/* 管理后台样式 */
:root {
  --primary: #0F4C81;
  --primary-dark: #0A3559;
  --accent: #F59E0B;
  --text: #1F2937;
  --muted: #6B7280;
  --bg: #F1F5F9;
  --card: #FFFFFF;
  --border: #E2E8F0;
  --danger: #DC2626;
  --ok: #059669;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: "Segoe UI", "PingFang SC", "Microsoft YaHei", Arial, sans-serif; background: var(--bg); color: var(--text); font-size: 14px; }
a { color: var(--primary); text-decoration: none; }

.layout { display: flex; min-height: 100vh; }
.sidebar { width: 220px; background: var(--primary-dark); color: #CBD5E1; flex-shrink: 0; position: sticky; top: 0; height: 100vh; overflow-y: auto; }
.sidebar .brand { padding: 20px; font-size: 18px; font-weight: 700; color: #fff; border-bottom: 1px solid rgba(255,255,255,.1); display: flex; align-items: center; gap: 8px; }
.sidebar .brand img { width: 28px; height: 28px; }
.sidebar nav a { display: flex; align-items: center; gap: 10px; padding: 12px 20px; color: #CBD5E1; font-size: 14px; }
.sidebar nav a:hover { background: rgba(255,255,255,.06); color: #fff; }
.sidebar nav a.active { background: var(--primary); color: #fff; border-inline-start: 3px solid var(--accent); }
.sidebar nav a .badge { margin-inline-start: auto; background: var(--danger); color: #fff; font-size: 11px; border-radius: 999px; padding: 1px 7px; }
.sidebar .logout { margin-top: 20px; border-top: 1px solid rgba(255,255,255,.1); }

.main { flex: 1; padding: 24px; min-width: 0; }
.page-title { font-size: 20px; font-weight: 700; color: var(--primary-dark); margin-bottom: 18px; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; }

.card { background: var(--card); border-radius: 10px; box-shadow: 0 1px 4px rgba(0,0,0,.06); padding: 20px; margin-bottom: 20px; }
.card h3 { font-size: 15px; color: var(--primary-dark); margin-bottom: 14px; }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(140px, 1fr)); gap: 14px; margin-bottom: 20px; }
.stat-box { background: #fff; border-radius: 10px; padding: 16px; box-shadow: 0 1px 4px rgba(0,0,0,.06); }
.stat-box .num { font-size: 26px; font-weight: 800; color: var(--primary); }
.stat-box .label { color: var(--muted); font-size: 12px; margin-top: 2px; }
.stat-box.warn .num { color: var(--accent); }

table.list { width: 100%; border-collapse: collapse; background: #fff; }
table.list th, table.list td { padding: 10px 12px; border-bottom: 1px solid var(--border); text-align: start; font-size: 13px; vertical-align: top; }
table.list th { background: #F8FAFC; color: var(--primary-dark); white-space: nowrap; }
table.list tr:hover td { background: #F8FAFC; }
table.list img.thumb { width: 64px; height: 48px; object-fit: cover; border-radius: 6px; }

.btn { display: inline-block; padding: 8px 16px; border-radius: 6px; border: none; background: var(--primary); color: #fff; font-size: 13px; cursor: pointer; }
.btn:hover { background: var(--primary-dark); }
.btn-sm { padding: 4px 10px; font-size: 12px; }
.btn-danger { background: var(--danger); }
.btn-danger:hover { background: #B91C1C; }
.btn-muted { background: #64748B; }
.btn-accent { background: var(--accent); color: #1F2937; }

.tag { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: 12px; }
.tag-new { background: #FEF3C7; color: #92400E; }
.tag-following { background: #DBEAFE; color: #1D4ED8; }
.tag-done { background: #D1FAE5; color: #065F46; }
.tag-on { background: #D1FAE5; color: #065F46; }
.tag-off { background: #E2E8F0; color: #64748B; }

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-row { margin-bottom: 14px; }
.form-row label { display: block; font-weight: 600; margin-bottom: 5px; color: var(--primary-dark); font-size: 13px; }
.form-row input, .form-row textarea, .form-row select { width: 100%; padding: 9px 12px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px; font-family: inherit; }
.form-row input:focus, .form-row textarea:focus { outline: 2px solid rgba(15,76,129,.2); border-color: var(--primary); }
.form-hint { font-size: 12px; color: var(--muted); margin-top: 4px; }

.alert { padding: 12px 16px; border-radius: 8px; margin-bottom: 16px; font-size: 13px; }
.alert-err { background: #FEF2F2; color: #B91C1C; border: 1px solid #FECACA; }
.alert-ok { background: #ECFDF5; color: #047857; border: 1px solid #A7F3D0; }

.img-edit { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 10px; }
.img-edit .item { position: relative; }
.img-edit img { width: 110px; height: 82px; object-fit: cover; border-radius: 6px; border: 1px solid var(--border); }
.img-edit label { position: absolute; top: 4px; inset-inline-end: 4px; background: rgba(220,38,38,.9); color: #fff; font-size: 11px; border-radius: 4px; padding: 2px 6px; cursor: pointer; }
.img-edit input[type=checkbox] { display: none; }
.img-edit .item:has(input:checked) img { opacity: .35; }

.filter-bar { display: flex; gap: 8px; margin-bottom: 16px; flex-wrap: wrap; }
.filter-bar a { padding: 6px 14px; border-radius: 999px; border: 1px solid var(--border); background: #fff; color: var(--text); font-size: 13px; }
.filter-bar a.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* 简单柱状图 */
.bars { display: flex; align-items: flex-end; gap: 4px; height: 120px; padding-top: 10px; }
.bars .bar { flex: 1; background: var(--primary); border-radius: 3px 3px 0 0; min-height: 2px; position: relative; }
.bars .bar:hover { background: var(--accent); }
.bars .bar span { position: absolute; bottom: 100%; inset-inline-start: 50%; transform: translateX(-50%); font-size: 10px; color: var(--muted); white-space: nowrap; }
.bars-labels { display: flex; gap: 4px; font-size: 10px; color: var(--muted); margin-top: 4px; }
.bars-labels span { flex: 1; text-align: center; overflow: hidden; }

/* 登录页 */
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, var(--primary-dark), var(--primary)); }
.login-box { background: #fff; border-radius: 12px; padding: 36px; width: 360px; max-width: 92vw; box-shadow: 0 20px 60px rgba(0,0,0,.25); }
.login-box h1 { font-size: 20px; color: var(--primary-dark); text-align: center; margin-bottom: 24px; display: flex; align-items: center; justify-content: center; gap: 10px; }
.login-box h1 img { width: 34px; height: 34px; }

/* 聊天工作台 */
.chat-work { display: grid; grid-template-columns: 300px 1fr; gap: 16px; height: calc(100vh - 110px); }
.chat-sessions { background: #fff; border-radius: 10px; overflow-y: auto; box-shadow: 0 1px 4px rgba(0,0,0,.06); }
.chat-sessions .sess { padding: 12px 14px; border-bottom: 1px solid var(--border); cursor: pointer; }
.chat-sessions .sess:hover { background: #F8FAFC; }
.chat-sessions .sess.active { background: #EFF6FF; border-inline-start: 3px solid var(--primary); }
.chat-sessions .sess .name { font-weight: 600; font-size: 13px; display: flex; justify-content: space-between; gap: 6px; }
.chat-sessions .sess .preview { font-size: 12px; color: var(--muted); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; margin-top: 3px; }
.chat-sessions .sess .unread { background: var(--danger); color: #fff; font-size: 11px; border-radius: 999px; padding: 0 7px; }
.chat-room { background: #fff; border-radius: 10px; box-shadow: 0 1px 4px rgba(0,0,0,.06); display: flex; flex-direction: column; overflow: hidden; }
.chat-room .room-head { padding: 12px 16px; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; gap: 8px; flex-wrap: wrap; }
.chat-room .room-head b { font-size: 14px; }
.chat-room .room-msgs { flex: 1; overflow-y: auto; padding: 16px; background: #F8FAFC; }
.room-msg { max-width: 75%; margin-bottom: 10px; padding: 9px 13px; border-radius: 10px; font-size: 13px; white-space: pre-line; word-break: break-word; }
.room-msg.visitor { background: #fff; border: 1px solid var(--border); margin-inline-end: auto; }
.room-msg.admin { background: var(--primary); color: #fff; margin-inline-start: auto; }
.room-msg .tr { display: block; margin-top: 5px; padding-top: 5px; border-top: 1px dashed rgba(0,0,0,.15); font-size: 12px; opacity: .75; }
.room-msg.admin .tr { border-top-color: rgba(255,255,255,.35); }
.room-msg .meta { display: block; font-size: 10px; opacity: .6; margin-top: 4px; }
.chat-room .room-input { display: flex; border-top: 1px solid var(--border); }
.chat-room .room-input input { flex: 1; border: none; padding: 13px 14px; font-size: 14px; outline: none; }
.chat-room .room-input button { border: none; background: var(--primary); color: #fff; padding: 0 22px; cursor: pointer; }
.chat-empty { display: flex; align-items: center; justify-content: center; height: 100%; color: var(--muted); }

@media (max-width: 900px) {
  .layout { flex-direction: column; }
  .sidebar { width: 100%; height: auto; position: static; }
  .sidebar nav { display: flex; overflow-x: auto; }
  .sidebar nav a { white-space: nowrap; }
  .main { padding: 14px; }
  .form-grid { grid-template-columns: 1fr; }
  .chat-work { grid-template-columns: 1fr; height: auto; }
  .chat-sessions { max-height: 240px; }
  .chat-room { height: 60vh; }
  table.list { display: block; overflow-x: auto; }
}