:root {
    --bg: #0f1117;
    --surface: #1a1d27;
    --surface2: #252836;
    --border: #2e3142;
    --text: #e4e4e7;
    --text-muted: #9194a1;
    --primary: #6c63ff;
    --primary-hover: #5a52e0;
    --danger: #ef4444;
    --success: #22c55e;
    --warning: #f59e0b;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
}

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

/* Nav */
.nav {
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 0.75rem 1.5rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    flex-shrink: 0;
}
.nav-logo {
    width: 36px;
    height: 22px;
    flex-shrink: 0;
}
.nav-title {
    font-size: 1.1rem;
    font-weight: 600;
}
.nav-credit {
    font-size: 0.65rem;
    color: var(--text-muted);
    letter-spacing: 0.03em;
}
.nav-title-row .nav-title::after {
    content: "";
    display: inline-block;
    width: 2.5rem;
}
.nav-title-row {
    display: flex;
    align-items: baseline;
    gap: 0;
}
.nav-links { display: flex; gap: 1rem; align-items: center; }
.nav-links a {
    color: var(--text-muted);
    font-size: 0.9rem;
    padding: 0.4rem 0.8rem;
    border-radius: 6px;
    transition: all 0.2s;
}
.nav-links a:hover {
    color: var(--text);
    background: var(--surface2);
    text-decoration: none;
}
.nav-user {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Layout */
.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}
.container-wide {
    max-width: 1100px;
    margin: 0 auto;
    padding: 2rem 1.5rem;
}

/* Cards */
.card {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}
.card-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}
.card-desc {
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 1.25rem;
    font-style: italic;
}

/* Forms */
.form-group {
    margin-bottom: 1rem;
}
.form-group label {
    display: block;
    font-size: 0.85rem;
    font-weight: 500;
    margin-bottom: 0.35rem;
    color: var(--text);
}
.form-group .hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.3rem;
}
input[type="text"],
input[type="password"],
input[type="number"],
input[type="date"],
select,
textarea {
    width: 100%;
    padding: 0.6rem 0.8rem;
    background: var(--surface2);
    border: 1px solid var(--border);
    border-radius: 8px;
    color: var(--text);
    font-size: 0.9rem;
    transition: border-color 0.2s;
}
input:focus, select:focus, textarea:focus {
    outline: none;
    border-color: var(--primary);
}
textarea { resize: vertical; min-height: 70px; }

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.6rem 1.2rem;
    border: none;
    border-radius: 8px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s;
    text-align: center;
}
.btn-primary {
    background: var(--primary);
    color: white;
}
.btn-primary:hover { background: var(--primary-hover); }
.btn-danger {
    background: var(--danger);
    color: white;
}
.btn-danger:hover { opacity: 0.85; }
.btn-sm {
    padding: 0.35rem 0.7rem;
    font-size: 0.8rem;
}
.btn-outline {
    background: transparent;
    border: 1px solid var(--border);
    color: var(--text-muted);
}
.btn-outline:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* Alerts */
.alert {
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-bottom: 1rem;
    font-size: 0.9rem;
}
.alert-success {
    background: rgba(34, 197, 94, 0.15);
    border: 1px solid rgba(34, 197, 94, 0.3);
    color: var(--success);
}
.alert-error {
    background: rgba(239, 68, 68, 0.15);
    border: 1px solid rgba(239, 68, 68, 0.3);
    color: var(--danger);
}

/* Login */
.login-wrapper {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    padding: 1rem;
}
.login-card {
    width: 100%;
    max-width: 380px;
}
.login-card h1 {
    text-align: center;
    margin-bottom: 0.5rem;
    font-size: 1.5rem;
}
.login-card .subtitle {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
}

/* Table */
.table-wrap { overflow-x: auto; }
table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.85rem;
}
th, td {
    padding: 0.6rem 0.8rem;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
th {
    background: var(--surface2);
    font-weight: 600;
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.03em;
    color: var(--text-muted);
}
tr:hover { background: var(--surface2); }

.badge {
    display: inline-block;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-size: 0.75rem;
    font-weight: 500;
}
.badge-active { background: rgba(34,197,94,0.15); color: var(--success); }
.badge-inactive { background: rgba(239,68,68,0.15); color: var(--danger); }
.badge-admin { background: rgba(108,99,255,0.15); color: var(--primary); }

/* Section divider */
.section-title {
    font-size: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border);
}

/* History cards */
.checkin-entry {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 1.25rem;
    margin-bottom: 1rem;
}
.checkin-date {
    font-weight: 600;
    font-size: 1rem;
    margin-bottom: 0.75rem;
    color: var(--primary);
}
.checkin-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 0.5rem;
}
.checkin-field {
    font-size: 0.82rem;
}
.checkin-field .label {
    color: var(--text-muted);
}
.checkin-field .value {
    font-weight: 500;
}

/* Charts */
.chart-container {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.25rem;
    margin-bottom: 1.5rem;
}

/* Responsive */
@media (max-width: 768px) {
    .form-row { grid-template-columns: 1fr; }
    .container { padding: 1rem; }
    .container-wide { padding: 1rem; }
    .nav {
        padding: 0.5rem 1rem;
        flex-direction: column;
        gap: 0.5rem;
    }
    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.4rem;
    }
    .nav-links a {
        font-size: 0.8rem;
        padding: 0.3rem 0.6rem;
    }
    .nav-user { font-size: 0.75rem; }
    .card { padding: 1rem; }
    .checkin-grid {
        grid-template-columns: 1fr 1fr;
    }
    table { font-size: 0.75rem; }
    th, td { padding: 0.4rem 0.5rem; }
}

@media (max-width: 480px) {
    .checkin-grid { grid-template-columns: 1fr; }
    .nav-title { font-size: 0.95rem; }
}

/* Modal */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.6);
    z-index: 100;
    align-items: center;
    justify-content: center;
}
.modal-overlay.active { display: flex; }
.modal {
    background: var(--surface);
    border: 1px solid var(--border);
    border-radius: 12px;
    padding: 1.5rem;
    width: 90%;
    max-width: 400px;
}
.modal h3 { margin-bottom: 1rem; }
.modal .actions {
    display: flex;
    gap: 0.5rem;
    justify-content: flex-end;
    margin-top: 1rem;
}