:root {
    --bg-primary: #f8fafc;
    --text-main: #1e293b;
    --text-muted: #64748b;
    --card-bg: #ffffff;
    --accent: #4f46e5;
    --accent-hover: #4338ca;
    --danger: #ef4444;
    --danger-hover: #dc2626;
    --success: #10b981;
    --success-hover: #059669;
}

body {
    background-color: var(--bg-primary);
    color: var(--text-main);
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
}

.card {
    background-color: var(--card-bg);
    border-radius: 12px;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    padding: 24px;
    margin-bottom: 24px;
}

.text-center { text-align: center; }
.mt-4 { margin-top: 1.5rem; }
.mb-4 { margin-bottom: 1.5rem; }
.text-muted { color: var(--text-muted); font-size: 0.9rem; }

h1, h2, h3 { margin-top: 0; }
.title { font-weight: 700; color: var(--text-main); }

.form-group { margin-bottom: 1rem; }
.form-label { display: block; margin-bottom: 0.5rem; font-weight: 500; font-size: 0.9rem; }
.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid #cbd5e1;
    border-radius: 8px;
    font-size: 1rem;
    box-sizing: border-box;
    transition: border-color 0.2s;
}
.form-control:focus { border-color: var(--accent); outline: none; }

.btn {
    display: inline-block;
    width: 100%;
    padding: 1rem;
    font-size: 1.1rem;
    font-weight: 600;
    text-align: center;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.2s, transform 0.1s;
    box-sizing: border-box;
    text-decoration: none;
}
.btn:active { transform: translateY(2px); }

.btn-primary { background-color: var(--accent); color: white; }
.btn-primary:hover { background-color: var(--accent-hover); }

.btn-success { background-color: var(--success); color: white; }
.btn-success:hover { background-color: var(--success-hover); }

.btn-danger { background-color: var(--danger); color: white; }
.btn-danger:hover { background-color: var(--danger-hover); }

.status-badge {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 9999px;
    font-size: 0.875rem;
    font-weight: 500;
}
.status-active { background-color: #d1fae5; color: #065f46; }
.status-inactive { background-color: #f1f5f9; color: #475569; }

/* Giant Checkin buttons for mobile ease */
.btn-gigantic {
    padding: 1.5rem;
    font-size: 1.5rem;
    margin: 20px 0;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

@keyframes pulse-border {
    0% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(34, 197, 94, 0); }
    100% { box-shadow: 0 0 0 0 rgba(34, 197, 94, 0); }
}

.whatsapp-box {
    background-color: #f0fdf4;
    border: 3px dashed #22c55e;
    padding: 25px;
    border-radius: 12px;
    margin-top: 25px;
    text-align: center;
    animation: pulse-border 2s infinite;
}
.whatsapp-box a { color: white; font-weight: bold; text-decoration: none; }

.history-item {
    display: flex;
    justify-content: space-between;
    padding: 10px 0;
    border-bottom: 1px solid #f1f5f9;
}
.history-item:last-child { border-bottom: none; }