* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; width: 100%; background: #fff; }
body {
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
  font-family: -apple-system, "Segoe UI", "Microsoft YaHei", sans-serif;
}

.chat-page { min-height: 100vh; background: #fff; }
.chat-page .list { max-width: 640px; margin: 0 auto; padding-top: 10px; }
.chat-page .msg { padding: 16px 70px 0; }
.chat-page .msg-row { display: flex; gap: 10px; align-items: flex-start; }
.chat-page .avatar {
  width: 34px; height: 34px; border-radius: 4px; object-fit: cover;
  flex-shrink: 0; background: #eee;
}
.chat-page .avatar-placeholder { width: 34px; flex-shrink: 0; }
.chat-page .msg-main {
  flex: 1; min-width: 0; border-bottom: 1px solid #ececec; padding: 0 0 20px;
}
.chat-page .msg-head {
  display: flex; justify-content: space-between; align-items: baseline; line-height: 1.2;
}
.chat-page .msg-name { font-size: 13px; color: #888; }
.chat-page .msg-time { font-size: 12px; color: #b2b2b2; }
.chat-page .msg-content {
  margin-top: 8px; font-size: 15px; color: #333; line-height: 1.5; word-break: break-word;
}
.chat-page .msg-image {
  display: block; margin-top: 8px; max-width: 190px; max-height: 240px;
  border-radius: 4px; cursor: pointer; background: #f2f2f2;
}

.chat-page .msg:last-child { position: relative; padding-bottom: 20px; }
.chat-page .msg:last-child .msg-main { border-bottom: none; padding-bottom: 0; }
.chat-page .msg:last-child:after {
  content: ""; position: absolute; left: 50%; bottom: 0; width: 100%;
  transform: translate(-50%); border-top: 1px solid #ececec;
}
.chat-page .empty {
  padding: 80px 20px; text-align: center; color: #b2b2b2; font-size: 14px;
}

@media (max-width: 640px) {
  .chat-page .msg { padding: 16px 16px 0; }
  .chat-page .msg-content { font-size: 16px; }
  .chat-page .msg-name { font-size: 14px; }
  .chat-page .msg:last-child:after { width: 100vw; }
}

:root {
  --ink: #16181d;
  --ink2: #6b7280;
  --ink3: #a3a8b3;
  --line: #ededf0;
  --line2: #e2e4e9;
  --hover: #f7f8fa;
  --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.admin-page {
  min-height: 100vh; background: #fff; color: var(--ink);
  font-size: 14px; line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.admin-shell { max-width: 760px; margin: 0 auto; padding: 0 24px 100px; }

.admin-top {
  display: flex; align-items: center; justify-content: space-between;
  height: 64px; border-bottom: 1px solid var(--line);
}
.admin-brand { display: flex; align-items: center; gap: 9px; font-size: 13.5px; }
.admin-brand .mark { width: 7px; height: 7px; border-radius: 50%; background: var(--ink); }
.admin-brand em { font-style: normal; color: var(--ink3); }
.top-nav { display: flex; align-items: center; gap: 18px; }
.top-nav a, .top-nav button {
  background: none; border: 0; padding: 0; color: var(--ink2); font-size: 13px;
  font-family: inherit; text-decoration: none; cursor: pointer; transition: color .15s;
}
.top-nav a:hover, .top-nav button:hover { color: var(--ink); }

.admin-intro { padding: 44px 0 0; }
.admin-intro h1 { margin: 0; font-size: 21px; font-weight: 600; letter-spacing: -.01em; }
.admin-intro .lead { margin: 8px 0 0; font-size: 12.5px; color: var(--ink2); }

.admin-page .msg-rows { list-style: none; margin: 0; padding: 0; }
.admin-page .msg-row {
  display: grid; grid-template-columns: 34px 1fr auto; gap: 16px; align-items: start;
  padding: 22px 0; border-bottom: 1px solid var(--line);
}
.admin-page .msg-row:first-child { border-top: 1px solid var(--line); margin-top: 24px; }
.admin-page .msg-no {
  font-family: var(--mono); font-size: 11px; color: var(--ink3);
  letter-spacing: .06em; padding-top: 8px;
}
.admin-page .msg-field { min-width: 0; }

.admin-page .num-boxes { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; padding-top: 2px; }
.admin-page .num-box {
  width: 100%; max-width: 170px; border: 1px solid var(--line2); border-radius: 6px;
  background: #fff; padding: 7px 10px; text-align: center;
  font-family: var(--mono); font-size: 15px; letter-spacing: .06em; color: var(--ink);
  outline: none; transition: border-color .15s, box-shadow .15s;
}
.admin-page .num-box.two { width: 50px; max-width: none; padding: 7px 0; }
.admin-page .num-box.pair { width: 92px; max-width: none; padding: 7px 0; }

.admin-page .num-each { font-size: 13px; color: var(--ink2); padding: 0 2px; }
.admin-page .num-box:focus { border-color: var(--ink); box-shadow: 0 0 0 3px rgba(0, 0, 0, .05); }
.admin-page .msg-locked { margin: 0; font-size: 13px; color: var(--ink3); padding-top: 8px; }
.admin-page .msg-err { display: none; margin: 8px 0 0; font-size: 12px; color: #d0453b; }
.admin-page .msg-row.invalid .msg-err { display: block; }
.admin-page .msg-row.invalid .num-box { border-color: #d0453b; }

.admin-page .msg-save {
  align-self: center; background: none; border: 1px solid var(--line2); color: var(--ink2);
  font-size: 12.5px; padding: 5px 11px; border-radius: 6px; font-family: inherit;
  opacity: 0; transition: opacity .15s, color .15s, border-color .15s;
}
.admin-page .msg-row:hover .msg-save,
.admin-page .msg-row.dirty .msg-save,
.admin-page .msg-save:focus { opacity: 1; }
.admin-page .msg-row.dirty .msg-save { color: var(--ink); border-color: var(--ink); background: #fff; }
.admin-page .msg-save:hover { border-color: var(--ink); color: var(--ink); }

.admin-bar {
  position: fixed; left: 0; right: 0; bottom: 0; z-index: 20;
  max-width: 760px; margin: 0 auto; padding: 14px 24px 18px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  background: linear-gradient(to top, #fff 62%, rgba(255, 255, 255, 0));
}
.admin-state { display: flex; align-items: center; gap: 8px; font-size: 12.5px; color: var(--ink3); }
.admin-state .dot {
  width: 5px; height: 5px; border-radius: 50%; background: #c8ccd4; transition: background .2s;
}
.admin-state.dirty { color: var(--ink2); }
.admin-state.dirty .dot { background: #e0a34a; }

button.primary {
  background: var(--ink); color: #fff; border: 0; font-size: 13.5px;
  padding: 9px 20px; border-radius: 7px; font-family: inherit;
  letter-spacing: .01em; transition: opacity .15s;
}
button.primary:hover { opacity: .86; }

.admin-page.login-mode { display: flex; align-items: center; justify-content: center; padding: 24px; }
.login-card { width: 100%; max-width: 330px; }
.login-card h2 { margin: 0; font-size: 18px; font-weight: 600; letter-spacing: -.01em; }
.login-card .lead { margin: 6px 0 0; font-size: 13px; color: var(--ink3); }
.field { margin-top: 22px; }
.field label { display: block; font-size: 12px; color: var(--ink2); margin-bottom: 7px; }
.field input {
  width: 100%; border: 1px solid var(--line2); border-radius: 6px;
  padding: 9px 11px; font-size: 14px; font-family: inherit; outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.field input:focus { border-color: var(--ink); box-shadow: 0 0 0 3px rgba(0, 0, 0, .04); }
.login-card button.primary { width: 100%; margin-top: 26px; padding: 10px; border-radius: 7px; }
.login-card .error { margin: 12px 0 0; font-size: 12.5px; color: #d0453b; display: none; }

.admin-toast {
  position: fixed; top: 22px; left: 50%; transform: translate(-50%, -14px); z-index: 100;
  background: var(--ink); color: #fff; font-size: 12.5px; padding: 7px 14px;
  border-radius: 7px; opacity: 0; pointer-events: none;
  transition: opacity .2s, transform .2s; max-width: 80vw;
}
.admin-toast.on { opacity: 1; transform: translate(-50%, 0); }
.admin-toast.err { background: #c2413a; }

@media (max-width: 640px) {
  .admin-shell { padding: 0 16px 104px; }
  .admin-top { height: 56px; }
  .admin-intro { padding-top: 30px; }
  .admin-page .msg-row { grid-template-columns: 24px 1fr; gap: 10px; padding: 18px 0; }
  .admin-page .msg-no { font-size: 10px; }
  .admin-page .num-box { max-width: 100%; font-size: 16px; }
  .admin-page .num-box.two { width: 46px; }
  .admin-page .num-box.pair { width: 80px; }
  .admin-page .msg-save { grid-column: 2; justify-self: start; margin-top: 10px; opacity: 1; font-size: 12px; }
  .admin-bar { padding: 12px 16px 16px; }
}