:root {
    --primary: #0d6efd;
    --primary-dark: #0a58ca;
    --bg-light: #f3f6f9;
    --text-dark: #2c3e50;
    --radius: 12px;
}

body {
    background-color: var(--bg-light);
    font-family: 'Poppins', sans-serif;
    color: var(--text-dark);
}

.card {
    border: none;
    border-radius: var(--radius);
    box-shadow: 0 4px 15px rgba(0,0,0,0.05);
    transition: transform 0.2s;
}

.btn-primary {
    background-color: var(--primary);
    border: none;
    border-radius: 8px;
    padding: 10px 20px;
    font-weight: 600;
}

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

.form-control {
    border-radius: 8px;
    padding: 12px;
    border: 1px solid #e0e0e0;
}

.form-control:focus {
    box-shadow: 0 0 0 3px rgba(13, 110, 253, 0.15);
    border-color: var(--primary);
}

/* Header Logic */
.app-header {
    background: white;
    padding: 15px 0;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    margin-bottom: 30px;
}

.logo-img {
    max-height: 50px;
}

/* Mobile Optimizations */
.timer-sticky {
    position: sticky;
    top: 0;
    z-index: 1000;
    background: var(--primary);
    color: white;
    padding: 10px;
    text-align: center;
    border-bottom-left-radius: 15px;
    border-bottom-right-radius: 15px;
    font-weight: bold;
    box-shadow: 0 4px 10px rgba(13, 110, 253, 0.3);
}

.status-badge {
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}