:root {
  --bg: #f4f5f7;
  --surface: #ffffff;
  --border: #e5e7eb;
  --text: #1f2430;
  --text-muted: #6b7280;
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --primary-soft: #eef2ff;
  --success: #059669;
  --success-soft: #ecfdf5;
  --danger: #dc2626;
  --danger-soft: #fef2f2;
  --warning: #d97706;
  --radius: 12px;
  --sidebar-w: 240px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, "Segoe UI", "Noto Sans Thai", "Sarabun", sans-serif;
  background: var(--bg);
  color: var(--text);
  font-size: 14.5px;
  line-height: 1.55;
}

a { color: inherit; text-decoration: none; }

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

/* ---------- Sidebar ---------- */
.sidebar {
  width: var(--sidebar-w);
  background: #17182b;
  color: #cbd0e6;
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  position: sticky;
  top: 0;
  height: 100vh;
}
.sidebar-brand {
  padding: 22px 20px;
  font-weight: 700;
  font-size: 16px;
  color: #fff;
  display: flex;
  gap: 8px;
  align-items: center;
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.sidebar-nav { flex: 1; padding: 14px 10px; display: flex; flex-direction: column; gap: 2px; }
.sidebar-nav a {
  padding: 10px 14px;
  border-radius: 8px;
  font-size: 14px;
  color: #b7bcd6;
  transition: background 0.15s, color 0.15s;
}
.sidebar-nav a:hover { background: rgba(255,255,255,0.06); color: #fff; }
.sidebar-nav a.active { background: var(--primary); color: #fff; }
.sidebar-user {
  padding: 16px 20px 20px;
  border-top: 1px solid rgba(255,255,255,0.08);
}
.sidebar-user-name { color: #fff; font-weight: 600; font-size: 13.5px; }
.sidebar-user-role { color: #8b90ab; font-size: 12px; margin-top: 2px; }
.logout-link { display: inline-block; margin-top: 10px; font-size: 12.5px; color: #f87171; }

/* ---------- Main ---------- */
.main-content { flex: 1; padding: 28px 32px; max-width: 1200px; }

.page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 22px; flex-wrap: wrap; gap: 12px; }
.page-header h1 { font-size: 21px; margin: 0 0 4px; }
.page-header p { margin: 0; color: var(--text-muted); font-size: 13.5px; }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px 22px;
  margin-bottom: 20px;
}

.grid { display: grid; gap: 18px; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
@media (max-width: 900px) { .grid-4 { grid-template-columns: repeat(2, 1fr); } .grid-2 { grid-template-columns: 1fr; } }

.stat-card { display: flex; flex-direction: column; gap: 6px; }
.stat-card .label { color: var(--text-muted); font-size: 13px; }
.stat-card .value { font-size: 26px; font-weight: 700; }
.stat-card .value.primary { color: var(--primary); }
.stat-card .value.success { color: var(--success); }
.stat-card .value.warning { color: var(--warning); }

table { width: 100%; border-collapse: collapse; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); font-size: 13.5px; vertical-align: middle; }
th { color: var(--text-muted); font-weight: 600; font-size: 12.5px; text-transform: uppercase; letter-spacing: 0.02em; }
tr:last-child td { border-bottom: none; }

.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 9px 16px;
  border-radius: 8px;
  border: 1px solid transparent;
  background: var(--primary);
  color: #fff;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
}
.btn:hover { background: var(--primary-dark); }
.btn.secondary { background: var(--surface); border-color: var(--border); color: var(--text); }
.btn.secondary:hover { background: #f3f4f6; }
.btn.danger { background: var(--danger); }
.btn.danger:hover { background: #b91c1c; }
.btn.small { padding: 6px 11px; font-size: 12.5px; }

.badge { display: inline-flex; padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 600; }

input[type=text], input[type=password], input[type=number], select, textarea {
  width: 100%;
  padding: 9px 12px;
  border: 1px solid var(--border);
  border-radius: 8px;
  font-size: 13.5px;
  font-family: inherit;
  background: var(--surface);
  color: var(--text);
}
textarea { resize: vertical; min-height: 70px; }
label { display: block; font-size: 13px; font-weight: 600; margin-bottom: 6px; color: #374151; }
.field { margin-bottom: 16px; }

.alert { padding: 12px 16px; border-radius: 8px; font-size: 13.5px; margin-bottom: 16px; }
.alert.success { background: var(--success-soft); color: var(--success); }
.alert.danger { background: var(--danger-soft); color: var(--danger); }
.alert.info { background: var(--primary-soft); color: var(--primary-dark); }

.empty-state { text-align: center; padding: 40px 20px; color: var(--text-muted); }

/* login page */
.login-wrap { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: var(--bg); }
.login-box { width: 360px; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px; }
.login-box h1 { font-size: 18px; margin: 0 0 4px; }
.login-box p { color: var(--text-muted); font-size: 13px; margin: 0 0 22px; }

/* keyword workflow rows */
.reply-row { display: flex; gap: 10px; align-items: flex-start; margin-bottom: 10px; }
.reply-row .occ-tag { flex-shrink: 0; width: 90px; padding-top: 9px; font-size: 12.5px; color: var(--text-muted); }

/* inbox layout */
.inbox-layout { display: grid; grid-template-columns: 300px 1fr; gap: 0; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--surface); min-height: 560px; }
.inbox-list { border-right: 1px solid var(--border); overflow-y: auto; max-height: 640px; }
.inbox-list a { display: block; padding: 12px 16px; border-bottom: 1px solid var(--border); }
.inbox-list a:hover, .inbox-list a.active { background: var(--primary-soft); }
.inbox-list .cname { font-weight: 600; font-size: 13.5px; }
.inbox-list .cpreview { font-size: 12px; color: var(--text-muted); margin-top: 2px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.chat-panel { display: flex; flex-direction: column; height: 100%; }
.chat-header { padding: 14px 20px; border-bottom: 1px solid var(--border); font-weight: 600; }
.chat-messages { flex: 1; padding: 20px; overflow-y: auto; max-height: 500px; display: flex; flex-direction: column; gap: 10px; }
.msg { max-width: 65%; padding: 9px 13px; border-radius: 14px; font-size: 13.5px; }
.msg.in { align-self: flex-start; background: #f3f4f6; }
.msg.out { align-self: flex-end; background: var(--primary); color: #fff; }
.msg.auto { align-self: flex-end; background: var(--success-soft); color: var(--success); border: 1px dashed var(--success); }
.msg-time { font-size: 10.5px; color: var(--text-muted); margin-top: 3px; }
.chat-input { display: flex; gap: 10px; padding: 14px; border-top: 1px solid var(--border); }
.chat-input textarea { flex: 1; min-height: 44px; }

.text-muted { color: var(--text-muted); }
.mt-0 { margin-top: 0; }