:root {
    --page-bg: #f7f8fa;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --action-color: #3b82f6;
    --avatar-bg: #eef2ff;
    --avatar-icon-color: #6366f1;
    --radius: 12px;
    --radius-lg: 16px;
}

body {
    background-color: var(--page-bg);
    color: var(--text-primary);
}

.student-list-container {
    max-width: 600px;
    margin: 0 auto;
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.list-header h2 {
    font-size: 16px;
    font-weight: 500;
    color: var(--text-secondary);
    margin: 0;
}

.student-card {
    background-color: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 16px;
    display: flex;
    flex-direction: column;
    gap: 12px;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.04);
}

.student-card:hover {
    border-color: var(--action-color);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.12);
}

.student-card:active {
    transform: translateY(0);
}

.card-header {
    display: flex;
    align-items: center;
    gap: 14px;
}

.card-avatar {
    width: 44px;
    height: 44px;
    border-radius: var(--radius);
    background-color: var(--avatar-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.card-avatar svg {
    width: 22px;
    height: 22px;
    color: var(--avatar-icon-color);
}

.card-info {
    flex: 1;
    min-width: 0;
}

.student-name {
    font-size: 15px;
    font-weight: 700;
    text-transform: uppercase;
    color: var(--text-primary);
    margin: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.student-ra {
    font-size: 13px;
    color: var(--text-secondary);
    margin: 4px 0 0 0;
}

.card-expand-icon {
    color: var(--text-secondary);
    flex-shrink: 0;
}

.card-expand-icon svg {
    width: 20px;
    height: 20px;
}

.card-action-button {
    width: 100%;
    padding: 12px;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    background-color: transparent;
    color: var(--action-color);
    font-size: 14px;
    font-weight: 600;
    text-align: center;
    transition: all 0.2s ease-in-out;
}

.student-card:hover .card-action-button {
    background-color: var(--action-color);
    color: white;
    border-color: var(--action-color);
}

@media (max-width: 600px) {
    .student-list-container {
        padding: 12px;
        gap: 12px;
    }
    
    .student-card {
        padding: 14px;
    }
    
    .card-avatar {
        width: 40px;
        height: 40px;
    }
    
    .card-avatar svg {
        width: 20px;
        height: 20px;
    }
    
    .student-name {
        font-size: 14px;
    }
    
    .student-ra {
        font-size: 12px;
    }
    
    .card-action-button {
        padding: 10px;
        font-size: 13px;
    }
}