* { box-sizing: border-box; }
body {
    font-family: -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
    background: #f4f6f9;
    margin: 0;
    color: #1f2937;
}
.navbar {
    background: #111827;
    color: #fff;
    padding: 14px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.nav-brand { font-weight: 600; }
.nav-links a {
    color: #d1d5db;
    text-decoration: none;
    margin-left: 18px;
    font-size: 14px;
}
.nav-links a:hover { color: #fff; }
.container { max-width: 1100px; margin: 24px auto; padding: 0 20px; }
h1 { margin-bottom: 16px; }
.cards { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 24px; }
.card {
    background: #fff; border-radius: 10px; padding: 20px; flex: 1;
    min-width: 160px; box-shadow: 0 1px 3px rgba(0,0,0,0.08);
    text-align: center;
}
.card h3 { margin: 0 0 6px; font-size: 28px; color: #2563eb; }
.card p { margin: 0; color: #6b7280; font-size: 13px; }
.table { width: 100%; border-collapse: collapse; background: #fff; border-radius: 8px; overflow: hidden; }
.table th, .table td { text-align: left; padding: 10px 14px; border-bottom: 1px solid #e5e7eb; font-size: 14px; }
.table th { background: #f9fafb; }
.badge-active { color: #059669; font-weight: 600; }
.badge-inactive { color: #d97706; font-weight: 600; }
.auth-box {
    max-width: 360px; margin: 100px auto; background: #fff; padding: 32px;
    border-radius: 10px; box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
.auth-box h2 { margin-top: 0; }
.auth-box label { display: block; margin-top: 12px; font-size: 13px; color: #4b5563; }
.auth-box input, .settings-form input, .settings-form textarea {
    width: 100%; padding: 9px; margin-top: 4px; border: 1px solid #d1d5db; border-radius: 6px;
}
.auth-box button, .settings-form button, .chat-form button {
    margin-top: 18px; width: 100%; padding: 10px; background: #2563eb; color: #fff;
    border: none; border-radius: 6px; cursor: pointer; font-size: 14px;
}
.error { color: #dc2626; }
.success { color: #059669; }
.tabs { display: flex; gap: 4px; margin-bottom: 16px; }
.tab {
    padding: 8px 16px; text-decoration: none; color: #4b5563;
    background: #e5e7eb; border-radius: 6px 6px 0 0; font-size: 14px;
}
.tab.active { background: #2563eb; color: #fff; }
.settings-form { background: #fff; padding: 20px; border-radius: 0 8px 8px 8px; max-width: 500px; }
.settings-form label { display: block; margin-top: 12px; font-size: 13px; color: #4b5563; }
.settings-form button { width: auto; padding: 10px 24px; }
.info-box { margin-top: 20px; background: #eff6ff; border-left: 4px solid #2563eb; padding: 14px 18px; font-size: 13px; border-radius: 0 6px 6px 0; }
.info-box code { background: #dbeafe; padding: 2px 6px; border-radius: 4px; }
.inbox-layout { display: flex; gap: 16px; height: 550px; }
.contact-list { width: 280px; background: #fff; border-radius: 8px; overflow-y: auto; }
.contact-item { display: block; padding: 12px 16px; text-decoration: none; color: #1f2937; border-bottom: 1px solid #f3f4f6; position: relative; }
.contact-item.active { background: #eff6ff; }
.contact-item .tag { display: block; font-size: 11px; color: #6b7280; margin-top: 2px; }
.badge-count { position: absolute; right: 14px; top: 14px; background: #dc2626; color: #fff; font-size: 11px; padding: 2px 7px; border-radius: 10px; }
.chat-panel { flex: 1; background: #fff; border-radius: 8px; display: flex; flex-direction: column; padding: 16px; }
.chat-messages { flex: 1; overflow-y: auto; display: flex; flex-direction: column; gap: 8px; }
.bubble { max-width: 65%; padding: 8px 12px; border-radius: 10px; font-size: 14px; }
.bubble.in { background: #f3f4f6; align-self: flex-start; }
.bubble.out { background: #2563eb; color: #fff; align-self: flex-end; }
.bubble small { display: block; font-size: 10px; opacity: 0.6; margin-top: 4px; }
.chat-form { display: flex; gap: 8px; margin-top: 12px; }
.chat-form input { flex: 1; padding: 10px; border: 1px solid #d1d5db; border-radius: 6px; }
.chat-form button { margin-top: 0; width: auto; padding: 10px 20px; }
.muted { color: #9ca3af; padding: 16px; }