:root {
  --bg: #f4f6f8;
  --card: #ffffff;
  --text: #1c2530;
  --muted: #6b7684;
  --border: #dde3ea;
  --accent: #2563eb;
  --accent-hover: #1d4fd8;
  --danger: #d64545;
  --ok: #178a4c;
  --warn: #b45309;
  --code-bg: #fff7e0;
  --code-border: #f0c04a;
  --radius: 10px;
  font-size: 15px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

.hidden { display: none !important; }
.muted { color: var(--muted); font-size: 0.9em; }

/* 顶部错误条（网络失败 / 5xx 统一展示） */
.error-banner {
  position: sticky;
  top: 0;
  z-index: 30;
  background: var(--danger);
  color: #fff;
  padding: 8px 16px;
  text-align: center;
}

/* 登录 */
.login-wrap {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 16px;
}
.login-card { width: 340px; }
.login-card h1 { margin: 0 0 4px; font-size: 1.5em; text-align: center; }

/* 卡片 */
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px 20px;
  margin: 0 auto 16px;
  max-width: 760px;
}
.card h2 { margin: 0 0 12px; font-size: 1.1em; }
.card hr { border: none; border-top: 1px solid var(--border); margin: 16px 0; }

/* 顶栏 */
.topbar {
  max-width: 760px;
  margin: 0 auto 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.topbar h1 { font-size: 1.25em; margin: 0; }
.topbar-right { display: flex; align-items: center; gap: 10px; }

/* 设备状态 pill */
.pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 12px;
  border-radius: 999px;
  font-size: 0.85em;
  border: 1px solid var(--border);
  background: #eceff3;
  color: var(--muted);
}
.pill::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: currentColor;
}
.pill-online { background: #e3f5ea; border-color: #b6e2c6; color: var(--ok); }
.pill-offline { background: #fdeaea; border-color: #f3c1c1; color: var(--danger); font-weight: 600; }

/* 设备离线横幅 */
.offline-banner {
  max-width: 760px;
  margin: 0 auto 16px;
  padding: 10px 16px;
  border-radius: var(--radius);
  background: #fdeaea;
  border: 1px solid #f3c1c1;
  color: var(--danger);
}

/* 表单 */
label { display: block; margin-bottom: 10px; font-size: 0.92em; color: var(--muted); }
label.inline { display: inline-flex; align-items: center; gap: 6px; margin: 0; }
label.checkbox { display: inline-flex; align-items: center; gap: 6px; margin: 0; }

input, select, textarea {
  font: inherit;
  color: var(--text);
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 7px 10px;
  width: 100%;
}
label.inline input, label.checkbox input { width: auto; }
textarea { resize: vertical; }
input:focus, select:focus, textarea:focus {
  outline: 2px solid color-mix(in srgb, var(--accent) 35%, transparent);
  outline-offset: 1px;
  border-color: var(--accent);
}

button {
  font: inherit;
  padding: 7px 16px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  cursor: pointer;
}
button:hover { background: #f1f4f8; }
button:disabled { opacity: 0.5; cursor: not-allowed; }
button.primary { background: var(--accent); border-color: var(--accent); color: #fff; }
button.primary:hover:not(:disabled) { background: var(--accent-hover); }
button.danger { background: var(--danger); border-color: var(--danger); color: #fff; }
button.danger:hover:not(:disabled) { background: #bb3a3a; }

.form-row { display: flex; gap: 12px; flex-wrap: wrap; align-items: flex-end; }
.form-row > label { flex: 1 1 160px; }
.form-row > label.grow { flex: 3 1 260px; }
.form-actions { margin-top: 4px; }

/* 发送结果 */
.send-status {
  margin-top: 10px;
  padding: 8px 12px;
  border-radius: 8px;
  background: #eef3fb;
  border: 1px solid #c9d9f2;
  font-size: 0.92em;
  word-break: break-all;
}
.send-status.ok { background: #e3f5ea; border-color: #b6e2c6; }
.send-status.err { background: #fdeaea; border-color: #f3c1c1; color: var(--danger); }

.field-error, .result { margin: 8px 0 0; font-size: 0.9em; }
.field-error, .result.err { color: var(--danger); }
.result.ok { color: var(--ok); }

/* 筛选 */
.filters {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 12px;
}
.filters select, .filters input { width: auto; }
.filters button { flex: none; }

/* 消息列表 */
.message-list { display: flex; flex-direction: column; gap: 10px; }
.msg {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 14px;
}
.msg-empty { color: var(--muted); text-align: center; padding: 24px 0; }

.msg-head {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
  font-size: 0.88em;
}
.msg-peer { font-weight: 600; font-size: 1em; }
.msg-time { color: var(--muted); margin-left: auto; }

.badge {
  padding: 1px 8px;
  border-radius: 999px;
  font-size: 0.82em;
  border: 1px solid var(--border);
}
.badge-in { background: #e8f0fe; border-color: #c3d7f7; color: #1d4fd8; }
.badge-out { background: #f0e9fd; border-color: #d8c8f5; color: #6d28d9; }
.badge-pending { background: #fef3d8; border-color: #f0d9a0; color: var(--warn); }
.badge-sent, .badge-received { background: #e3f5ea; border-color: #b6e2c6; color: var(--ok); }
.badge-failed, .badge-expired { background: #fdeaea; border-color: #f3c1c1; color: var(--danger); }

.msg-body { margin: 8px 0 0; white-space: pre-wrap; word-break: break-word; }
.msg-body.placeholder { color: var(--muted); font-style: italic; }
.msg-error { margin-top: 6px; color: var(--danger); font-size: 0.9em; word-break: break-all; }

/* 验证码：高亮 + 一键复制 */
.msg-code {
  margin-top: 8px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--code-bg);
  border: 1px solid var(--code-border);
  border-radius: 8px;
  padding: 4px 10px;
}
.msg-code code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 1.05em;
  letter-spacing: 1px;
  font-weight: 600;
}
.msg-code button { padding: 2px 10px; font-size: 0.85em; }

/* 分页 */
.pager {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 12px;
}
#page-info { min-width: 64px; text-align: center; }
#refresh-btn { margin-left: auto; }

/* toast */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  background: #2b3442;
  color: #fff;
  padding: 8px 18px;
  border-radius: 999px;
  font-size: 0.9em;
  z-index: 40;
}

@media (max-width: 560px) {
  .card { padding: 12px 14px; margin: 0 8px 12px; }
  .topbar { margin: 0 8px 12px; }
  .msg-time { width: 100%; margin-left: 0; }
}