:root {
  --bg: #f5f7fb;
  --panel: #ffffff;
  --border: #e5e8ef;
  --text: #1f2430;
  --muted: #6b7280;
  --primary: #2f6fed;
  --primary-dark: #2158c9;
  --danger: #e5484d;
  --success: #2f9e63;
  --warn: #d98324;
  --radius: 10px;
  --shadow: 0 1px 2px rgba(16, 24, 40, 0.04), 0 8px 24px rgba(16, 24, 40, 0.06);
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  font-size: 14px;
  -webkit-font-smoothing: antialiased;
}

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

.layout { display: flex; min-height: 100vh; }

.sidebar {
  width: 208px;
  background: #0f172a;
  color: #cbd5e1;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
}
.sidebar .brand {
  padding: 20px 18px 14px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.3px;
}
.sidebar .brand small { display: block; font-weight: 400; color: #7c8aa5; font-size: 11px; margin-top: 4px; }
.sidebar nav { padding: 8px; display: flex; flex-direction: column; gap: 2px; }
.sidebar nav a {
  color: #c3cddf;
  padding: 9px 12px;
  border-radius: 8px;
  font-size: 13px;
}
.sidebar nav a:hover { background: rgba(255, 255, 255, 0.06); color: #fff; }
.sidebar nav a.active { background: var(--primary); color: #fff; }
.sidebar .foot { margin-top: auto; padding: 14px 18px; font-size: 11px; color: #64748b; }

.main { flex: 1; min-width: 0; display: flex; flex-direction: column; }
.topbar {
  height: 56px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
}
.topbar h1 { font-size: 15px; margin: 0; font-weight: 600; }
.topbar .user { font-size: 13px; color: var(--muted); display: flex; align-items: center; gap: 12px; }

.content { padding: 20px; display: flex; flex-direction: column; gap: 16px; }

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px;
}
.card h2 { font-size: 14px; margin: 0 0 12px; font-weight: 600; }

.stat-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 14px; }
.stat { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; box-shadow: var(--shadow); }
.stat .label { color: var(--muted); font-size: 12px; }
.stat .value { font-size: 26px; font-weight: 600; margin-top: 6px; }
.stat .value.small { font-size: 18px; }

.toolbar { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; margin-bottom: 12px; }
.toolbar .grow { flex: 1; }

input, select, textarea {
  font-family: inherit;
  font-size: 13px;
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  outline: none;
}
input:focus, select:focus, textarea:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(47, 111, 237, 0.12); }
input[type="checkbox"] { width: 15px; height: 15px; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--text);
  cursor: pointer;
  font-size: 13px;
  line-height: 1.4;
}
.btn:hover { border-color: #cfd6e4; }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-dark); }
.btn.danger { color: var(--danger); border-color: #f3c9ca; }
.btn.danger:hover { background: #fdf2f2; }
.btn.sm { padding: 4px 9px; font-size: 12px; }
.btn:disabled { opacity: 0.55; cursor: not-allowed; }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 9px 10px; border-bottom: 1px solid var(--border); font-size: 13px; vertical-align: middle; }
th { color: var(--muted); font-weight: 500; background: #fafbfe; white-space: nowrap; }
tbody tr:hover { background: #fafbff; }
.table-wrap { overflow-x: auto; }
td.actions { white-space: nowrap; display: flex; gap: 6px; flex-wrap: wrap; }

.badge { display: inline-block; padding: 1px 8px; border-radius: 999px; font-size: 12px; line-height: 1.7; }
.badge.online { background: #e8f7ee; color: var(--success); }
.badge.offline { background: #f1f2f5; color: var(--muted); }
.badge.success { background: #e8f7ee; color: var(--success); }
.badge.failed, .badge.timeout { background: #fdecec; color: var(--danger); }
.badge.pending, .badge.sent { background: #fff5e6; color: var(--warn); }
.badge.info { background: #eef3fd; color: var(--primary); }

.pager { display: flex; align-items: center; gap: 8px; justify-content: flex-end; margin-top: 12px; color: var(--muted); font-size: 12px; }

.thumb { width: 46px; height: 46px; border-radius: 6px; object-fit: cover; background: #f1f2f5; cursor: pointer; border: 1px solid var(--border); }

.empty { text-align: center; color: var(--muted); padding: 28px 0; font-size: 13px; }

/* login */
.login-wrap { min-height: 100vh; display: flex; align-items: center; justify-content: center; background: linear-gradient(135deg, #eef3fd, #f7f9fc 60%, #eef7f2); }
.login-card { width: 360px; background: #fff; border-radius: 14px; padding: 28px 26px; box-shadow: 0 20px 50px rgba(16, 24, 40, 0.12); }
.login-card h1 { font-size: 18px; margin: 0 0 6px; }
.login-card p.sub { color: var(--muted); font-size: 12px; margin: 0 0 20px; }
.login-card .field { display: flex; flex-direction: column; gap: 6px; margin-bottom: 14px; }
.login-card label { font-size: 12px; color: var(--muted); }
.login-card input { padding: 10px 12px; }
.login-card .btn { width: 100%; justify-content: center; padding: 10px; }
.login-error { color: var(--danger); font-size: 12px; min-height: 18px; }

/* modal */
.modal-mask { position: fixed; inset: 0; background: rgba(15, 23, 42, 0.45); display: none; align-items: center; justify-content: center; z-index: 50; padding: 20px; }
.modal-mask.open { display: flex; }
.modal { background: #fff; border-radius: 12px; width: 560px; max-width: 100%; max-height: 88vh; overflow: auto; box-shadow: 0 24px 60px rgba(15, 23, 42, 0.25); }
.modal header { padding: 16px 18px; border-bottom: 1px solid var(--border); display: flex; justify-content: space-between; align-items: center; }
.modal header h3 { margin: 0; font-size: 14px; }
.modal .body { padding: 16px 18px; display: flex; flex-direction: column; gap: 12px; }
.modal .foot { padding: 12px 18px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 8px; }
.form-row { display: flex; flex-direction: column; gap: 6px; }
.form-row label { font-size: 12px; color: var(--muted); }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.hint { font-size: 11px; color: var(--muted); }

.toast {
  position: fixed;
  top: 18px;
  left: 50%;
  transform: translateX(-50%);
  background: #1f2937;
  color: #fff;
  padding: 9px 16px;
  border-radius: 8px;
  font-size: 13px;
  opacity: 0;
  transition: opacity 0.2s;
  z-index: 100;
  pointer-events: none;
}
.toast.show { opacity: 1; }
.toast.error { background: var(--danger); }

.image-viewer img { max-width: 100%; border-radius: 8px; }

@media (max-width: 900px) {
  .sidebar { display: none; }
  .form-grid { grid-template-columns: 1fr; }
}