/* ===== michat 全局样式：移动端 + 桌面端自适应 ===== */
:root {
  --primary: #4c6ef5;
  --primary-dark: #3b5bdb;
  --bg: #f4f6fb;
  --card: #ffffff;
  --text: #1f2733;
  --text-2: #6b7686;
  --border: #e6e9f0;
  --ok: #12b76a;
  --danger: #e03131;
  --radius: 12px;
  --shadow: 0 6px 24px rgba(20, 30, 60, 0.08);
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", Roboto, Helvetica, Arial, sans-serif;
  font-size: 15px;
  line-height: 1.5;
  -webkit-text-size-adjust: 100%;
}

a { color: var(--primary); text-decoration: none; }

/* ---------- 顶部导航 ---------- */
.navbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 20px;
  background: #fff;
  border-bottom: 1px solid var(--border);
}
.navbar .brand {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .5px;
  color: var(--primary);
}
.navbar .brand-logo {
  display: block;
  height: 40px;
  width: auto;
  border-radius: 8px;
  flex: none;
}
.navbar .brand small { color: var(--text-2); font-weight: 400; font-size: 12px; margin-left: 6px; }
.navbar .nav-actions { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

/* ---------- 布局 ---------- */
.container {
  max-width: 1040px;
  margin: 0 auto;
  padding: 20px;
}
.grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: start;
}

/* ---------- 卡片 ---------- */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 20px;
}
.card h2 { margin: 0 0 16px; font-size: 17px; }
.card h2 .hint { font-size: 12px; color: var(--text-2); font-weight: 400; margin-left: 6px; }

/* ---------- 表单 ---------- */
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13px; color: var(--text-2); margin-bottom: 6px; }
input[type="text"], input[type="email"], input[type="password"], input[type="number"], textarea, select {
  width: 100%;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 15px;
  background: #fbfcfe;
  color: var(--text);
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
input:focus, textarea:focus, select:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(76, 110, 245, .12);
  background: #fff;
}
.checkbox { display: flex; align-items: center; gap: 8px; font-size: 14px; }
.checkbox input { width: 18px; height: 18px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  background: var(--primary);
  color: #fff;
  transition: background .15s, opacity .15s;
}
.btn:hover { background: var(--primary-dark); }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn.ghost { background: #fff; color: var(--primary); border-color: var(--primary); }
.btn.ghost:hover { background: #eef2ff; }
.btn.gray { background: #eef0f4; color: var(--text); }
.btn.gray:hover { background: #e3e6ec; }
.btn.danger { background: #fff; color: var(--danger); border-color: #ffd7d7; }
.btn.danger:hover { background: #fff0f0; }
.btn.sm { padding: 6px 10px; font-size: 13px; }
.btn.block { width: 100%; }

/* ---------- 提示 ---------- */
.tip { font-size: 13px; padding: 10px 12px; border-radius: 8px; margin-bottom: 12px; }
.tip.err { background: #fff0f0; color: var(--danger); border: 1px solid #ffd7d7; }
.tip.ok { background: #eefaf3; color: var(--ok); border: 1px solid #c6f0d8; }
.muted { color: var(--text-2); font-size: 13px; }

/* ---------- 房间列表 ---------- */
.room-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  margin-bottom: 10px;
  background: #fbfcfe;
}
.room-item .meta { min-width: 0; }
.room-item .title { font-weight: 600; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.room-item .sub { font-size: 12px; color: var(--text-2); }
.badge {
  display: inline-block;
  font-size: 11px;
  padding: 1px 8px;
  border-radius: 999px;
  background: #eef2ff;
  color: var(--primary);
  margin-left: 6px;
}
.badge.open { background: #eefaf3; color: var(--ok); }
.badge.closed { background: #f1f2f4; color: var(--text-2); }

/* ---------- 聊天页 ---------- */
.chat-wrap {
  display: grid;
  grid-template-columns: 1fr 260px;
  gap: 16px;
  height: calc(100vh - 64px);
  max-width: 1040px;
  margin: 0 auto;
  padding: 16px;
}
.chat-main {
  display: flex;
  flex-direction: column;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  min-height: 0;
}
.chat-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}
.chat-head .title { font-weight: 700; }
.chat-head .sub { font-size: 12px; color: var(--text-2); }

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  background: #f7f8fc;
  display: flex;
  flex-direction: column;
  gap: 12px;
  min-height: 0;
}
.load-more { text-align: center; }
.load-more .btn { margin: 0 auto; }
.msg { display: flex; flex-direction: column; max-width: 78%; }
.msg .who { font-size: 12px; color: var(--text-2); margin-bottom: 3px; }
.msg .bubble {
  padding: 9px 13px;
  border-radius: 12px;
  background: #fff;
  border: 1px solid var(--border);
  word-break: break-word;
  white-space: pre-wrap;
}
.msg .bubble img { max-width: 220px; border-radius: 8px; display: block; }
.msg .bubble video { max-width: 260px; max-height: 320px; border-radius: 8px; display: block; background: #000; }
.msg .time { font-size: 11px; color: #aab2c0; margin-top: 3px; }
.msg-del {
  border: 0;
  background: transparent;
  color: #aab2c0;
  font-size: 11px;
  padding: 0 0 0 6px;
  cursor: pointer;
  text-decoration: underline;
}
.msg-del:hover { color: var(--danger); }
.msg.me { align-self: flex-end; align-items: flex-end; }
.msg.me .bubble { background: var(--primary); color: #fff; border-color: var(--primary); }
.msg.me .who { color: var(--primary); }

.chat-input {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 10px 12px;
  border-top: 1px solid var(--border);
  background: #fff;
}
.chat-input input[type="text"] { flex: 1; }
.icon-btn {
  border: 1px solid var(--border);
  background: #fff;
  border-radius: 8px;
  width: 40px;
  height: 40px;
  font-size: 18px;
  cursor: pointer;
  flex: none;
}
.icon-btn:hover { background: #f1f3f8; }

/* 成员面板隐藏时，聊天主区占满整宽 */
.chat-wrap.no-members { grid-template-columns: 1fr; }

.members-panel {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: none;
  flex-direction: column;
  min-height: 0;
}
.members-panel.show { display: flex; }
.members-panel .head { padding: 12px 16px; border-bottom: 1px solid var(--border); font-weight: 700; font-size: 14px; }
.members-panel ul { list-style: none; margin: 0; padding: 8px; overflow-y: auto; }
.members-panel li { display: flex; align-items: center; gap: 8px; padding: 8px; border-radius: 8px; font-size: 14px; }
.members-panel li:hover { background: #f7f8fc; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: #cbd2dd; flex: none; }
.dot.online { background: var(--ok); }

/* 加入遮罩 */
.join-mask {
  position: fixed;
  inset: 0;
  background: rgba(20, 28, 45, .5);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  z-index: 50;
}
.join-mask .card { width: 100%; max-width: 380px; }

/* ---------- 响应式：手机端 ---------- */
@media (max-width: 780px) {
  .grid { grid-template-columns: 1fr; }
  .container { padding: 14px; }
  .navbar { padding: 10px 14px; }
  .navbar .brand-logo { height: 36px; }
  .navbar .brand small { display: none; }

  .chat-wrap {
    grid-template-columns: 1fr;
    height: calc(100vh - 56px);
    padding: 0;
    gap: 0;
  }
  .chat-main { border-radius: 0; border-left: none; border-right: none; }
  .members-panel {
    display: none;
    position: fixed;
    inset: 56px 0 0 0;
    border-radius: 0;
    z-index: 30;
  }
  .members-panel.show { display: flex; }
  .msg { max-width: 88%; }
}