:root {
    --primary: #2f5d8a;
    --primary-dark: #204268;
    --bg: #f4f6f9;
    --sidebar-bg: #1c2b3a;
    --sidebar-text: #c9d6e3;
    --border: #e0e4ea;
    --success: #2e7d32;
    --danger: #c62828;
    --warning: #b26a00;
    --radius: 8px;
}
* { box-sizing: border-box; }
body {
    margin: 0;
    font-family: 'Segoe UI', Roboto, Arial, sans-serif;
    background: var(--bg);
    color: #1e2733;
}

/* ---------- Login page ---------- */
.login-body {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}
.login-card {
    background: #fff;
    padding: 40px 36px;
    border-radius: var(--radius);
    width: 340px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
}
.login-card h1 { margin: 0; color: var(--primary); letter-spacing: 1px; }
.login-card .subtitle { color: #6b7684; margin-top: 2px; margin-bottom: 20px; }
.login-card label { display: block; margin-top: 14px; margin-bottom: 4px; font-size: 14px; color: #444; }
.login-card input {
    width: 100%; padding: 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px;
}
.login-card .hint { font-size: 12px; color: #8a93a0; margin-top: 20px; text-align: center; }

/* ---------- App shell ---------- */
.app-shell { display: flex; min-height: 100vh; }
.sidebar {
    width: 220px;
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    flex-shrink: 0;
    padding: 20px 0;
}
.sidebar-brand {
    font-size: 20px; font-weight: 700; color: #fff;
    padding: 0 20px 20px; letter-spacing: 1px;
    border-bottom: 1px solid rgba(255,255,255,0.1); margin-bottom: 10px;
}
.sidebar nav a {
    display: block; padding: 10px 20px; color: var(--sidebar-text);
    text-decoration: none; font-size: 14px;
}
.sidebar nav a:hover, .sidebar nav a.active {
    background: rgba(255,255,255,0.08); color: #fff; border-left: 3px solid var(--primary);
}
.main-area { flex: 1; display: flex; flex-direction: column; min-width: 0; }
.topbar {
    background: #fff; padding: 14px 24px; display: flex; justify-content: space-between;
    align-items: center; border-bottom: 1px solid var(--border);
}
.topbar h2 { margin: 0; font-size: 18px; }
.topbar-user { display: flex; gap: 12px; align-items: center; font-size: 14px; color: #555; }
.content { padding: 24px; }

/* ---------- Widgets ---------- */
.stat-cards { display: flex; gap: 16px; flex-wrap: wrap; margin-bottom: 24px; }
.stat-card {
    background: #fff; border-radius: var(--radius); padding: 18px 20px; min-width: 160px;
    border: 1px solid var(--border);
}
.stat-card .stat-value { font-size: 26px; font-weight: 700; color: var(--primary); }
.stat-card .stat-label { font-size: 13px; color: #6b7684; margin-top: 4px; }

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

table { width: 100%; border-collapse: collapse; background: #fff; }
table th, table td { text-align: left; padding: 10px 12px; border-bottom: 1px solid var(--border); font-size: 14px; }
table th { background: #f0f3f7; font-weight: 600; }
table tr:hover td { background: #fafbfc; }

.btn {
    display: inline-block; padding: 9px 16px; border-radius: 6px; border: none; cursor: pointer;
    font-size: 14px; text-decoration: none; text-align: center;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-small { padding: 5px 10px; font-size: 12px; background: #e5e9ef; color: #333; }
.btn-danger { background: var(--danger); color: #fff; }
.btn-block { width: 100%; margin-top: 20px; }

.alert { padding: 10px 14px; border-radius: 6px; margin-bottom: 14px; font-size: 14px; }
.alert-error { background: #fdecea; color: var(--danger); }
.alert-success { background: #eaf7ec; color: var(--success); }

.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-grid .full { grid-column: 1 / -1; }
.form-group label { display: block; font-size: 13px; margin-bottom: 4px; color: #444; }
.form-group input, .form-group select, .form-group textarea {
    width: 100%; padding: 8px 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px;
}
.badge { padding: 3px 8px; border-radius: 10px; font-size: 12px; }
.badge-active, .badge-present, .badge-paid { background: #e6f4ea; color: var(--success); }
.badge-inactive, .badge-absent, .badge-unpaid { background: #fdecea; color: var(--danger); }