:root {
    --brand: #72DD77;
    --brand-dark: #4fb955;
    --bg: #f5f7f6;
    --surface: #ffffff;
    --text: #1c2321;
    --text-muted: #6b7570;
    --border: #e4e8e6;
    --danger: #e2574c;
    --radius: 10px;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.06), 0 1px 2px rgba(0, 0, 0, 0.04);
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background: var(--bg);
    color: var(--text);
}

a { color: inherit; }

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

.sidebar {
    width: 230px;
    background: var(--surface);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 20px 0;
    flex-shrink: 0;
}

.sidebar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 0 20px 20px;
    font-weight: 700;
    font-size: 18px;
}

.sidebar-brand .dot {
    width: 10px; height: 10px; border-radius: 50%;
    background: var(--brand);
}

.sidebar nav { display: flex; flex-direction: column; gap: 2px; padding: 0 12px; }

.sidebar nav a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius);
    text-decoration: none;
    color: var(--text-muted);
    font-size: 14px;
    font-weight: 500;
}

.sidebar nav a:hover { background: var(--bg); color: var(--text); }
.sidebar nav a.active { background: rgba(114, 221, 119, 0.18); color: var(--brand-dark); }
.sidebar nav a svg { width: 18px; height: 18px; }

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

.topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.topbar h1 { font-size: 22px; margin: 0; }

.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 20px;
}

.grid { display: grid; gap: 16px; }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

@media (max-width: 900px) {
    .grid-4, .grid-3, .grid-2 { grid-template-columns: 1fr 1fr; }
    .sidebar { display: none; }
}

.stat-card { display: flex; flex-direction: column; gap: 6px; }
.stat-card .value { font-size: 28px; font-weight: 700; }
.stat-card .label { color: var(--text-muted); font-size: 13px; }

table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); }
th { color: var(--text-muted); font-weight: 600; font-size: 12px; text-transform: uppercase; letter-spacing: .03em; }

.badge {
    display: inline-flex; align-items: center; gap: 5px;
    padding: 3px 10px; border-radius: 999px; font-size: 12px; font-weight: 600;
}
.badge.online { background: rgba(114,221,119,0.18); color: var(--brand-dark); }
.badge.offline { background: #f1f1f1; color: var(--text-muted); }
.badge.never { background: #fff3e0; color: #b06a00; }

.btn {
    display: inline-flex; align-items: center; gap: 8px;
    padding: 9px 16px; border-radius: var(--radius);
    border: 1px solid var(--border); background: var(--surface);
    font-size: 14px; font-weight: 600; cursor: pointer; text-decoration: none; color: var(--text);
}
.btn-primary { background: var(--brand); border-color: var(--brand); color: #10321a; }
.btn-primary:hover { background: var(--brand-dark); }
.btn-danger { color: var(--danger); border-color: rgba(226,87,76,0.3); }
.btn:hover { filter: brightness(0.98); }

.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-size: 13px; font-weight: 600; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: var(--radius);
    font-size: 14px; font-family: inherit; background: var(--surface); color: var(--text);
}
.form-group textarea { min-height: 100px; resize: vertical; }

.alert { padding: 12px 16px; border-radius: var(--radius); font-size: 14px; margin-bottom: 16px; }
.alert-error { background: #fdecea; color: #b3261e; border: 1px solid #f6c6c1; }
.alert-info { background: rgba(114,221,119,0.15); color: var(--brand-dark); border: 1px solid rgba(114,221,119,0.4); }

.token-box {
    background: #10321a; color: #d5f7d8; padding: 16px; border-radius: var(--radius);
    font-family: ui-monospace, SFMono-Regular, Menlo, monospace; font-size: 13px; word-break: break-all;
}

.empty-state { text-align: center; padding: 48px 20px; color: var(--text-muted); }

.login-page {
    min-height: 100vh; display: flex; align-items: center; justify-content: center; background: var(--bg);
}
.login-card { width: 100%; max-width: 380px; background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 32px; box-shadow: var(--shadow); }
.login-card h1 { font-size: 20px; margin-bottom: 4px; }
.login-card p { color: var(--text-muted); font-size: 14px; margin-top: 0; margin-bottom: 24px; }