.peer .pmeta { font-size:11px; color:var(--muted); margin-top:3px; }
.peer-actions { display:flex; gap:6px; flex-wrap:wrap; justify-content:flex-end; }
.peer button { min-height:40px; padding:7px 12px; font-size:12px; }
.empty { font-size:13px; color:var(--muted); padding:24px 12px; text-align:center; border:1px dashed var(--line); border-radius:12px; margin:0; }
.pair-divider { display:flex; align-items:center; gap:10px; margin:20px 0 12px; color:var(--muted); font-size:11px; }
.pair-divider::before,.pair-divider::after { content:""; height:1px; flex:1; background:var(--line); }
.code-box { margin-top:14px; }
.code { font-family:ui-monospace,SFMono-Regular,monospace; font-size:clamp(23px,3vw,30px); font-weight:650; letter-spacing:.13em; background:var(--soft); padding:16px 12px; border-radius:10px; text-align:center; user-select:all; white-space:nowrap; }
#code-status { text-align:center; }
.notice { display:flex; align-items:center; justify-content:space-between; gap:10px; padding:10px 16px; margin:0 0 16px; border:1px solid var(--line); border-radius:12px; background:var(--soft); font-size:13px; }
.notice.error { color:var(--error); border-color:var(--error); }
.modal { position:fixed; inset:0; padding:24px; background:rgba(20,34,27,.48); backdrop-filter:blur(4px); display:flex; align-items:center; justify-content:center; z-index:50; overflow-y:auto; }
#invite-modal,#file-modal,#rename-modal,#confirm-modal { z-index:60; }
.modal-body { width:100%; max-width:440px; max-height:calc(100dvh - 48px); overflow:auto; padding:28px; background:var(--card); border:1px solid var(--line); border-radius:20px; box-shadow:0 16px 64px #10251d26; }
.modal-body p { overflow-wrap:anywhere; }
.modal-actions { margin-top:22px; justify-content:flex-end; flex-wrap:wrap; }
.t-file { font-size:15px; overflow-wrap:anywhere; }
.t-status { font-size:13px; color:var(--muted); min-height:24px; }
.t-path { color:var(--accent); font-size:11px; }
.progress { height:7px; background:var(--line); border-radius:5px; overflow:hidden; margin:22px 0 10px; }
.progress div { height:100%; width:0; background:var(--accent); transition:width .15s; }
.download-file { display:inline-block; text-decoration:none; font-size:14px; }
footer { padding-top:10px; padding-bottom:30px; text-align:center; color:var(--muted); font-size:11px; }
footer p { margin:8px 0 0; }
.status-dot { display:inline-block; width:6px; height:6px; background:var(--accent); border-radius:50%; margin-right:6px; }
.hidden { display:none!important; }
.sr-only { position:absolute; width:1px; height:1px; padding:0; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0; }
@media(max-width:680px) {
  .site-header,main,footer { padding-left:18px; padding-right:18px; }
  .site-header { padding-top:18px; }
  .intro { padding-top:28px; }
  .mobile-break { display:block; }
  .workspace { grid-template-columns:minmax(0,1fr); gap:0; }
  .card { padding:20px; }
  .auth-row { align-items:flex-start; flex-direction:column; }
  .peer { flex-wrap:wrap; }
  .peer-actions { margin-left:auto; }
  .modal { padding:16px; }
  .modal-body { padding:24px; max-height:calc(100dvh - 32px); }
  .modal-actions button { padding:10px 14px; }
  input { font-size:16px; }
  .code { font-size:27px; }
}
@media(prefers-color-scheme:dark) {
  :root { --bg:#171e1a; --card:#202922; --ink:#e1e7dd; --muted:#abb5a7; --line:#3b473b; --accent:#3a7258; --soft:#2a362c; --error:#f6a79a; }
  button.text-button,.t-path { color:#b5d7bc; }
  button.danger { color:#351710; }
  .brand-dot,.status-dot { background:#9cbe94; }
}
@media(prefers-reduced-motion:reduce) { *,*::before,*::after { transition:none!important; scroll-behavior:auto!important; } }